[alsa-devel] [RFC PATCH] ASoC: omap-mcbsp: Add support for highter rate up to 384000

[Michael Trimarchi]

Hi

On 08/12/2013 05:36 PM, Peter Ujfalusi wrote:
> On 08/10/2013 10:53 AM, Michael Trimarchi wrote:
>> I found some time but I can't not test this patch now ;) too far from
>> my office. The idea is to check with MAX_BCLK. There are two points
>> that should cover slave and master mode. Is it the right direction?
>> BTW Do you think that is better to have at soc level as a new constraint?
> 
> I would not bother with the bclk check for now. We did not had issues so far
> and 48MHz is quite high anyways for our users so far.

Right now I'm working on 2 device that they need to support
384Khz 32bit stereo playback/recording and next dsd512, but we can skip this test.
Check is only for consistency anyway and it doesn't cost so much in time. I will prepare
a new patch and send without it.

Michael


> 
>>
>> Michael
>>
>> diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c
>> index 7483efb..ea95ad2 100644
>> --- a/sound/soc/omap/omap-mcbsp.c
>> +++ b/sound/soc/omap/omap-mcbsp.c
>> @@ -39,7 +39,9 @@
>>  #include "mcbsp.h"
>>  #include "omap-mcbsp.h"
>>  
>> -#define OMAP_MCBSP_RATES	(SNDRV_PCM_RATE_8000_96000)
>> +#define OMAP_MCBSP_MAX_BCLK	48000000
>> +#define OMAP_MCBSP_RATES	(SNDRV_PCM_RATE_8000_192000 |		\
>> +				 SNDRV_PCM_RATE_KNOT)
>>  
>>  #define OMAP_MCBSP_SOC_SINGLE_S16_EXT(xname, xmin, xmax, \
>>  	xhandler_get, xhandler_put) \
>> @@ -225,10 +227,14 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
>>  	struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);
>>  	struct omap_mcbsp_reg_cfg *regs = &mcbsp->cfg_regs;
>>  	struct snd_dmaengine_dai_dma_data *dma_data;
>> -	int wlen, channels, wpf;
>> +	int wlen, channels, wpf, bclk;
>>  	int pkt_size = 0;
>>  	unsigned int format, div, framesize, master;
>>  
>> +	bclk = snd_soc_params_to_bclk(params);
>> +	if (bclk < 0 || bclk > OMAP_MCBSP_MAX_BCLK)
>> +		return -EINVAL;
>> +
>>  	dma_data = snd_soc_dai_get_dma_data(cpu_dai, substream);
>>  	channels = params_channels(params);
>>  
>> @@ -326,7 +332,7 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
>>  	/* In McBSP master modes, FRAME (i.e. sample rate) is generated
>>  	 * by _counting_ BCLKs. Calculate frame size in BCLKs */
>>  	master = mcbsp->fmt & SND_SOC_DAIFMT_MASTER_MASK;
>> -	if (master ==	SND_SOC_DAIFMT_CBS_CFS) {
>> +	if (master == SND_SOC_DAIFMT_CBS_CFS) {
>>  		div = mcbsp->clk_div ? mcbsp->clk_div : 1;
>>  		framesize = (mcbsp->in_freq / div) / params_rate(params);
>>  
>> @@ -500,6 +506,9 @@ static int omap_mcbsp_dai_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
>>  			return -EBUSY;
>>  	}
>>  
>> +	if (freq > OMAP_MCBSP_MAX_BCLK)
>> +		return -EINVAL;
>> +
>>  	mcbsp->in_freq = freq;
>>  	regs->srgr2 &= ~CLKSM;
>>  	regs->pcr0 &= ~SCLKME;
>>>
>>>>
>>>> Michael
>>>>
>>>>>>  	},
>>>>>>  	.capture = {
>>>>>>  		.channels_min = 1,
>>>>>>  		.channels_max = 16,
>>>>>>  		.rates = OMAP_MCBSP_RATES,
>>>>>> +		.rate_min = 8000,
>>>>>> +		.rate_max = 384000,
>>>>>
>>>>> Same here, do not set these.
>>>>>
>>>>>>  		.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE,
>>>>>>  	},
>>>>>>  	.ops = &mcbsp_dai_ops,
>>>>>>
>>>>>
>>>>>
>>>>> -- 
>>>>> Péter
>>>>
>>>
>>>
>>> -- 
>>> Péter
> 
>