From: jiazhenyuan jiazhenyuan@uniontech.com

mainline inclusion from mainline-v5.1.0-rc2 commit b3198c38f02d54a5e964258a2180d502abe6eaf0 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I5D0PL CVE: NA

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The 50 ms default timeout waiting for vblanks is too small for the first vblank from the ST-Ericsson MCDE display controller over DSI. Presumably this is because the DSI display is command-mode only and the state machine will take some time setting up its state for the first display update, and we hit a timeout. 100 ms makes it pass without problems.

Signed-off-by: Linus Walleij linus.walleij@linaro.org Reviewed-by: Ville Syrjälä ville.syrjala@linux.intel.com Reviewed-by: Daniel Vetter daniel.vetter@ffwll.ch Link: https://patchwork.freedesktop.org/patch/msgid/20190430093746.26485-1-linus.w... Signed-off-by: jiazhenyuan jiazhenyuan@uniontech.com --- drivers/gpu/drm/drm_atomic_helper.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index c22062cc9992..f9306c3e9bab 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -1380,7 +1380,7 @@ drm_atomic_helper_wait_for_vblanks(struct drm_device *dev, ret = wait_event_timeout(dev->vblank[i].queue, old_state->crtcs[i].last_vblank_count != drm_crtc_vblank_count(crtc), - msecs_to_jiffies(50)); + msecs_to_jiffies(100));

WARN(!ret, "[CRTC:%d:%s] vblank wait timed out\n", crtc->base.id, crtc->name);