[1/4] drm/fsl-dcu: Cleanup vblank interrupt mask and status setting code

Commit Message

Meng Yi Jan. 26, 2016, 4 a.m. UTC

From: Jianwei Wang <[e-mail]>

Switch update interrupt mask bit with regmap_update_bits, and clear
interrupt status by writing 1 to relevant bit before setting mask in
fsl_dcu_drm_irq_init function.

Signed-off-by: JianWei Wang <[e-mail]>
Signed-off-by: Meng Yi <[e-mail]>
---
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c | 26 +++++++-------------------
 1 file changed, 7 insertions(+), 19 deletions(-)

Comments

Meng Yi Jan. 29, 2016, 2:42 a.m. UTC | #1

Hi, Stefan
I had tested your patch(https://lkml.org/lkml/2015/11/18/951) in ls1021-twr board, I think you can merge this patch to your tree if Jianwei don't have any objections.

> On  Tuesday, January 26, 2016 1:45 PM, Stefan Agner <[e-mail]> wrote:
> 
> As I wrote earlier
> (http://www.spinics.net/lists/dri-devel/msg95703.html), my fixes patchset
> contains a similar patch which also explicitly disable the VBLANK interrupt. I
> think it is the better solution... See:
> https://lkml.org/lkml/2015/11/18/951
> 
> I will soon prepare a git tree and plan to submit that for 4.6, currently I plan to
> include
> - Your "Fix no fb check bug" patch
> - My "fixes and enhancements" patchset
> - My "fix register initialization" and "use flat regmap cache" patch
> 
> Let me know if you have any objections.
> 
> --
> Stefan

Patch

diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
index fca97d3..cbef47c 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
@@ -38,21 +38,17 @@  static const struct regmap_config fsl_dcu_regmap_config = {
 static int fsl_dcu_drm_irq_init(struct drm_device *dev)
 {
 	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
-	unsigned int value;
 	int ret;
 
 	ret = drm_irq_install(dev, fsl_dev->irq);
 	if (ret < 0)
 		dev_err(dev->dev, "failed to install IRQ handler\n");
 
-	ret = regmap_write(fsl_dev->regmap, DCU_INT_STATUS, 0);
+	ret = regmap_write(fsl_dev->regmap, DCU_INT_STATUS, 0xffffffff);
 	if (ret)
 		dev_err(dev->dev, "set DCU_INT_STATUS failed\n");
-	ret = regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
-	if (ret)
-		dev_err(dev->dev, "read DCU_INT_MASK failed\n");
-	value &= DCU_INT_MASK_VBLANK;
-	ret = regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
+	ret = regmap_update_bits(fsl_dev->regmap, DCU_INT_MASK,
+				 DCU_INT_MASK_VBLANK, ~DCU_INT_MASK_VBLANK);
 	if (ret)
 		dev_err(dev->dev, "set DCU_INT_MASK failed\n");
 	ret = regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
@@ -143,14 +139,10 @@  static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg)
 static int fsl_dcu_drm_enable_vblank(struct drm_device *dev, unsigned int pipe)
 {
 	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
-	unsigned int value;
 	int ret;
 
-	ret = regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
-	if (ret)
-		dev_err(dev->dev, "read DCU_INT_MASK failed\n");
-	value &= ~DCU_INT_MASK_VBLANK;
-	ret = regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
+	ret = regmap_update_bits(fsl_dev->regmap, DCU_INT_MASK,
+				 DCU_INT_MASK_VBLANK, ~DCU_INT_MASK_VBLANK);
 	if (ret)
 		dev_err(dev->dev, "set DCU_INT_MASK failed\n");
 	return 0;
@@ -160,14 +152,10 @@  static void fsl_dcu_drm_disable_vblank(struct drm_device *dev,
 				       unsigned int pipe)
 {
 	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
-	unsigned int value;
 	int ret;
 
-	ret = regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
-	if (ret)
-		dev_err(dev->dev, "read DCU_INT_MASK failed\n");
-	value |= DCU_INT_MASK_VBLANK;
-	ret = regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
+	ret = regmap_update_bits(fsl_dev->regmap, DCU_INT_MASK,
+				 DCU_INT_MASK_VBLANK, DCU_INT_MASK_VBLANK);
 	if (ret)
 		dev_err(dev->dev, "set DCU_INT_MASK failed\n");
 }