linux-kernel - Re: [alsa-devel] [RFC PATCH 21/40] soundwire: export helpers to find row and column values

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Date:   Fri, 26 Jul 2019 10:26:01 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Guennadi Liakhovetski <guennadi.liakhovetski@...ux.intel.com>
Cc:     alsa-devel@...a-project.org, tiwai@...e.de,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        vkoul@...nel.org, broonie@...nel.org,
        srinivas.kandagatla@...aro.org, jank@...ence.com,
        slawomir.blauciak@...el.com, Sanyog Kale <sanyog.r.kale@...el.com>
Subject: Re: [alsa-devel] [RFC PATCH 21/40] soundwire: export helpers to find
 row and column values



On 7/26/19 9:43 AM, Guennadi Liakhovetski wrote:
> On Thu, Jul 25, 2019 at 06:40:13PM -0500, Pierre-Louis Bossart wrote:
>> Add a prefix for common tables and export 2 helpers to set the frame
>> shapes based on row/col values.
>>
>> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
>> ---
>>   drivers/soundwire/bus.h    |  7 +++++--
>>   drivers/soundwire/stream.c | 14 ++++++++------
>>   2 files changed, 13 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/soundwire/bus.h b/drivers/soundwire/bus.h
>> index 06ac4adb0074..c57c9c23f6ca 100644
>> --- a/drivers/soundwire/bus.h
>> +++ b/drivers/soundwire/bus.h
>> @@ -73,8 +73,11 @@ struct sdw_msg {
>>   
>>   #define SDW_DOUBLE_RATE_FACTOR		2
>>   
>> -extern int rows[SDW_FRAME_ROWS];
>> -extern int cols[SDW_FRAME_COLS];
>> +extern int sdw_rows[SDW_FRAME_ROWS];
>> +extern int sdw_cols[SDW_FRAME_COLS];
> 
> So these arrays actually have to be exported? In the current (5.2) sources they
> seem to only be used in stream.c, maybe make them static there?
> 
>> +
>> +int sdw_find_row_index(int row);
>> +int sdw_find_col_index(int col);

yes, they need to be exported, they are used by the allocation algorithm 
(in Patch 27).
Others will need this for non-Intel solutions, it's really a part of the 
standard definition and should be shared.
I can improve the commit message to make this explicit.