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drm/stm: ltdc: reset controller to avoid partial refresh

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Display controller reset must be done as soon as possible after enable
the clock 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/1554283453-2879-1-git-send-email-yannick.fertre@st.com
This commit is contained in:
Yannick Fertré 2019-04-03 11:24:13 +02:00 committed by Benjamin Gaignard
parent 77756ad6d0
commit f42f540b9d
1 changed files with 6 additions and 5 deletions
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11
drivers/gpu/drm/stm/ltdc.c
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@ -1137,6 +1137,12 @@ int ltdc_load(struct drm_device *ddev)
return -ENODEV;
}
if (!IS_ERR(rstc)) {
reset_control_assert(rstc);
usleep_range(10, 20);
reset_control_deassert(rstc);
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
ldev->regs = devm_ioremap_resource(dev, res);
if (IS_ERR(ldev->regs)) {
@ -1163,11 +1169,6 @@ int ltdc_load(struct drm_device *ddev)
}
}
if (!IS_ERR(rstc)) {
reset_control_assert(rstc);
usleep_range(10, 20);
reset_control_deassert(rstc);
}
ret = ltdc_get_caps(ddev);
if (ret) {