[PATCH v2 6/6] drm/fsl-dcu: disable vblank events on CRTC disable

From: Stefan Agner
Date: Fri Jun 03 2016 - 18:57:35 EST


Disable vblank events when CRTC gets disabled. This avoids an
external abort when entering suspend while disable_timer is still
active: On resume the timer might fire immediately and cause a
register access in fsl_dcu_drm_disable_vblank before clocks get
enabled by the resume function.

Signed-off-by: Stefan Agner <stefan@xxxxxxxx>
---
drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
index ca0f7d83..36df2eb 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
@@ -43,6 +43,8 @@ static void fsl_dcu_drm_disable_crtc(struct drm_crtc *crtc)
struct drm_device *dev = crtc->dev;
struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;

+ drm_crtc_vblank_off(crtc);
+
regmap_update_bits(fsl_dev->regmap, DCU_DCU_MODE,
DCU_MODE_DCU_MODE_MASK,
DCU_MODE_DCU_MODE(DCU_MODE_OFF));
@@ -60,6 +62,8 @@ static void fsl_dcu_drm_crtc_enable(struct drm_crtc *crtc)
DCU_MODE_DCU_MODE(DCU_MODE_NORMAL));
regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
DCU_UPDATE_MODE_READREG);
+
+ drm_crtc_vblank_on(crtc);
}

static void fsl_dcu_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
--
2.8.2