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Date: Mon, 29 Jan 2024 16:16:47 -0600
From: Bjorn Helgaas <helgaas@kernel.org>
To: Thomas Richard <thomas.richard@bootlin.com>
Cc: Linus Walleij <linus.walleij@linaro.org>,
	Bartosz Golaszewski <brgl@bgdev.pl>,
	Andy Shevchenko <andy@kernel.org>, Tony Lindgren <tony@atomide.com>,
	Haojian Zhuang <haojian.zhuang@linaro.org>,
	Vignesh R <vigneshr@ti.com>, Aaro Koskinen <aaro.koskinen@iki.fi>,
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	Andi Shyti <andi.shyti@kernel.org>, Peter Rosin <peda@axentia.se>,
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	Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= <kw@linux.com>,
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Subject: Re: [PATCH v2 13/15] PCI: cadence: add resume support to
 cdns_pcie_host_setup()
Message-ID: <20240129221647.GA477676@bhelgaas>
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In-Reply-To: <20240126214336.GA453589@bhelgaas>

On Fri, Jan 26, 2024 at 03:43:39PM -0600, Bjorn Helgaas wrote:
> In subject, capitalize "Add ..." to follow historical convention.
> Also the other driver/pci/ patches.
> 
> On Fri, Jan 26, 2024 at 03:36:55PM +0100, Thomas Richard wrote:
> > From: Théo Lebrun <theo.lebrun@bootlin.com>
> > 
> > That function mixes probe structure init and hardware config.
> > The whole hardware config part must be done at resume after a suspend to
> > ram.
> > We therefore pass it a boolean flag determining if we are at probe or at
> > resume.
> ...

> This is pretty similar but slightly different from the DWC pattern:
> 
>   imx6_pcie_probe
>     ... do structure init ...
>     if (RC)
>       dw_pcie_host_init
> 	pp->ops->init
> 	  imx6_pcie_host_init
> 
>   imx6_pcie_resume_noirq
>     imx6_pcie_host_init
> 
>   j721e_pcie_probe
>     j721e_pcie_ctrl_init
>     if (RC)
>       cdns_pcie_host_setup(true)
> 
>   j721e_pcie_resume_noirq
>     j721e_pcie_ctrl_init
>     if (RC)
>       cdns_pcie_host_setup(false)
> 
> It'd be super nice to have them the same.  Passing in a "probe" flag
> works but seems a little harder to read in cdns_pcie_host_setup() and
> you have to keep track of what it means in the callers.

Maybe a better way to say this is that this patch uses the "probe"
flag to select the behavior of cdns_pcie_host_setup(), and I think it
would be nicer to split those two behaviors into separate functions.

Bjorn