linux-kernel - Re: [PATCH] soundwire: qcom: add debugfs entry for soundwire register dump

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Date:   Fri, 8 Oct 2021 11:54:01 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     yung-chuan.liao@...ux.intel.com,
        pierre-louis.bossart@...ux.intel.com, sanyog.r.kale@...el.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] soundwire: qcom: add debugfs entry for soundwire register
 dump



On 01/10/2021 05:20, Vinod Koul wrote:
> HI Srini,
> 
> On 07-09-21, 11:56, Srinivas Kandagatla wrote:
>> +#ifdef CONFIG_DEBUG_FS
>> +static int swrm_reg_show(struct seq_file *s_file, void *data)
>> +{
>> +	struct qcom_swrm_ctrl *swrm = s_file->private;
>> +	int reg, reg_val;
>> +
>> +	for (reg = 0; reg <= SWR_MSTR_MAX_REG_ADDR; reg += 4) {
>> +		swrm->reg_read(swrm, reg, &reg_val);
> 
> Why not use regmap_read here, that would avoid reading from the bus when
> we already have the values...

Sorry for such late reply.
But these are controller registers which are not exposed as regmaps in 
mmio cases.


> 
> Second make sure later when pm_runtime support is added, this take a
> reference ..
> 
Yes, Am currently working on runtime pm support, I will make sure that 
this is take care.

--srini
> Thanks
>