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Message-ID: <27eff12c-6d80-48e3-82b9-3a4aa90ce76c@bootlin.com>
Date: Mon, 22 Jan 2024 15:28:05 +0100
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Subject: Re: [PATCH 11/14] phy: cadence-torrent: add suspend and resume
 support
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To: Philipp Zabel <p.zabel@pengutronix.de>,
 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>,
 Janusz Krzysztofik <jmkrzyszt@gmail.com>, Andi Shyti
 <andi.shyti@kernel.org>, Peter Rosin <peda@axentia.se>,
 Vinod Koul <vkoul@kernel.org>, Kishon Vijay Abraham I <kishon@kernel.org>,
 Tom Joseph <tjoseph@cadence.com>, 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>
Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
 linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org,
 linux-i2c@vger.kernel.org, linux-phy@lists.infradead.org,
 linux-pci@vger.kernel.org, gregory.clement@bootlin.com,
 theo.lebrun@bootlin.com, thomas.petazzoni@bootlin.com, u-kumar1@ti.com
References: <20240102-j7200-pcie-s2r-v1-0-84e55da52400@bootlin.com>
 <20240102-j7200-pcie-s2r-v1-11-84e55da52400@bootlin.com>
 <cf6440c08b8b7382e6693e18cdd29325aaea9cc9.camel@pengutronix.de>
From: Thomas Richard <thomas.richard@bootlin.com>
In-Reply-To: <cf6440c08b8b7382e6693e18cdd29325aaea9cc9.camel@pengutronix.de>
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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@bootlin.com>
>>
>> Signed-off-by: Thomas Richard <thomas.richard@bootlin.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