drm: rcar-du: Turn vblank on/off when enabling/disabling CRTC

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The DRM core vblank handling mechanism requires drivers to forcefully
turn vblank reporting off when disabling the CRTC, and to restore the
vblank reporting status when enabling the CRTC.

Implement this using the drm_crtc_vblank_on/off helpers. When disabling
vblank we must first wait for page flips to complete, so implement page
flip completion wait as well.

Finally, drm_crtc_vblank_off() must be called at startup to synchronize
the state of the vblank core code with the hardware, which is initially
disabled. This is performed at CRTC creation time, requiring vertical
blanking to be initialized before creating CRTCs.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

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This commit is contained in:

Laurent Pinchart 2015-02-18 13:14:46 +02:00

parent 36693f3c32

commit 0cd90a5428

2 changed files with 21 additions and 11 deletions

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18

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

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16

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

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