linux-kernel - Re: [PATCH v5 2/7] phy: renesas: rcar-gen3-usb2: Fix an error handling path in rcar_gen3_phy_usb2

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Message-ID: <bc053bca-8dd9-4a50-a352-290b38a329b0@tuxon.dev>
Date: Tue, 19 Aug 2025 09:01:20 +0300
From: claudiu beznea <claudiu.beznea@...on.dev>
To: Biju Das <biju.das.jz@...renesas.com>, "vkoul@...nel.org"
 <vkoul@...nel.org>, "kishon@...nel.org" <kishon@...nel.org>,
 "robh@...nel.org" <robh@...nel.org>, "krzk+dt@...nel.org"
 <krzk+dt@...nel.org>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
 "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
 "geert+renesas@...der.be" <geert+renesas@...der.be>,
 "magnus.damm" <magnus.damm@...il.com>,
 Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Cc: "linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
 "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH v5 2/7] phy: renesas: rcar-gen3-usb2: Fix an error
 handling path in rcar_gen3_phy_usb2_probe()

Hi, Biju,

On 8/19/25 08:49, Biju Das wrote:
> Hi Claudiu, Christophe,
> 
> Thanks for the patch.
> 
>> -----Original Message-----
>> From: Claudiu <claudiu.beznea@...on.dev>
>> Sent: 19 August 2025 06:42
>> Subject: [PATCH v5 2/7] phy: renesas: rcar-gen3-usb2: Fix an error handling path in
>> rcar_gen3_phy_usb2_probe()
>>
>> From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
>>
>> If an error occurs after the reset_control_deassert(),
>> reset_control_assert() must be called, as already done in the remove function.
>>
>> Use devm_add_action_or_reset() to add the missing call and simplify the
>> .remove() function accordingly.
>>
>> Fixes: 4eae16375357 ("phy: renesas: rcar-gen3-usb2: Add support to initialize the bus")
>> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
>> Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
>> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
>> [claudiu.beznea: removed "struct reset_control *rstc = data;" from  rcar_gen3_reset_assert()]
>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>> ---
>>
>> Changes in v5:
>> - none
>>
>> Changes in v4:
>> - none
>>
>> Changes in v3:
>> - collected tags
>>
>> Changes in v2:
>> - none; this patch is new; re-spinned the Christophe's work at
>>
>> https://lore.kernel.org/all/TYCPR01MB113329930BA5E2149C9BE2A1986672@TYCPR01MB11332.jpnprd01.prod.outloo
>> k.com/
>>
>>
>>   drivers/phy/renesas/phy-rcar-gen3-usb2.c | 11 ++++++++++-
>>   1 file changed, 10 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/phy/renesas/phy-rcar-gen3-usb2.c b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
>> index 47beb94cd424..d61c171d454f 100644
>> --- a/drivers/phy/renesas/phy-rcar-gen3-usb2.c
>> +++ b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
>> @@ -699,6 +699,11 @@ static enum usb_dr_mode rcar_gen3_get_dr_mode(struct device_node *np)
>>   	return candidate;
>>   }
>>
>> +static void rcar_gen3_reset_assert(void *data) {
>> +	reset_control_assert(data);
>> +}
>> +
>>   static int rcar_gen3_phy_usb2_init_bus(struct rcar_gen3_chan *channel)  {
>>   	struct device *dev = channel->dev;
>> @@ -717,6 +722,11 @@ static int rcar_gen3_phy_usb2_init_bus(struct rcar_gen3_chan *channel)
>>   	if (ret)
>>   		goto rpm_put;
>>
>> +	ret = devm_add_action_or_reset(dev, rcar_gen3_reset_assert,
>> +				       channel->rstc);
> 
> Now 'rstc' can be removed from struct rcar_gen3_chan and use the local rstc pointer
> as context variable here.

I can drop it now but it will be added later (after this series) along with 
suspend to RAM support. That is the reason I preferred to still keep it.

Thank you,
Claudiu

> 
> Cheers,
> Biju
> 
>> +	if (ret)
>> +		goto rpm_put;
>> +
>>   	val = readl(channel->base + USB2_AHB_BUS_CTR);
>>   	val &= ~USB2_AHB_BUS_CTR_MBL_MASK;
>>   	val |= USB2_AHB_BUS_CTR_MBL_INCR4;
>> @@ -860,7 +870,6 @@ static void rcar_gen3_phy_usb2_remove(struct platform_device *pdev)
>>   	if (channel->is_otg_channel)
>>   		device_remove_file(&pdev->dev, &dev_attr_role);
>>
>> -	reset_control_assert(channel->rstc);
>>   	pm_runtime_disable(&pdev->dev);
>>   };
>>
>> --
>> 2.43.0
>