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

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Message-ID: <20200314095206.GR4885@vkoul-mobl>
Date:   Sat, 14 Mar 2020 15:22:06 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
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 13-03-20, 12:07, Pierre-Louis Bossart wrote:
> 
> 
> 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

Ok pls drop from here.

> > > +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.

That would be better. We use 0 for success everywhere and -ve error
codes.

-- 
~Vinod