drm: rcar-du: Fix race condition when disabling planes at CRTC stop

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When stopping the CRTC the driver must disable all planes and wait for
the change to take effect at the next vblank. Merely calling
drm_crtc_wait_one_vblank() is not enough, as the function doesn't
include any mechanism to handle the race with vblank interrupts.

Replace the drm_crtc_wait_one_vblank() call with a manual mechanism that
handles the vblank interrupt race.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

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This commit is contained in:

Laurent Pinchart 2017-07-29 02:31:33 +03:00

parent d6160246f6

commit 641307df71

2 changed files with 60 additions and 6 deletions

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58

drivers/gpu/drm/rcar-du/rcar_du_crtc.c

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8

drivers/gpu/drm/rcar-du/rcar_du_crtc.h

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