This series cleans up the zyqnmp_dp IRQ and locking situation. Once
that's done, it adds debugfs support. The intent is to enable compliance
testing or to help debug signal-integrity issues.
Last time I discussed converting the HPD work(s) to a threaded IRQ. I
did not end up doing that for this series since the steps would be
- Add locking
- Move link retraining to a work function
- Harden the IRQ
- Merge the works into a threaded IRQ (omitted)
Which with the exception of the final step is the same as leaving those
works as-is. Conversion to a threaded IRQ can be done as a follow-up.
Changes in v3:
- Store base pointers in zynqmp_disp directly
- Don't delay work
- Convert to a hard IRQ
- Use AUX IRQs instead of polling
- Take dp->lock in zynqmp_dp_hpd_work_func
Changes in v2:
- Fix kerneldoc
- Rearrange zynqmp_dp for better padding
- Split off the HPD IRQ work into another commit
- Expand the commit message
- Document hpd_irq_work
- Document debugfs files
- Add ignore_aux_errors and ignore_hpd debugfs files to replace earlier
implicit functionality
- Attempt to fix unreproducable, spurious build warning
- Drop "Optionally ignore DPCD errors" in favor of a debugfs file
directly affecting zynqmp_dp_aux_transfer.
Sean Anderson (13):
drm: xlnx: Store base pointers in zynqmp_disp directly
drm: xlnx: Fix kerneldoc
drm: zynqmp_dp: Downgrade log level for aux retries message
drm: zynqmp_dp: Adjust training values per-lane
drm: zynqmp_dp: Rearrange zynqmp_dp for better padding
drm: zynqmp_dp: Don't delay work
drm: zynqmp_dp: Add locking
drm: zynqmp_dp: Don't retrain the link in our IRQ
drm: zynqmp_dp: Convert to a hard IRQ
drm: zynqmp_dp: Use AUX IRQs instead of polling
drm: zynqmp_dp: Split off several helper functions
drm: zynqmp_dp: Take dp->lock in zynqmp_dp_hpd_work_func
drm: zynqmp_dp: Add debugfs interface for compliance testing
Documentation/gpu/drivers.rst | 1 +
Documentation/gpu/zynqmp.rst | 149 +++++
MAINTAINERS | 1 +
drivers/gpu/drm/xlnx/zynqmp_disp.c | 44 +-
drivers/gpu/drm/xlnx/zynqmp_dp.c | 909 +++++++++++++++++++++++++---
drivers/gpu/drm/xlnx/zynqmp_dpsub.h | 1 +
drivers/gpu/drm/xlnx/zynqmp_kms.h | 4 +-
7 files changed, 1000 insertions(+), 109 deletions(-)
create mode 100644 Documentation/gpu/zynqmp.rst
--
2.35.1.1320.gc452695387.dirty
Fix a few errors in the kerneldoc. Mostly this addresses missing/renamed
members.
Signed-off-by: Sean Anderson <[email protected]>
---
Changes in v3:
- Split off documentation for base pointers to previous commit
Changes in v2:
- New
drivers/gpu/drm/xlnx/zynqmp_dpsub.h | 1 +
drivers/gpu/drm/xlnx/zynqmp_kms.h | 4 ++--
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dpsub.h b/drivers/gpu/drm/xlnx/zynqmp_dpsub.h
index 09ea01878f2a..b18554467e9c 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_dpsub.h
+++ b/drivers/gpu/drm/xlnx/zynqmp_dpsub.h
@@ -53,6 +53,7 @@ enum zynqmp_dpsub_format {
* @drm: The DRM/KMS device data
* @bridge: The DP encoder bridge
* @disp: The display controller
+ * @layers: Video and graphics layers
* @dp: The DisplayPort controller
* @dma_align: DMA alignment constraint (must be a power of 2)
*/
diff --git a/drivers/gpu/drm/xlnx/zynqmp_kms.h b/drivers/gpu/drm/xlnx/zynqmp_kms.h
index 01be96b00e3f..cb13c6b8008e 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_kms.h
+++ b/drivers/gpu/drm/xlnx/zynqmp_kms.h
@@ -22,9 +22,9 @@
struct zynqmp_dpsub;
/**
- * struct zynqmp_dpsub - ZynqMP DisplayPort Subsystem DRM/KMS data
+ * struct zynqmp_dpsub_drm - ZynqMP DisplayPort Subsystem DRM/KMS data
* @dpsub: Backpointer to the DisplayPort subsystem
- * @drm: The DRM/KMS device
+ * @dev: The DRM/KMS device
* @planes: The DRM planes
* @crtc: The DRM CRTC
* @encoder: The dummy DRM encoder
--
2.35.1.1320.gc452695387.dirty
Enable this message for verbose debugging only as it is otherwise
printed after every AUX message, quickly filling the log buffer.
Signed-off-by: Sean Anderson <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Reviewed-by: Tomi Valkeinen <[email protected]>
---
(no changes since v1)
drivers/gpu/drm/xlnx/zynqmp_dp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
index a0606fab0e22..98a32e6a0459 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
@@ -1006,7 +1006,7 @@ zynqmp_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
msg->buffer, msg->size,
&msg->reply);
if (!ret) {
- dev_dbg(dp->dev, "aux %d retries\n", i);
+ dev_vdbg(dp->dev, "aux %d retries\n", i);
return msg->size;
}
--
2.35.1.1320.gc452695387.dirty
The feedback we get from the DPRX is per-lane. Make changes using this
information, instead of picking the maximum values from all lanes. This
results in more-consistent training on marginal links.
Signed-off-by: Sean Anderson <[email protected]>
Reviewed-by: Tomi Valkeinen <[email protected]>
---
(no changes since v1)
drivers/gpu/drm/xlnx/zynqmp_dp.c | 23 ++++++++---------------
1 file changed, 8 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
index 98a32e6a0459..8635b5673386 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
@@ -605,28 +605,21 @@ static void zynqmp_dp_adjust_train(struct zynqmp_dp *dp,
u8 link_status[DP_LINK_STATUS_SIZE])
{
u8 *train_set = dp->train_set;
- u8 voltage = 0, preemphasis = 0;
u8 i;
for (i = 0; i < dp->mode.lane_cnt; i++) {
- u8 v = drm_dp_get_adjust_request_voltage(link_status, i);
- u8 p = drm_dp_get_adjust_request_pre_emphasis(link_status, i);
+ u8 voltage = drm_dp_get_adjust_request_voltage(link_status, i);
+ u8 preemphasis =
+ drm_dp_get_adjust_request_pre_emphasis(link_status, i);
- if (v > voltage)
- voltage = v;
+ if (voltage >= DP_TRAIN_VOLTAGE_SWING_LEVEL_3)
+ voltage |= DP_TRAIN_MAX_SWING_REACHED;
- if (p > preemphasis)
- preemphasis = p;
- }
+ if (preemphasis >= DP_TRAIN_PRE_EMPH_LEVEL_2)
+ preemphasis |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
- if (voltage >= DP_TRAIN_VOLTAGE_SWING_LEVEL_3)
- voltage |= DP_TRAIN_MAX_SWING_REACHED;
-
- if (preemphasis >= DP_TRAIN_PRE_EMPH_LEVEL_2)
- preemphasis |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
-
- for (i = 0; i < dp->mode.lane_cnt; i++)
train_set[i] = voltage | preemphasis;
+ }
}
/**
--
2.35.1.1320.gc452695387.dirty
Retraining the link can take a while, and might involve waiting for
DPCD reads/writes to complete. In preparation for unthreading the IRQ
handler, move this into its own work function.
Signed-off-by: Sean Anderson <[email protected]>
---
(no changes since v2)
Changes in v2:
- Document hpd_irq_work
- Split this off from the locking changes
drivers/gpu/drm/xlnx/zynqmp_dp.c | 45 ++++++++++++++++++++------------
1 file changed, 29 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
index 5eb926f050de..8ad8db01f136 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
@@ -288,6 +288,7 @@ struct zynqmp_dp_config {
* @phy: PHY handles for DP lanes
* @num_lanes: number of enabled phy lanes
* @hpd_work: hot plug detection worker
+ * @hpd_irq_work: hot plug detection IRQ worker
* @status: connection status
* @enabled: flag to indicate if the device is enabled
* @dpcd: DP configuration data from currently connected sink device
@@ -303,6 +304,7 @@ struct zynqmp_dp {
struct drm_dp_aux aux;
struct drm_bridge bridge;
struct work_struct hpd_work;
+ struct work_struct hpd_irq_work;
struct mutex lock;
struct drm_bridge *next_bridge;
@@ -1626,6 +1628,29 @@ static void zynqmp_dp_hpd_work_func(struct work_struct *work)
drm_bridge_hpd_notify(&dp->bridge, status);
}
+static void zynqmp_dp_hpd_irq_work_func(struct work_struct *work)
+{
+ struct zynqmp_dp *dp = container_of(work, struct zynqmp_dp,
+ hpd_irq_work);
+ u8 status[DP_LINK_STATUS_SIZE + 2];
+ int err;
+
+ mutex_lock(&dp->lock);
+ err = drm_dp_dpcd_read(&dp->aux, DP_SINK_COUNT, status,
+ DP_LINK_STATUS_SIZE + 2);
+ if (err < 0) {
+ dev_dbg_ratelimited(dp->dev,
+ "could not read sink status: %d\n", err);
+ } else {
+ if (status[4] & DP_LINK_STATUS_UPDATED ||
+ !drm_dp_clock_recovery_ok(&status[2], dp->mode.lane_cnt) ||
+ !drm_dp_channel_eq_ok(&status[2], dp->mode.lane_cnt)) {
+ zynqmp_dp_train_loop(dp);
+ }
+ }
+ mutex_unlock(&dp->lock);
+}
+
static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data)
{
struct zynqmp_dp *dp = (struct zynqmp_dp *)data;
@@ -1650,23 +1675,9 @@ static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data)
if (status & ZYNQMP_DP_INT_HPD_EVENT)
schedule_work(&dp->hpd_work);
- if (status & ZYNQMP_DP_INT_HPD_IRQ) {
- int ret;
- u8 status[DP_LINK_STATUS_SIZE + 2];
+ if (status & ZYNQMP_DP_INT_HPD_IRQ)
+ schedule_work(&dp->hpd_irq_work);
- ret = drm_dp_dpcd_read(&dp->aux, DP_SINK_COUNT, status,
- DP_LINK_STATUS_SIZE + 2);
- if (ret < 0)
- goto handled;
-
- if (status[4] & DP_LINK_STATUS_UPDATED ||
- !drm_dp_clock_recovery_ok(&status[2], dp->mode.lane_cnt) ||
- !drm_dp_channel_eq_ok(&status[2], dp->mode.lane_cnt)) {
- zynqmp_dp_train_loop(dp);
- }
- }
-
-handled:
return IRQ_HANDLED;
}
@@ -1692,6 +1703,7 @@ int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub)
mutex_init(&dp->lock);
INIT_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func);
+ INIT_WORK(&dp->hpd_irq_work, zynqmp_dp_hpd_irq_work_func);
/* Acquire all resources (IOMEM, IRQ and PHYs). */
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dp");
@@ -1791,6 +1803,7 @@ void zynqmp_dp_remove(struct zynqmp_dpsub *dpsub)
zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_ALL);
disable_irq(dp->irq);
+ cancel_work_sync(&dp->hpd_irq_work);
cancel_work_sync(&dp->hpd_work);
zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0);
--
2.35.1.1320.gc452695387.dirty
Instead of polling the status register for the AUX status, just enable
the IRQs and signal a completion.
Signed-off-by: Sean Anderson <[email protected]>
---
Changes in v3:
- New
drivers/gpu/drm/xlnx/zynqmp_dp.c | 35 +++++++++++++++++++++++---------
1 file changed, 25 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
index 3ecfebf35a72..3d90533aefd7 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
@@ -285,6 +285,7 @@ struct zynqmp_dp_config {
* @next_bridge: The downstream bridge
* @config: IP core configuration from DTS
* @aux: aux channel
+ * @aux_done: Completed when we get an AUX reply or timeout
* @phy: PHY handles for DP lanes
* @num_lanes: number of enabled phy lanes
* @hpd_work: hot plug detection worker
@@ -305,6 +306,7 @@ struct zynqmp_dp {
struct drm_bridge bridge;
struct work_struct hpd_work;
struct work_struct hpd_irq_work;
+ struct completion aux_done;
struct mutex lock;
struct drm_bridge *next_bridge;
@@ -941,12 +943,15 @@ static int zynqmp_dp_aux_cmd_submit(struct zynqmp_dp *dp, u32 cmd, u16 addr,
u8 *buf, u8 bytes, u8 *reply)
{
bool is_read = (cmd & AUX_READ_BIT) ? true : false;
+ unsigned long time_left;
u32 reg, i;
reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST)
return -EBUSY;
+ reinit_completion(&dp->aux_done);
+
zynqmp_dp_write(dp, ZYNQMP_DP_AUX_ADDRESS, addr);
if (!is_read)
for (i = 0; i < bytes; i++)
@@ -961,17 +966,14 @@ static int zynqmp_dp_aux_cmd_submit(struct zynqmp_dp *dp, u32 cmd, u16 addr,
zynqmp_dp_write(dp, ZYNQMP_DP_AUX_COMMAND, reg);
/* Wait for reply to be delivered upto 2ms */
- for (i = 0; ; i++) {
- reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
- if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY)
- break;
+ time_left = wait_for_completion_timeout(&dp->aux_done,
+ msecs_to_jiffies(2));
+ if (!time_left)
+ return -ETIMEDOUT;
- if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT ||
- i == 2)
- return -ETIMEDOUT;
-
- usleep_range(1000, 1100);
- }
+ reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
+ if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT)
+ return -ETIMEDOUT;
reg = zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_CODE);
if (reply)
@@ -1055,6 +1057,9 @@ static int zynqmp_dp_aux_init(struct zynqmp_dp *dp)
(w << ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT) |
(rate / (1000 * 1000)));
+ zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_REPLY_RECEIVED |
+ ZYNQMP_DP_INT_REPLY_TIMEOUT);
+
dp->aux.name = "ZynqMP DP AUX";
dp->aux.dev = dp->dev;
dp->aux.drm_dev = dp->bridge.dev;
@@ -1072,6 +1077,9 @@ static int zynqmp_dp_aux_init(struct zynqmp_dp *dp)
static void zynqmp_dp_aux_cleanup(struct zynqmp_dp *dp)
{
drm_dp_aux_unregister(&dp->aux);
+
+ zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_REPLY_RECEIVED |
+ ZYNQMP_DP_INT_REPLY_TIMEOUT);
}
/* -----------------------------------------------------------------------------
@@ -1678,6 +1686,12 @@ static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data)
if (status & ZYNQMP_DP_INT_HPD_IRQ)
schedule_work(&dp->hpd_irq_work);
+ if (status & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY)
+ complete(&dp->aux_done);
+
+ if (status & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT)
+ complete(&dp->aux_done);
+
return IRQ_HANDLED;
}
@@ -1701,6 +1715,7 @@ int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub)
dp->dpsub = dpsub;
dp->status = connector_status_disconnected;
mutex_init(&dp->lock);
+ init_completion(&dp->aux_done);
INIT_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func);
INIT_WORK(&dp->hpd_irq_work, zynqmp_dp_hpd_irq_work_func);
--
2.35.1.1320.gc452695387.dirty
We always call scheduled_delayed_work with no delay, so just use a
non-delayed work_struct instead.
Signed-off-by: Sean Anderson <[email protected]>
---
Changes in v3:
- New
drivers/gpu/drm/xlnx/zynqmp_dp.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
index f1834c8e3c02..59fed00a8f89 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
@@ -297,7 +297,7 @@ struct zynqmp_dp_config {
struct zynqmp_dp {
struct drm_dp_aux aux;
struct drm_bridge bridge;
- struct delayed_work hpd_work;
+ struct work_struct hpd_work;
struct drm_bridge *next_bridge;
struct device *dev;
@@ -1467,7 +1467,7 @@ static void zynqmp_dp_bridge_atomic_disable(struct drm_bridge *bridge,
struct zynqmp_dp *dp = bridge_to_dp(bridge);
dp->enabled = false;
- cancel_delayed_work(&dp->hpd_work);
+ cancel_work(&dp->hpd_work);
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 0);
drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D3);
zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN,
@@ -1603,8 +1603,7 @@ void zynqmp_dp_disable_vblank(struct zynqmp_dp *dp)
static void zynqmp_dp_hpd_work_func(struct work_struct *work)
{
- struct zynqmp_dp *dp = container_of(work, struct zynqmp_dp,
- hpd_work.work);
+ struct zynqmp_dp *dp = container_of(work, struct zynqmp_dp, hpd_work);
enum drm_connector_status status;
status = zynqmp_dp_bridge_detect(&dp->bridge);
@@ -1633,7 +1632,7 @@ static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data)
zynqmp_dpsub_drm_handle_vblank(dp->dpsub);
if (status & ZYNQMP_DP_INT_HPD_EVENT)
- schedule_delayed_work(&dp->hpd_work, 0);
+ schedule_work(&dp->hpd_work);
if (status & ZYNQMP_DP_INT_HPD_IRQ) {
int ret;
@@ -1675,7 +1674,7 @@ int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub)
dp->dpsub = dpsub;
dp->status = connector_status_disconnected;
- INIT_DELAYED_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func);
+ INIT_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func);
/* Acquire all resources (IOMEM, IRQ and PHYs). */
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dp");
@@ -1775,7 +1774,7 @@ void zynqmp_dp_remove(struct zynqmp_dpsub *dpsub)
zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_ALL);
disable_irq(dp->irq);
- cancel_delayed_work_sync(&dp->hpd_work);
+ cancel_work_sync(&dp->hpd_work);
zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0);
zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff);
--
2.35.1.1320.gc452695387.dirty
Now that all of the sleeping work is done outside of the IRQ, we can
convert it to a hard IRQ.
Signed-off-by: Sean Anderson <[email protected]>
---
Changes in v3:
- New
drivers/gpu/drm/xlnx/zynqmp_dp.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
index 8ad8db01f136..3ecfebf35a72 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
@@ -1774,9 +1774,8 @@ int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub)
* Now that the hardware is initialized and won't generate spurious
* interrupts, request the IRQ.
*/
- ret = devm_request_threaded_irq(dp->dev, dp->irq, NULL,
- zynqmp_dp_irq_handler, IRQF_ONESHOT,
- dev_name(dp->dev), dp);
+ ret = devm_request_irq(dp->dev, dp->irq, zynqmp_dp_irq_handler,
+ IRQF_SHARED, dev_name(dp->dev), dp);
if (ret < 0)
goto err_phy_exit;
--
2.35.1.1320.gc452695387.dirty
Add some locking to prevent the IRQ/workers/bridge API calls from stepping
on each other's toes. This lock protects:
- Non-atomic registers configuring the link. That is, everything but the
IRQ registers (since these are accessed in an atomic fashion), and the DP
AUX registers (since these don't affect the link). We also access AUX
while holding this lock, so it would be very tricky to support.
- Link configuration. This is effectively everything in zynqmp_dp which
isn't read-only after probe time. So from next_bridge onward.
This lock is designed to protect configuration changes so we don't have to
do anything tricky. Configuration should never be in the hot path, so I'm
not worried about performance.
Signed-off-by: Sean Anderson <[email protected]>
---
(no changes since v2)
Changes in v2:
- Split off the HPD IRQ work into another commit
- Expand the commit message
drivers/gpu/drm/xlnx/zynqmp_dp.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
index 59fed00a8f89..5eb926f050de 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
@@ -279,6 +279,7 @@ struct zynqmp_dp_config {
* @dpsub: Display subsystem
* @iomem: device I/O memory for register access
* @reset: reset controller
+ * @lock: Mutex protecting this struct and register access (but not AUX)
* @irq: irq
* @bridge: DRM bridge for the DP encoder
* @next_bridge: The downstream bridge
@@ -293,11 +294,16 @@ struct zynqmp_dp_config {
* @link_config: common link configuration between IP core and sink device
* @mode: current mode between IP core and sink device
* @train_set: set of training data
+ *
+ * @lock covers the link configuration in this struct and the device's
+ * registers. It does not cover @aux. It is not strictly required for any of
+ * the members which are only modified at probe/remove time (e.g. @dev).
*/
struct zynqmp_dp {
struct drm_dp_aux aux;
struct drm_bridge bridge;
struct work_struct hpd_work;
+ struct mutex lock;
struct drm_bridge *next_bridge;
struct device *dev;
@@ -1371,8 +1377,10 @@ zynqmp_dp_bridge_mode_valid(struct drm_bridge *bridge,
}
/* Check with link rate and lane count */
+ mutex_lock(&dp->lock);
rate = zynqmp_dp_max_rate(dp->link_config.max_rate,
dp->link_config.max_lanes, dp->config.bpp);
+ mutex_unlock(&dp->lock);
if (mode->clock > rate) {
dev_dbg(dp->dev, "filtered mode %s for high pixel rate\n",
mode->name);
@@ -1399,6 +1407,7 @@ static void zynqmp_dp_bridge_atomic_enable(struct drm_bridge *bridge,
pm_runtime_get_sync(dp->dev);
+ mutex_lock(&dp->lock);
zynqmp_dp_disp_enable(dp, old_bridge_state);
/*
@@ -1459,6 +1468,7 @@ static void zynqmp_dp_bridge_atomic_enable(struct drm_bridge *bridge,
zynqmp_dp_write(dp, ZYNQMP_DP_SOFTWARE_RESET,
ZYNQMP_DP_SOFTWARE_RESET_ALL);
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 1);
+ mutex_unlock(&dp->lock);
}
static void zynqmp_dp_bridge_atomic_disable(struct drm_bridge *bridge,
@@ -1466,6 +1476,7 @@ static void zynqmp_dp_bridge_atomic_disable(struct drm_bridge *bridge,
{
struct zynqmp_dp *dp = bridge_to_dp(bridge);
+ mutex_lock(&dp->lock);
dp->enabled = false;
cancel_work(&dp->hpd_work);
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 0);
@@ -1476,6 +1487,7 @@ static void zynqmp_dp_bridge_atomic_disable(struct drm_bridge *bridge,
zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 0);
zynqmp_dp_disp_disable(dp, old_bridge_state);
+ mutex_unlock(&dp->lock);
pm_runtime_put_sync(dp->dev);
}
@@ -1518,6 +1530,8 @@ static enum drm_connector_status zynqmp_dp_bridge_detect(struct drm_bridge *brid
u32 state, i;
int ret;
+ mutex_lock(&dp->lock);
+
/*
* This is from heuristic. It takes some delay (ex, 100 ~ 500 msec) to
* get the HPD signal with some monitors.
@@ -1545,11 +1559,13 @@ static enum drm_connector_status zynqmp_dp_bridge_detect(struct drm_bridge *brid
dp->num_lanes);
dp->status = connector_status_connected;
+ mutex_unlock(&dp->lock);
return connector_status_connected;
}
disconnected:
dp->status = connector_status_disconnected;
+ mutex_unlock(&dp->lock);
return connector_status_disconnected;
}
@@ -1673,6 +1689,7 @@ int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub)
dp->dev = &pdev->dev;
dp->dpsub = dpsub;
dp->status = connector_status_disconnected;
+ mutex_init(&dp->lock);
INIT_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func);
@@ -1781,4 +1798,5 @@ void zynqmp_dp_remove(struct zynqmp_dpsub *dpsub)
zynqmp_dp_phy_exit(dp);
zynqmp_dp_reset(dp, true);
+ mutex_destroy(&dp->lock);
}
--
2.35.1.1320.gc452695387.dirty
Add a debugfs interface for exercising the various test modes supported
by the DisplayPort controller. This allows performing compliance
testing, or performing signal integrity measurements on a failing link.
At the moment, we do not support sink-driven link quality testing,
although such support would be fairly easy to add.
Additionally, add some debugfs files for ignoring AUX errors and HPD
events, as this can allow testing with equipment that cannot emulate a
DPRX.
Signed-off-by: Sean Anderson <[email protected]>
---
(no changes since v2)
Changes in v2:
- Document debugfs files
- Add ignore_aux_errors and ignore_hpd debugfs files to replace earlier
implicit functionality
- Attempt to fix unreproducable, spurious build warning
Documentation/gpu/drivers.rst | 1 +
Documentation/gpu/zynqmp.rst | 149 +++++++
MAINTAINERS | 1 +
drivers/gpu/drm/xlnx/zynqmp_dp.c | 682 ++++++++++++++++++++++++++++++-
4 files changed, 830 insertions(+), 3 deletions(-)
create mode 100644 Documentation/gpu/zynqmp.rst
diff --git a/Documentation/gpu/drivers.rst b/Documentation/gpu/drivers.rst
index b899cbc5c2b4..187201aedbe5 100644
--- a/Documentation/gpu/drivers.rst
+++ b/Documentation/gpu/drivers.rst
@@ -22,6 +22,7 @@ GPU Driver Documentation
afbc
komeda-kms
panfrost
+ zynqmp
.. only:: subproject and html
diff --git a/Documentation/gpu/zynqmp.rst b/Documentation/gpu/zynqmp.rst
new file mode 100644
index 000000000000..f57bfa0ad6ec
--- /dev/null
+++ b/Documentation/gpu/zynqmp.rst
@@ -0,0 +1,149 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+===============================================
+Xilinx ZynqMP Ultrascale+ DisplayPort Subsystem
+===============================================
+
+This subsystem handles DisplayPort video and audio output on the ZynqMP. It
+supports in-memory framebuffers with the DisplayPort DMA controller
+(xilinx-dpdma), as well as "live" video and audio from the programmable logic
+(PL). This subsystem can perform several transformations, including color space
+conversion, alpha blending, and audio mixing, although not all features are
+currently supported.
+
+debugfs
+-------
+
+To support debugging and compliance testing, several test modes can be enabled
+though debugfs. The following files in /sys/kernel/debug/dri/X/DP-1/test/
+control the DisplayPort test modes:
+
+active:
+ Writing a 1 to this file will activate test mode, and writing a 0 will
+ deactivate test mode. Writing a 1 or 0 when the test mode is already
+ active/inactive will re-activate/re-deactivate test mode. When test
+ mode is inactive, changes made to other files will have no (immediate)
+ effect, although the settings will be saved for when test mode is
+ activated. When test mode is active, changes made to other files will
+ apply immediately.
+
+custom:
+ Custom test pattern value
+
+downspread:
+ Enable/disable clock downspreading (spread-spectrum clocking) by
+ writing 1/0
+
+enhanced:
+ Enable/disable enhanced framing
+
+ignore_aux_errors:
+ Ignore AUX errors when set to 1. Writes to this file take effect
+ immediately (regardless of whether test mode is active) and affect all
+ AUX transfers.
+
+ignore_hpd:
+ Ignore hotplug events (such as cable removals or monitor link
+ retraining requests) when set to 1. Writes to this file take effect
+ immediately (regardless of whether test mode is active).
+
+laneX_preemphasis:
+ Preemphasis from 0 (lowest) to 2 (highest) for lane X
+
+laneX_swing:
+ Voltage swing from 0 (lowest) to 3 (highest) for lane X
+
+lanes:
+ Number of lanes to use (1, 2, or 4)
+
+pattern:
+ Test pattern. May be one of:
+
+ video
+ Use regular video input
+
+ symbol-error
+ Symbol error measurement pattern
+
+ prbs7
+ Output of the PRBS7 (x^7 + x^6 + 1) polynomial
+
+ 80bit-custom
+ A custom 80-bit pattern
+
+ cp2520
+ HBR2 compliance eye pattern
+
+ tps1
+ Link training symbol pattern TPS1 (/D10.2/)
+
+ tps2
+ Link training symbol pattern TPS2
+
+ tps3
+ Link training symbol pattern TPS3 (for HBR2)
+
+rate:
+ Rate in hertz. One of
+
+ * 5400000000 (HBR2)
+ * 2700000000 (HBR)
+ * 1620000000 (RBR)
+
+You can dump the displayport test settings with the following command::
+
+ for prop in /sys/kernel/debug/dri/1/DP-1/test/*; do
+ printf '%-17s ' ${prop##*/}
+ if [ ${prop##*/} = custom ]; then
+ hexdump -C $prop | head -1
+ else
+ cat $prop
+ fi
+ done
+
+The output could look something like::
+
+ active 1
+ custom 00000000 00 00 00 00 00 00 00 00 00 00 |..........|
+ downspread 0
+ enhanced 1
+ ignore_aux_errors 1
+ ignore_hpd 1
+ lane0_preemphasis 0
+ lane0_swing 3
+ lane1_preemphasis 0
+ lane1_swing 3
+ lanes 2
+ pattern prbs7
+ rate 1620000000
+
+The recommended test procedure is to connect the board to a monitor,
+configure test mode, activate test mode, and then disconnect the cable
+and connect it to your test equipment of choice. For example, one
+sequence of commands could be::
+
+ echo 1 > /sys/kernel/debug/dri/1/DP-1/test/enhanced
+ echo tps1 > /sys/kernel/debug/dri/1/DP-1/test/pattern
+ echo 1620000000 > /sys/kernel/debug/dri/1/DP-1/test/rate
+ echo 1 > /sys/kernel/debug/dri/1/DP-1/test/ignore_aux_errors
+ echo 1 > /sys/kernel/debug/dri/1/DP-1/test/ignore_hpd
+ echo 1 > /sys/kernel/debug/dri/1/DP-1/test/active
+
+at which point the cable could be disconnected from the monitor.
+
+Internals
+---------
+
+.. kernel-doc:: drivers/gpu/drm/xlnx/zynqmp_disp.h
+
+.. kernel-doc:: drivers/gpu/drm/xlnx/zynqmp_dpsub.h
+
+.. kernel-doc:: drivers/gpu/drm/xlnx/zynqmp_kms.h
+
+.. kernel-doc:: drivers/gpu/drm/xlnx/zynqmp_disp.c
+
+.. kernel-doc:: drivers/gpu/drm/xlnx/zynqmp_dp.c
+
+.. kernel-doc:: drivers/gpu/drm/xlnx/zynqmp_dpsub.c
+
+.. kernel-doc:: drivers/gpu/drm/xlnx/zynqmp_kms.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 8d1052fa6a69..78680180aefc 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7305,6 +7305,7 @@ L: [email protected]
S: Maintained
T: git git://anongit.freedesktop.org/drm/drm-misc
F: Documentation/devicetree/bindings/display/xlnx/
+F: Documentation/gpu/zynqmp.rst
F: drivers/gpu/drm/xlnx/
DRM GPU SCHEDULER
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
index dea4b8a819fd..5cf9e514b848 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
@@ -18,7 +18,9 @@
#include <drm/drm_modes.h>
#include <drm/drm_of.h>
+#include <linux/bitfield.h>
#include <linux/clk.h>
+#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/io.h>
@@ -50,6 +52,7 @@ MODULE_PARM_DESC(power_on_delay_ms, "DP power on delay in msec (default: 4)");
#define ZYNQMP_DP_LANE_COUNT_SET 0x4
#define ZYNQMP_DP_ENHANCED_FRAME_EN 0x8
#define ZYNQMP_DP_TRAINING_PATTERN_SET 0xc
+#define ZYNQMP_DP_LINK_QUAL_PATTERN_SET 0x10
#define ZYNQMP_DP_SCRAMBLING_DISABLE 0x14
#define ZYNQMP_DP_DOWNSPREAD_CTL 0x18
#define ZYNQMP_DP_SOFTWARE_RESET 0x1c
@@ -63,6 +66,9 @@ MODULE_PARM_DESC(power_on_delay_ms, "DP power on delay in msec (default: 4)");
ZYNQMP_DP_SOFTWARE_RESET_STREAM3 | \
ZYNQMP_DP_SOFTWARE_RESET_STREAM4 | \
ZYNQMP_DP_SOFTWARE_RESET_AUX)
+#define ZYNQMP_DP_COMP_PATTERN_80BIT_1 0x20
+#define ZYNQMP_DP_COMP_PATTERN_80BIT_2 0x24
+#define ZYNQMP_DP_COMP_PATTERN_80BIT_3 0x28
/* Core enable registers */
#define ZYNQMP_DP_TRANSMITTER_ENABLE 0x80
@@ -206,6 +212,7 @@ MODULE_PARM_DESC(power_on_delay_ms, "DP power on delay in msec (default: 4)");
#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_2 BIT(2)
#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_3 BIT(3)
#define ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL 0xf
+#define ZYNQMP_DP_TRANSMIT_PRBS7 0x230
#define ZYNQMP_DP_PHY_PRECURSOR_LANE_0 0x23c
#define ZYNQMP_DP_PHY_PRECURSOR_LANE_1 0x240
#define ZYNQMP_DP_PHY_PRECURSOR_LANE_2 0x244
@@ -273,6 +280,69 @@ struct zynqmp_dp_config {
u8 bpp;
};
+/**
+ * enum test_pattern - Test patterns for test testing
+ * @TEST_VIDEO: Use regular video input
+ * @TEST_SYMBOL_ERROR: Symbol error measurement pattern
+ * @TEST_PRBS7: Output of the PRBS7 (x^7 + x^6 + 1) polynomial
+ * @TEST_80BIT_CUSTOM: A custom 80-bit pattern
+ * @TEST_CP2520: HBR2 compliance eye pattern
+ * @TEST_TPS1: Link training symbol pattern TPS1 (/D10.2/)
+ * @TEST_TPS2: Link training symbol pattern TPS2
+ * @TEST_TPS3: Link training symbol pattern TPS3 (for HBR2)
+ */
+enum test_pattern {
+ TEST_VIDEO,
+ TEST_TPS1,
+ TEST_TPS2,
+ TEST_TPS3,
+ TEST_SYMBOL_ERROR,
+ TEST_PRBS7,
+ TEST_80BIT_CUSTOM,
+ TEST_CP2520,
+};
+
+static const char *const test_pattern_str[] = {
+ [TEST_VIDEO] = "video",
+ [TEST_TPS1] = "tps1",
+ [TEST_TPS2] = "tps2",
+ [TEST_TPS3] = "tps3",
+ [TEST_SYMBOL_ERROR] = "symbol-error",
+ [TEST_PRBS7] = "prbs7",
+ [TEST_80BIT_CUSTOM] = "80bit-custom",
+ [TEST_CP2520] = "cp2520",
+};
+
+/**
+ * struct zynqmp_dp_test - Configuration for test mode
+ * @pattern: The test pattern
+ * @enhanced: Use enhanced framing
+ * @downspread: Use SSC
+ * @active: Whether test mode is active
+ * @custom: Custom pattern for %TEST_80BIT_CUSTOM
+ * @train_set: Voltage/preemphasis settings
+ * @bw_code: Bandwidth code for the link
+ * @link_cnt: Number of lanes
+ */
+struct zynqmp_dp_test {
+ enum test_pattern pattern;
+ bool enhanced, downspread, active;
+ u8 custom[10];
+ u8 train_set[ZYNQMP_DP_MAX_LANES];
+ u8 bw_code;
+ u8 link_cnt;
+};
+
+/**
+ * struct zynqmp_dp_train_set_priv - Private data for train_set debugfs files
+ * @dp: DisplayPort IP core structure
+ * @lane: The lane for this file
+ */
+struct zynqmp_dp_train_set_priv {
+ struct zynqmp_dp *dp;
+ int lane;
+};
+
/**
* struct zynqmp_dp - Xilinx DisplayPort core
* @dev: device structure
@@ -283,23 +353,28 @@ struct zynqmp_dp_config {
* @irq: irq
* @bridge: DRM bridge for the DP encoder
* @next_bridge: The downstream bridge
+ * @test: Configuration for test mode
* @config: IP core configuration from DTS
* @aux: aux channel
* @aux_done: Completed when we get an AUX reply or timeout
+ * @ignore_aux_errors: If set, AUX errors are suppressed
* @phy: PHY handles for DP lanes
* @num_lanes: number of enabled phy lanes
* @hpd_work: hot plug detection worker
* @hpd_irq_work: hot plug detection IRQ worker
+ * @ignore_hpd: If set, HPD events and IRQs are ignored
* @status: connection status
* @enabled: flag to indicate if the device is enabled
* @dpcd: DP configuration data from currently connected sink device
* @link_config: common link configuration between IP core and sink device
* @mode: current mode between IP core and sink device
* @train_set: set of training data
+ * @debugfs_train_set: Debugfs private data for @train_set
*
* @lock covers the link configuration in this struct and the device's
- * registers. It does not cover @aux. It is not strictly required for any of
- * the members which are only modified at probe/remove time (e.g. @dev).
+ * registers. It does not cover @aux or @ignore_aux_errors. It is not strictly
+ * required for any of the members which are only modified at probe/remove time
+ * (e.g. @dev).
*/
struct zynqmp_dp {
struct drm_dp_aux aux;
@@ -319,9 +394,13 @@ struct zynqmp_dp {
enum drm_connector_status status;
int irq;
bool enabled;
+ bool ignore_aux_errors;
+ bool ignore_hpd;
+ struct zynqmp_dp_train_set_priv debugfs_train_set[ZYNQMP_DP_MAX_LANES];
struct zynqmp_dp_mode mode;
struct zynqmp_dp_link_config link_config;
+ struct zynqmp_dp_test test;
struct zynqmp_dp_config config;
u8 dpcd[DP_RECEIVER_CAP_SIZE];
u8 train_set[ZYNQMP_DP_MAX_LANES];
@@ -1034,6 +1113,8 @@ zynqmp_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
if (dp->status == connector_status_disconnected) {
dev_dbg(dp->dev, "no connected aux device\n");
+ if (dp->ignore_aux_errors)
+ goto fake_response;
return -ENODEV;
}
@@ -1042,7 +1123,13 @@ zynqmp_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
dev_dbg(dp->dev, "failed to do aux transfer (%d)\n", ret);
- return ret;
+ if (!dp->ignore_aux_errors)
+ return ret;
+
+fake_response:
+ msg->reply = DP_AUX_NATIVE_REPLY_ACK;
+ memset(msg->buffer, 0, msg->size);
+ return msg->size;
}
/**
@@ -1616,6 +1703,584 @@ static struct edid *zynqmp_dp_bridge_get_edid(struct drm_bridge *bridge,
return drm_get_edid(connector, &dp->aux.ddc);
}
+/* -----------------------------------------------------------------------------
+ * debugfs
+ */
+
+/**
+ * zynqmp_dp_set_test_pattern() - Configure the link for a test pattern
+ * @dp: DisplayPort IP core structure
+ * @pattern: The test pattern to configure
+ * @custom: The custom pattern to use if @pattern is %TEST_80BIT_CUSTOM
+ *
+ * Return: 0 on success, or negative errno on (DPCD) failure
+ */
+static int zynqmp_dp_set_test_pattern(struct zynqmp_dp *dp,
+ enum test_pattern pattern,
+ u8 *const custom)
+{
+ bool scramble = false;
+ u32 train_pattern = 0;
+ u32 link_pattern = 0;
+ u8 dpcd_train = 0;
+ u8 dpcd_link = 0;
+ int ret;
+
+ switch (pattern) {
+ case TEST_TPS1:
+ train_pattern = 1;
+ break;
+ case TEST_TPS2:
+ train_pattern = 2;
+ break;
+ case TEST_TPS3:
+ train_pattern = 3;
+ break;
+ case TEST_SYMBOL_ERROR:
+ scramble = true;
+ link_pattern = DP_PHY_TEST_PATTERN_ERROR_COUNT;
+ break;
+ case TEST_PRBS7:
+ /* We use a dedicated register to enable PRBS7 */
+ dpcd_link = DP_LINK_QUAL_PATTERN_ERROR_RATE;
+ break;
+ case TEST_80BIT_CUSTOM: {
+ const u8 *p = custom;
+
+ link_pattern = DP_LINK_QUAL_PATTERN_80BIT_CUSTOM;
+
+ zynqmp_dp_write(dp, ZYNQMP_DP_COMP_PATTERN_80BIT_1,
+ (p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
+ zynqmp_dp_write(dp, ZYNQMP_DP_COMP_PATTERN_80BIT_2,
+ (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4]);
+ zynqmp_dp_write(dp, ZYNQMP_DP_COMP_PATTERN_80BIT_3,
+ (p[9] << 8) | p[8]);
+ break;
+ }
+ case TEST_CP2520:
+ link_pattern = DP_LINK_QUAL_PATTERN_CP2520_PAT_1;
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ fallthrough;
+ case TEST_VIDEO:
+ scramble = true;
+ }
+
+ zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, !scramble);
+ zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET, train_pattern);
+ zynqmp_dp_write(dp, ZYNQMP_DP_LINK_QUAL_PATTERN_SET, link_pattern);
+ zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMIT_PRBS7, pattern == TEST_PRBS7);
+
+ dpcd_link = dpcd_link ?: link_pattern;
+ dpcd_train = train_pattern;
+ if (!scramble)
+ dpcd_train |= DP_LINK_SCRAMBLING_DISABLE;
+
+ if (dp->dpcd[DP_DPCD_REV] < 0x12) {
+ if (pattern == TEST_CP2520)
+ dev_warn(dp->dev,
+ "can't set sink link quality pattern to CP2520 for DPCD < r1.2; error counters will be invalid\n");
+ else
+ dpcd_train |= FIELD_PREP(DP_LINK_QUAL_PATTERN_11_MASK,
+ dpcd_link);
+ } else {
+ u8 dpcd_link_lane[ZYNQMP_DP_MAX_LANES];
+
+ memset(dpcd_link_lane, dpcd_link, ZYNQMP_DP_MAX_LANES);
+ ret = drm_dp_dpcd_write(&dp->aux, DP_LINK_QUAL_LANE0_SET,
+ dpcd_link_lane, ZYNQMP_DP_MAX_LANES);
+ if (ret < 0)
+ return ret;
+ }
+
+ ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, dpcd_train);
+ return ret < 0 ? ret : 0;
+}
+
+static int zynqmp_dp_test_setup(struct zynqmp_dp *dp)
+{
+ return zynqmp_dp_setup(dp, dp->test.bw_code, dp->test.link_cnt,
+ dp->test.enhanced, dp->test.downspread);
+}
+
+static ssize_t zynqmp_dp_pattern_read(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct dentry *dentry = file->f_path.dentry;
+ struct zynqmp_dp *dp = file->private_data;
+ char buf[16];
+ ssize_t ret;
+
+ ret = debugfs_file_get(dentry);
+ if (unlikely(ret))
+ return ret;
+
+ mutex_lock(&dp->lock);
+ ret = snprintf(buf, sizeof(buf), "%s\n",
+ test_pattern_str[dp->test.pattern]);
+ mutex_unlock(&dp->lock);
+
+ debugfs_file_put(dentry);
+ return simple_read_from_buffer(user_buf, count, ppos, buf, ret);
+}
+
+static ssize_t zynqmp_dp_pattern_write(struct file *file,
+ const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+
+ struct dentry *dentry = file->f_path.dentry;
+ struct zynqmp_dp *dp = file->private_data;
+ char buf[16];
+ ssize_t ret;
+ int pattern;
+
+ ret = debugfs_file_get(dentry);
+ if (unlikely(ret))
+ return ret;
+
+ ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, user_buf,
+ count);
+ if (ret < 0)
+ goto out;
+ buf[ret] = '\0';
+
+ pattern = sysfs_match_string(test_pattern_str, buf);
+ if (pattern < 0) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ mutex_lock(&dp->lock);
+ dp->test.pattern = pattern;
+ if (dp->test.active)
+ ret = zynqmp_dp_set_test_pattern(dp, dp->test.pattern,
+ dp->test.custom) ?: ret;
+ mutex_unlock(&dp->lock);
+
+out:
+ debugfs_file_put(dentry);
+ return ret;
+}
+
+static const struct file_operations fops_zynqmp_dp_pattern = {
+ .read = zynqmp_dp_pattern_read,
+ .write = zynqmp_dp_pattern_write,
+ .open = simple_open,
+ .llseek = noop_llseek,
+};
+
+static int zynqmp_dp_enhanced_get(void *data, u64 *val)
+{
+ struct zynqmp_dp *dp = data;
+
+ mutex_lock(&dp->lock);
+ *val = dp->test.enhanced;
+ mutex_unlock(&dp->lock);
+ return 0;
+}
+
+static int zynqmp_dp_enhanced_set(void *data, u64 val)
+{
+ struct zynqmp_dp *dp = data;
+ int ret = 0;
+
+ mutex_lock(&dp->lock);
+ dp->test.enhanced = val;
+ if (dp->test.active)
+ ret = zynqmp_dp_test_setup(dp);
+ mutex_unlock(&dp->lock);
+
+ return ret;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_enhanced, zynqmp_dp_enhanced_get,
+ zynqmp_dp_enhanced_set, "%llu\n");
+
+static int zynqmp_dp_downspread_get(void *data, u64 *val)
+{
+ struct zynqmp_dp *dp = data;
+
+ mutex_lock(&dp->lock);
+ *val = dp->test.downspread;
+ mutex_unlock(&dp->lock);
+ return 0;
+}
+
+static int zynqmp_dp_downspread_set(void *data, u64 val)
+{
+ struct zynqmp_dp *dp = data;
+ int ret = 0;
+
+ mutex_lock(&dp->lock);
+ dp->test.downspread = val;
+ if (dp->test.active)
+ ret = zynqmp_dp_test_setup(dp);
+ mutex_unlock(&dp->lock);
+
+ return ret;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_downspread, zynqmp_dp_downspread_get,
+ zynqmp_dp_downspread_set, "%llu\n");
+
+static int zynqmp_dp_active_get(void *data, u64 *val)
+{
+ struct zynqmp_dp *dp = data;
+
+ mutex_lock(&dp->lock);
+ *val = dp->test.active;
+ mutex_unlock(&dp->lock);
+ return 0;
+}
+
+static int zynqmp_dp_active_set(void *data, u64 val)
+{
+ struct zynqmp_dp *dp = data;
+ int ret = 0;
+
+ mutex_lock(&dp->lock);
+ if (val) {
+ if (val < 2) {
+ ret = zynqmp_dp_test_setup(dp);
+ if (ret)
+ goto out;
+ }
+
+ ret = zynqmp_dp_set_test_pattern(dp, dp->test.pattern,
+ dp->test.custom);
+ if (ret)
+ goto out;
+
+ ret = zynqmp_dp_update_vs_emph(dp, dp->test.train_set);
+ if (ret)
+ goto out;
+
+ dp->test.active = true;
+ } else {
+ int err;
+
+ dp->test.active = false;
+ err = zynqmp_dp_set_test_pattern(dp, TEST_VIDEO, NULL);
+ if (err)
+ dev_warn(dp->dev, "could not clear test pattern: %d\n",
+ err);
+ zynqmp_dp_train_loop(dp);
+ }
+out:
+ mutex_unlock(&dp->lock);
+
+ return ret;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_active, zynqmp_dp_active_get,
+ zynqmp_dp_active_set, "%llu\n");
+
+static ssize_t zynqmp_dp_custom_read(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct dentry *dentry = file->f_path.dentry;
+ struct zynqmp_dp *dp = file->private_data;
+ ssize_t ret;
+
+ ret = debugfs_file_get(dentry);
+ if (unlikely(ret))
+ return ret;
+
+ mutex_lock(&dp->lock);
+ ret = simple_read_from_buffer(user_buf, count, ppos, &dp->test.custom,
+ sizeof(dp->test.custom));
+ mutex_unlock(&dp->lock);
+
+ debugfs_file_put(dentry);
+ return ret;
+}
+
+static ssize_t zynqmp_dp_custom_write(struct file *file,
+ const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+
+ struct dentry *dentry = file->f_path.dentry;
+ struct zynqmp_dp *dp = file->private_data;
+ ssize_t ret;
+ char buf[sizeof(dp->test.custom)];
+
+ ret = debugfs_file_get(dentry);
+ if (unlikely(ret))
+ return ret;
+
+ ret = simple_write_to_buffer(buf, sizeof(buf), ppos, user_buf, count);
+ if (ret < 0)
+ goto out;
+
+ mutex_lock(&dp->lock);
+ memcpy(dp->test.custom, buf, ret);
+ if (dp->test.active)
+ ret = zynqmp_dp_set_test_pattern(dp, dp->test.pattern,
+ dp->test.custom) ?: ret;
+ mutex_unlock(&dp->lock);
+
+out:
+ debugfs_file_put(dentry);
+ return ret;
+}
+
+static const struct file_operations fops_zynqmp_dp_custom = {
+ .read = zynqmp_dp_custom_read,
+ .write = zynqmp_dp_custom_write,
+ .open = simple_open,
+ .llseek = noop_llseek,
+};
+
+static int zynqmp_dp_swing_get(void *data, u64 *val)
+{
+ struct zynqmp_dp_train_set_priv *priv = data;
+ struct zynqmp_dp *dp = priv->dp;
+
+ mutex_lock(&dp->lock);
+ *val = dp->test.train_set[priv->lane] & DP_TRAIN_VOLTAGE_SWING_MASK;
+ mutex_unlock(&dp->lock);
+ return 0;
+}
+
+static int zynqmp_dp_swing_set(void *data, u64 val)
+{
+ struct zynqmp_dp_train_set_priv *priv = data;
+ struct zynqmp_dp *dp = priv->dp;
+ u8 *train_set = &dp->test.train_set[priv->lane];
+ int ret = 0;
+
+ if (val > 3)
+ return -EINVAL;
+
+ mutex_lock(&dp->lock);
+ *train_set &= ~(DP_TRAIN_MAX_SWING_REACHED |
+ DP_TRAIN_VOLTAGE_SWING_MASK);
+ *train_set |= val;
+ if (val == 3)
+ *train_set |= DP_TRAIN_MAX_SWING_REACHED;
+
+ if (dp->test.active)
+ ret = zynqmp_dp_update_vs_emph(dp, dp->test.train_set);
+ mutex_unlock(&dp->lock);
+
+ return ret;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_swing, zynqmp_dp_swing_get,
+ zynqmp_dp_swing_set, "%llu\n");
+
+static int zynqmp_dp_preemphasis_get(void *data, u64 *val)
+{
+ struct zynqmp_dp_train_set_priv *priv = data;
+ struct zynqmp_dp *dp = priv->dp;
+
+ mutex_lock(&dp->lock);
+ *val = FIELD_GET(DP_TRAIN_PRE_EMPHASIS_MASK,
+ dp->test.train_set[priv->lane]);
+ mutex_unlock(&dp->lock);
+ return 0;
+}
+
+static int zynqmp_dp_preemphasis_set(void *data, u64 val)
+{
+ struct zynqmp_dp_train_set_priv *priv = data;
+ struct zynqmp_dp *dp = priv->dp;
+ u8 *train_set = &dp->test.train_set[priv->lane];
+ int ret = 0;
+
+ if (val > 2)
+ return -EINVAL;
+
+ mutex_lock(&dp->lock);
+ *train_set &= ~(DP_TRAIN_MAX_PRE_EMPHASIS_REACHED |
+ DP_TRAIN_PRE_EMPHASIS_MASK);
+ *train_set |= val;
+ if (val == 2)
+ *train_set |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
+
+ if (dp->test.active)
+ ret = zynqmp_dp_update_vs_emph(dp, dp->test.train_set);
+ mutex_unlock(&dp->lock);
+
+ return ret;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_preemphasis, zynqmp_dp_preemphasis_get,
+ zynqmp_dp_preemphasis_set, "%llu\n");
+
+static int zynqmp_dp_lanes_get(void *data, u64 *val)
+{
+ struct zynqmp_dp *dp = data;
+
+ mutex_lock(&dp->lock);
+ *val = dp->test.link_cnt;
+ mutex_unlock(&dp->lock);
+ return 0;
+}
+
+static int zynqmp_dp_lanes_set(void *data, u64 val)
+{
+ struct zynqmp_dp *dp = data;
+ int ret = 0;
+
+ if (val > ZYNQMP_DP_MAX_LANES)
+ return -EINVAL;
+
+ mutex_lock(&dp->lock);
+ if (val > dp->num_lanes) {
+ ret = -EINVAL;
+ } else {
+ dp->test.link_cnt = val;
+ if (dp->test.active)
+ ret = zynqmp_dp_test_setup(dp);
+ }
+ mutex_unlock(&dp->lock);
+
+ return ret;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_lanes, zynqmp_dp_lanes_get,
+ zynqmp_dp_lanes_set, "%llu\n");
+
+static int zynqmp_dp_rate_get(void *data, u64 *val)
+{
+ struct zynqmp_dp *dp = data;
+
+ mutex_lock(&dp->lock);
+ *val = drm_dp_bw_code_to_link_rate(dp->test.bw_code) * 10000;
+ mutex_unlock(&dp->lock);
+ return 0;
+}
+
+static int zynqmp_dp_rate_set(void *data, u64 val)
+{
+ struct zynqmp_dp *dp = data;
+ int link_rate;
+ int ret = 0;
+ u8 bw_code;
+
+ if (do_div(val, 10000))
+ return -EINVAL;
+
+ bw_code = drm_dp_link_rate_to_bw_code(val);
+ link_rate = drm_dp_bw_code_to_link_rate(bw_code);
+ if (val != link_rate)
+ return -EINVAL;
+
+ if (bw_code != DP_LINK_BW_1_62 && bw_code != DP_LINK_BW_2_7 &&
+ bw_code != DP_LINK_BW_5_4)
+ return -EINVAL;
+
+ mutex_lock(&dp->lock);
+ dp->test.bw_code = bw_code;
+ if (dp->test.active)
+ ret = zynqmp_dp_test_setup(dp);
+ mutex_unlock(&dp->lock);
+
+ return ret;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_rate, zynqmp_dp_rate_get,
+ zynqmp_dp_rate_set, "%llu\n");
+
+static int zynqmp_dp_ignore_aux_errors_get(void *data, u64 *val)
+{
+ struct zynqmp_dp *dp = data;
+
+ mutex_lock(&dp->aux.hw_mutex);
+ *val = dp->ignore_aux_errors;
+ mutex_unlock(&dp->aux.hw_mutex);
+ return 0;
+}
+
+static int zynqmp_dp_ignore_aux_errors_set(void *data, u64 val)
+{
+ struct zynqmp_dp *dp = data;
+
+ if (val != !!val)
+ return -EINVAL;
+
+ mutex_lock(&dp->aux.hw_mutex);
+ dp->ignore_aux_errors = val;
+ mutex_unlock(&dp->aux.hw_mutex);
+ return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_ignore_aux_errors,
+ zynqmp_dp_ignore_aux_errors_get,
+ zynqmp_dp_ignore_aux_errors_set, "%llu\n");
+
+static int zynqmp_dp_ignore_hpd_get(void *data, u64 *val)
+{
+ struct zynqmp_dp *dp = data;
+
+ mutex_lock(&dp->lock);
+ *val = dp->ignore_hpd;
+ mutex_unlock(&dp->lock);
+ return 0;
+}
+
+static int zynqmp_dp_ignore_hpd_set(void *data, u64 val)
+{
+ struct zynqmp_dp *dp = data;
+
+ if (val != !!val)
+ return -EINVAL;
+
+ mutex_lock(&dp->lock);
+ dp->ignore_hpd = val;
+ mutex_lock(&dp->lock);
+ return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_ignore_hpd, zynqmp_dp_ignore_hpd_get,
+ zynqmp_dp_ignore_hpd_set, "%llu\n");
+
+static void zynqmp_dp_bridge_debugfs_init(struct drm_bridge *bridge,
+ struct dentry *root)
+{
+ struct zynqmp_dp *dp = bridge_to_dp(bridge);
+ struct dentry *test;
+ int i;
+
+ dp->test.bw_code = DP_LINK_BW_5_4;
+ dp->test.link_cnt = dp->num_lanes;
+
+ test = debugfs_create_dir("test", root);
+#define CREATE_FILE(name) \
+ debugfs_create_file(#name, 0600, test, dp, &fops_zynqmp_dp_##name)
+ CREATE_FILE(pattern);
+ CREATE_FILE(enhanced);
+ CREATE_FILE(downspread);
+ CREATE_FILE(active);
+ CREATE_FILE(custom);
+ CREATE_FILE(rate);
+ CREATE_FILE(lanes);
+ CREATE_FILE(ignore_aux_errors);
+ CREATE_FILE(ignore_hpd);
+
+ for (i = 0; i < dp->num_lanes; i++) {
+ static const char fmt[] = "lane%d_preemphasis";
+ char name[sizeof(fmt)];
+
+ dp->debugfs_train_set[i].dp = dp;
+ dp->debugfs_train_set[i].lane = i;
+
+ snprintf(name, sizeof(name), fmt, i);
+ debugfs_create_file(name, 0600, test,
+ &dp->debugfs_train_set[i],
+ &fops_zynqmp_dp_preemphasis);
+
+ snprintf(name, sizeof(name), "lane%d_swing", i);
+ debugfs_create_file(name, 0600, test,
+ &dp->debugfs_train_set[i],
+ &fops_zynqmp_dp_swing);
+ }
+}
+
static const struct drm_bridge_funcs zynqmp_dp_bridge_funcs = {
.attach = zynqmp_dp_bridge_attach,
.detach = zynqmp_dp_bridge_detach,
@@ -1628,6 +2293,7 @@ static const struct drm_bridge_funcs zynqmp_dp_bridge_funcs = {
.atomic_check = zynqmp_dp_bridge_atomic_check,
.detect = zynqmp_dp_bridge_detect,
.get_edid = zynqmp_dp_bridge_get_edid,
+ .debugfs_init = zynqmp_dp_bridge_debugfs_init,
};
/* -----------------------------------------------------------------------------
@@ -1662,6 +2328,11 @@ static void zynqmp_dp_hpd_work_func(struct work_struct *work)
enum drm_connector_status status;
mutex_lock(&dp->lock);
+ if (dp->ignore_hpd) {
+ mutex_unlock(&dp->lock);
+ return;
+ }
+
status = __zynqmp_dp_bridge_detect(dp);
mutex_unlock(&dp->lock);
@@ -1676,6 +2347,11 @@ static void zynqmp_dp_hpd_irq_work_func(struct work_struct *work)
int err;
mutex_lock(&dp->lock);
+ if (dp->ignore_hpd) {
+ mutex_unlock(&dp->lock);
+ return;
+ }
+
err = drm_dp_dpcd_read(&dp->aux, DP_SINK_COUNT, status,
DP_LINK_STATUS_SIZE + 2);
if (err < 0) {
--
2.35.1.1320.gc452695387.dirty
In preparation for supporting compliance testing, split off several
helper functions. No functional change intended.
Signed-off-by: Sean Anderson <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Reviewed-by: Tomi Valkeinen <[email protected]>
---
(no changes since v1)
drivers/gpu/drm/xlnx/zynqmp_dp.c | 49 ++++++++++++++++++++++----------
1 file changed, 34 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
index 3d90533aefd7..364caaf26f49 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
@@ -635,6 +635,7 @@ static void zynqmp_dp_adjust_train(struct zynqmp_dp *dp,
/**
* zynqmp_dp_update_vs_emph - Update the training values
* @dp: DisplayPort IP core structure
+ * @train_set: A set of training values
*
* Update the training values based on the request from sink. The mapped values
* are predefined, and values(vs, pe, pc) are from the device manual.
@@ -642,12 +643,12 @@ static void zynqmp_dp_adjust_train(struct zynqmp_dp *dp,
* Return: 0 if vs and emph are updated successfully, or the error code returned
* by drm_dp_dpcd_write().
*/
-static int zynqmp_dp_update_vs_emph(struct zynqmp_dp *dp)
+static int zynqmp_dp_update_vs_emph(struct zynqmp_dp *dp, u8 *train_set)
{
unsigned int i;
int ret;
- ret = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, dp->train_set,
+ ret = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, train_set,
dp->mode.lane_cnt);
if (ret < 0)
return ret;
@@ -655,7 +656,7 @@ static int zynqmp_dp_update_vs_emph(struct zynqmp_dp *dp)
for (i = 0; i < dp->mode.lane_cnt; i++) {
u32 reg = ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0 + i * 4;
union phy_configure_opts opts = { 0 };
- u8 train = dp->train_set[i];
+ u8 train = train_set[i];
opts.dp.voltage[0] = (train & DP_TRAIN_VOLTAGE_SWING_MASK)
>> DP_TRAIN_VOLTAGE_SWING_SHIFT;
@@ -699,7 +700,7 @@ static int zynqmp_dp_link_train_cr(struct zynqmp_dp *dp)
* So, This loop should exit before 512 iterations
*/
for (max_tries = 0; max_tries < 512; max_tries++) {
- ret = zynqmp_dp_update_vs_emph(dp);
+ ret = zynqmp_dp_update_vs_emph(dp, dp->train_set);
if (ret)
return ret;
@@ -764,7 +765,7 @@ static int zynqmp_dp_link_train_ce(struct zynqmp_dp *dp)
return ret;
for (tries = 0; tries < DP_MAX_TRAINING_TRIES; tries++) {
- ret = zynqmp_dp_update_vs_emph(dp);
+ ret = zynqmp_dp_update_vs_emph(dp, dp->train_set);
if (ret)
return ret;
@@ -787,28 +788,29 @@ static int zynqmp_dp_link_train_ce(struct zynqmp_dp *dp)
}
/**
- * zynqmp_dp_train - Train the link
+ * zynqmp_dp_setup() - Set up major link parameters
* @dp: DisplayPort IP core structure
+ * @bw_code: The link bandwidth as a multiple of 270 MHz
+ * @lane_cnt: The number of lanes to use
+ * @enhanced: Use enhanced framing
+ * @downspread: Enable spread-spectrum clocking
*
- * Return: 0 if all trains are done successfully, or corresponding error code.
+ * Return: 0 on success, or -errno on failure
*/
-static int zynqmp_dp_train(struct zynqmp_dp *dp)
+static int zynqmp_dp_setup(struct zynqmp_dp *dp, u8 bw_code, u8 lane_cnt,
+ bool enhanced, bool downspread)
{
u32 reg;
- u8 bw_code = dp->mode.bw_code;
- u8 lane_cnt = dp->mode.lane_cnt;
u8 aux_lane_cnt = lane_cnt;
- bool enhanced;
int ret;
zynqmp_dp_write(dp, ZYNQMP_DP_LANE_COUNT_SET, lane_cnt);
- enhanced = drm_dp_enhanced_frame_cap(dp->dpcd);
if (enhanced) {
zynqmp_dp_write(dp, ZYNQMP_DP_ENHANCED_FRAME_EN, 1);
aux_lane_cnt |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
}
- if (dp->dpcd[3] & 0x1) {
+ if (downspread) {
zynqmp_dp_write(dp, ZYNQMP_DP_DOWNSPREAD_CTL, 1);
drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL,
DP_SPREAD_AMP_0_5);
@@ -851,8 +853,25 @@ static int zynqmp_dp_train(struct zynqmp_dp *dp)
}
zynqmp_dp_write(dp, ZYNQMP_DP_PHY_CLOCK_SELECT, reg);
- ret = zynqmp_dp_phy_ready(dp);
- if (ret < 0)
+ return zynqmp_dp_phy_ready(dp);
+}
+
+
+/**
+ * zynqmp_dp_train - Train the link
+ * @dp: DisplayPort IP core structure
+ *
+ * Return: 0 if all trains are done successfully, or corresponding error code.
+ */
+static int zynqmp_dp_train(struct zynqmp_dp *dp)
+{
+ int ret;
+
+ ret = zynqmp_dp_setup(dp, dp->mode.bw_code, dp->mode.lane_cnt,
+ drm_dp_enhanced_frame_cap(dp->dpcd),
+ dp->dpcd[DP_MAX_DOWNSPREAD] &
+ DP_MAX_DOWNSPREAD_0_5);
+ if (ret)
return ret;
zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, 1);
--
2.35.1.1320.gc452695387.dirty
On 4/22/24 14:45, Sean Anderson wrote:
> This series cleans up the zyqnmp_dp IRQ and locking situation. Once
> that's done, it adds debugfs support. The intent is to enable compliance
> testing or to help debug signal-integrity issues.
>
> Last time I discussed converting the HPD work(s) to a threaded IRQ. I
> did not end up doing that for this series since the steps would be
>
> - Add locking
> - Move link retraining to a work function
> - Harden the IRQ
> - Merge the works into a threaded IRQ (omitted)
>
> Which with the exception of the final step is the same as leaving those
> works as-is. Conversion to a threaded IRQ can be done as a follow-up.
>
> Changes in v3:
> - Store base pointers in zynqmp_disp directly
> - Don't delay work
> - Convert to a hard IRQ
> - Use AUX IRQs instead of polling
> - Take dp->lock in zynqmp_dp_hpd_work_func
>
> Changes in v2:
> - Fix kerneldoc
> - Rearrange zynqmp_dp for better padding
> - Split off the HPD IRQ work into another commit
> - Expand the commit message
> - Document hpd_irq_work
> - Document debugfs files
> - Add ignore_aux_errors and ignore_hpd debugfs files to replace earlier
> implicit functionality
> - Attempt to fix unreproducable, spurious build warning
> - Drop "Optionally ignore DPCD errors" in favor of a debugfs file
> directly affecting zynqmp_dp_aux_transfer.
>
> Sean Anderson (13):
> drm: xlnx: Store base pointers in zynqmp_disp directly
> drm: xlnx: Fix kerneldoc
> drm: zynqmp_dp: Downgrade log level for aux retries message
> drm: zynqmp_dp: Adjust training values per-lane
> drm: zynqmp_dp: Rearrange zynqmp_dp for better padding
> drm: zynqmp_dp: Don't delay work
> drm: zynqmp_dp: Add locking
> drm: zynqmp_dp: Don't retrain the link in our IRQ
> drm: zynqmp_dp: Convert to a hard IRQ
> drm: zynqmp_dp: Use AUX IRQs instead of polling
> drm: zynqmp_dp: Split off several helper functions
> drm: zynqmp_dp: Take dp->lock in zynqmp_dp_hpd_work_func
> drm: zynqmp_dp: Add debugfs interface for compliance testing
>
> Documentation/gpu/drivers.rst | 1 +
> Documentation/gpu/zynqmp.rst | 149 +++++
> MAINTAINERS | 1 +
> drivers/gpu/drm/xlnx/zynqmp_disp.c | 44 +-
> drivers/gpu/drm/xlnx/zynqmp_dp.c | 909 +++++++++++++++++++++++++---
> drivers/gpu/drm/xlnx/zynqmp_dpsub.h | 1 +
> drivers/gpu/drm/xlnx/zynqmp_kms.h | 4 +-
> 7 files changed, 1000 insertions(+), 109 deletions(-)
> create mode 100644 Documentation/gpu/zynqmp.rst
>
+CC Tomi, who I forgot to add initially...
Sort the members of struct zynqmp_dp to reduce padding necessary for
alignment.
Signed-off-by: Sean Anderson <[email protected]>
---
(no changes since v2)
Changes in v2:
- New
drivers/gpu/drm/xlnx/zynqmp_dp.c | 28 ++++++++++++++--------------
1 file changed, 14 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
index 8635b5673386..f1834c8e3c02 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
@@ -255,10 +255,10 @@ struct zynqmp_dp_link_config {
* @fmt: format identifier string
*/
struct zynqmp_dp_mode {
- u8 bw_code;
- u8 lane_cnt;
- int pclock;
const char *fmt;
+ int pclock;
+ u8 bw_code;
+ u8 lane_cnt;
};
/**
@@ -295,27 +295,27 @@ struct zynqmp_dp_config {
* @train_set: set of training data
*/
struct zynqmp_dp {
+ struct drm_dp_aux aux;
+ struct drm_bridge bridge;
+ struct delayed_work hpd_work;
+
+ struct drm_bridge *next_bridge;
struct device *dev;
struct zynqmp_dpsub *dpsub;
void __iomem *iomem;
struct reset_control *reset;
- int irq;
-
- struct drm_bridge bridge;
- struct drm_bridge *next_bridge;
-
- struct zynqmp_dp_config config;
- struct drm_dp_aux aux;
struct phy *phy[ZYNQMP_DP_MAX_LANES];
- u8 num_lanes;
- struct delayed_work hpd_work;
+
enum drm_connector_status status;
+ int irq;
bool enabled;
- u8 dpcd[DP_RECEIVER_CAP_SIZE];
- struct zynqmp_dp_link_config link_config;
struct zynqmp_dp_mode mode;
+ struct zynqmp_dp_link_config link_config;
+ struct zynqmp_dp_config config;
+ u8 dpcd[DP_RECEIVER_CAP_SIZE];
u8 train_set[ZYNQMP_DP_MAX_LANES];
+ u8 num_lanes;
};
static inline struct zynqmp_dp *bridge_to_dp(struct drm_bridge *bridge)
--
2.35.1.1320.gc452695387.dirty
On 22/04/2024 21:45, Sean Anderson wrote:
> Fix a few errors in the kerneldoc. Mostly this addresses missing/renamed
> members.
>
> Signed-off-by: Sean Anderson <[email protected]>
> ---
Reviewed-by: Tomi Valkeinen <[email protected]>
Tomi
>
> Changes in v3:
> - Split off documentation for base pointers to previous commit
>
> Changes in v2:
> - New
>
> drivers/gpu/drm/xlnx/zynqmp_dpsub.h | 1 +
> drivers/gpu/drm/xlnx/zynqmp_kms.h | 4 ++--
> 2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/xlnx/zynqmp_dpsub.h b/drivers/gpu/drm/xlnx/zynqmp_dpsub.h
> index 09ea01878f2a..b18554467e9c 100644
> --- a/drivers/gpu/drm/xlnx/zynqmp_dpsub.h
> +++ b/drivers/gpu/drm/xlnx/zynqmp_dpsub.h
> @@ -53,6 +53,7 @@ enum zynqmp_dpsub_format {
> * @drm: The DRM/KMS device data
> * @bridge: The DP encoder bridge
> * @disp: The display controller
> + * @layers: Video and graphics layers
> * @dp: The DisplayPort controller
> * @dma_align: DMA alignment constraint (must be a power of 2)
> */
> diff --git a/drivers/gpu/drm/xlnx/zynqmp_kms.h b/drivers/gpu/drm/xlnx/zynqmp_kms.h
> index 01be96b00e3f..cb13c6b8008e 100644
> --- a/drivers/gpu/drm/xlnx/zynqmp_kms.h
> +++ b/drivers/gpu/drm/xlnx/zynqmp_kms.h
> @@ -22,9 +22,9 @@
> struct zynqmp_dpsub;
>
> /**
> - * struct zynqmp_dpsub - ZynqMP DisplayPort Subsystem DRM/KMS data
> + * struct zynqmp_dpsub_drm - ZynqMP DisplayPort Subsystem DRM/KMS data
> * @dpsub: Backpointer to the DisplayPort subsystem
> - * @drm: The DRM/KMS device
> + * @dev: The DRM/KMS device
> * @planes: The DRM planes
> * @crtc: The DRM CRTC
> * @encoder: The dummy DRM encoder
On 22/04/2024 21:45, Sean Anderson wrote:
> We always call scheduled_delayed_work with no delay, so just use a
> non-delayed work_struct instead.
>
> Signed-off-by: Sean Anderson <[email protected]>
> ---
Reviewed-by: Tomi Valkeinen <[email protected]>
Tomi
>
> Changes in v3:
> - New
>
> drivers/gpu/drm/xlnx/zynqmp_dp.c | 13 ++++++-------
> 1 file changed, 6 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
> index f1834c8e3c02..59fed00a8f89 100644
> --- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
> +++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
> @@ -297,7 +297,7 @@ struct zynqmp_dp_config {
> struct zynqmp_dp {
> struct drm_dp_aux aux;
> struct drm_bridge bridge;
> - struct delayed_work hpd_work;
> + struct work_struct hpd_work;
>
> struct drm_bridge *next_bridge;
> struct device *dev;
> @@ -1467,7 +1467,7 @@ static void zynqmp_dp_bridge_atomic_disable(struct drm_bridge *bridge,
> struct zynqmp_dp *dp = bridge_to_dp(bridge);
>
> dp->enabled = false;
> - cancel_delayed_work(&dp->hpd_work);
> + cancel_work(&dp->hpd_work);
> zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 0);
> drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D3);
> zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN,
> @@ -1603,8 +1603,7 @@ void zynqmp_dp_disable_vblank(struct zynqmp_dp *dp)
>
> static void zynqmp_dp_hpd_work_func(struct work_struct *work)
> {
> - struct zynqmp_dp *dp = container_of(work, struct zynqmp_dp,
> - hpd_work.work);
> + struct zynqmp_dp *dp = container_of(work, struct zynqmp_dp, hpd_work);
> enum drm_connector_status status;
>
> status = zynqmp_dp_bridge_detect(&dp->bridge);
> @@ -1633,7 +1632,7 @@ static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data)
> zynqmp_dpsub_drm_handle_vblank(dp->dpsub);
>
> if (status & ZYNQMP_DP_INT_HPD_EVENT)
> - schedule_delayed_work(&dp->hpd_work, 0);
> + schedule_work(&dp->hpd_work);
>
> if (status & ZYNQMP_DP_INT_HPD_IRQ) {
> int ret;
> @@ -1675,7 +1674,7 @@ int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub)
> dp->dpsub = dpsub;
> dp->status = connector_status_disconnected;
>
> - INIT_DELAYED_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func);
> + INIT_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func);
>
> /* Acquire all resources (IOMEM, IRQ and PHYs). */
> res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dp");
> @@ -1775,7 +1774,7 @@ void zynqmp_dp_remove(struct zynqmp_dpsub *dpsub)
> zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_ALL);
> disable_irq(dp->irq);
>
> - cancel_delayed_work_sync(&dp->hpd_work);
> + cancel_work_sync(&dp->hpd_work);
>
> zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0);
> zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff);
Hi Sean,
On 22/04/2024 21:45, Sean Anderson wrote:
> This series cleans up the zyqnmp_dp IRQ and locking situation. Once
> that's done, it adds debugfs support. The intent is to enable compliance
> testing or to help debug signal-integrity issues.
>
> Last time I discussed converting the HPD work(s) to a threaded IRQ. I
> did not end up doing that for this series since the steps would be
>
> - Add locking
> - Move link retraining to a work function
> - Harden the IRQ
> - Merge the works into a threaded IRQ (omitted)
>
> Which with the exception of the final step is the same as leaving those
> works as-is. Conversion to a threaded IRQ can be done as a follow-up.
What is the base for this series? I'm having trouble applying it.
I managed to mostly apply it, but I see the board hang when I unload the
modules. I didn't debug it as it might as well be caused by my conflict
resolution.
Tomi
> Changes in v3:
> - Store base pointers in zynqmp_disp directly
> - Don't delay work
> - Convert to a hard IRQ
> - Use AUX IRQs instead of polling
> - Take dp->lock in zynqmp_dp_hpd_work_func
>
> Changes in v2:
> - Fix kerneldoc
> - Rearrange zynqmp_dp for better padding
> - Split off the HPD IRQ work into another commit
> - Expand the commit message
> - Document hpd_irq_work
> - Document debugfs files
> - Add ignore_aux_errors and ignore_hpd debugfs files to replace earlier
> implicit functionality
> - Attempt to fix unreproducable, spurious build warning
> - Drop "Optionally ignore DPCD errors" in favor of a debugfs file
> directly affecting zynqmp_dp_aux_transfer.
>
> Sean Anderson (13):
> drm: xlnx: Store base pointers in zynqmp_disp directly
> drm: xlnx: Fix kerneldoc
> drm: zynqmp_dp: Downgrade log level for aux retries message
> drm: zynqmp_dp: Adjust training values per-lane
> drm: zynqmp_dp: Rearrange zynqmp_dp for better padding
> drm: zynqmp_dp: Don't delay work
> drm: zynqmp_dp: Add locking
> drm: zynqmp_dp: Don't retrain the link in our IRQ
> drm: zynqmp_dp: Convert to a hard IRQ
> drm: zynqmp_dp: Use AUX IRQs instead of polling
> drm: zynqmp_dp: Split off several helper functions
> drm: zynqmp_dp: Take dp->lock in zynqmp_dp_hpd_work_func
> drm: zynqmp_dp: Add debugfs interface for compliance testing
>
> Documentation/gpu/drivers.rst | 1 +
> Documentation/gpu/zynqmp.rst | 149 +++++
> MAINTAINERS | 1 +
> drivers/gpu/drm/xlnx/zynqmp_disp.c | 44 +-
> drivers/gpu/drm/xlnx/zynqmp_dp.c | 909 +++++++++++++++++++++++++---
> drivers/gpu/drm/xlnx/zynqmp_dpsub.h | 1 +
> drivers/gpu/drm/xlnx/zynqmp_kms.h | 4 +-
> 7 files changed, 1000 insertions(+), 109 deletions(-)
> create mode 100644 Documentation/gpu/zynqmp.rst
>
On 4/23/24 09:33, Tomi Valkeinen wrote:
> Hi Sean,
>
> On 22/04/2024 21:45, Sean Anderson wrote:
>> This series cleans up the zyqnmp_dp IRQ and locking situation. Once
>> that's done, it adds debugfs support. The intent is to enable compliance
>> testing or to help debug signal-integrity issues.
>>
>> Last time I discussed converting the HPD work(s) to a threaded IRQ. I
>> did not end up doing that for this series since the steps would be
>>
>> - Add locking
>> - Move link retraining to a work function
>> - Harden the IRQ
>> - Merge the works into a threaded IRQ (omitted)
>>
>> Which with the exception of the final step is the same as leaving those
>> works as-is. Conversion to a threaded IRQ can be done as a follow-up.
>
> What is the base for this series? I'm having trouble applying it.
>
> I managed to mostly apply it, but I see the board hang when I unload the modules. I didn't debug it as it might as well be caused by my conflict resolution.
The base is v6.8-rc1, but it should probably be v6.9. I can rebase and resend.
--Sean
>> Changes in v3:
>> - Store base pointers in zynqmp_disp directly
>> - Don't delay work
>> - Convert to a hard IRQ
>> - Use AUX IRQs instead of polling
>> - Take dp->lock in zynqmp_dp_hpd_work_func
>>
>> Changes in v2:
>> - Fix kerneldoc
>> - Rearrange zynqmp_dp for better padding
>> - Split off the HPD IRQ work into another commit
>> - Expand the commit message
>> - Document hpd_irq_work
>> - Document debugfs files
>> - Add ignore_aux_errors and ignore_hpd debugfs files to replace earlier
>> implicit functionality
>> - Attempt to fix unreproducable, spurious build warning
>> - Drop "Optionally ignore DPCD errors" in favor of a debugfs file
>> directly affecting zynqmp_dp_aux_transfer.
>>
>> Sean Anderson (13):
>> drm: xlnx: Store base pointers in zynqmp_disp directly
>> drm: xlnx: Fix kerneldoc
>> drm: zynqmp_dp: Downgrade log level for aux retries message
>> drm: zynqmp_dp: Adjust training values per-lane
>> drm: zynqmp_dp: Rearrange zynqmp_dp for better padding
>> drm: zynqmp_dp: Don't delay work
>> drm: zynqmp_dp: Add locking
>> drm: zynqmp_dp: Don't retrain the link in our IRQ
>> drm: zynqmp_dp: Convert to a hard IRQ
>> drm: zynqmp_dp: Use AUX IRQs instead of polling
>> drm: zynqmp_dp: Split off several helper functions
>> drm: zynqmp_dp: Take dp->lock in zynqmp_dp_hpd_work_func
>> drm: zynqmp_dp: Add debugfs interface for compliance testing
>>
>> Documentation/gpu/drivers.rst | 1 +
>> Documentation/gpu/zynqmp.rst | 149 +++++
>> MAINTAINERS | 1 +
>> drivers/gpu/drm/xlnx/zynqmp_disp.c | 44 +-
>> drivers/gpu/drm/xlnx/zynqmp_dp.c | 909 +++++++++++++++++++++++++---
>> drivers/gpu/drm/xlnx/zynqmp_dpsub.h | 1 +
>> drivers/gpu/drm/xlnx/zynqmp_kms.h | 4 +-
>> 7 files changed, 1000 insertions(+), 109 deletions(-)
>> create mode 100644 Documentation/gpu/zynqmp.rst
>>
>
On 23/04/2024 17:59, Sean Anderson wrote:
> On 4/23/24 09:33, Tomi Valkeinen wrote:
>> Hi Sean,
>>
>> On 22/04/2024 21:45, Sean Anderson wrote:
>>> This series cleans up the zyqnmp_dp IRQ and locking situation. Once
>>> that's done, it adds debugfs support. The intent is to enable compliance
>>> testing or to help debug signal-integrity issues.
>>>
>>> Last time I discussed converting the HPD work(s) to a threaded IRQ. I
>>> did not end up doing that for this series since the steps would be
>>>
>>> - Add locking
>>> - Move link retraining to a work function
>>> - Harden the IRQ
>>> - Merge the works into a threaded IRQ (omitted)
>>>
>>> Which with the exception of the final step is the same as leaving those
>>> works as-is. Conversion to a threaded IRQ can be done as a follow-up.
>>
>> What is the base for this series? I'm having trouble applying it.
>>
>> I managed to mostly apply it, but I see the board hang when I unload the modules. I didn't debug it as it might as well be caused by my conflict resolution.
>
> The base is v6.8-rc1, but it should probably be v6.9. I can rebase and resend.
Did you have something extra in your branch before the series? I got
"error: sha1 information is lacking or useless".
Tomi
On 4/23/24 11:30, Tomi Valkeinen wrote:
> On 23/04/2024 17:59, Sean Anderson wrote:
>> On 4/23/24 09:33, Tomi Valkeinen wrote:
>>> Hi Sean,
>>>
>>> On 22/04/2024 21:45, Sean Anderson wrote:
>>>> This series cleans up the zyqnmp_dp IRQ and locking situation. Once
>>>> that's done, it adds debugfs support. The intent is to enable compliance
>>>> testing or to help debug signal-integrity issues.
>>>>
>>>> Last time I discussed converting the HPD work(s) to a threaded IRQ. I
>>>> did not end up doing that for this series since the steps would be
>>>>
>>>> - Add locking
>>>> - Move link retraining to a work function
>>>> - Harden the IRQ
>>>> - Merge the works into a threaded IRQ (omitted)
>>>>
>>>> Which with the exception of the final step is the same as leaving those
>>>> works as-is. Conversion to a threaded IRQ can be done as a follow-up.
>>>
>>> What is the base for this series? I'm having trouble applying it.
>>>
>>> I managed to mostly apply it, but I see the board hang when I unload the modules. I didn't debug it as it might as well be caused by my conflict resolution.
>>
>> The base is v6.8-rc1, but it should probably be v6.9. I can rebase and resend.
>
> Did you have something extra in your branch before the series? I got "error: sha1 information is lacking or useless".
Nope.
--Sean