From 8adbbb2e7871e76d53ea91e6159864ee534fdac8 Mon Sep 17 00:00:00 2001 From: Yannick Fertre Date: Fri, 29 Jun 2018 13:22:35 +0200 Subject: 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 Reviewed-by: Philippe Cornu Tested-by: Philippe Cornu Signed-off-by: Benjamin Gaignard Link: https://patchwork.freedesktop.org/patch/msgid/1530271355-5608-1-git-send-email-yannick.fertre@st.com --- drivers/gpu/drm/stm/ltdc.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'drivers/gpu/drm/stm/ltdc.c') 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, -- cgit v1.2.3