| Message ID | 20211221175322.7096-3-prabhakar.mahadev-lad.rj@bp.renesas.com (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Geert Uytterhoeven |
| Headers | show |
| Series | i2c/busses: Use platform_get_irq/_optional() variants to fetch IRQ's | expand |
On Tue, Dec 21, 2021 at 7:21 PM Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> 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() for DT users only. > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
On Tue, Dec 21, 2021 at 05:53:21PM +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_optional() for DT users only. > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> Tested on a Renesas R-Car Gen3 SoC (M3-W) and IIC port still works and no false positive printouts in the kernel log: Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
On Wed, Dec 22, 2021 at 2:41 PM Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> 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() for DT users only. ... > + if (np) { Same comments as per your other patches, i.e. Why is this check here? > + int irq; > + > + while ((irq = platform_get_irq_optional(dev, k)) != -ENXIO) { Consider 0 as no IRQ. > + if (irq < 0) > + return irq; > + ret = devm_request_irq(&dev->dev, irq, sh_mobile_i2c_isr, > + 0, dev_name(&dev->dev), pd); > if (ret) { > - dev_err(&dev->dev, "cannot request IRQ %pa\n", &n); > + dev_err(&dev->dev, "cannot request IRQ %d\n", irq); > return ret; > } > + k++; > + }; > + } else { > + struct resource *res; > + resource_size_t n; > + > + while ((res = platform_get_resource(dev, IORESOURCE_IRQ, k))) { > + for (n = res->start; n <= res->end; n++) { > + ret = devm_request_irq(&dev->dev, n, sh_mobile_i2c_isr, > + 0, dev_name(&dev->dev), pd); > + if (ret) { > + dev_err(&dev->dev, "cannot request IRQ %pa\n", &n); > + return ret; > + } > + } > + k++; > } > - k++; > }
Hi Andy, Thank you for the review. > -----Original Message----- > From: Andy Shevchenko <andy.shevchenko@gmail.com> > Sent: 25 December 2021 17:49 > To: Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@bp.renesas.com> > Cc: Florian Fainelli <f.fainelli@gmail.com>; Ray Jui <rjui@broadcom.com>; Scott Branden > <sbranden@broadcom.com>; bcm-kernel-feedback-list <bcm-kernel-feedback-list@broadcom.com>; Nicolas > Saenz Julienne <nsaenz@kernel.org>; Chris Brandt <Chris.Brandt@renesas.com>; Wolfram Sang > <wsa+renesas@sang-engineering.com>; linux-i2c <linux-i2c@vger.kernel.org>; linux-rpi-kernel <linux- > rpi-kernel@lists.infradead.org>; linux-arm Mailing List <linux-arm-kernel@lists.infradead.org>; Linux- > Renesas <linux-renesas-soc@vger.kernel.org>; Linux Kernel Mailing List <linux-kernel@vger.kernel.org>; > Prabhakarprabhakar.csengg@gmail.com > Subject: Re: [PATCH v2 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to get the interrupt > > On Wed, Dec 22, 2021 at 2:41 PM Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> 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() for DT users only. > > ... > > > + if (np) { > > Same comments as per your other patches, i.e. > Why is this check here? > Because the interrupt resource has range of interrupts in one IRQ resource [0]. Let me know if there is any other alternative way to avoid such case. > > + int irq; > > + > > + while ((irq = platform_get_irq_optional(dev, k)) != > > + -ENXIO) { > > Consider 0 as no IRQ. > OK. [0] https://elixir.bootlin.com/linux/v5.16-rc6/source/arch/sh/kernel/cpu/sh4a/setup-sh7724.c#L454 Cheers, Prabhakar > > + if (irq < 0) > > + return irq; > > + ret = devm_request_irq(&dev->dev, irq, sh_mobile_i2c_isr, > > + 0, dev_name(&dev->dev), > > + pd); > > if (ret) { > > - dev_err(&dev->dev, "cannot request IRQ %pa\n", &n); > > + dev_err(&dev->dev, "cannot request IRQ > > + %d\n", irq); > > return ret; > > } > > + k++; > > + }; > > + } else { > > + struct resource *res; > > + resource_size_t n; > > + > > + while ((res = platform_get_resource(dev, IORESOURCE_IRQ, k))) { > > + for (n = res->start; n <= res->end; n++) { > > + ret = devm_request_irq(&dev->dev, n, sh_mobile_i2c_isr, > > + 0, dev_name(&dev->dev), pd); > > + if (ret) { > > + dev_err(&dev->dev, "cannot request IRQ %pa\n", &n); > > + return ret; > > + } > > + } > > + k++; > > } > > - k++; > > } > > -- > With Best Regards, > Andy Shevchenko
On Sun, Dec 26, 2021 at 1:45 AM Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote: > > On Wed, Dec 22, 2021 at 2:41 PM Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote: ... > > > + if (np) { > > > > Same comments as per your other patches, i.e. > > Why is this check here? > > > Because the interrupt resource has range of interrupts in one IRQ resource [0]. Let me know if there is any other alternative way to avoid such case. Shouldn't be fixed in platform_get_irq_optional() to return IRQ by index for all cases? > [0] https://elixir.bootlin.com/linux/v5.16-rc6/source/arch/sh/kernel/cpu/sh4a/setup-sh7724.c#L454
On Sun, Dec 26, 2021 at 8:41 AM Andy Shevchenko <andy.shevchenko@gmail.com> wrote: > > On Sun, Dec 26, 2021 at 1:45 AM Prabhakar Mahadev Lad > <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote: > > > On Wed, Dec 22, 2021 at 2:41 PM Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote: > > ... > > > > > + if (np) { > > > > > > Same comments as per your other patches, i.e. > > > Why is this check here? > > > > > Because the interrupt resource has range of interrupts in one IRQ resource [0]. Let me know if there is any other alternative way to avoid such case. > > Shouldn't be fixed in platform_get_irq_optional() to return IRQ by > index for all cases? > Sorry, I don't get you here. Wasn't your earlier comment for np check? Cheers, Prabhakar
On Tue, Dec 21, 2021 at 05:53:21PM +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_optional() for DT users only. > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> Applied to for-next, thanks!
diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c index 7b8caf172851..9754849dbb23 100644 --- a/drivers/i2c/busses/i2c-sh_mobile.c +++ b/drivers/i2c/busses/i2c-sh_mobile.c @@ -830,20 +830,38 @@ static void sh_mobile_i2c_release_dma(struct sh_mobile_i2c_data *pd) static int sh_mobile_i2c_hook_irqs(struct platform_device *dev, struct sh_mobile_i2c_data *pd) { - struct resource *res; - resource_size_t n; + struct device_node *np = dev_of_node(&dev->dev); int k = 0, ret; - while ((res = platform_get_resource(dev, IORESOURCE_IRQ, k))) { - for (n = res->start; n <= res->end; n++) { - ret = devm_request_irq(&dev->dev, n, sh_mobile_i2c_isr, - 0, dev_name(&dev->dev), pd); + if (np) { + int irq; + + while ((irq = platform_get_irq_optional(dev, k)) != -ENXIO) { + if (irq < 0) + return irq; + ret = devm_request_irq(&dev->dev, irq, sh_mobile_i2c_isr, + 0, dev_name(&dev->dev), pd); if (ret) { - dev_err(&dev->dev, "cannot request IRQ %pa\n", &n); + dev_err(&dev->dev, "cannot request IRQ %d\n", irq); return ret; } + k++; + }; + } else { + struct resource *res; + resource_size_t n; + + while ((res = platform_get_resource(dev, IORESOURCE_IRQ, k))) { + for (n = res->start; n <= res->end; n++) { + ret = devm_request_irq(&dev->dev, n, sh_mobile_i2c_isr, + 0, dev_name(&dev->dev), pd); + if (ret) { + dev_err(&dev->dev, "cannot request IRQ %pa\n", &n); + return ret; + } + } + k++; } - k++; } return k > 0 ? 0 : -ENOENT;
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() for DT users only. Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> --- v1->v2 * Dropped IRQ0 check * Simplified code --- drivers/i2c/busses/i2c-sh_mobile.c | 34 +++++++++++++++++++++++------- 1 file changed, 26 insertions(+), 8 deletions(-)