linux-kernel - Re: [PATCH 11/14] phy: cadence-torrent: add suspend and resume support

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Message-ID: <27eff12c-6d80-48e3-82b9-3a4aa90ce76c@bootlin.com>
Date: Mon, 22 Jan 2024 15:28:05 +0100
From: Thomas Richard <thomas.richard@...tlin.com>
To: Philipp Zabel <p.zabel@...gutronix.de>,
 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>,
 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>
Cc: 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 11/14] phy: cadence-torrent: add suspend and resume
 support

Hello Philipp,

On 1/17/24 16:12, Philipp Zabel wrote:
> Hi Thomas,
> 
> On Mo, 2024-01-15 at 17:14 +0100, Thomas Richard wrote:
>> Add suspend and resume support.
>> The alread_configured flag is cleared during suspend stage to force the
>> phy initialization during the resume stage.
>>
>> Based on the work of Théo Lebrun <theo.lebrun@...tlin.com>
>>
>> Signed-off-by: Thomas Richard <thomas.richard@...tlin.com>
>> ---
>>  drivers/phy/cadence/phy-cadence-torrent.c | 57 +++++++++++++++++++++++++++++++
>>  1 file changed, 57 insertions(+)
>>
>> diff --git a/drivers/phy/cadence/phy-cadence-torrent.c b/drivers/phy/cadence/phy-cadence-torrent.c
>> index 70413fca5776..31b2594e5942 100644
>> --- a/drivers/phy/cadence/phy-cadence-torrent.c
>> +++ b/drivers/phy/cadence/phy-cadence-torrent.c
>> @@ -3006,6 +3006,62 @@ static void cdns_torrent_phy_remove(struct platform_device *pdev)
> [...]
>> +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;
>> +
>> +	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_put(cdns_phy->phys[i].lnk_rst);
> 
> What is this intended to do? I expect this to explode in _remove, where
> the lnk_rst are put again. Should this be:
> 
> 		reset_control_assert(cdns_phy->phys[i].lnk_rst);
> 
> ?

Yes indeed, it's reset_control_assert instead of reset_control_put.

Thanks for the review.

Regards,

-- 
Thomas Richard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com