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Subject[PATCH] drm/stm: ltdc: update planes at next vblank to avoid partial refresh
Date
Plane updates must be synchronized on vblank with the shadow register mechanism
to avoid partial refresh on screen.

Signed-off-by: Yannick Fertré <yannick.fertre@st.com>
---
drivers/gpu/drm/stm/ltdc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index b1741a9..c2d0800 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -426,8 +426,8 @@ static void ltdc_crtc_atomic_enable(struct drm_crtc *crtc,
/* Enable IRQ */
reg_set(ldev->regs, LTDC_IER, IER_RRIE | IER_FUIE | IER_TERRIE);

- /* Immediately commit the planes */
- reg_set(ldev->regs, LTDC_SRCR, SRCR_IMR);
+ /* Commit shadow registers = update planes at next vblank */
+ reg_set(ldev->regs, LTDC_SRCR, SRCR_VBR);

/* Enable LTDC */
reg_set(ldev->regs, LTDC_GCR, GCR_LTDCEN);
--
2.7.4
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