linux-kernel - Re: [PATCH 14/14] PCI: j721e: add suspend and resume support

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Date: Mon, 22 Jan 2024 23:36:08 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Thomas Richard <thomas.richard@...tlin.com>
Cc: Linus Walleij <linus.walleij@...aro.org>, Bartosz Golaszewski <brgl@...ev.pl>, 
	Andy Shevchenko <andy@...nel.org>, Tony Lindgren <tony@...mide.com>, 
	Haojian Zhuang <haojian.zhuang@...aro.org>, Vignesh R <vigneshr@...com>, 
	Aaro Koskinen <aaro.koskinen@....fi>, Janusz Krzysztofik <jmkrzyszt@...il.com>, 
	Andi Shyti <andi.shyti@...nel.org>, Peter Rosin <peda@...ntia.se>, Vinod Koul <vkoul@...nel.org>, 
	Kishon Vijay Abraham I <kishon@...nel.org>, Philipp Zabel <p.zabel@...gutronix.de>, 
	Tom Joseph <tjoseph@...ence.com>, Lorenzo Pieralisi <lpieralisi@...nel.org>, 
	Krzysztof Wilczyński <kw@...ux.com>, 
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, linux-gpio@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-omap@...r.kernel.org, linux-i2c@...r.kernel.org, 
	linux-phy@...ts.infradead.org, linux-pci@...r.kernel.org, 
	gregory.clement@...tlin.com, theo.lebrun@...tlin.com, 
	thomas.petazzoni@...tlin.com, u-kumar1@...com
Subject: Re: [PATCH 14/14] PCI: j721e: add suspend and resume support

On Mon, Jan 22, 2024 at 5:30 PM Thomas Richard
<thomas.richard@...tlin.com> wrote:
> On 1/15/24 21:13, Andy Shevchenko wrote:
> > On Mon, Jan 15, 2024 at 6:16 PM Thomas Richard
> > <thomas.richard@...tlin.com> wrote:

..

> >> +               if (pcie->reset_gpio)
> >
> > Dup, why?
>
> This pcie->reset_gpio corresponds to PERST# of PCIe endpoints.
> I assert it during suspend, because I have to deassert it (with a delay)
> during resume stage [1].

Ah, sorry for being unclear, I meant that gpiod_set_value*() already
has that check, you don't need it here.

> >> +                       gpiod_set_value_cansleep(pcie->reset_gpio, 0);

..

> >> +               if (pcie->reset_gpio) {
> >> +                       usleep_range(100, 200);
> >
> > fsleep() ?
> > Btw, why is it needed here, perhaps a comment?
>
> The comment should be the same than in the probe [1].
> Should I copy it? Or should I just add a reference to the probe?
>
> [1]
> https://elixir.bootlin.com/linux/v6.8-rc1/source/drivers/pci/controller/cadence/pci-j721e.c#L535

Either way works for me.

> >> +                       gpiod_set_value_cansleep(pcie->reset_gpio, 1);
> >> +               }

..

> >> +#define cdns_pcie_to_rc(p) container_of(p, struct cdns_pcie_rc, pcie)
> >
> > Is container_of.h included in this file?
>
> linux/container_of.h is included in linux/kernel.h.
> And linux/kernel.h is included in pcie-cadence.h
> (https://elixir.bootlin.com/linux/v6.8-rc1/source/drivers/pci/controller/cadence/pcie-cadence.h#L9).

Okay, so, try to clean up pcie-cadence.h so it won't use "proxy" headers.
There is an IWYU (include what you use) principle, please follow it.

-- 
With Best Regards,
Andy Shevchenko