Group below 4 dp driver related patches into one series.
Kuogee Hsieh (4):
drm/msm/dp: do not initialize phy until plugin interrupt received
drm/msm/dp: populate connector of struct dp_panel
drm/msm/dp: add support of tps4 (training pattern 4) for HBR3
drm/msm/dp: stop link training after link training 2 failed
drivers/gpu/drm/msm/dp/dp_catalog.c | 12 ++---
drivers/gpu/drm/msm/dp/dp_catalog.h | 2 +-
drivers/gpu/drm/msm/dp/dp_ctrl.c | 100 ++++++++++++++++------------------
drivers/gpu/drm/msm/dp/dp_ctrl.h | 8 +--
drivers/gpu/drm/msm/dp/dp_display.c | 105 +++++++++++++++++++++---------------
5 files changed, 118 insertions(+), 109 deletions(-)
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
From: Kuogee Hsieh <[email protected]>
Some DP sinkers prefer to use tps4 instead of tps3 during training #2.
This patch will use tps4 to perform link training #2 if sinker's DPCD
supports it.
Changes in V2:
-- replace dp_catalog_ctrl_set_pattern() with dp_catalog_ctrl_set_pattern_state_bit()
Changes in V3:
-- change state_ctrl_bits type to u32 and pattern type to u8
Changes in V4:
-- align } else if { and } else {
Changes in v10:
-- group into one series
Changes in v11:
-- drop drm/msm/dp: dp_link_parse_sink_count() return immediately if aux read
Signed-off-by: Kuogee Hsieh <[email protected]>
Reviewed-by: Stephen Boyd <[email protected]>
---
drivers/gpu/drm/msm/dp/dp_catalog.c | 12 ++++++------
drivers/gpu/drm/msm/dp/dp_catalog.h | 2 +-
drivers/gpu/drm/msm/dp/dp_ctrl.c | 17 ++++++++++++-----
3 files changed, 19 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c b/drivers/gpu/drm/msm/dp/dp_catalog.c
index 6ae9b29..64f0b26 100644
--- a/drivers/gpu/drm/msm/dp/dp_catalog.c
+++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
@@ -456,19 +456,19 @@ void dp_catalog_ctrl_config_msa(struct dp_catalog *dp_catalog,
dp_write_p0(catalog, MMSS_DP_DSC_DTO, 0x0);
}
-int dp_catalog_ctrl_set_pattern(struct dp_catalog *dp_catalog,
- u32 pattern)
+int dp_catalog_ctrl_set_pattern_state_bit(struct dp_catalog *dp_catalog,
+ u32 state_bit)
{
int bit, ret;
u32 data;
struct dp_catalog_private *catalog = container_of(dp_catalog,
struct dp_catalog_private, dp_catalog);
- bit = BIT(pattern - 1);
- DRM_DEBUG_DP("hw: bit=%d train=%d\n", bit, pattern);
+ bit = BIT(state_bit - 1);
+ DRM_DEBUG_DP("hw: bit=%d train=%d\n", bit, state_bit);
dp_catalog_ctrl_state_ctrl(dp_catalog, bit);
- bit = BIT(pattern - 1) << DP_MAINLINK_READY_LINK_TRAINING_SHIFT;
+ bit = BIT(state_bit - 1) << DP_MAINLINK_READY_LINK_TRAINING_SHIFT;
/* Poll for mainlink ready status */
ret = readx_poll_timeout(readl, catalog->io->dp_controller.link.base +
@@ -476,7 +476,7 @@ int dp_catalog_ctrl_set_pattern(struct dp_catalog *dp_catalog,
data, data & bit,
POLLING_SLEEP_US, POLLING_TIMEOUT_US);
if (ret < 0) {
- DRM_ERROR("set pattern for link_train=%d failed\n", pattern);
+ DRM_ERROR("set state_bit for link_train=%d failed\n", state_bit);
return ret;
}
return 0;
diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.h b/drivers/gpu/drm/msm/dp/dp_catalog.h
index 6965afa..7dea101 100644
--- a/drivers/gpu/drm/msm/dp/dp_catalog.h
+++ b/drivers/gpu/drm/msm/dp/dp_catalog.h
@@ -94,7 +94,7 @@ void dp_catalog_ctrl_mainlink_ctrl(struct dp_catalog *dp_catalog, bool enable);
void dp_catalog_ctrl_config_misc(struct dp_catalog *dp_catalog, u32 cc, u32 tb);
void dp_catalog_ctrl_config_msa(struct dp_catalog *dp_catalog, u32 rate,
u32 stream_rate_khz, bool fixed_nvid);
-int dp_catalog_ctrl_set_pattern(struct dp_catalog *dp_catalog, u32 pattern);
+int dp_catalog_ctrl_set_pattern_state_bit(struct dp_catalog *dp_catalog, u32 pattern);
void dp_catalog_ctrl_reset(struct dp_catalog *dp_catalog);
bool dp_catalog_ctrl_mainlink_ready(struct dp_catalog *dp_catalog);
void dp_catalog_ctrl_enable_irq(struct dp_catalog *dp_catalog, bool enable);
diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
index 9c80b49..f98df93 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
@@ -1083,7 +1083,7 @@ static int dp_ctrl_link_train_1(struct dp_ctrl_private *ctrl,
*training_step = DP_TRAINING_1;
- ret = dp_catalog_ctrl_set_pattern(ctrl->catalog, DP_TRAINING_PATTERN_1);
+ ret = dp_catalog_ctrl_set_pattern_state_bit(ctrl->catalog, 1);
if (ret)
return ret;
dp_ctrl_train_pattern_set(ctrl, DP_TRAINING_PATTERN_1 |
@@ -1181,7 +1181,8 @@ static int dp_ctrl_link_train_2(struct dp_ctrl_private *ctrl,
int *training_step)
{
int tries = 0, ret = 0;
- char pattern;
+ u8 pattern;
+ u32 state_ctrl_bit;
int const maximum_retries = 5;
u8 link_status[DP_LINK_STATUS_SIZE];
@@ -1189,12 +1190,18 @@ static int dp_ctrl_link_train_2(struct dp_ctrl_private *ctrl,
*training_step = DP_TRAINING_2;
- if (drm_dp_tps3_supported(ctrl->panel->dpcd))
+ if (drm_dp_tps4_supported(ctrl->panel->dpcd)) {
+ pattern = DP_TRAINING_PATTERN_4;
+ state_ctrl_bit = 4;
+ } else if (drm_dp_tps3_supported(ctrl->panel->dpcd)) {
pattern = DP_TRAINING_PATTERN_3;
- else
+ state_ctrl_bit = 3;
+ } else {
pattern = DP_TRAINING_PATTERN_2;
+ state_ctrl_bit = 2;
+ }
- ret = dp_catalog_ctrl_set_pattern(ctrl->catalog, pattern);
+ ret = dp_catalog_ctrl_set_pattern_state_bit(ctrl->catalog, state_ctrl_bit);
if (ret)
return ret;
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
Current DP drivers have regulators, clocks, irq and phy are grouped
together within a function and executed not in a symmetric manner.
This increase difficulty of code maintenance and limited code scalability.
This patch divides the driver life cycle of operation into four states,
resume (including booting up), dongle plugin, dongle unplugged and suspend.
Regulators, core clocks and irq are grouped together and enabled at resume
(or booting up) so that the DP controller is armed and ready to receive HPD
plugin interrupts. HPD plugin interrupt is generated when a dongle plugs
into DUT (device under test). Once HPD plugin interrupt is received, DP
controller will initialize phy so that dpcd read/write will function and
following link training can be proceeded successfully. DP phy will be
disabled after main link is teared down at end of unplugged HPD interrupt
handle triggered by dongle unplugged out of DUT. Finally regulators, code
clocks and irq are disabled at corresponding suspension.
Changes in V2:
-- removed unnecessary dp_ctrl NULL check
-- removed unnecessary phy init_count and power_count DRM_DEBUG_DP logs
-- remove flip parameter out of dp_ctrl_irq_enable()
-- add fixes tag
Changes in V3:
-- call dp_display_host_phy_init() instead of dp_ctrl_phy_init() at
dp_display_host_init() for eDP
Changes in V4:
-- rewording commit text to match this commit changes
Changes in V5:
-- rebase on top of msm-next branch
Changes in V6:
-- delete flip variable
Changes in V7:
-- dp_ctrl_irq_enable/disabe() merged into dp_ctrl_reset_irq_ctrl()
Changes in V8:
-- add more detail comment regrading dp phy at dp_display_host_init()
Changes in V9:
-- remove set phy_initialized to false when -ECONNRESET detected
Changes in v10:
-- group into one series
Changes in v11:
-- drop drm/msm/dp: dp_link_parse_sink_count() return immediately
if aux read
Changes in v12:
-- move dp_display_host_phy_exit() after dp_display_host_deinit()
Changes in v13:
-- do not execute phy_init until plugged_in interrupt for edp, same as DP.
Changes in v14:
-- remove redundant dp->core_initialized = false form dp_pm_suspend.
Changes in v15:
-- remove core_initialized flag check at both host_init and host_deinit
Fixes: 8ede2ecc3e5e ("drm/msm/dp: Add DP compliance tests on Snapdragon Chipsets")
Signed-off-by: Kuogee Hsieh <[email protected]>
---
drivers/gpu/drm/msm/dp/dp_ctrl.c | 80 +++++++++++------------------
drivers/gpu/drm/msm/dp/dp_ctrl.h | 8 +--
drivers/gpu/drm/msm/dp/dp_display.c | 100 ++++++++++++++++++++----------------
3 files changed, 91 insertions(+), 97 deletions(-)
diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
index c724cb0..9c80b49 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
@@ -1365,60 +1365,44 @@ static int dp_ctrl_enable_stream_clocks(struct dp_ctrl_private *ctrl)
return ret;
}
-int dp_ctrl_host_init(struct dp_ctrl *dp_ctrl, bool flip, bool reset)
+void dp_ctrl_reset_irq_ctrl(struct dp_ctrl *dp_ctrl, bool enable)
+{
+ struct dp_ctrl_private *ctrl;
+
+ ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
+
+ dp_catalog_ctrl_reset(ctrl->catalog);
+
+ if (enable)
+ dp_catalog_ctrl_enable_irq(ctrl->catalog, enable);
+}
+
+void dp_ctrl_phy_init(struct dp_ctrl *dp_ctrl)
{
struct dp_ctrl_private *ctrl;
struct dp_io *dp_io;
struct phy *phy;
- if (!dp_ctrl) {
- DRM_ERROR("Invalid input data\n");
- return -EINVAL;
- }
-
ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
dp_io = &ctrl->parser->io;
phy = dp_io->phy;
- ctrl->dp_ctrl.orientation = flip;
-
- if (reset)
- dp_catalog_ctrl_reset(ctrl->catalog);
-
- DRM_DEBUG_DP("flip=%d\n", flip);
dp_catalog_ctrl_phy_reset(ctrl->catalog);
phy_init(phy);
- dp_catalog_ctrl_enable_irq(ctrl->catalog, true);
-
- return 0;
}
-/**
- * dp_ctrl_host_deinit() - Uninitialize DP controller
- * @dp_ctrl: Display Port Driver data
- *
- * Perform required steps to uninitialize DP controller
- * and its resources.
- */
-void dp_ctrl_host_deinit(struct dp_ctrl *dp_ctrl)
+void dp_ctrl_phy_exit(struct dp_ctrl *dp_ctrl)
{
struct dp_ctrl_private *ctrl;
struct dp_io *dp_io;
struct phy *phy;
- if (!dp_ctrl) {
- DRM_ERROR("Invalid input data\n");
- return;
- }
-
ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
dp_io = &ctrl->parser->io;
phy = dp_io->phy;
- dp_catalog_ctrl_enable_irq(ctrl->catalog, false);
+ dp_catalog_ctrl_phy_reset(ctrl->catalog);
phy_exit(phy);
-
- DRM_DEBUG_DP("Host deinitialized successfully\n");
}
static bool dp_ctrl_use_fixed_nvid(struct dp_ctrl_private *ctrl)
@@ -1488,7 +1472,10 @@ static int dp_ctrl_deinitialize_mainlink(struct dp_ctrl_private *ctrl)
}
phy_power_off(phy);
+
+ /* aux channel down, reinit phy */
phy_exit(phy);
+ phy_init(phy);
return 0;
}
@@ -1893,8 +1880,14 @@ int dp_ctrl_off_link_stream(struct dp_ctrl *dp_ctrl)
return ret;
}
+ DRM_DEBUG_DP("Before, phy=%x init_count=%d power_on=%d\n",
+ (u32)(uintptr_t)phy, phy->init_count, phy->power_count);
+
phy_power_off(phy);
+ DRM_DEBUG_DP("After, phy=%x init_count=%d power_on=%d\n",
+ (u32)(uintptr_t)phy, phy->init_count, phy->power_count);
+
/* aux channel down, reinit phy */
phy_exit(phy);
phy_init(phy);
@@ -1903,23 +1896,6 @@ int dp_ctrl_off_link_stream(struct dp_ctrl *dp_ctrl)
return ret;
}
-void dp_ctrl_off_phy(struct dp_ctrl *dp_ctrl)
-{
- struct dp_ctrl_private *ctrl;
- struct dp_io *dp_io;
- struct phy *phy;
-
- ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
- dp_io = &ctrl->parser->io;
- phy = dp_io->phy;
-
- dp_catalog_ctrl_reset(ctrl->catalog);
-
- phy_exit(phy);
-
- DRM_DEBUG_DP("DP off phy done\n");
-}
-
int dp_ctrl_off(struct dp_ctrl *dp_ctrl)
{
struct dp_ctrl_private *ctrl;
@@ -1947,10 +1923,14 @@ int dp_ctrl_off(struct dp_ctrl *dp_ctrl)
DRM_ERROR("Failed to disable link clocks. ret=%d\n", ret);
}
+ DRM_DEBUG_DP("Before, phy=%x init_count=%d power_on=%d\n",
+ (u32)(uintptr_t)phy, phy->init_count, phy->power_count);
+
phy_power_off(phy);
- phy_exit(phy);
- DRM_DEBUG_DP("DP off done\n");
+ DRM_DEBUG_DP("After, phy=%x init_count=%d power_on=%d\n",
+ (u32)(uintptr_t)phy, phy->init_count, phy->power_count);
+
return ret;
}
diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.h b/drivers/gpu/drm/msm/dp/dp_ctrl.h
index 2363a2d..2433edb 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.h
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.h
@@ -19,12 +19,9 @@ struct dp_ctrl {
u32 pixel_rate;
};
-int dp_ctrl_host_init(struct dp_ctrl *dp_ctrl, bool flip, bool reset);
-void dp_ctrl_host_deinit(struct dp_ctrl *dp_ctrl);
int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl);
int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl);
int dp_ctrl_off_link_stream(struct dp_ctrl *dp_ctrl);
-void dp_ctrl_off_phy(struct dp_ctrl *dp_ctrl);
int dp_ctrl_off(struct dp_ctrl *dp_ctrl);
void dp_ctrl_push_idle(struct dp_ctrl *dp_ctrl);
void dp_ctrl_isr(struct dp_ctrl *dp_ctrl);
@@ -34,4 +31,9 @@ struct dp_ctrl *dp_ctrl_get(struct device *dev, struct dp_link *link,
struct dp_power *power, struct dp_catalog *catalog,
struct dp_parser *parser);
+void dp_ctrl_reset_irq_ctrl(struct dp_ctrl *dp_ctrl, bool enable);
+void dp_ctrl_phy_init(struct dp_ctrl *dp_ctrl);
+void dp_ctrl_phy_exit(struct dp_ctrl *dp_ctrl);
+void dp_ctrl_irq_phy_exit(struct dp_ctrl *dp_ctrl);
+
#endif /* _DP_CTRL_H_ */
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 7cc4d21..7cd6222 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -83,6 +83,7 @@ struct dp_display_private {
/* state variables */
bool core_initialized;
+ bool phy_initialized;
bool hpd_irq_on;
bool audio_supported;
@@ -372,36 +373,45 @@ static int dp_display_process_hpd_high(struct dp_display_private *dp)
return rc;
}
-static void dp_display_host_init(struct dp_display_private *dp, int reset)
+static void dp_display_host_phy_init(struct dp_display_private *dp)
{
- bool flip = false;
+ DRM_DEBUG_DP("core_init=%d phy_init=%d\n",
+ dp->core_initialized, dp->phy_initialized);
- DRM_DEBUG_DP("core_initialized=%d\n", dp->core_initialized);
- if (dp->core_initialized) {
- DRM_DEBUG_DP("DP core already initialized\n");
- return;
+ if (!dp->phy_initialized) {
+ dp_ctrl_phy_init(dp->ctrl);
+ dp->phy_initialized = true;
+ }
+}
+
+static void dp_display_host_phy_exit(struct dp_display_private *dp)
+{
+ DRM_DEBUG_DP("core_init=%d phy_init=%d\n",
+ dp->core_initialized, dp->phy_initialized);
+
+ if (dp->phy_initialized) {
+ dp_ctrl_phy_exit(dp->ctrl);
+ dp->phy_initialized = false;
}
+}
- if (dp->usbpd->orientation == ORIENTATION_CC2)
- flip = true;
+static void dp_display_host_init(struct dp_display_private *dp)
+{
+ DRM_DEBUG_DP("core_initialized=%d\n", dp->core_initialized);
- dp_power_init(dp->power, flip);
- dp_ctrl_host_init(dp->ctrl, flip, reset);
+ dp_power_init(dp->power, false);
+ dp_ctrl_reset_irq_ctrl(dp->ctrl, true);
dp_aux_init(dp->aux);
dp->core_initialized = true;
}
static void dp_display_host_deinit(struct dp_display_private *dp)
{
- if (!dp->core_initialized) {
- DRM_DEBUG_DP("DP core not initialized\n");
- return;
- }
+ DRM_DEBUG_DP("core_initialized=%d\n", dp->core_initialized);
- dp_ctrl_host_deinit(dp->ctrl);
+ dp_ctrl_reset_irq_ctrl(dp->ctrl, false);
dp_aux_deinit(dp->aux);
dp_power_deinit(dp->power);
-
dp->core_initialized = false;
}
@@ -409,7 +419,7 @@ static int dp_display_usbpd_configure_cb(struct device *dev)
{
struct dp_display_private *dp = dev_get_dp_display_private(dev);
- dp_display_host_init(dp, false);
+ dp_display_host_phy_init(dp);
return dp_display_process_hpd_high(dp);
}
@@ -530,11 +540,6 @@ static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
ret = dp_display_usbpd_configure_cb(&dp->pdev->dev);
if (ret) { /* link train failed */
dp->hpd_state = ST_DISCONNECTED;
-
- if (ret == -ECONNRESET) { /* cable unplugged */
- dp->core_initialized = false;
- }
-
} else {
/* start sentinel checking in case of missing uevent */
dp_add_event(dp, EV_CONNECT_PENDING_TIMEOUT, 0, tout);
@@ -604,8 +609,7 @@ static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
if (state == ST_DISCONNECTED) {
/* triggered by irq_hdp with sink_count = 0 */
if (dp->link->sink_count == 0) {
- dp_ctrl_off_phy(dp->ctrl);
- dp->core_initialized = false;
+ dp_display_host_phy_exit(dp);
}
mutex_unlock(&dp->event_mutex);
return 0;
@@ -667,7 +671,6 @@ static int dp_disconnect_pending_timeout(struct dp_display_private *dp, u32 data
static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data)
{
u32 state;
- int ret;
mutex_lock(&dp->event_mutex);
@@ -696,12 +699,9 @@ static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data)
* dp core (ahb/aux clks) must be initialized before
* irq_hpd be handled
*/
- if (dp->core_initialized) {
- ret = dp_display_usbpd_attention_cb(&dp->pdev->dev);
- if (ret == -ECONNRESET) { /* cable unplugged */
- dp->core_initialized = false;
- }
- }
+ if (dp->core_initialized)
+ dp_display_usbpd_attention_cb(&dp->pdev->dev);
+
DRM_DEBUG_DP("hpd_state=%d\n", state);
mutex_unlock(&dp->event_mutex);
@@ -892,12 +892,19 @@ static int dp_display_disable(struct dp_display_private *dp, u32 data)
dp_display->audio_enabled = false;
- /* triggered by irq_hpd with sink_count = 0 */
if (dp->link->sink_count == 0) {
+ /*
+ * irq_hpd with sink_count = 0
+ * hdmi unplugged out of dongle
+ */
dp_ctrl_off_link_stream(dp->ctrl);
} else {
+ /*
+ * unplugged interrupt
+ * dongle unplugged out of DUT
+ */
dp_ctrl_off(dp->ctrl);
- dp->core_initialized = false;
+ dp_display_host_phy_exit(dp);
}
dp_display->power_on = false;
@@ -1027,7 +1034,7 @@ void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp)
static void dp_display_config_hpd(struct dp_display_private *dp)
{
- dp_display_host_init(dp, true);
+ dp_display_host_init(dp);
dp_catalog_ctrl_hpd_config(dp->catalog);
/* Enable interrupt first time
@@ -1306,20 +1313,23 @@ static int dp_pm_resume(struct device *dev)
dp->hpd_state = ST_DISCONNECTED;
/* turn on dp ctrl/phy */
- dp_display_host_init(dp, true);
+ dp_display_host_init(dp);
dp_catalog_ctrl_hpd_config(dp->catalog);
- /*
- * set sink to normal operation mode -- D0
- * before dpcd read
- */
- dp_link_psm_config(dp->link, &dp->panel->link_info, false);
if (dp_catalog_link_is_connected(dp->catalog)) {
+ /*
+ * set sink to normal operation mode -- D0
+ * before dpcd read
+ */
+ dp_display_host_phy_init(dp);
+ dp_link_psm_config(dp->link, &dp->panel->link_info, false);
sink_count = drm_dp_read_sink_count(dp->aux);
if (sink_count < 0)
sink_count = 0;
+
+ dp_display_host_phy_exit(dp);
}
dp->link->sink_count = sink_count;
@@ -1363,14 +1373,16 @@ static int dp_pm_suspend(struct device *dev)
if (dp_power_clk_status(dp->power, DP_CTRL_PM))
dp_ctrl_off_link_stream(dp->ctrl);
+ dp_display_host_phy_exit(dp);
+
+ /* host_init will be called at pm_resume */
dp_display_host_deinit(dp);
+ } else {
+ dp_display_host_phy_exit(dp);
}
dp->hpd_state = ST_SUSPENDED;
- /* host_init will be called at pm_resume */
- dp->core_initialized = false;
-
DRM_DEBUG_DP("After, core_inited=%d power_on=%d\n",
dp->core_initialized, dp_display->power_on);
@@ -1535,7 +1547,7 @@ int msm_dp_display_enable(struct msm_dp *dp, struct drm_encoder *encoder)
state = dp_display->hpd_state;
if (state == ST_DISPLAY_OFF)
- dp_display_host_init(dp_display, true);
+ dp_display_host_phy_init(dp_display);
dp_display_enable(dp_display, 0);
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
DP CTS test case 4.2.2.6 has valid edid with bad checksum on purpose
and expect DP source return correct checksum. During drm edid read,
correct edid checksum is calculated and stored at
connector::real_edid_checksum.
The problem is struct dp_panel::connector never be assigned, instead the
connector is stored in struct msm_dp::connector. When we run compliance
testing test case 4.2.2.6 dp_panel_handle_sink_request() won't have a valid
edid set in struct dp_panel::edid so we'll try to use the connectors
real_edid_checksum and hit a NULL pointer dereference error because the
connector pointer is never assigned.
Changes in V2:
-- populate panel connector at msm_dp_modeset_init() instead of at dp_panel_read_sink_caps()
Changes in V3:
-- remove unhelpful kernel crash trace commit text
-- remove renaming dp_display parameter to dp
Changes in V4:
-- add more details to commit text
Changes in v10:
-- group into one series
Changes in v11:
-- drop drm/msm/dp: dp_link_parse_sink_count() return immediately if aux read
Fixes: 7948fe12d47 ("drm/msm/dp: return correct edid checksum after corrupted edid checksum read")
Signee-off-by: Kuogee Hsieh <[email protected]>
Reviewed-by: Bjorn Andersson <[email protected]>
Reviewed-by: Stephen Boyd <[email protected]>
---
drivers/gpu/drm/msm/dp/dp_display.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 7cd6222..2dbbbe84 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -1472,6 +1472,7 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
struct drm_encoder *encoder)
{
struct msm_drm_private *priv;
+ struct dp_display_private *dp_priv;
int ret;
if (WARN_ON(!encoder) || WARN_ON(!dp_display) || WARN_ON(!dev))
@@ -1480,6 +1481,8 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
priv = dev->dev_private;
dp_display->drm_dev = dev;
+ dp_priv = container_of(dp_display, struct dp_display_private, dp_display);
+
ret = dp_display_request_irq(dp_display);
if (ret) {
DRM_ERROR("request_irq failed, ret=%d\n", ret);
@@ -1497,6 +1500,8 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
return ret;
}
+ dp_priv->panel->connector = dp_display->connector;
+
priv->connectors[priv->num_connectors++] = dp_display->connector;
dp_display->bridge = msm_dp_bridge_init(dp_display, dev, encoder);
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
Each DP link training contains link training 1 followed by link
training 2. There is maximum of 5 retries of DP link training
before declared link training failed. It is required to stop link
training at end of link training 2 if it is failed so that next
link training 1 can start freshly. This patch fixes link compliance
test case 4.3.1.13 (Source Device Link Training EQ Fallback Test).
Changes in v10:
-- group into one series
Changes in v11:
-- drop drm/msm/dp: dp_link_parse_sink_count() return immediately if aux read
Fixes: 2e0adc765d88 ("drm/msm/dp: do not end dp link training until video is ready")
Signed-off-by: Kuogee Hsieh <[email protected]>
Reviewed-by: Stephen Boyd <[email protected]>
---
drivers/gpu/drm/msm/dp/dp_ctrl.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
index f98df93..245e1b9 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
@@ -1755,6 +1755,9 @@ int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl)
/* end with failure */
break; /* lane == 1 already */
}
+
+ /* stop link training before start re training */
+ dp_ctrl_clear_training_pattern(ctrl);
}
}
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
Quoting Kuogee Hsieh (2022-01-14 13:11:47)
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index 7cc4d21..7cd6222 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -696,12 +699,9 @@ static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data)
> * dp core (ahb/aux clks) must be initialized before
> * irq_hpd be handled
> */
> - if (dp->core_initialized) {
> - ret = dp_display_usbpd_attention_cb(&dp->pdev->dev);
> - if (ret == -ECONNRESET) { /* cable unplugged */
> - dp->core_initialized = false;
> - }
> - }
> + if (dp->core_initialized)
When is this condition false? The irq isn't unmasked until the core has
been initialized. On the resume path I suppose the irq is enabled in
dp_display_host_init() calling dp_ctrl_reset_irq_ctrl(), and then we
could immediately get the interrupt but it will block on the event_mutex
lock.
> + dp_display_usbpd_attention_cb(&dp->pdev->dev);
> +
> DRM_DEBUG_DP("hpd_state=%d\n", state);
>
> mutex_unlock(&dp->event_mutex);
> @@ -1363,14 +1373,16 @@ static int dp_pm_suspend(struct device *dev)
> if (dp_power_clk_status(dp->power, DP_CTRL_PM))
> dp_ctrl_off_link_stream(dp->ctrl);
>
> + dp_display_host_phy_exit(dp);
> +
> + /* host_init will be called at pm_resume */
> dp_display_host_deinit(dp);
> + } else {
> + dp_display_host_phy_exit(dp);
I fail to see where this condition happens. Can we suspend the device
without the irq being installed?
> }
>
> dp->hpd_state = ST_SUSPENDED;
>
> - /* host_init will be called at pm_resume */
> - dp->core_initialized = false;
> -
> DRM_DEBUG_DP("After, core_inited=%d power_on=%d\n",
> dp->core_initialized, dp_display->power_on);
>
On 1/14/2022 1:41 PM, Stephen Boyd wrote:
> Quoting Kuogee Hsieh (2022-01-14 13:11:47)
>> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
>> index 7cc4d21..7cd6222 100644
>> --- a/drivers/gpu/drm/msm/dp/dp_display.c
>> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
>> @@ -696,12 +699,9 @@ static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data)
>> * dp core (ahb/aux clks) must be initialized before
>> * irq_hpd be handled
>> */
>> - if (dp->core_initialized) {
>> - ret = dp_display_usbpd_attention_cb(&dp->pdev->dev);
>> - if (ret == -ECONNRESET) { /* cable unplugged */
>> - dp->core_initialized = false;
>> - }
>> - }
>> + if (dp->core_initialized)
> When is this condition false? The irq isn't unmasked until the core has
> been initialized. On the resume path I suppose the irq is enabled in
> dp_display_host_init() calling dp_ctrl_reset_irq_ctrl(), and then we
> could immediately get the interrupt but it will block on the event_mutex
> lock.
This is left over form Lazor.
I remember that there is an extreme case that several irq_hpd interrupts
happen right after dongle plug in (happen at resume too) and sometime
cause system crash at dpcd read due to AHB clock is not enabled yet. It
took some time to debug it.
From looking into code, it does not look likely it will happen. But it
did happen at real world.
So that I would like to keep this condition checking.
>> + dp_display_usbpd_attention_cb(&dp->pdev->dev);
>> +
>> DRM_DEBUG_DP("hpd_state=%d\n", state);
>>
>> mutex_unlock(&dp->event_mutex);
>> @@ -1363,14 +1373,16 @@ static int dp_pm_suspend(struct device *dev)
>> if (dp_power_clk_status(dp->power, DP_CTRL_PM))
>> dp_ctrl_off_link_stream(dp->ctrl);
>>
>> + dp_display_host_phy_exit(dp);
>> +
>> + /* host_init will be called at pm_resume */
>> dp_display_host_deinit(dp);
>> + } else {
>> + dp_display_host_phy_exit(dp);
> I fail to see where this condition happens. Can we suspend the device
> without the irq being installed?
Agree, with this new mechanism it should not happen.
Will remove it.
>> }
>>
>> dp->hpd_state = ST_SUSPENDED;
>>
>> - /* host_init will be called at pm_resume */
>> - dp->core_initialized = false;
>> -
>> DRM_DEBUG_DP("After, core_inited=%d power_on=%d\n",
>> dp->core_initialized, dp_display->power_on);
>>
Quoting Kuogee Hsieh (2022-01-14 14:28:52)
>
> On 1/14/2022 1:41 PM, Stephen Boyd wrote:
> > Quoting Kuogee Hsieh (2022-01-14 13:11:47)
> >> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> >> index 7cc4d21..7cd6222 100644
> >> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> >> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> >> @@ -696,12 +699,9 @@ static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data)
> >> * dp core (ahb/aux clks) must be initialized before
> >> * irq_hpd be handled
> >> */
> >> - if (dp->core_initialized) {
> >> - ret = dp_display_usbpd_attention_cb(&dp->pdev->dev);
> >> - if (ret == -ECONNRESET) { /* cable unplugged */
> >> - dp->core_initialized = false;
> >> - }
> >> - }
> >> + if (dp->core_initialized)
> > When is this condition false? The irq isn't unmasked until the core has
> > been initialized. On the resume path I suppose the irq is enabled in
> > dp_display_host_init() calling dp_ctrl_reset_irq_ctrl(), and then we
> > could immediately get the interrupt but it will block on the event_mutex
> > lock.
>
> This is left over form Lazor.
>
> I remember that there is an extreme case that several irq_hpd interrupts
> happen right after dongle plug in (happen at resume too) and sometime
> cause system crash at dpcd read due to AHB clock is not enabled yet. It
> took some time to debug it.
>
> From looking into code, it does not look likely it will happen. But it
> did happen at real world.
How does it happen after this patch is applied? I remember the duplicate
irq_hpd problem but that should have been solved by de-duplicating the
irq in the hardware by leaving it pending until it was handled. Note,
I'm not suggesting we remove the enabling of the core, just the check
that the core is initialized. Now that the check for core_initialized is
removed from the init function we have to make sure we only call the
function one time to match what was there before.
>
> So that I would like to keep this condition checking.
I'd rather not leave around dead code in this driver. The sharp edges
are what we need to smooth out.