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drm/stm: ltdc: update planes at next vblank to avoid partial refresh

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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>
Acked-by: Philippe Cornu <philippe.cornu@st.com>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1554103457-29595-1-git-send-email-yannick.fertre@st.com
This commit is contained in:
Yannick Fertré 2019-04-01 09:24:17 +02:00 committed by Benjamin Gaignard
parent c64d1cb6b1
commit 8ceb8568d6
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/stm/ltdc.c
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@ -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);