drm/msm/dp: reset aux controller after dp_aux_cmd_fifo_tx() failed.

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Aux hardware calibration sequence requires resetting the aux controller
in order for the new setting to take effect. However resetting the AUX
controller will also clear HPD interrupt status which may accidentally
cause pending unplug interrupt to get lost. Therefore reset aux
controller only when link is in connection state when dp_aux_cmd_fifo_tx()
fail. This fixes Link Layer CTS cases 4.2.1.1 and 4.2.1.2.

Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/1628196295-7382-4-git-send-email-khsieh@codeaurora.org
Signed-off-by: Rob Clark <robdclark@chromium.org>

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Kuogee Hsieh 2021-08-05 13:44:52 -07:00 • committed by Rob Clark

parent 4b85d405cf

commit 0b324564ff

1 changed files with 3 additions and 0 deletions

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drivers/gpu/drm/msm/dp/dp_aux.c

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