summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/armada
diff options
context:
space:
mode:
authorRussell King <rmk+kernel@armlinux.org.uk>2018-06-26 17:06:06 +0100
committerRussell King <rmk+kernel@armlinux.org.uk>2018-07-09 11:32:58 +0100
commit92298c1cd8e8a6b56322b602ad72b54e6237631d (patch)
treef2a54dc04157197b562cb62ba04b003e6d8d183b /drivers/gpu/drm/armada
parentd378859a667edc99e3473704847698cae97ca2b1 (diff)
drm/armada: fix irq handling
Add the missing locks to the IRQ enable/disable paths, and fix a comment in the interrupt handler: reading the ISR clears down the status bits, but does not reset the interrupt so it can signal again. That seems to require a write. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'drivers/gpu/drm/armada')
-rw-r--r--drivers/gpu/drm/armada/armada_crtc.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/gpu/drm/armada/armada_crtc.c b/drivers/gpu/drm/armada/armada_crtc.c
index 03eeee11dd5b..42a40daff132 100644
--- a/drivers/gpu/drm/armada/armada_crtc.c
+++ b/drivers/gpu/drm/armada/armada_crtc.c
@@ -519,8 +519,9 @@ static irqreturn_t armada_drm_irq(int irq, void *arg)
u32 v, stat = readl_relaxed(dcrtc->base + LCD_SPU_IRQ_ISR);
/*
- * This is rediculous - rather than writing bits to clear, we
- * have to set the actual status register value. This is racy.
+ * Reading the ISR appears to clear bits provided CLEAN_SPU_IRQ_ISR
+ * is set. Writing has some other effect to acknowledge the IRQ -
+ * without this, we only get a single IRQ.
*/
writel_relaxed(0, dcrtc->base + LCD_SPU_IRQ_ISR);
@@ -1116,16 +1117,22 @@ armada_drm_crtc_set_property(struct drm_crtc *crtc,
static int armada_drm_crtc_enable_vblank(struct drm_crtc *crtc)
{
struct armada_crtc *dcrtc = drm_to_armada_crtc(crtc);
+ unsigned long flags;
+ spin_lock_irqsave(&dcrtc->irq_lock, flags);
armada_drm_crtc_enable_irq(dcrtc, VSYNC_IRQ_ENA);
+ spin_unlock_irqrestore(&dcrtc->irq_lock, flags);
return 0;
}
static void armada_drm_crtc_disable_vblank(struct drm_crtc *crtc)
{
struct armada_crtc *dcrtc = drm_to_armada_crtc(crtc);
+ unsigned long flags;
+ spin_lock_irqsave(&dcrtc->irq_lock, flags);
armada_drm_crtc_disable_irq(dcrtc, VSYNC_IRQ_ENA);
+ spin_unlock_irqrestore(&dcrtc->irq_lock, flags);
}
static const struct drm_crtc_funcs armada_crtc_funcs = {
@@ -1415,6 +1422,7 @@ static int armada_drm_crtc_create(struct drm_device *drm, struct device *dev,
CFG_PDWN64x66, dcrtc->base + LCD_SPU_SRAM_PARA1);
writel_relaxed(0x2032ff81, dcrtc->base + LCD_SPU_DMA_CTRL1);
writel_relaxed(dcrtc->irq_ena, dcrtc->base + LCD_SPU_IRQ_ENA);
+ readl_relaxed(dcrtc->base + LCD_SPU_IRQ_ISR);
writel_relaxed(0, dcrtc->base + LCD_SPU_IRQ_ISR);
ret = devm_request_irq(dev, irq, armada_drm_irq, 0, "armada_drm_crtc",