linux-kernel - Re: [PATCH 01/13] media: vsp1: Use platform_get

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Date:   Thu, 30 Dec 2021 12:32:58 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        linux-media <linux-media@...r.kernel.org>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Rob Herring <robh+dt@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH 01/13] media: vsp1: Use platform_get_irq() to get the interrupt

Hi Laurent,

Thank you for the review.

On Thu, Dec 30, 2021 at 12:06 AM Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
>
> Hi Prabhakar,
>
> Thank you for the patch.
>
> On Thu, Dec 23, 2021 at 05:30:02PM +0000, 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().
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>
> Will you get this merged with the whole series, or should I take it in
> my tree ?
>
I intend to get this merged with the whole series, just to make sure
all of them are part of the same release. If there is an issue that's
OK too.

> > ---
> >  drivers/media/platform/vsp1/vsp1_drv.c | 13 +++++--------
> >  1 file changed, 5 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/media/platform/vsp1/vsp1_drv.c b/drivers/media/platform/vsp1/vsp1_drv.c
> > index c9044785b903..bbba91a65a0f 100644
> > --- a/drivers/media/platform/vsp1/vsp1_drv.c
> > +++ b/drivers/media/platform/vsp1/vsp1_drv.c
> > @@ -794,7 +794,6 @@ static int vsp1_probe(struct platform_device *pdev)
> >  {
> >       struct vsp1_device *vsp1;
> >       struct device_node *fcp_node;
> > -     struct resource *irq;
> >       unsigned int i;
> >       int ret;
> >
> > @@ -813,14 +812,12 @@ static int vsp1_probe(struct platform_device *pdev)
> >       if (IS_ERR(vsp1->mmio))
> >               return PTR_ERR(vsp1->mmio);
> >
> > -     irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> > -     if (!irq) {
> > -             dev_err(&pdev->dev, "missing IRQ\n");
> > -             return -EINVAL;
> > -     }
> > +     ret = platform_get_irq(pdev, 0);
> > +     if (ret < 0)
> > +             return ret;
>
> I'd use an int irq local variable, but it doesn't matter much. Up to
> you.
>
Anyway I plan to post a v2 for this series fixing a couple of comments
from Andy. Will use a local variable irq then and include your RB tag.

> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>
> >
> > -     ret = devm_request_irq(&pdev->dev, irq->start, vsp1_irq_handler,
> > -                           IRQF_SHARED, dev_name(&pdev->dev), vsp1);
> > +     ret = devm_request_irq(&pdev->dev, ret, vsp1_irq_handler,
> > +                            IRQF_SHARED, dev_name(&pdev->dev), vsp1);
> >       if (ret < 0) {
> >               dev_err(&pdev->dev, "failed to request IRQ\n");
> >               return ret;
>
Cheers,
Prabhakar