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authorYannick Fertre <yannick.fertre@st.com>2018-06-29 14:22:35 +0300
committerBenjamin Gaignard <benjamin.gaignard@linaro.org>2018-07-06 11:15:47 +0300
commit8adbbb2e7871e76d53ea91e6159864ee534fdac8 (patch)
tree77c696d7e6b67dccd891e5f56e6dc998118995e0 /drivers/gpu/drm/stm
parent7868e5079228b4c07cf61b5ad5d35af5c29f7375 (diff)
downloadlinux-8adbbb2e7871e76d53ea91e6159864ee534fdac8.tar.xz
drm/stm: ltdc: rework reset sequence
Reset must be properly assert before deassert. This is important if there is an early boot splash screen before the kernel start up. Signed-off-by: Yannick Fertre <yannick.fertre@st.com> Reviewed-by: Philippe Cornu <philippe.cornu@st.com> Tested-by: Philippe Cornu <philippe.cornu@st.com> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/1530271355-5608-1-git-send-email-yannick.fertre@st.com
Diffstat (limited to 'drivers/gpu/drm/stm')
-rw-r--r--drivers/gpu/drm/stm/ltdc.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index f1f37336a57a..808d9fb627e9 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -1082,8 +1082,11 @@ int ltdc_load(struct drm_device *ddev)
}
}
- if (!IS_ERR(rstc))
+ if (!IS_ERR(rstc)) {
+ reset_control_assert(rstc);
+ usleep_range(10, 20);
reset_control_deassert(rstc);
+ }
/* Disable interrupts */
reg_clear(ldev->regs, LTDC_IER,