diff mbox

[1/8] drm/rockchip: Clear interrupt status bits before enabling

Message ID 1473857701-9250-2-git-send-email-tfiga@chromium.org (mailing list archive)
State New, archived
Headers show

Commit Message

Tomasz Figa Sept. 14, 2016, 12:54 p.m. UTC 
The enable register only masks the raw status bits to signal CPU
interrupt only for enabled interrupts. The status bits are activated
regardless of the enable register. This means that we might have an old
interrupt event queued, which we are not interested in. To avoid getting
a spurious interrupt signalled, we have to clear the old bit before we
update the enable register.

Signed-off-by: Tomasz Figa <tfiga@chromium.org>
---
 drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox

Patch

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index 209167b..7e811cf 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -414,6 +414,7 @@  static void vop_dsp_hold_valid_irq_enable(struct vop *vop)
 
 	spin_lock_irqsave(&vop->irq_lock, flags);
 
+	VOP_INTR_SET_TYPE(vop, clear, DSP_HOLD_VALID_INTR, 1);
 	VOP_INTR_SET_TYPE(vop, enable, DSP_HOLD_VALID_INTR, 1);
 
 	spin_unlock_irqrestore(&vop->irq_lock, flags);
@@ -479,6 +480,7 @@  static void vop_line_flag_irq_enable(struct vop *vop, int line_num)
 	spin_lock_irqsave(&vop->irq_lock, flags);
 
 	VOP_CTRL_SET(vop, line_flag_num[0], line_num);
+	VOP_INTR_SET_TYPE(vop, clear, LINE_FLAG_INTR, 1);
 	VOP_INTR_SET_TYPE(vop, enable, LINE_FLAG_INTR, 1);
 
 	spin_unlock_irqrestore(&vop->irq_lock, flags);
@@ -921,6 +923,7 @@  static int vop_crtc_enable_vblank(struct drm_crtc *crtc)
 
 	spin_lock_irqsave(&vop->irq_lock, flags);
 
+	VOP_INTR_SET_TYPE(vop, clear, FS_INTR, 1);
 	VOP_INTR_SET_TYPE(vop, enable, FS_INTR, 1);
 
 	spin_unlock_irqrestore(&vop->irq_lock, flags);