Re: [PATCH RESEND] soundwire: stream: Revert "soundwire: stream: fix programming slave ports for non-continous port maps"

["Péter Ujfalusi" <peter.ujfalusi@linux.intel.com>]

On 09/09/2024 19:47, Krzysztof Kozlowski wrote:
> This reverts commit ab8d66d132bc8f1992d3eb6cab8d32dda6733c84 because it
> breaks codecs using non-continuous masks in source and sink ports.  The
> commit missed the point that port numbers are not used as indices for
> iterating over prop.sink_ports or prop.source_ports.
> 
> Soundwire core and existing codecs expect that the array passed as
> prop.sink_ports and prop.source_ports is continuous.  The port mask still
> might be non-continuous, but that's unrelated.
> 
> Reported-by: Bard Liao <yung-chuan.liao@linux.intel.com>
> Closes: https://lore.kernel.org/all/b6c75eee-761d-44c8-8413-2a5b34ee2f98@linux.intel.com/
> Fixes: ab8d66d132bc ("soundwire: stream: fix programming slave ports for non-continous port maps")
> Acked-by: Bard Liao <yung-chuan.liao@linux.intel.com>
> Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
> Cc: <stable@vger.kernel.org>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Tested-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>

> 
> ---
> 
> Resending with Ack/Rb tags and missing Cc-stable.
> ---
>  drivers/soundwire/stream.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
> index f275143d7b18..7aa4900dcf31 100644
> --- a/drivers/soundwire/stream.c
> +++ b/drivers/soundwire/stream.c
> @@ -1291,18 +1291,18 @@ struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
>  					    unsigned int port_num)
>  {
>  	struct sdw_dpn_prop *dpn_prop;
> -	unsigned long mask;
> +	u8 num_ports;
>  	int i;
>  
>  	if (direction == SDW_DATA_DIR_TX) {
> -		mask = slave->prop.source_ports;
> +		num_ports = hweight32(slave->prop.source_ports);
>  		dpn_prop = slave->prop.src_dpn_prop;
>  	} else {
> -		mask = slave->prop.sink_ports;
> +		num_ports = hweight32(slave->prop.sink_ports);
>  		dpn_prop = slave->prop.sink_dpn_prop;
>  	}
>  
> -	for_each_set_bit(i, &mask, 32) {
> +	for (i = 0; i < num_ports; i++) {
>  		if (dpn_prop[i].num == port_num)
>  			return &dpn_prop[i];
>  	}

-- 
Péter