linux-kernel - Re: [PATCH v3 14/18] phy: cadence-torrent: add suspend and resume support

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Message-ID: <e009fda0-3dd1-4834-8dce-73756c1e32f6@bootlin.com>
Date: Fri, 16 Feb 2024 08:36:41 +0100
From: Thomas Richard <thomas.richard@...tlin.com>
To: Andy Shevchenko <andy@...nel.org>
Cc: Linus Walleij <linus.walleij@...aro.org>,
 Bartosz Golaszewski <brgl@...ev.pl>, 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>,
 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 v3 14/18] phy: cadence-torrent: add suspend and resume
 support

On 2/15/24 16:46, Andy Shevchenko wrote:
>> +static int cdns_torrent_phy_suspend_noirq(struct device *dev)
>> +{
>> +	struct cdns_torrent_phy *cdns_phy = dev_get_drvdata(dev);
>> +	int i;
> 
> Why signed?

In the for loop below, the i variable is compared to
cdns_phy->nsubnodes, which is an int.

https://elixir.bootlin.com/linux/latest/source/drivers/phy/cadence/phy-cadence-torrent.c#L360

> 
>> +	reset_control_assert(cdns_phy->phy_rst);
>> +	reset_control_assert(cdns_phy->apb_rst);
>> +	for (i = 0; i < cdns_phy->nsubnodes; i++)
>> +		reset_control_assert(cdns_phy->phys[i].lnk_rst);
>> +
>> +	if (cdns_phy->already_configured)
>> +		cdns_phy->already_configured = 0;
>> +	else
>> +		clk_disable_unprepare(cdns_phy->clk);
>> +
>> +	return 0;
>> +}
>> +
>> +static int cdns_torrent_phy_resume_noirq(struct device *dev)
>> +{
>> +	struct cdns_torrent_phy *cdns_phy = dev_get_drvdata(dev);
>> +	int node = cdns_phy->nsubnodes;
>> +	int ret, i;
> 
> Ditto>

Same reason

>> +	ret = cdns_torrent_clk(cdns_phy);
>> +	if (ret)
>> +		goto clk_cleanup;
>> +
>> +	/* Enable APB */
>> +	reset_control_deassert(cdns_phy->apb_rst);
>> +
>> +	if (cdns_phy->nsubnodes > 1) {
>> +		ret = cdns_torrent_phy_configure_multilink(cdns_phy);
>> +		if (ret)
>> +			goto put_lnk_rst;
>> +	}
>> +
>> +	return 0;
>> +
>> +put_lnk_rst:
>> +	for (i = 0; i < node; i++)
>> +		reset_control_assert(cdns_phy->phys[i].lnk_rst);
>> +	reset_control_assert(cdns_phy->apb_rst);
>> +	clk_disable_unprepare(cdns_phy->clk);
>> +clk_cleanup:
>> +	cdns_torrent_clk_cleanup(cdns_phy);
>> +	return ret;
>> +}
> 
-- 
Thomas Richard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com