linux-kernel - Re: [alsa-devel] [PATCH] soundwire: intel: fix PDI/stream mapping for Bulk

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Date:   Thu, 24 Oct 2019 07:37:13 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     alsa-devel@...a-project.org, tiwai@...e.de,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        broonie@...nel.org, srinivas.kandagatla@...aro.org,
        jank@...ence.com, slawomir.blauciak@...el.com,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        Bard liao <yung-chuan.liao@...ux.intel.com>,
        Rander Wang <rander.wang@...ux.intel.com>
Subject: Re: [alsa-devel] [PATCH] soundwire: intel: fix PDI/stream mapping for
 Bulk

On 10/24/19 6:23 AM, Vinod Koul wrote:
> On 22-10-19, 18:29, Pierre-Louis Bossart wrote:
>> The previous formula is incorrect for PDI0/1, the mapping is not
>> linear but has a discontinuity between PDI1 and PDI2.
>>
>> This change has no effect on PCM PDIs (same mapping).
>>
>> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
>> ---
>>   drivers/soundwire/intel.c | 10 ++++++++--
>>   1 file changed, 8 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
>> index b403ccc832b6..c984261fcc33 100644
>> --- a/drivers/soundwire/intel.c
>> +++ b/drivers/soundwire/intel.c
>> @@ -480,7 +480,10 @@ intel_pdi_shim_configure(struct sdw_intel *sdw, struct sdw_cdns_pdi *pdi)
>>   	unsigned int link_id = sdw->instance;
>>   	int pdi_conf = 0;
>>   
>> -	pdi->intel_alh_id = (link_id * 16) + pdi->num + 5;
>> +	/* the Bulk and PCM streams are not contiguous */
>> +	pdi->intel_alh_id = (link_id * 16) + pdi->num + 3;
>> +	if (pdi->num >= 2)
>> +		pdi->intel_alh_id += 2;
>>   
>>   	/*
>>   	 * Program stream parameters to stream SHIM register
>> @@ -509,7 +512,10 @@ intel_pdi_alh_configure(struct sdw_intel *sdw, struct sdw_cdns_pdi *pdi)
>>   	unsigned int link_id = sdw->instance;
>>   	unsigned int conf;
>>   
>> -	pdi->intel_alh_id = (link_id * 16) + pdi->num + 5;
>> +	/* the Bulk and PCM streams are not contiguous */
>> +	pdi->intel_alh_id = (link_id * 16) + pdi->num + 3;
>> +	if (pdi->num >= 2)
>> +		pdi->intel_alh_id += 2;
> 
> The change is repeated so how about:
> 
>          intel_pdi_update_alh() or similar which does this rather than
> repeat the pattern

The initial code was also repeated by the initial contributors, this 
patch does not refactor the code but corrects an invalid mapping. We 
will do this refactoring at a later point, when we add the clock-stop mode.

> 
>>   
>>   	/* Program Stream config ALH register */
>>   	conf = intel_readl(alh, SDW_ALH_STRMZCFG(pdi->intel_alh_id));
>> -- 
>> 2.20.1
>