drm/tidss: Convert to Linux IRQ interfaces

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.

DRM IRQ callbacks are now being called directly or inlined.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210803090704.32152-11-tzimmermann@suse.de

drivers/gpu/drm/tidss/tidss_drv.c

@@ -16,7 +16,6 @@
 #include <drm/drm_drv.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_gem_cma_helper.h>
-#include <drm/drm_irq.h>
 #include <drm/drm_managed.h>
 #include <drm/drm_probe_helper.h>
 
@@ -118,11 +117,6 @@ static const struct drm_driver tidss_driver = {
 	.date			= "20180215",
 	.major			= 1,
 	.minor			= 0,
-
-	.irq_preinstall		= tidss_irq_preinstall,
-	.irq_postinstall	= tidss_irq_postinstall,
-	.irq_handler		= tidss_irq_handler,
-	.irq_uninstall		= tidss_irq_uninstall,
 };
 
 static int tidss_probe(struct platform_device *pdev)
@@ -172,10 +166,11 @@ static int tidss_probe(struct platform_device *pdev)
 		ret = irq;
 		goto err_runtime_suspend;
 	}
+	tidss->irq = irq;
 
-	ret = drm_irq_install(ddev, irq);
+	ret = tidss_irq_install(ddev, irq);
 	if (ret) {
-		dev_err(dev, "drm_irq_install failed: %d\n", ret);
+		dev_err(dev, "tidss_irq_install failed: %d\n", ret);
 		goto err_runtime_suspend;
 	}
 
@@ -196,7 +191,7 @@ static int tidss_probe(struct platform_device *pdev)
 	return 0;
 
 err_irq_uninstall:
-	drm_irq_uninstall(ddev);
+	tidss_irq_uninstall(ddev);
 
 err_runtime_suspend:
 #ifndef CONFIG_PM
@@ -219,7 +214,7 @@ static int tidss_remove(struct platform_device *pdev)
 
 	drm_atomic_helper_shutdown(ddev);
 
-	drm_irq_uninstall(ddev);
+	tidss_irq_uninstall(ddev);
 
 #ifndef CONFIG_PM
 	/* If we don't have PM, we need to call suspend manually */

drivers/gpu/drm/tidss/tidss_drv.h

@@ -27,6 +27,8 @@ struct tidss_device {
 	unsigned int num_planes;
 	struct drm_plane *planes[TIDSS_MAX_PLANES];
 
+	unsigned int irq;
+
 	spinlock_t wait_lock;	/* protects the irq masks */
 	dispc_irq_t irq_mask;	/* enabled irqs in addition to wait_list */
 };

drivers/gpu/drm/tidss/tidss_irq.c

@@ -4,6 +4,9 @@
  * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
  */
 
+#include <linux/platform_device.h>
+
+#include <drm/drm_drv.h>
 #include <drm/drm_print.h>
 
 #include "tidss_crtc.h"
@@ -50,7 +53,7 @@ void tidss_irq_disable_vblank(struct drm_crtc *crtc)
 	spin_unlock_irqrestore(&tidss->wait_lock, flags);
 }
 
-irqreturn_t tidss_irq_handler(int irq, void *arg)
+static irqreturn_t tidss_irq_handler(int irq, void *arg)
 {
 	struct drm_device *ddev = (struct drm_device *)arg;
 	struct tidss_device *tidss = to_tidss(ddev);
@@ -90,7 +93,7 @@ void tidss_irq_resume(struct tidss_device *tidss)
 	spin_unlock_irqrestore(&tidss->wait_lock, flags);
 }
 
-void tidss_irq_preinstall(struct drm_device *ddev)
+static void tidss_irq_preinstall(struct drm_device *ddev)
 {
 	struct tidss_device *tidss = to_tidss(ddev);
 
@@ -104,7 +107,7 @@ void tidss_irq_preinstall(struct drm_device *ddev)
 	tidss_runtime_put(tidss);
 }
 
-int tidss_irq_postinstall(struct drm_device *ddev)
+static void tidss_irq_postinstall(struct drm_device *ddev)
 {
 	struct tidss_device *tidss = to_tidss(ddev);
 	unsigned long flags;
@@ -129,6 +132,22 @@ int tidss_irq_postinstall(struct drm_device *ddev)
 	spin_unlock_irqrestore(&tidss->wait_lock, flags);
 
 	tidss_runtime_put(tidss);
+}
+
+int tidss_irq_install(struct drm_device *ddev, unsigned int irq)
+{
+	int ret;
+
+	if (irq == IRQ_NOTCONNECTED)
+		return -ENOTCONN;
+
+	tidss_irq_preinstall(ddev);
+
+	ret = request_irq(irq, tidss_irq_handler, 0, ddev->driver->name, ddev);
+	if (ret)
+		return ret;
+
+	tidss_irq_postinstall(ddev);
 
 	return 0;
 }
@@ -140,4 +159,6 @@ void tidss_irq_uninstall(struct drm_device *ddev)
 	tidss_runtime_get(tidss);
 	dispc_set_irqenable(tidss->dispc, 0);
 	tidss_runtime_put(tidss);
+
+	free_irq(tidss->irq, ddev);
 }

drivers/gpu/drm/tidss/tidss_irq.h

@@ -67,10 +67,8 @@ struct tidss_device;
 void tidss_irq_enable_vblank(struct drm_crtc *crtc);
 void tidss_irq_disable_vblank(struct drm_crtc *crtc);
 
-void tidss_irq_preinstall(struct drm_device *ddev);
-int tidss_irq_postinstall(struct drm_device *ddev);
+int tidss_irq_install(struct drm_device *ddev, unsigned int irq);
 void tidss_irq_uninstall(struct drm_device *ddev);
-irqreturn_t tidss_irq_handler(int irq, void *arg);
 
 void tidss_irq_resume(struct tidss_device *tidss);