2022-01-25 00:09:53

by Kuogee Hsieh

Subject: [PATCH v2] drm/msm/dp: always add fail-safe mode into connector mode list

Some of DP link compliant test expects to return fail-safe mode
if prefer detailed timing mode can not be supported by mainlink's
lane and rate after link training. Therefore add fail-safe mode
into connector mode list as backup mode. This patch fixes test
case 4.2.2.1.

Changes in v2:
-- add Fixes text string

Fixes: 4b85d405cfe9 ( "drm/msm/dp: reduce link rate if failed at link training 1")
Signed-off-by: Kuogee Hsieh <[email protected]>
---
drivers/gpu/drm/msm/dp/dp_panel.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
index 71db10c..f141872 100644
--- a/drivers/gpu/drm/msm/dp/dp_panel.c
+++ b/drivers/gpu/drm/msm/dp/dp_panel.c
@@ -212,6 +212,11 @@ int dp_panel_read_sink_caps(struct dp_panel *dp_panel,
if (drm_add_modes_noedid(connector, 640, 480))
drm_set_preferred_mode(connector, 640, 480);
mutex_unlock(&connector->dev->mode_config.mutex);
+ } else {
+ /* always add fail-safe mode as backup mode */
+ mutex_lock(&connector->dev->mode_config.mutex);
+ drm_add_modes_noedid(connector, 640, 480);
+ mutex_unlock(&connector->dev->mode_config.mutex);
}

if (panel->aux_cfg_update_done) {
--
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2022-02-14 20:16:46

by Kuogee Hsieh

Subject: Re: [PATCH v2] drm/msm/dp: always add fail-safe mode into connector mode list

Hi Stephen,

Are you have more comments?


On 1/24/2022 3:17 PM, Kuogee Hsieh wrote:
> Some of DP link compliant test expects to return fail-safe mode
> if prefer detailed timing mode can not be supported by mainlink's
> lane and rate after link training. Therefore add fail-safe mode
> into connector mode list as backup mode. This patch fixes test
> case 4.2.2.1.
>
> Changes in v2:
> -- add Fixes text string
>
> Fixes: 4b85d405cfe9 ( "drm/msm/dp: reduce link rate if failed at link training 1")
> Signed-off-by: Kuogee Hsieh <[email protected]>
> ---
> drivers/gpu/drm/msm/dp/dp_panel.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
> index 71db10c..f141872 100644
> --- a/drivers/gpu/drm/msm/dp/dp_panel.c
> +++ b/drivers/gpu/drm/msm/dp/dp_panel.c
> @@ -212,6 +212,11 @@ int dp_panel_read_sink_caps(struct dp_panel *dp_panel,
> if (drm_add_modes_noedid(connector, 640, 480))
> drm_set_preferred_mode(connector, 640, 480);
> mutex_unlock(&connector->dev->mode_config.mutex);
> + } else {
> + /* always add fail-safe mode as backup mode */
> + mutex_lock(&connector->dev->mode_config.mutex);
> + drm_add_modes_noedid(connector, 640, 480);
> + mutex_unlock(&connector->dev->mode_config.mutex);
> }
>
> if (panel->aux_cfg_update_done) {

2022-02-16 19:56:37

by Stephen Boyd

Subject: Re: [PATCH v2] drm/msm/dp: always add fail-safe mode into connector mode list

Quoting Kuogee Hsieh (2022-01-24 15:17:54)
> Some of DP link compliant test expects to return fail-safe mode
> if prefer detailed timing mode can not be supported by mainlink's
> lane and rate after link training. Therefore add fail-safe mode
> into connector mode list as backup mode. This patch fixes test
> case 4.2.2.1.
>
> Changes in v2:
> -- add Fixes text string
>
> Fixes: 4b85d405cfe9 ( "drm/msm/dp: reduce link rate if failed at link training 1")
> Signed-off-by: Kuogee Hsieh <[email protected]>
> ---

Reviewed-by: Stephen Boyd <[email protected]>