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    Subject[PATCH AUTOSEL 5.10 103/176] drm/msm/dp: return correct edid checksum after corrupted edid checksum read
    Date
    From: Kuogee Hsieh <khsieh@codeaurora.org>

    [ 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>
    ---
    drivers/gpu/drm/msm/dp/dp_panel.c | 9 +++++++--
    1 file changed, 7 insertions(+), 2 deletions(-)

    diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
    index 18cec4fc5e0b..2768d1d306f0 100644
    --- a/drivers/gpu/drm/msm/dp/dp_panel.c
    +++ b/drivers/gpu/drm/msm/dp/dp_panel.c
    @@ -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);
    --
    2.30.2
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