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drm/msm/dp: return correct edid checksum after corrupted edid checksum read

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[ Upstream commit 7948fe12d47a946fb8025a0534c900e3dd4b5839 ]

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>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/1628196295-7382-6-git-send-email-khsieh@codeaurora.org
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kuogee Hsieh 2021-08-05 13:44:54 -07:00 committed by Greg Kroah-Hartman
parent 98d44b7be6
commit f86bc4a1a4
1 changed files with 7 additions and 2 deletions
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9
drivers/gpu/drm/msm/dp/dp_panel.c
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@ -261,7 +261,7 @@ 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");
@ -293,7 +293,12 @@ 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);