2022-01-11 09:06:52

by Xin Ji

Subject: [PATCH v3 1/1] drm/bridge: anx7625: send DPCD command to downstream

Send DPCD command to downstream before anx7625 power down,
let downstream monitor enter into standby mode.

Signed-off-by: Xin Ji <[email protected]>
---
drivers/gpu/drm/bridge/analogix/anx7625.c | 42 +++++++++++++++++++----
1 file changed, 35 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 33383f83255d..0b858c78abe8 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -129,6 +129,23 @@ static int anx7625_reg_write(struct anx7625_data *ctx,
return ret;
}

+static int anx7625_reg_block_write(struct anx7625_data *ctx,
+ struct i2c_client *client,
+ u8 reg_addr, u8 len, u8 *buf)
+{
+ int ret;
+ struct device *dev = &client->dev;
+
+ i2c_access_workaround(ctx, client);
+
+ ret = i2c_smbus_write_i2c_block_data(client, reg_addr, len, buf);
+ if (ret < 0)
+ dev_err(dev, "write i2c block failed id=%x\n:%x",
+ client->addr, reg_addr);
+
+ return ret;
+}
+
static int anx7625_write_or(struct anx7625_data *ctx,
struct i2c_client *client,
u8 offset, u8 mask)
@@ -214,8 +231,8 @@ static int wait_aux_op_finish(struct anx7625_data *ctx)
return 0;
}

-static int anx7625_aux_dpcd_read(struct anx7625_data *ctx,
- u32 address, u8 len, u8 *buf)
+static int anx7625_aux_dpcd_trans(struct anx7625_data *ctx, u8 op,
+ u32 address, u8 len, u8 *buf)
{
struct device *dev = &ctx->client->dev;
int ret;
@@ -231,8 +248,7 @@ static int anx7625_aux_dpcd_read(struct anx7625_data *ctx,
addrm = (address >> 8) & 0xFF;
addrh = (address >> 16) & 0xFF;

- cmd = DPCD_CMD(len, DPCD_READ);
- cmd = ((len - 1) << 4) | 0x09;
+ cmd = DPCD_CMD(len, op);

/* Set command and length */
ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
@@ -246,6 +262,9 @@ static int anx7625_aux_dpcd_read(struct anx7625_data *ctx,
ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
AP_AUX_ADDR_19_16, addrh);

+ if (op == DPCD_WRITE)
+ ret |= anx7625_reg_block_write(ctx, ctx->i2c.rx_p0_client,
+ AP_AUX_BUFF_START, len, buf);
/* Enable aux access */
ret |= anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
AP_AUX_CTRL_STATUS, AP_AUX_CTRL_OP_EN);
@@ -255,14 +274,17 @@ static int anx7625_aux_dpcd_read(struct anx7625_data *ctx,
return -EIO;
}

- usleep_range(2000, 2100);
-
ret = wait_aux_op_finish(ctx);
if (ret) {
dev_err(dev, "aux IO error: wait aux op finish.\n");
return ret;
}

+ /* Write done */
+ if (op == DPCD_WRITE)
+ return 0;
+
+ /* Read done, read out dpcd data */
ret = anx7625_reg_block_read(ctx, ctx->i2c.rx_p0_client,
AP_AUX_BUFF_START, len, buf);
if (ret < 0) {
@@ -845,7 +867,7 @@ static int anx7625_hdcp_enable(struct anx7625_data *ctx)
}

/* Read downstream capability */
- anx7625_aux_dpcd_read(ctx, 0x68028, 1, &bcap);
+ anx7625_aux_dpcd_trans(ctx, DPCD_READ, 0x68028, 1, &bcap);
if (!(bcap & 0x01)) {
pr_warn("downstream not support HDCP 1.4, cap(%x).\n", bcap);
return 0;
@@ -918,6 +940,7 @@ static void anx7625_dp_stop(struct anx7625_data *ctx)
{
struct device *dev = &ctx->client->dev;
int ret;
+ u8 data;

DRM_DEV_DEBUG_DRIVER(dev, "stop dp output\n");

@@ -929,6 +952,11 @@ static void anx7625_dp_stop(struct anx7625_data *ctx)
ret |= anx7625_write_and(ctx, ctx->i2c.tx_p2_client, 0x08, 0x7f);

ret |= anx7625_video_mute_control(ctx, 1);
+
+ dev_dbg(dev, "notify downstream enter into standby\n");
+ /* Downstream monitor enter into standby mode */
+ data = 2;
+ ret |= anx7625_aux_dpcd_trans(ctx, DPCD_WRITE, 0x000600, 1, &data);
if (ret < 0)
DRM_DEV_ERROR(dev, "IO error : mute video fail\n");

--
2.25.1

2022-01-17 17:07:33

by Hsin-Yi Wang

Subject: Re: [PATCH v3 1/1] drm/bridge: anx7625: send DPCD command to downstream

On Tue, Jan 11, 2022 at 5:06 PM Xin Ji <[email protected]> wrote:
>
> Send DPCD command to downstream before anx7625 power down,
> let downstream monitor enter into standby mode.
>
> Signed-off-by: Xin Ji <[email protected]>
> ---
> drivers/gpu/drm/bridge/analogix/anx7625.c | 42 +++++++++++++++++++----
> 1 file changed, 35 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
> index 33383f83255d..0b858c78abe8 100644
> --- a/drivers/gpu/drm/bridge/analogix/anx7625.c
> +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
> @@ -129,6 +129,23 @@ static int anx7625_reg_write(struct anx7625_data *ctx,
> return ret;
> }
>
> +static int anx7625_reg_block_write(struct anx7625_data *ctx,
> + struct i2c_client *client,
> + u8 reg_addr, u8 len, u8 *buf)
> +{
> + int ret;
> + struct device *dev = &client->dev;
> +
> + i2c_access_workaround(ctx, client);
> +
> + ret = i2c_smbus_write_i2c_block_data(client, reg_addr, len, buf);
> + if (ret < 0)
> + dev_err(dev, "write i2c block failed id=%x\n:%x",
> + client->addr, reg_addr);
> +
> + return ret;
> +}
> +
> static int anx7625_write_or(struct anx7625_data *ctx,
> struct i2c_client *client,
> u8 offset, u8 mask)
> @@ -214,8 +231,8 @@ static int wait_aux_op_finish(struct anx7625_data *ctx)
> return 0;
> }
>
> -static int anx7625_aux_dpcd_read(struct anx7625_data *ctx,
> - u32 address, u8 len, u8 *buf)
> +static int anx7625_aux_dpcd_trans(struct anx7625_data *ctx, u8 op,
> + u32 address, u8 len, u8 *buf)
> {
> struct device *dev = &ctx->client->dev;
> int ret;
> @@ -231,8 +248,7 @@ static int anx7625_aux_dpcd_read(struct anx7625_data *ctx,
> addrm = (address >> 8) & 0xFF;
> addrh = (address >> 16) & 0xFF;
>
> - cmd = DPCD_CMD(len, DPCD_READ);
> - cmd = ((len - 1) << 4) | 0x09;
> + cmd = DPCD_CMD(len, op);
>
> /* Set command and length */
> ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
> @@ -246,6 +262,9 @@ static int anx7625_aux_dpcd_read(struct anx7625_data *ctx,
> ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
> AP_AUX_ADDR_19_16, addrh);
>
> + if (op == DPCD_WRITE)
> + ret |= anx7625_reg_block_write(ctx, ctx->i2c.rx_p0_client,
> + AP_AUX_BUFF_START, len, buf);
> /* Enable aux access */
> ret |= anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
> AP_AUX_CTRL_STATUS, AP_AUX_CTRL_OP_EN);
> @@ -255,14 +274,17 @@ static int anx7625_aux_dpcd_read(struct anx7625_data *ctx,
> return -EIO;
> }
>
> - usleep_range(2000, 2100);
> -
> ret = wait_aux_op_finish(ctx);
> if (ret) {
> dev_err(dev, "aux IO error: wait aux op finish.\n");
> return ret;
> }
>
> + /* Write done */
> + if (op == DPCD_WRITE)
> + return 0;
> +
> + /* Read done, read out dpcd data */
> ret = anx7625_reg_block_read(ctx, ctx->i2c.rx_p0_client,
> AP_AUX_BUFF_START, len, buf);
> if (ret < 0) {
> @@ -845,7 +867,7 @@ static int anx7625_hdcp_enable(struct anx7625_data *ctx)
> }
>
> /* Read downstream capability */
> - anx7625_aux_dpcd_read(ctx, 0x68028, 1, &bcap);
> + anx7625_aux_dpcd_trans(ctx, DPCD_READ, 0x68028, 1, &bcap);
> if (!(bcap & 0x01)) {
> pr_warn("downstream not support HDCP 1.4, cap(%x).\n", bcap);
> return 0;
> @@ -918,6 +940,7 @@ static void anx7625_dp_stop(struct anx7625_data *ctx)
> {
> struct device *dev = &ctx->client->dev;
> int ret;
> + u8 data;
>
> DRM_DEV_DEBUG_DRIVER(dev, "stop dp output\n");
>
> @@ -929,6 +952,11 @@ static void anx7625_dp_stop(struct anx7625_data *ctx)
> ret |= anx7625_write_and(ctx, ctx->i2c.tx_p2_client, 0x08, 0x7f);
>
> ret |= anx7625_video_mute_control(ctx, 1);
> +
> + dev_dbg(dev, "notify downstream enter into standby\n");
> + /* Downstream monitor enter into standby mode */
> + data = 2;
> + ret |= anx7625_aux_dpcd_trans(ctx, DPCD_WRITE, 0x000600, 1, &data);

Is DPCD_READ/WRITE used for the same purpose as
DP_AUX_NATIVE_WRITE/READ? If so, maybe you can just use
DP_AUX_NATIVE_WRITE/READ and we don't need to define these values
again in the driver?

> if (ret < 0)
> DRM_DEV_ERROR(dev, "IO error : mute video fail\n");
>
> --
> 2.25.1
>