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disp: msm: sde: cancel delayed work items during TUI transition

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Delayed work items may touch HW registers. If these work items
run while HW is not owned by this VM it will lead to invalid
access. This happens in video mode as HAL does not disable idle
power-collapse in this mode. It can also happen with ESD status
if lastclose or TUI transition failure occurs.

Although there is a contract with user mode to turn off certain
features, kernel cannot rely on it to always do the right thing.
Prevent potential crashes from certain corner cases by
cancelling all delayed work items when the HW ownership is
transferred.

Change-Id: I08da17f2ce72bf2fddf71924c3e8edd2e2715be8
Signed-off-by: Steve Cohen <cohens@codeaurora.org>
This commit is contained in:
Steve Cohen
2021-07-09 19:31:03 -04:00
parent a5da9d0045
commit a42fd877c7
5 changed files with 113 additions and 63 deletions
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6
msm/sde/sde_encoder.h
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@@ -613,6 +613,12 @@ void sde_encoder_virt_reset(struct drm_encoder *drm_enc);
*/
ktime_t sde_encoder_calc_last_vsync_timestamp(struct drm_encoder *drm_enc);
/**
* sde_encoder_cancel_delayed_work - cancel delayed off work for encoder
* @drm_enc: Pointer to drm encoder structure
*/
void sde_encoder_cancel_delayed_work(struct drm_encoder *encoder);
/**
* sde_encoder_get_kms - retrieve the kms from encoder
* @drm_enc: Pointer to drm encoder structure