[PATCH v3] drm/shmobile: Convert to Linux IRQ interfaces

[Thomas Zimmermann <tzimmermann@suse.de>]

Drop the DRM IRQ midlayer in favor of Linux IRQ interfaces. DRM's
IRQ helpers are mostly useful for UMS drivers. Modern KMS drivers
don't benefit from using it.

v3:
	* return error if (ret < 0) (Geert)
	* remove duplicate error message (Geert)
v2:
	* handle errors in platform_get_irq() (Geert, Sergei)
	* store IRQ number in struct shmob_drm_device (Laurent)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
---
 drivers/gpu/drm/shmobile/shmob_drm_drv.c | 14 +++++++++-----
 drivers/gpu/drm/shmobile/shmob_drm_drv.h |  1 +
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/shmobile/shmob_drm_drv.c b/drivers/gpu/drm/shmobile/shmob_drm_drv.c
index 0a02b7092c04..7db01904d18d 100644
--- a/drivers/gpu/drm/shmobile/shmob_drm_drv.c
+++ b/drivers/gpu/drm/shmobile/shmob_drm_drv.c
@@ -18,7 +18,6 @@
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_gem_cma_helper.h>
-#include <drm/drm_irq.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_vblank.h>
 
@@ -130,7 +129,6 @@ DEFINE_DRM_GEM_CMA_FOPS(shmob_drm_fops);
 
 static const struct drm_driver shmob_drm_driver = {
 	.driver_features	= DRIVER_GEM | DRIVER_MODESET,
-	.irq_handler		= shmob_drm_irq,
 	DRM_GEM_CMA_DRIVER_OPS,
 	.fops			= &shmob_drm_fops,
 	.name			= "shmob-drm",
@@ -183,7 +181,7 @@ static int shmob_drm_remove(struct platform_device *pdev)
 
 	drm_dev_unregister(ddev);
 	drm_kms_helper_poll_fini(ddev);
-	drm_irq_uninstall(ddev);
+	free_irq(sdev->irq, ddev);
 	drm_dev_put(ddev);
 
 	return 0;
@@ -258,7 +256,13 @@ static int shmob_drm_probe(struct platform_device *pdev)
 		goto err_modeset_cleanup;
 	}
 
-	ret = drm_irq_install(ddev, platform_get_irq(pdev, 0));
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0)
+		goto err_modeset_cleanup;
+	sdev->irq = ret;
+
+	ret = request_irq(sdev->irq, shmob_drm_irq, 0, ddev->driver->name,
+			  ddev);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to install IRQ handler\n");
 		goto err_modeset_cleanup;
@@ -275,7 +279,7 @@ static int shmob_drm_probe(struct platform_device *pdev)
 	return 0;
 
 err_irq_uninstall:
-	drm_irq_uninstall(ddev);
+	free_irq(sdev->irq, ddev);
 err_modeset_cleanup:
 	drm_kms_helper_poll_fini(ddev);
 err_free_drm_dev:
diff --git a/drivers/gpu/drm/shmobile/shmob_drm_drv.h b/drivers/gpu/drm/shmobile/shmob_drm_drv.h
index 80dc4b1020aa..4964ddd5ab74 100644
--- a/drivers/gpu/drm/shmobile/shmob_drm_drv.h
+++ b/drivers/gpu/drm/shmobile/shmob_drm_drv.h
@@ -29,6 +29,7 @@ struct shmob_drm_device {
 	u32 lddckr;
 	u32 ldmt1r;
 
+	unsigned int irq;
 	spinlock_t irq_lock;		/* Protects hardware LDINTR register */
 
 	struct drm_device *ddev;
-- 
2.32.0