Re: [PATCH v1 01/12] soc: qcom: geni-se: Refactor geni_icc_get() and make qup-memory ICC path optional

[Praveen Talari <praveen.talari@oss.qualcomm.com>]

Hi Bjorn,

Thank you for review

On 11/26/2025 8:37 PM, Bjorn Andersson wrote:
> On Sat, Nov 22, 2025 at 10:30:07AM +0530, Praveen Talari wrote:
>> Refactor the geni_icc_get() function to replace the loop-based ICC path
>> initialization with explicit handling of each interconnect path. This
>> improves code readability and allows for different error handling per
>> path type.
> 
> I don't think this "improves code readability", IMO you're turning a
> clean loop into a unrolled mess.
> 
> 
> But then comes the least significant portion of your "problem
> description" (i.e. the last words of it), where you indicate that this
> would allow you to have different error handling for "qup-memory".
> 
> This is actually a valid reason to make this change, so say that!
> 
> 
>>
>> The "qup-core" and "qup-config" paths remain mandatory, while "qup-memory"
>> is now optional and skipped if not defined in DT.
>>
> 
> Please rewrite this message to _start_ with the problem description.
> Make it clear on the first line/sentence why the change should be done.
> 
> E.g. compare with something like this:
> 
> """
> "qup-memory" is an optional interconnect path, unroll the geni_icc_get()
> loop in order to allow specific error handling for this path.
> """
> 
> You only need to read 4 words to understand exactly why this patch
> exists.

The "qup-memory" interconnect path is optional and may not be defined
in all device trees. Unroll the loop-based ICC path initialization to
allow specific error handling for each path type.

The "qup-core" and "qup-config" paths remain mandatory and will fail
probe if missing, while "qup-memory" is now handled as optional and
skipped when not present in the device tree.

I hope the commit text above should be appropriate

Thanks,
Praveen
> 
>> Co-developed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
>> Signed-off-by: Praveen Talari <praveen.talari@oss.qualcomm.com>
>> ---
>>   drivers/soc/qcom/qcom-geni-se.c | 36 +++++++++++++++++----------------
>>   1 file changed, 19 insertions(+), 17 deletions(-)
>>
>> diff --git a/drivers/soc/qcom/qcom-geni-se.c b/drivers/soc/qcom/qcom-geni-se.c
>> index cd1779b6a91a..b6167b968ef6 100644
>> --- a/drivers/soc/qcom/qcom-geni-se.c
>> +++ b/drivers/soc/qcom/qcom-geni-se.c
>> @@ -899,30 +899,32 @@ EXPORT_SYMBOL_GPL(geni_se_rx_dma_unprep);
>>   
>>   int geni_icc_get(struct geni_se *se, const char *icc_ddr)
>>   {
>> -	int i, err;
>> -	const char *icc_names[] = {"qup-core", "qup-config", icc_ddr};
>> +	struct geni_icc_path *icc_paths = se->icc_paths;
>>   
>>   	if (has_acpi_companion(se->dev))
>>   		return 0;
>>   
>> -	for (i = 0; i < ARRAY_SIZE(se->icc_paths); i++) {
>> -		if (!icc_names[i])
>> -			continue;
>> -
>> -		se->icc_paths[i].path = devm_of_icc_get(se->dev, icc_names[i]);
>> -		if (IS_ERR(se->icc_paths[i].path))
>> -			goto err;
>> +	icc_paths[GENI_TO_CORE].path = devm_of_icc_get(se->dev, "qup-core");
>> +	if (IS_ERR(icc_paths[GENI_TO_CORE].path))
>> +		return dev_err_probe(se->dev, PTR_ERR(icc_paths[GENI_TO_CORE].path),
>> +				     "Failed to get 'qup-core' ICC path\n");
> 
> To taste, but I think a local variable would be helpful to make this
> less dense.

Sure, will do it in next version.

Thanks,
Praveen
> 
> 	path = devm_of_icc_get(se->dev, "qup-core");
> 	if (IS_ERR(path))
> 		return dev_err_probe(se->dev, PTR_ERR(path), "Failed to get 'qup-core' ICC path\n");
> 	icc_paths[GENI_TO_CORE].path = path;
> 
> Regards,
> Bjorn
> 
>> +
>> +	icc_paths[CPU_TO_GENI].path = devm_of_icc_get(se->dev, "qup-config");
>> +	if (IS_ERR(icc_paths[CPU_TO_GENI].path))
>> +		return dev_err_probe(se->dev, PTR_ERR(icc_paths[CPU_TO_GENI].path),
>> +				     "Failed to get 'qup-config' ICC path\n");
>> +
>> +	/* The DDR path is optional, depending on protocol and hw capabilities */
>> +	icc_paths[GENI_TO_DDR].path = devm_of_icc_get(se->dev, "qup-memory");
>> +	if (IS_ERR(icc_paths[GENI_TO_DDR].path)) {
>> +		if (PTR_ERR(icc_paths[GENI_TO_DDR].path) == -ENODATA)
>> +			icc_paths[GENI_TO_DDR].path = NULL;
>> +		else
>> +			return dev_err_probe(se->dev, PTR_ERR(icc_paths[GENI_TO_DDR].path),
>> +					     "Failed to get 'qup-memory' ICC path\n");
>>   	}
>>   
>>   	return 0;
>> -
>> -err:
>> -	err = PTR_ERR(se->icc_paths[i].path);
>> -	if (err != -EPROBE_DEFER)
>> -		dev_err_ratelimited(se->dev, "Failed to get ICC path '%s': %d\n",
>> -					icc_names[i], err);
>> -	return err;
>> -
>>   }
>>   EXPORT_SYMBOL_GPL(geni_icc_get);
>>   
>> -- 
>> 2.34.1
>>