drm/stm: ltdc: reset controller to avoid partial refresh
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
diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index 17438c2..21a821e 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -1137,6 +1137,12 @@
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 @@
}
}
- if (!IS_ERR(rstc)) {
- reset_control_assert(rstc);
- usleep_range(10, 20);
- reset_control_deassert(rstc);
- }
ret = ltdc_get_caps(ddev);
if (ret) {
