[PATCH 06/13] media: davinci: vpif: Use platform_get_irq_optional() to get the interrupt

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
To: linux-media@vger.kernel.org, "Lad,
	Prabhakar" <prabhakar.csengg@gmail.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Hans Verkuil <hverkuil-cisco@xs4all.nl>,
	Rob Herring <robh+dt@kernel.org>,
	linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Subject: [PATCH 06/13] media: davinci: vpif: Use platform_get_irq_optional() to get the interrupt
Date: Thu, 23 Dec 2021 17:30:07 +0000	[thread overview]
Message-ID: <20211223173015.22251-7-prabhakar.mahadev-lad.rj@bp.renesas.com> (raw)
In-Reply-To: <20211223173015.22251-1-prabhakar.mahadev-lad.rj@bp.renesas.com>

platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
allocation of IRQ resources in DT core code, this causes an issue
when using hierarchical interrupt domains using "interrupts" property
in the node as this bypasses the hierarchical setup and messes up the
irq chaining.

In preparation for removal of static setup of IRQ resource from DT core
code use platform_get_irq_optional().

Also this patch propagates error code in case devm_request_irq()
fails instead of returing -EINVAL.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
 drivers/media/platform/davinci/vpif.c         | 17 ++++++++++++++---
 drivers/media/platform/davinci/vpif_capture.c | 16 +++++++---------
 drivers/media/platform/davinci/vpif_display.c | 13 ++++++-------
 3 files changed, 27 insertions(+), 19 deletions(-)

diff --git a/drivers/media/platform/davinci/vpif.c b/drivers/media/platform/davinci/vpif.c
index 5a89d885d0e3..c3c78e1afdda 100644
--- a/drivers/media/platform/davinci/vpif.c
+++ b/drivers/media/platform/davinci/vpif.c
@@ -20,8 +20,10 @@
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/io.h>
+#include <linux/irq.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/spinlock.h>
@@ -428,6 +430,7 @@ static int vpif_probe(struct platform_device *pdev)
 	static struct resource *res_irq;
 	struct platform_device *pdev_capture, *pdev_display;
 	struct device_node *endpoint = NULL;
+	int irq;
 
 	vpif_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(vpif_base))
@@ -453,12 +456,20 @@ static int vpif_probe(struct platform_device *pdev)
 	 * For DT platforms, manually create platform_devices for
 	 * capture/display drivers.
 	 */
-	res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		pm_runtime_put(&pdev->dev);
+		return irq;
+	}
+	res_irq = devm_kzalloc(&pdev->dev, sizeof(*res_irq), GFP_KERNEL);
 	if (!res_irq) {
-		dev_warn(&pdev->dev, "Missing IRQ resource.\n");
 		pm_runtime_put(&pdev->dev);
-		return -EINVAL;
+		return -ENOMEM;
 	}
+	res_irq->flags = IORESOURCE_IRQ | irq_get_trigger_type(irq);
+	res_irq->start = irq;
+	res_irq->end = irq;
+	res_irq->name = dev_of_node(&pdev->dev) ? of_node_full_name(pdev->dev.of_node) : NULL;
 
 	pdev_capture = devm_kzalloc(&pdev->dev, sizeof(*pdev_capture),
 				    GFP_KERNEL);
diff --git a/drivers/media/platform/davinci/vpif_capture.c b/drivers/media/platform/davinci/vpif_capture.c
index 8fe55374c5a3..c1a67a221743 100644
--- a/drivers/media/platform/davinci/vpif_capture.c
+++ b/drivers/media/platform/davinci/vpif_capture.c
@@ -1607,7 +1607,6 @@ static __init int vpif_probe(struct platform_device *pdev)
 {
 	struct vpif_subdev_info *subdevdata;
 	struct i2c_adapter *i2c_adap;
-	struct resource *res;
 	int subdev_count;
 	int res_idx = 0;
 	int i, err;
@@ -1632,15 +1631,14 @@ static __init int vpif_probe(struct platform_device *pdev)
 		goto vpif_free;
 	}
 
-	while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, res_idx))) {
-		err = devm_request_irq(&pdev->dev, res->start, vpif_channel_isr,
-					IRQF_SHARED, VPIF_DRIVER_NAME,
-					(void *)(&vpif_obj.dev[res_idx]->
-					channel_id));
-		if (err) {
-			err = -EINVAL;
+	while ((err = platform_get_irq_optional(pdev, res_idx)) != -ENXIO) {
+		if (err < 0)
+			goto vpif_unregister;
+		err = devm_request_irq(&pdev->dev, err, vpif_channel_isr,
+				       IRQF_SHARED, VPIF_DRIVER_NAME,
+				       (void *)(&vpif_obj.dev[res_idx]->channel_id));
+		if (err)
 			goto vpif_unregister;
-		}
 		res_idx++;
 	}
 
diff --git a/drivers/media/platform/davinci/vpif_display.c b/drivers/media/platform/davinci/vpif_display.c
index 59f6b782e104..9c552ea3787e 100644
--- a/drivers/media/platform/davinci/vpif_display.c
+++ b/drivers/media/platform/davinci/vpif_display.c
@@ -1221,7 +1221,6 @@ static __init int vpif_probe(struct platform_device *pdev)
 {
 	struct vpif_subdev_info *subdevdata;
 	struct i2c_adapter *i2c_adap;
-	struct resource *res;
 	int subdev_count;
 	int res_idx = 0;
 	int i, err;
@@ -1245,13 +1244,13 @@ static __init int vpif_probe(struct platform_device *pdev)
 		goto vpif_free;
 	}
 
-	while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, res_idx))) {
-		err = devm_request_irq(&pdev->dev, res->start, vpif_channel_isr,
-					IRQF_SHARED, VPIF_DRIVER_NAME,
-					(void *)(&vpif_obj.dev[res_idx]->
-					channel_id));
+	while ((err = platform_get_irq_optional(pdev, res_idx)) != -ENXIO) {
+		if (err < 0)
+			goto vpif_unregister;
+		err = devm_request_irq(&pdev->dev, err, vpif_channel_isr,
+				       IRQF_SHARED, VPIF_DRIVER_NAME,
+				       (void *)(&vpif_obj.dev[res_idx]->channel_id));
 		if (err) {
-			err = -EINVAL;
 			vpif_err("VPIF IRQ request failed\n");
 			goto vpif_unregister;
 		}
-- 
2.17.1

