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From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: Tue, 23 Apr 2024 11:42:12 +0200
Message-ID: <CAMuHMdVnKX23yi7ir1LVxfXAMeeWMFzM+cdgSSTNjpn1OnC2xw@mail.gmail.com>
Subject: Re: [PATCH v5 01/11] gpio: pca953x: move suspend()/resume() to suspend_noirq()/resume_noirq()
To: Thomas Richard <thomas.richard@bootlin.com>
Cc: Linus Walleij <linus.walleij@linaro.org>, Bartosz Golaszewski <brgl@bgdev.pl>, 
	Tony Lindgren <tony@atomide.com>, Aaro Koskinen <aaro.koskinen@iki.fi>, 
	Janusz Krzysztofik <jmkrzyszt@gmail.com>, Vignesh R <vigneshr@ti.com>, 
	Andi Shyti <andi.shyti@kernel.org>, Peter Rosin <peda@axentia.se>, 
	Lorenzo Pieralisi <lpieralisi@kernel.org>, =?UTF-8?Q?Krzysztof_Wilczy=C5=84ski?= <kw@linux.com>, 
	Rob Herring <robh@kernel.org>, Bjorn Helgaas <bhelgaas@google.com>, 
	Siddharth Vadapalli <s-vadapalli@ti.com>, linux-gpio@vger.kernel.org, 
	linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, 
	linux-i2c@vger.kernel.org, linux-pci@vger.kernel.org, 
	linux-arm-kernel@lists.infradead.org, gregory.clement@bootlin.com, 
	theo.lebrun@bootlin.com, thomas.petazzoni@bootlin.com, u-kumar1@ti.com, 
	Bartosz Golaszewski <bartosz.golaszewski@linaro.org>, 
	Andy Shevchenko <andy.shevchenko@gmail.com>, Wolfram Sang <wsa+renesas@sang-engineering.com>, 
	Linux-Renesas <linux-renesas-soc@vger.kernel.org>
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Hi Thomas,

On Tue, Apr 16, 2024 at 3:31=E2=80=AFPM Thomas Richard
<thomas.richard@bootlin.com> wrote:
> Some IOs can be needed during suspend_noirq()/resume_noirq().
> So move suspend()/resume() to noirq.
>
> Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
> Acked-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
> Signed-off-by: Thomas Richard <thomas.richard@bootlin.com>

Thanks for your patch, which is now commit 86eb98127332748f ("gpio:
pca953x: move suspend()/resume() to suspend_noirq()/resume_noirq()")
in i2c-host/i2c/i2c-host.

This patch causes regressions on e.g. Salvator-XS.

    s2idle:

         Freezing user space processes
         Freezing user space processes completed (elapsed 0.006 seconds)
         OOM killer disabled.
         Freezing remaining freezable tasks
         Freezing remaining freezable tasks completed (elapsed 0.003 second=
s)
         sd 0:0:0:0: [sda] Synchronizing SCSI cache
         ata1.00: Entering standby power mode
        +i2c-rcar e66d8000.i2c: error -16 : 10000005
        +pca953x 4-0020: Failed to sync GPIO dir registers: -16
        +pca953x 4-0020: Failed to restore register map: -16
        +pca953x 4-0020: PM: dpm_run_callback(): pca953x_resume_noirq
returns -16
        +pca953x 4-0020: PM: failed to resume async noirq: error -16

    s2ram:

         Detected VIPT I-cache on CPU7
         CPU7: Booted secondary processor 0x0000000103 [0x410fd034]
         CPU7 is up
        +i2c-rcar e66d8000.i2c: error -110 : 10000001
        +pca953x 4-0020: Failed to sync GPIO dir registers: -110
        +pca953x 4-0020: Failed to restore register map: -110
        +pca953x 4-0020: PM: dpm_run_callback(): pca953x_resume_noirq
returns -110
        +pca953x 4-0020: PM: failed to resume async noirq: error -110
         usb usb1: root hub lost power or was reset
         ...
         PM: suspend exit
         ata1: link resume succeeded after 1 retries
        -ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
        -sd 0:0:0:0: [sda] Starting disk
        -ata1.00: configured for UDMA/133
        -ata1.00: Entering active power mode
        +ata1: SATA link down (SStatus 0 SControl 300)
        +ata1: link resume succeeded after 1 retries
        +ata1: SATA link down (SStatus 0 SControl 300)
        +ata1: limiting SATA link speed to <unknown>
        +ata1: link resume succeeded after 1 retries
        +ata1: SATA link down (SStatus 0 SControl 3F0)
        +ata1.00: disable device
        +ata1.00: detaching (SCSI 0:0:0:0)
        +sd 0:0:0:0: [sda] Synchronizing SCSI cache
        +sd 0:0:0:0: [sda] Synchronize Cache(10) failed: Result:
hostbyte=3D0x04 driverbyte=3DDRIVER_OK

    When trying to read from /dev/sda afterwards:

        ata1: link resume succeeded after 1 retries
        ata1: SATA link down (SStatus 0 SControl 3F0)
        ata1.00: disable device
        ata1.00: detaching (SCSI 0:0:0:0)
        device offline error, dev sda, sector 0 op 0x0:(READ) flags
0x80700 phys_seg 4 prio class 0
        device offline error, dev sda, sector 0 op 0x0:(READ) flags
0x0 phys_seg 1 prio class 0
        Buffer I/O error on dev sda, logical block 0, async page read
        sd 0:0:0:0: [sda] Synchronizing SCSI cache
        sd 0:0:0:0: [sda] Synchronize Cache(10) failed: Result:
hostbyte=3D0x04 driverbyte=3DDRIVER_OK

All issues above are fixed by reverting this commit.

> --- a/drivers/gpio/gpio-pca953x.c
> +++ b/drivers/gpio/gpio-pca953x.c
> @@ -1234,7 +1234,7 @@ static void pca953x_save_context(struct pca953x_chi=
p *chip)
>         regcache_cache_only(chip->regmap, true);
>  }
>
> -static int pca953x_suspend(struct device *dev)
> +static int pca953x_suspend_noirq(struct device *dev)
>  {
>         struct pca953x_chip *chip =3D dev_get_drvdata(dev);
>
> @@ -1248,7 +1248,7 @@ static int pca953x_suspend(struct device *dev)
>         return 0;
>  }
>
> -static int pca953x_resume(struct device *dev)
> +static int pca953x_resume_noirq(struct device *dev)
>  {
>         struct pca953x_chip *chip =3D dev_get_drvdata(dev);
>         int ret;
> @@ -1268,7 +1268,8 @@ static int pca953x_resume(struct device *dev)
>         return ret;
>  }
>
> -static DEFINE_SIMPLE_DEV_PM_OPS(pca953x_pm_ops, pca953x_suspend, pca953x=
_resume);
> +static DEFINE_NOIRQ_DEV_PM_OPS(pca953x_pm_ops,
> +                              pca953x_suspend_noirq, pca953x_resume_noir=
q);
>
>  /* convenience to stop overlong match-table lines */
>  #define OF_653X(__nrgpio, __int) ((void *)(__nrgpio | PCAL653X_TYPE | __=
int))
>

Gr{oetje,eeting}s,

                        Geert

--=20
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k=
org

In personal conversations with technical people, I call myself a hacker. Bu=
t
when I'm talking to journalists I just say "programmer" or something like t=
hat.
                                -- Linus Torvalds