linux-kernel - Re: [RFC PATCH 07/40] soundwire: intel: fix channel number reported by hardware

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Date:   Fri, 2 Aug 2019 10:18:02 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        tiwai@...e.de, broonie@...nel.org, gregkh@...uxfoundation.org,
        jank@...ence.com, srinivas.kandagatla@...aro.org,
        slawomir.blauciak@...el.com, Sanyog Kale <sanyog.r.kale@...el.com>
Subject: Re: [RFC PATCH 07/40] soundwire: intel: fix channel number reported
 by hardware



On 8/2/19 6:57 AM, Vinod Koul wrote:
> On 25-07-19, 18:39, Pierre-Louis Bossart wrote:
>> PDI2 reports an invalid count, force the correct hardware-supported
>> value
>>
>> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
>> ---
>>   drivers/soundwire/intel.c | 9 +++++++++
>>   1 file changed, 9 insertions(+)
>>
>> diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
>> index 497879dd9c0d..51990b192dc0 100644
>> --- a/drivers/soundwire/intel.c
>> +++ b/drivers/soundwire/intel.c
>> @@ -401,6 +401,15 @@ intel_pdi_get_ch_cap(struct sdw_intel *sdw, unsigned int pdi_num, bool pcm)
>>   
>>   	if (pcm) {
>>   		count = intel_readw(shim, SDW_SHIM_PCMSYCHC(link_id, pdi_num));
>> +
>> +		/*
>> +		 * TODO: pdi number 2 reports channel count as 1 even though
>> +		 * it supports 8 channel. Performing hardcoding for pdi
>> +		 * number 2.
>> +		 */
>> +		if (pdi_num == 2)
>> +			count = 7;
> 
> Is that true for all Intel controllers or some generations. Would it not
> be better to put this under some flag which is set on platform basis?

This is true of all controllers released so far.
We will change this if the hardware changes.

> 
>> +
>>   	} else {
>>   		count = intel_readw(shim, SDW_SHIM_PDMSCAP(link_id));
>>   		count = ((count & SDW_SHIM_PDMSCAP_CPSS) >>
>> -- 
>> 2.20.1
>