Re: [PATCH 05/16] soundwire: cadence: add clock_stop/restart routines

[Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>]

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;
		}