Messages in this thread Patch in this message | | | From | Yannick Fertré <> | Subject | [PATCH] drm/stm: ltdc: update planes at next vblank to avoid partial refresh | Date | Mon, 1 Apr 2019 09:24:17 +0200 |
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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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