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drm/stm: ltdc: check crtc state before enabling LIE 

Following investigations of a hardware bug, the LIE interrupt
can occur while the display controller is not activated.
LIE interrupt (vblank) don't have to be set if the CRTC is not
enabled.

Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
Acked-by: Philippe Cornu <philippe.cornu@st.com>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1579601650-7055-1-git-send-email-yannick.fertre@st.com
This commit is contained in:
Yannick Fertre 2020-01-21 11:14:10 +01:00 committed by Benjamin Gaignard
parent 544aa6cefb
commit a6bd58c51a
1 changed files with 6 additions and 1 deletions
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7
drivers/gpu/drm/stm/ltdc.c
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@ -648,9 +648,14 @@ static const struct drm_crtc_helper_funcs ltdc_crtc_helper_funcs = {
static int ltdc_crtc_enable_vblank(struct drm_crtc *crtc)
{
struct ltdc_device *ldev = crtc_to_ltdc(crtc);
struct drm_crtc_state *state = crtc->state;
DRM_DEBUG_DRIVER("\n");
reg_set(ldev->regs, LTDC_IER, IER_LIE);
if (state->enable)
reg_set(ldev->regs, LTDC_IER, IER_LIE);
else
return -EPERM;
return 0;
}