[PATCH 1/2] drm/fsl-dcu: implement irq_preinstall/uninstall callbacks

[Stefan Agner]

Make use of the irq_preinstall/uninstall callback to clear and
mask all interrupts. Use write 1 to clear as documented by the
data sheet (writing a 0 seems to have cleared interrupt status
too). Remove fsl_dcu_drm_irq_init and call drm_irq_install
directly from fsl_dcu_load makes error handling a bit simpler.
Do not set irq_enabled since drm_irq_install is taking care of
it.

Signed-off-by: Stefan Agner <ste...@agner.ch>
---
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

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 6e00f4b..d86f35c 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
@@ -51,19 +51,12 @@ static const struct regmap_config fsl_dcu_regmap_config = {
        .volatile_reg = fsl_dcu_drm_is_volatile_reg,
 };
 
-static int fsl_dcu_drm_irq_init(struct drm_device *dev)
+static void fsl_dcu_irq_uninstall(struct drm_device *dev)
 {
        struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
-       int ret;
-
-       ret = drm_irq_install(dev, fsl_dev->irq);
-       if (ret < 0)
-               dev_err(dev->dev, "failed to install IRQ handler\n");
 
-       regmap_write(fsl_dev->regmap, DCU_INT_STATUS, 0);
+       regmap_write(fsl_dev->regmap, DCU_INT_STATUS, ~0);
        regmap_write(fsl_dev->regmap, DCU_INT_MASK, ~0);
-
-       return ret;
 }
 
 static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
@@ -83,10 +76,11 @@ static int fsl_dcu_load(struct drm_device *dev, unsigned 
long flags)
                goto done;
        }
 
-       ret = fsl_dcu_drm_irq_init(dev);
-       if (ret < 0)
+       ret = drm_irq_install(dev, fsl_dev->irq);
+       if (ret < 0) {
+               dev_err(dev->dev, "failed to install IRQ handler\n");
                goto done;
-       dev->irq_enabled = true;
+       }
 
        if (legacyfb_depth != 16 && legacyfb_depth != 24 &&
            legacyfb_depth != 32) {
@@ -170,6 +164,8 @@ static struct drm_driver fsl_dcu_drm_driver = {
        .load                   = fsl_dcu_load,
        .unload                 = fsl_dcu_unload,
        .irq_handler            = fsl_dcu_drm_irq,
+       .irq_preinstall         = fsl_dcu_irq_uninstall,
+       .irq_uninstall          = fsl_dcu_irq_uninstall,
        .gem_free_object_unlocked = drm_gem_cma_free_object,
        .gem_vm_ops             = &drm_gem_cma_vm_ops,
        .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,

base-commit: 2a1720376adda5ecf8e636fbfb05339c7dad1c55
-- 
git-series 0.9.1