[PATCH v2 2/9] coresight-tpda: Add DSB dataset support

[Tao Zhang]

Hi Suzuki,

Currently if the dsb_esize is not set to 32 or 64, we will not set the 
DSBSIZE bit of the register here.

This design is really not good enough.

I will change this in the next version of patch to issue a warning if an 
unexpected value is obtained.

在 2/22/2023 8:46 PM, Suzuki K Poulose 写道:
> On 19/01/2023 07:41, Tao Zhang wrote:
>> Read the DSB element size from the device tree. Set the register
>> bit that controls the DSB element size of the corresponding port.
>>
>> Signed-off-by: Tao Zhang <quic_taozha at quicinc.com>
>> Signed-off-by: Tao Zhang <taozha at qti.qualcomm.com>
>> ---
>>   drivers/hwtracing/coresight/coresight-tpda.c | 62 
>> ++++++++++++++++++++++++++++
>>   drivers/hwtracing/coresight/coresight-tpda.h |  4 ++
>>   2 files changed, 66 insertions(+)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c 
>> b/drivers/hwtracing/coresight/coresight-tpda.c
>> index 5989798..be13e08 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpda.c
>> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
>> @@ -37,6 +37,15 @@ static void tpda_enable_port(struct tpda_drvdata 
>> *drvdata, int port)
>>       u32 val;
>>         val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
>> +    /*
>> +     * Configure aggregator port n DSB data set element size
>> +     * Set the bit to 0 if the size is 32
>> +     * Set the bit to 1 if the size is 64
>> +     */
>> +    if (drvdata->dsb_esize[port] == 32)
>> +        val &= ~TPDA_Pn_CR_DSBSIZE;
>> +    else if (drvdata->dsb_esize[port] == 64)
>> +        val |= TPDA_Pn_CR_DSBSIZE;
>
> What are the chances of having a value other than 32 or 64 ?
> What should we do in that case ? Should the driver at least
> give out a warning at least in the unhandled case rather than
> silently reusing the existing setting ?
>
> Suzuki
>
Best,

Tao