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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
This commit is contained in:
Yannick Fertre 2018-06-29 13:22:35 +02:00 committed by Benjamin Gaignard
parent 7868e50792
commit 8adbbb2e78
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/stm/ltdc.c
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@ -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,