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

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Message-ID: <a7a4bb04-de90-4637-b9e4-81c3138347d3@linux.intel.com>
Date: Tue, 10 Sep 2024 16:49:55 +0300
From: Péter Ujfalusi <peter.ujfalusi@...ux.intel.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 Vinod Koul <vkoul@...nel.org>, Bard Liao <yung-chuan.liao@...ux.intel.com>,
 Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
 Sanyog Kale <sanyog.r.kale@...el.com>, alsa-devel@...a-project.org,
 linux-kernel@...r.kernel.org
Cc: Charles Keepax <ckeepax@...nsource.cirrus.com>, stable@...r.kernel.org
Subject: Re: [PATCH RESEND] soundwire: stream: Revert "soundwire: stream: fix
 programming slave ports for non-continous port maps"



On 10/09/2024 16:05, Péter Ujfalusi wrote:
> 
> 
> 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@...ux.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@...ux.intel.com>
>> Reviewed-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
>> Cc: <stable@...r.kernel.org>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 
> Tested-by: Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>

Vinod: can you pick this patch for 6.11 if there is still time since
upstream is also broken since 6.11-rc6


> 
>>
>> ---
>>
>> 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