drm/msm/dsi: skip the wait for video mode done if not applicable
dsi_wait4video_done() API waits for the DSI video mode engine to become idle so that we can transmit the DCS commands in the beginning of BLLP. However, with the current sequence, the MDP timing engine is turned on after the panel's pre_enable() callback which can send out the DCS commands needed to power up the panel. During those cases, this API will always timeout and print out the error spam leading to long bootup times and log flooding. Fix this by checking if the DSI video engine was actually busy before waiting for it to become idle otherwise this is a redundant wait. changes in v2: - move the reg read below the video mode check - minor fixes in commit text Closes: https://gitlab.freedesktop.org/drm/msm/-/issues/34 Fixes: a689554b ("drm/msm: Initial add DSI connector support") Signed-off-by:Abhinav Kumar <quic_abhinavk@quicinc.com> Reviewed-by:
Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Patchwork: https://patchwork.freedesktop.org/patch/557853/ Link: https://lore.kernel.org/r/20230915204426.19011-1-quic_abhinavk@quicinc.com
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