drm/rcar-du: Support per-CRTC clock and IRQ

Some of the DU revisions use one clock and IRQ per CRTC instead of one
clock and IRQ per device. Retrieve the correct clock and register the
correct IRQ for each CRTC.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

1 files changed, 8 insertions, 44 deletions

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
index bb7193d79dfe..5f82e046f83e 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
@@ -35,8 +35,8 @@
 /*
  * rcar_du_get - Acquire a reference to the DU
  *
- * Acquiring a reference enables the device clock and setup core registers. A
- * reference must be held before accessing any hardware registers.
+ * Acquiring the first  reference setups core registers. A reference must be
+ * held before accessing any hardware registers.
  *
  * This function must be called with the DRM mode_config lock held.
  *
@@ -44,16 +44,9 @@
  */
 int rcar_du_get(struct rcar_du_device *rcdu)
 {
-	int ret;
-
 	if (rcdu->use_count)
 		goto done;
 
-	/* Enable clocks before accessing the hardware. */
-	ret = clk_prepare_enable(rcdu->clock);
-	if (ret < 0)
-		return ret;
-
 	/* Enable extended features */
 	rcar_du_write(rcdu, DEFR, DEFR_CODE | DEFR_DEFE);
 	rcar_du_write(rcdu, DEFR2, DEFR2_CODE | DEFR2_DEFE2G);
@@ -74,16 +67,11 @@ done:
 /*
  * rcar_du_put - Release a reference to the DU
  *
- * Releasing the last reference disables the device clock.
- *
  * This function must be called with the DRM mode_config lock held.
  */
 void rcar_du_put(struct rcar_du_device *rcdu)
 {
-	if (--rcdu->use_count)
-		return;
-
-	clk_disable_unprepare(rcdu->clock);
+	--rcdu->use_count;
 }
 
 /* -----------------------------------------------------------------------------
@@ -95,8 +83,8 @@ static int rcar_du_unload(struct drm_device *dev)
 	drm_kms_helper_poll_fini(dev);
 	drm_mode_config_cleanup(dev);
 	drm_vblank_cleanup(dev);
-	drm_irq_uninstall(dev);
 
+	dev->irq_enabled = 0;
 	dev->dev_private = NULL;
 
 	return 0;
@@ -127,18 +115,12 @@ static int rcar_du_load(struct drm_device *dev, unsigned long flags)
 	rcdu->ddev = dev;
 	dev->dev_private = rcdu;
 
-	/* I/O resources and clocks */
+	/* I/O resources */
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	rcdu->mmio = devm_ioremap_resource(&pdev->dev, mem);
 	if (IS_ERR(rcdu->mmio))
 		return PTR_ERR(rcdu->mmio);
 
-	rcdu->clock = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(rcdu->clock)) {
-		dev_err(&pdev->dev, "failed to get clock\n");
-		return -ENOENT;
-	}
-
 	/* DRM/KMS objects */
 	ret = rcar_du_modeset_init(rcdu);
 	if (ret < 0) {
@@ -146,18 +128,14 @@ static int rcar_du_load(struct drm_device *dev, unsigned long flags)
 		goto done;
 	}
 
-	/* IRQ and vblank handling */
+	/* vblank handling */
 	ret = drm_vblank_init(dev, (1 << rcdu->num_crtcs) - 1);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to initialize vblank\n");
 		goto done;
 	}
 
-	ret = drm_irq_install(dev);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to install IRQ handler\n");
-		goto done;
-	}
+	dev->irq_enabled = 1;
 
 	platform_set_drvdata(pdev, rcdu);
 
@@ -177,18 +155,6 @@ static void rcar_du_preclose(struct drm_device *dev, struct drm_file *file)
 		rcar_du_crtc_cancel_page_flip(&rcdu->crtcs[i], file);
 }
 
-static irqreturn_t rcar_du_irq(int irq, void *arg)
-{
-	struct drm_device *dev = arg;
-	struct rcar_du_device *rcdu = dev->dev_private;
-	unsigned int i;
-
-	for (i = 0; i < ARRAY_SIZE(rcdu->crtcs); ++i)
-		rcar_du_crtc_irq(&rcdu->crtcs[i]);
-
-	return IRQ_HANDLED;
-}
-
 static int rcar_du_enable_vblank(struct drm_device *dev, int crtc)
 {
 	struct rcar_du_device *rcdu = dev->dev_private;
@@ -221,12 +187,10 @@ static const struct file_operations rcar_du_fops = {
 };
 
 static struct drm_driver rcar_du_driver = {
-	.driver_features	= DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET
-				| DRIVER_PRIME,
+	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME,
 	.load			= rcar_du_load,
 	.unload			= rcar_du_unload,
 	.preclose		= rcar_du_preclose,
-	.irq_handler		= rcar_du_irq,
 	.get_vblank_counter	= drm_vblank_count,
 	.enable_vblank		= rcar_du_enable_vblank,
 	.disable_vblank		= rcar_du_disable_vblank,