Re: [PATCH 1/2] soundwire: bus: add CLOCK_STOP_MODE1 support back

[Richard Fitzgerald <rf@opensource.cirrus.com>]

On 29/06/2026 3:44 pm, Bard Liao wrote:
> CLOCK_STOP_MODE1 is used when the Peripheral might have entered a deeper
> power-saving mode that does not retain state while the Clock is stopped.
> It is useful when the device is more power consumption sensitive. Add it
> back to allow the Peripheral use CLOCK_STOP_MODE1.
> 
> Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
> Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>

<SNIP>

> +static enum sdw_clk_stop_mode sdw_get_clk_stop_mode(struct sdw_slave *slave)
> +{
> +	struct device *dev = &slave->dev;
> +	struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);

dev->driver will be NULL if a driver hasn't probed for this peripheral.
It should check slave->probed, like in sdw_slave_clk_stop_callback().

> +
> +	/*
> +	 * Query for clock stop mode if Slave implements
> +	 * ops->get_clk_stop_mode, else read from property.
> +	 */
> +	if (drv->ops && drv->ops->get_clk_stop_mode)
> +		return drv->ops->get_clk_stop_mode(slave);

It should be holding sdw_dev_lock when checking ops and calling
the callback .