[PATCH] drm/stm: ltdc: check crtc state before enabling LIE
From: Yannick Fertre <hidden>
Date: 2020-01-21 10:14:22
Also in:
dri-devel, lkml
Subsystem:
drm drivers, drm drivers and misc gpu patches, the rest · Maintainers:
David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Linus Torvalds
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 <redacted> --- drivers/gpu/drm/stm/ltdc.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index c2815e8..ea654c7 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c@@ -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; }
--
2.7.4
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