linux-kernel - Re: [PATCH 05/16] soundwire: cadence: add clock

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Date:   Fri, 13 Mar 2020 12:07:59 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     alsa-devel@...a-project.org, tiwai@...e.de,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Hui Wang <hui.wang@...onical.com>, broonie@...nel.org,
        srinivas.kandagatla@...aro.org, jank@...ence.com,
        slawomir.blauciak@...el.com, Sanyog Kale <sanyog.r.kale@...el.com>,
        Rander Wang <rander.wang@...el.com>,
        Bard liao <yung-chuan.liao@...ux.intel.com>,
        Rander Wang <rander.wang@...ux.intel.com>
Subject: Re: [PATCH 05/16] soundwire: cadence: add clock_stop/restart routines



On 3/13/20 7:21 AM, Vinod Koul wrote:
> On 11-03-20, 13:41, Pierre-Louis Bossart wrote:
> 
>> @@ -225,12 +225,30 @@ static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value)
>>   			return 0;
>>   
>>   		timeout--;
>> -		udelay(50);
>> +		usleep_range(50, 100);
> 
> this seems okay change, but unrelated to this patch

ok. It doesn't really matter anyway, this function is removed in Patch 8

>> +int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)
>> +{
>> +	bool slave_present = false;
>> +	struct sdw_slave *slave;
>> +	u32 status;
>> +	int ret;
>> +
>> +	/* Check suspend status */
>> +	status = cdns_readl(cdns, CDNS_MCP_STAT);
>> +	if (status & CDNS_MCP_STAT_CLK_STOP) {
>> +		dev_dbg(cdns->dev, "Clock is already stopped\n");
>> +		return 1;
> 
> return of 1..? Does that indicate success/fail..?

success. I guess it could be moved as 0.

		ret = sdw_cdns_clock_stop(cdns, true);
		if (ret < 0) {
			dev_err(dev, "cannot enable clock stop on suspend\n");
			return ret;
		}