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drm/msm/dp: skip validity check for DP CTS EDID checksum

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[ Upstream commit a251c9d8e30833b260101edb9383b176ee2b7cb1 ]

The DP CTS test for EDID last block checksum expects the checksum for
the last block, invalid or not. Skip the validity check.

For the most part (*), the EDIDs returned by drm_get_edid() will be
valid anyway, and there's the CTS workaround to get the checksum for
completely invalid EDIDs. See commit 7948fe12d4 ("drm/msm/dp: return
correct edid checksum after corrupted edid checksum read").

This lets us remove one user of drm_edid_block_valid() with hopes the
function can be removed altogether in the future.

(*) drm_get_edid() ignores checksum errors on CTA extensions.

Cc: Abhinav Kumar <quic_abhinavk@quicinc.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc: Kuogee Hsieh <khsieh@codeaurora.org>
Cc: Marijn Suijten <marijn.suijten@somainline.org>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Sean Paul <sean@poorly.run>
Cc: Stephen Boyd <swboyd@chromium.org>
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Reviewed-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/555361/
Link: https://lore.kernel.org/r/20230901142034.580802-1-jani.nikula@intel.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jani Nikula 2023-09-01 17:20:34 +03:00 • committed by Greg Kroah-Hartman
parent 412ce89669
commit 09b900fc2c
1 changed files with 2 additions and 19 deletions
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21
drivers/gpu/drm/msm/dp/dp_panel.c
View file

@ -266,26 +266,9 @@ int dp_panel_get_modes(struct dp_panel *dp_panel,
static u8 dp_panel_get_edid_checksum(struct edid *edid) static u8 dp_panel_get_edid_checksum(struct edid *edid)
{ {
struct edid *last_block; edid += edid->extensions;
u8 *raw_edid;
bool is_edid_corrupt = false;
if (!edid) { return edid->checksum;
DRM_ERROR("invalid edid input\n");
return 0;
}
raw_edid = (u8 *)edid;
raw_edid += (edid->extensions * EDID_LENGTH);
last_block = (struct edid *)raw_edid;
/* block type extension */
drm_edid_block_valid(raw_edid, 1, false, &is_edid_corrupt);
if (!is_edid_corrupt)
return last_block->checksum;
DRM_ERROR("Invalid block, no checksum\n");
return 0;
} }
void dp_panel_handle_sink_request(struct dp_panel *dp_panel) void dp_panel_handle_sink_request(struct dp_panel *dp_panel)