diff mbox series

[v2,5/7] drm/msm/dp: return correct edid checksum after corrupted edid checksum read

Message ID 1626191647-13901-6-git-send-email-khsieh@codeaurora.org (mailing list archive)
State Superseded, archived
Headers show
Series add fixes to pass DP Link Layer compliance test cases | expand

Commit Message

Kuogee Hsieh July 13, 2021, 3:54 p.m. UTC 
Response with correct edid checksum saved at connector after corrupted edid
checksum read. This fixes Link Layer CTS cases 4.2.2.3, 4.2.2.6.

Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
---
 drivers/gpu/drm/msm/dp/dp_panel.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

Comments

Stephen Boyd July 22, 2021, 7:23 p.m. UTC | #1 
Quoting Kuogee Hsieh (2021-07-13 08:54:05)
> diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
> index 88196f7..0fdb551 100644
> --- a/drivers/gpu/drm/msm/dp/dp_panel.c
> +++ b/drivers/gpu/drm/msm/dp/dp_panel.c
> @@ -303,7 +303,12 @@ void dp_panel_handle_sink_request(struct dp_panel *dp_panel)
>         panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
>
>         if (panel->link->sink_request & DP_TEST_LINK_EDID_READ) {
> -               u8 checksum = dp_panel_get_edid_checksum(dp_panel->edid);
> +               u8 checksum;
> +
> +               if (dp_panel->edid)
> +                       checksum = dp_panel_get_edid_checksum(dp_panel->edid);
> +               else
> +                       checksum = dp_panel->connector->real_edid_checksum;

Is there any reason why we can't use connector->real_edid_checksum all
the time?

>
>                 dp_link_send_edid_checksum(panel->link, checksum);
>                 dp_link_send_test_response(panel->link);
Kuogee Hsieh July 29, 2021, 4:17 p.m. UTC | #2 
On 2021-07-22 12:23, Stephen Boyd wrote:
> Quoting Kuogee Hsieh (2021-07-13 08:54:05)
>> diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c 
>> b/drivers/gpu/drm/msm/dp/dp_panel.c
>> index 88196f7..0fdb551 100644
>> --- a/drivers/gpu/drm/msm/dp/dp_panel.c
>> +++ b/drivers/gpu/drm/msm/dp/dp_panel.c
>> @@ -303,7 +303,12 @@ void dp_panel_handle_sink_request(struct dp_panel 
>> *dp_panel)
>>         panel = container_of(dp_panel, struct dp_panel_private, 
>> dp_panel);
>> 
>>         if (panel->link->sink_request & DP_TEST_LINK_EDID_READ) {
>> -               u8 checksum = 
>> dp_panel_get_edid_checksum(dp_panel->edid);
>> +               u8 checksum;
>> +
>> +               if (dp_panel->edid)
>> +                       checksum = 
>> dp_panel_get_edid_checksum(dp_panel->edid);
>> +               else
>> +                       checksum = 
>> dp_panel->connector->real_edid_checksum;
> 
> Is there any reason why we can't use connector->real_edid_checksum all
> the time?
> 
real_edid_checksum only calculated by drm when edid checksum 
vitrification failed after edid read.
In the good edid checksum case (edid verification succeed), 
real_edid_checksum is not calculated by drm.
>> 
>>                 dp_link_send_edid_checksum(panel->link, checksum);
>>                 dp_link_send_test_response(panel->link);
diff mbox series

Patch

diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
index 88196f7..0fdb551 100644
--- a/drivers/gpu/drm/msm/dp/dp_panel.c
+++ b/drivers/gpu/drm/msm/dp/dp_panel.c
@@ -271,7 +271,7 @@  static u8 dp_panel_get_edid_checksum(struct edid *edid)
 {
 	struct edid *last_block;
 	u8 *raw_edid;
-	bool is_edid_corrupt;
+	bool is_edid_corrupt = false;
 
 	if (!edid) {
 		DRM_ERROR("invalid edid input\n");
@@ -303,7 +303,12 @@  void dp_panel_handle_sink_request(struct dp_panel *dp_panel)
 	panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
 
 	if (panel->link->sink_request & DP_TEST_LINK_EDID_READ) {
-		u8 checksum = dp_panel_get_edid_checksum(dp_panel->edid);
+		u8 checksum;
+
+		if (dp_panel->edid)
+			checksum = dp_panel_get_edid_checksum(dp_panel->edid);
+		else
+			checksum = dp_panel->connector->real_edid_checksum;
 
 		dp_link_send_edid_checksum(panel->link, checksum);
 		dp_link_send_test_response(panel->link);