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Message-ID: <0bfff433-e216-6f9d-d225-9f07ac48013a@xs4all.nl>
Date: Tue, 11 Jan 2022 11:25:32 +0100
From: Hans Verkuil <hverkuil-cisco@...all.nl>
To: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
linux-media@...r.kernel.org,
Mauro Carvalho Chehab <mchehab@...nel.org>,
"Lad, Prabhakar" <prabhakar.csengg@...il.com>
Cc: Rob Herring <robh+dt@...nel.org>,
Andy Shevchenko <andy.shevchenko@...il.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 06/13] media: davinci: vpif: Use
platform_get_irq_optional() to get the interrupt
Hi Prabhakar,
On 11/01/2022 01:23, Lad Prabhakar wrote:
> 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().
>
> While at it, propagate error code in case devm_request_irq() fails
> instead of returning -EINVAL in vpif_display.c.
Please note that this patch clashes with [1], for which I just posted a PR [2].
So once [2] is merged you'll need to rebase this patch.
Regards,
Hans
[1] https://patchwork.linuxtv.org/project/linux-media/list/?series=7000
[2] https://patchwork.linuxtv.org/project/linux-media/patch/63d723aa-b6a3-ff42-c3e4-f1fcb979be11@xs4all.nl/
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
> v1->v2
> * Used DEFINE_RES_IRQ_NAMED() macro
> * Considered IRQ0 as no IRQ.
> ---
> drivers/media/platform/davinci/vpif.c | 18 ++++++++------
> drivers/media/platform/davinci/vpif_capture.c | 24 ++++++++++++-------
> drivers/media/platform/davinci/vpif_display.c | 21 ++++++++++------
> 3 files changed, 40 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/media/platform/davinci/vpif.c b/drivers/media/platform/davinci/vpif.c
> index 5a89d885d0e3..2dbb464399cc 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>
> @@ -425,9 +427,10 @@ EXPORT_SYMBOL(vpif_channel_getfid);
>
> static int vpif_probe(struct platform_device *pdev)
> {
> - static struct resource *res_irq;
> + 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))
> @@ -453,19 +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);
> - if (!res_irq) {
> - dev_warn(&pdev->dev, "Missing IRQ resource.\n");
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0) {
> pm_runtime_put(&pdev->dev);
> - return -EINVAL;
> + return irq;
> }
> + res_irq = (struct resource)DEFINE_RES_IRQ_NAMED(irq, of_node_full_name(pdev->dev.of_node));
> + res_irq.flags |= irq_get_trigger_type(irq);
>
> pdev_capture = devm_kzalloc(&pdev->dev, sizeof(*pdev_capture),
> GFP_KERNEL);
> if (pdev_capture) {
> pdev_capture->name = "vpif_capture";
> pdev_capture->id = -1;
> - pdev_capture->resource = res_irq;
> + pdev_capture->resource = &res_irq;
> pdev_capture->num_resources = 1;
> pdev_capture->dev.dma_mask = pdev->dev.dma_mask;
> pdev_capture->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
> @@ -480,7 +484,7 @@ static int vpif_probe(struct platform_device *pdev)
> if (pdev_display) {
> pdev_display->name = "vpif_display";
> pdev_display->id = -1;
> - pdev_display->resource = res_irq;
> + pdev_display->resource = &res_irq;
> pdev_display->num_resources = 1;
> pdev_display->dev.dma_mask = pdev->dev.dma_mask;
> pdev_display->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
> diff --git a/drivers/media/platform/davinci/vpif_capture.c b/drivers/media/platform/davinci/vpif_capture.c
> index 8fe55374c5a3..aaf8a0ec98ff 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 +1631,22 @@ 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 (1) {
> + int irq;
> +
> + err = platform_get_irq_optional(pdev, res_idx);
> + if (err < 0 && err != -ENXIO)
> + goto vpif_unregister;
> + if (err > 0)
> + irq = err;
> + else
> + break;
> +
> + err = devm_request_irq(&pdev->dev, irq, 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..c4a0c4a4448c 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 +1244,21 @@ 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 (1) {
> + int irq;
> +
> + err = platform_get_irq_optional(pdev, res_idx);
> + if (err < 0 && err != -ENXIO)
> + goto vpif_unregister;
> + if (err > 0)
> + irq = err;
> + else
> + break;
> +
> + err = devm_request_irq(&pdev->dev, irq, 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;
> }
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