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| author |   Rajkumar Subbiah <rsubbia@codeaurora.org> | 2021-07-06 08:30:34 -0700 |
|---|---|---|
| committer |   Lyude Paul <lyude@redhat.com> | 2021-07-27 18:58:28 -0400 |
| commit | 92bd92c44d0d9be5dcbcda315b4be4b909ed9740 (patch) | |
| tree | fbc08c8b0dab0ad6c6935b9fd4da369286f1d836 /drivers/gpu/drm/vmwgfx | |
| parent | drm: mxsfb: Clear FIFO_CLEAR bit (diff) | |
| download | linux-dev-92bd92c44d0d9be5dcbcda315b4be4b909ed9740.tar.xz linux-dev-92bd92c44d0d9be5dcbcda315b4be4b909ed9740.zip | |
drm/dp_mst: Fix return code on sideband message failure
Commit 2f015ec6eab6 ("drm/dp_mst: Add sideband down request tracing +
selftests") added some debug code for sideband message tracing. But
it seems to have unintentionally changed the behavior on sideband message
failure. It catches and returns failure only if DRM_UT_DP is enabled.
Otherwise it ignores the error code and returns success. So on an MST
unplug, the caller is unaware that the clear payload message failed and
ends up waiting for 4 seconds for the response. Fixes the issue by
returning the proper error code.
Changes in V2:
-- Revise commit text as review comment
-- add Fixes text
Changes in V3:
-- remove "unlikely" optimization
Fixes: 2f015ec6eab6 ("drm/dp_mst: Add sideband down request tracing + selftests")
Cc: <stable@vger.kernel.org> # v5.5+
Signed-off-by: Rajkumar Subbiah <rsubbia@codeaurora.org>
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1625585434-9562-1-git-send-email-khsieh@codeaurora.org
Diffstat (limited to 'drivers/gpu/drm/vmwgfx')
0 files changed, 0 insertions, 0 deletions