From 3b765c0b765d2cc03ef02276f1af2658a03b3ced Mon Sep 17 00:00:00 2001 From: Dhinakaran Pandiyan Date: Fri, 2 Feb 2018 21:12:53 -0800 Subject: drm/vblank: Data type fixes for 64-bit vblank sequences. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit drm_vblank_count() has an u32 type returning what is a 64-bit vblank count. The effect of this is when drm_wait_vblank_ioctl() tries to widen the user space requested vblank sequence using this clipped 32-bit count(when the value is >= 2^32) as reference, the requested sequence remains a 32-bit value and gets queued like that. However, the code that checks if the requested sequence has passed compares this against the 64-bit vblank count. With drm_vblank_count() returning all bits of the vblank count, update drm_crtc_accurate_vblank_count() so that drm_crtc_arm_vblank_event() queues the correct sequence. Otherwise, this leads to prolonged waits for a vblank sequence when the current count is >=2^32. Finally, fix drm_wait_one_vblank() too. v2: Commit message fix (Keith) Squash commits (Rodrigo) Fixes: 570e86963a51 ("drm: Widen vblank count to 64-bits [v3]") Cc: Keith Packard Cc: Michel Dänzer Cc: Daniel Vetter Cc: Rodrigo Vivi Signed-off-by: Dhinakaran Pandiyan Acked-by: Daniel Vetter Reviewed-by: Keith Packard Signed-off-by: Rodrigo Vivi Link: https://patchwork.freedesktop.org/patch/msgid/20180203051302.9974-1-dhinakaran.pandiyan@intel.com --- include/drm/drm_vblank.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include/drm/drm_vblank.h') diff --git a/include/drm/drm_vblank.h b/include/drm/drm_vblank.h index 848b463a0af5..a4c3b0a0a197 100644 --- a/include/drm/drm_vblank.h +++ b/include/drm/drm_vblank.h @@ -179,7 +179,7 @@ void drm_crtc_wait_one_vblank(struct drm_crtc *crtc); void drm_crtc_vblank_off(struct drm_crtc *crtc); void drm_crtc_vblank_reset(struct drm_crtc *crtc); void drm_crtc_vblank_on(struct drm_crtc *crtc); -u32 drm_crtc_accurate_vblank_count(struct drm_crtc *crtc); +u64 drm_crtc_accurate_vblank_count(struct drm_crtc *crtc); bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, unsigned int pipe, int *max_error, -- cgit