[PATCH v5 3/4] phy: ti-pipe3: Fix EPROBE_DEFER handling for clock resources

[Hongling Zeng]

-- 
Sashiko AI review ·https://sashiko.dev/#/patchset/20260518062938.48114-1-zenghongling@kylinos.cn?part=3
--

   Hi,
   Resend to fix threading / delivery issues.
   Thank you for the review. You raise a valid point about using dev_err_probe()
   to avoid dmesg spam during probe deferral.

   I've kept dev_err() in this patch to maintain consistency with the existing
   code style and focus on the core EPROBE_DEFER fixes. However, I agree that
   dev_err_probe() would be better and can submit a follow-up cleanup patch to
   address the logging improvement.
    
   Does this approach work for you, or would you prefer I include the dev_err_probe()
   change in this series?

   Best regards,
   Hongling

在 2026年05月18日 16:09, Hongling Zeng 写道:
> -- 
> Sashiko AI review ·https://sashiko.dev/#/patchset/20260518062938.48114-1-zenghongling@kylinos.cn?part=3
>
> -- 
>    Hi,
>
>    Thank you for the review. You raise a valid point about using dev_err_probe()
>    to avoid dmesg spam during probe deferral.
>
>    I've kept dev_err() in this patch to maintain consistency with the existing
>    code style and focus on the core EPROBE_DEFER fixes. However, I agree that
>    dev_err_probe() would be better and can submit a follow-up cleanup patch to
>    address the logging improvement.
>     
>    Does this approach work for you, or would you prefer I include the dev_err_probe()
>    change in this series?
>
>    Best regards,
>    Hongling
>
>
> 在 2026年05月18日 14:29, Hongling Zeng 写道:
>> ti_pipe3_get_clk() has two issues with -EPROBE_DEFER error handling:
>>
>> 1. When devm_clk_get() for sysclk fails, the function returns -EINVAL
>>     instead of propagating the actual error code. This masks -EPROBE_DEFER
>>     to -EINVAL, breaking the probe deferral mechanism and causing permanent
>>     driver initialization failure on systems with non-deterministic probe
>>     ordering.
>>
>> 2. For SATA PHY refclk, the function ignores all errors to support older
>>     DTBs missing the refclk property. However, this incorrectly ignores
>>     -EPROBE_DEFER as well, causing the driver to proceed without waiting
>>     for the clock provider to become available.
>>
>> Fix both issues:
>> - Return PTR_ERR(phy->sys_clk) instead of -EINVAL to propagate all
>>    error codes including -EPROBE_DEFER
>> - Use devm_clk_get_optional() for SATA refclk to handle optional
>>    clocks while propagating -EPROBE_DEFER and other errors
>>
>> Fixes: a70143bbef6b ("drivers: phy: usb3/pipe3: Adapt pipe3 driver to Generic PHY Framework")
>> Fixes: 7f33912d2978 ("phy: ti-pipe3: Fix SATA across suspend/resume")
>> Signed-off-by: Hongling Zeng<zenghongling at kylinos.cn>
>>
>> ---
>>    Change in v4:
>>     - Merge refclk leak fix and EPROBE_DEFER fix into a single patch
>>     - Use devm_clk_get_optional() for SATA refclk
>>     - Drop manual -ENOENT handling
>>     - Ensure error paths are fully symmetric
>> ---
>>    Change in v5:
>>     -Add Fix ignored clock enable return value in init patch
>> ---
>>   drivers/phy/ti/phy-ti-pipe3.c | 20 +++++++++++++-------
>>   1 file changed, 13 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/phy/ti/phy-ti-pipe3.c b/drivers/phy/ti/phy-ti-pipe3.c
>> index 2d36fe4c4218..9ec228c2a940 100644
>> --- a/drivers/phy/ti/phy-ti-pipe3.c
>> +++ b/drivers/phy/ti/phy-ti-pipe3.c
>> @@ -608,14 +608,20 @@ static int ti_pipe3_get_clk(struct ti_pipe3 *phy)
>>   	struct clk *clk;
>>   	struct device *dev = phy->dev;
>>   
>> -	phy->refclk = devm_clk_get(dev, "refclk");
>> +	/*
>> +	 * refclk is optional for SATA PHY to support older DTBs, but
>> +	 * required for other modes. Use devm_clk_get_optional() for SATA
>> +	 * which returns NULL for -ENOENT, allowing us to propagate all
>> +	 * other errors including -EPROBE_DEFER.
>> +	 */
>> +	if (phy->mode == PIPE3_MODE_SATA)
>> +		phy->refclk = devm_clk_get_optional(dev, "refclk");
>> +	else
>> +		phy->refclk = devm_clk_get(dev, "refclk");
>> +
>>   	if (IS_ERR(phy->refclk)) {
>>   		dev_err(dev, "unable to get refclk\n");
>> -		/* older DTBs have missing refclk in SATA PHY
>> -		 * so don't bail out in case of SATA PHY.
>> -		 */
>> -		if (phy->mode != PIPE3_MODE_SATA)
>> -			return PTR_ERR(phy->refclk);
>> +		return PTR_ERR(phy->refclk);
>>   	}
>>   
>>   	if (phy->mode != PIPE3_MODE_SATA) {
>> @@ -632,7 +638,7 @@ static int ti_pipe3_get_clk(struct ti_pipe3 *phy)
>>   		phy->sys_clk = devm_clk_get(dev, "sysclk");
>>   		if (IS_ERR(phy->sys_clk)) {
>>   			dev_err(dev, "unable to get sysclk\n");
>> -			return -EINVAL;
>> +			return PTR_ERR(phy->sys_clk);
>>   		}
>>   	}
>>   
>