linux-kernel - Re: [PATCH v2 2/3] coresight: tpda: add logic to configure TPDA

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Message-ID: <2648f422-6bef-4336-bdda-2d1663bc2807@oss.qualcomm.com>
Date: Wed, 27 Aug 2025 17:52:09 +0800
From: Jie Gan <jie.gan@....qualcomm.com>
To: James Clark <james.clark@...aro.org>, Jie Gan <jie.gan@....qualcomm.com>
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach
 <mike.leach@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Tingwei Zhang <tingwei.zhang@....qualcomm.com>
Subject: Re: [PATCH v2 2/3] coresight: tpda: add logic to configure TPDA_SYNCR
 register



On 8/27/2025 5:21 PM, James Clark wrote:
> 
> 
> On 27/08/2025 5:20 am, Jie Gan wrote:
>> From: Tao Zhang <tao.zhang@....qualcomm.com>
>>
>> The TPDA_SYNCR register defines the frequency at which TPDA generates
>> ASYNC packets, enabling userspace tools to accurately parse each valid
>> packet.
>>
>> Signed-off-by: Tao Zhang <tao.zhang@....qualcomm.com>
>> Co-developed-by: Jie Gan <jie.gan@....qualcomm.com>
>> Signed-off-by: Jie Gan <jie.gan@....qualcomm.com>
>> ---
>>   drivers/hwtracing/coresight/coresight-tpda.c | 7 +++++++
>>   drivers/hwtracing/coresight/coresight-tpda.h | 6 ++++++
>>   2 files changed, 13 insertions(+)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/ 
>> hwtracing/coresight/coresight-tpda.c
>> index 647ab49a98d7..430f76c559f2 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpda.c
>> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
>> @@ -187,6 +187,13 @@ static void tpda_enable_pre_port(struct 
>> tpda_drvdata *drvdata)
>>        */
>>       if (drvdata->trig_flag_ts)
>>           writel_relaxed(0x0, drvdata->base + TPDA_FPID_CR);
>> +
>> +    /* Program the counter value for TPDA_SYNCR */
>> +    val = readl_relaxed(drvdata->base + TPDA_SYNCR);
>> +    /* Clear the mode */
>> +    val &= ~TPDA_SYNCR_MODE_CTRL;
>> +    val |= FIELD_PREP(TPDA_SYNCR_COUNTER_MASK, 
>> TPDA_SYNCR_MAX_COUNTER_VAL);
> 
> Just use the mask directly if you want to set all the bits. This makes 
> it seem like the MAX_COUNTER_VAL is something different.
> 

You are right. will fix it.

> val |= TPDA_SYNCR_COUNTER_MASK
> 
>> +    writel_relaxed(val, drvdata->base + TPDA_SYNCR);
>>   }
>>   static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.h b/drivers/ 
>> hwtracing/coresight/coresight-tpda.h
>> index 0be625fb52fd..8e1b66115ad1 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpda.h
>> +++ b/drivers/hwtracing/coresight/coresight-tpda.h
>> @@ -9,6 +9,7 @@
>>   #define TPDA_CR            (0x000)
>>   #define TPDA_Pn_CR(n)        (0x004 + (n * 4))
>>   #define TPDA_FPID_CR        (0x084)
>> +#define TPDA_SYNCR        (0x08C)
>>   /* Cross trigger FREQ packets timestamp bit */
>>   #define TPDA_CR_FREQTS        BIT(2)
>> @@ -27,6 +28,11 @@
>>   #define TPDA_Pn_CR_CMBSIZE        GENMASK(7, 6)
>>   /* Aggregator port DSB data set element size bit */
>>   #define TPDA_Pn_CR_DSBSIZE        BIT(8)
>> +/* TPDA_SYNCR mode control bit */
>> +#define TPDA_SYNCR_MODE_CTRL        BIT(12)
>> +/* TPDA_SYNCR counter mask */
>> +#define TPDA_SYNCR_COUNTER_MASK        GENMASK(11, 0)
>> +#define TPDA_SYNCR_MAX_COUNTER_VAL    (0xFFF)
> 
> No need to define a numeric value that's the same as the mask. It also 
> opens the possibility of making a mistake.
> 

will remove.

Thanks,
Jie

>>   #define TPDA_MAX_INPORTS    32
> 
>