openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

ASoC: davinci-mcasp: Get rid of bclk_lrclk_ratio in private data 

The slot_width is for essentially same thing. Instead of storing
bclk_lrclk_ratio, just store the slot_width. Comments has been updated
accordingly and some variable names changed to more descriptive.

Signed-off-by: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Jyri Sarha 2015-09-17 10:39:05 +03:00 committed by Mark Brown
parent dd55ff8346
commit 14a998be08
1 changed files with 31 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
sound/soc/davinci/davinci-mcasp.c
View File

@ -87,7 +87,6 @@ struct davinci_mcasp {
u8 *serial_dir;
u8 version;
u8 bclk_div;
u16 bclk_lrclk_ratio;
int streams;
u32 irq_request[2];
int dma_request[2];
@ -558,8 +557,21 @@ static int __davinci_mcasp_set_clkdiv(struct snd_soc_dai *dai, int div_id,
mcasp->bclk_div = div;
break;
case 2: /* BCLK/LRCLK ratio */
mcasp->bclk_lrclk_ratio = div;
case 2: /*
* BCLK/LRCLK ratio descries how many bit-clock cycles
* fit into one frame. The clock ratio is given for a
* full period of data (for I2S format both left and
* right channels), so it has to be divided by number
* of tdm-slots (for I2S - divided by 2).
* Instead of storing this ratio, we calculate a new
* tdm_slot width by dividing the the ratio by the
* number of configured tdm slots.
*/
mcasp->slot_width = div / mcasp->tdm_slots;
if (div % mcasp->tdm_slots)
dev_warn(mcasp->dev,
"%s(): BCLK/LRCLK %d is not divisible by %d tdm slots",
__func__, div, mcasp->tdm_slots);
break;
default:
@ -677,11 +689,13 @@ static int davinci_mcasp_set_tdm_slot(struct snd_soc_dai *dai,
}
static int davinci_config_channel_size(struct davinci_mcasp *mcasp,
int word_length)
int sample_width)
{
u32 fmt;
u32 tx_rotate = (word_length / 4) & 0x7;
u32 mask = (1ULL << word_length) - 1;
u32 tx_rotate = (sample_width / 4) & 0x7;
u32 mask = (1ULL << sample_width) - 1;
u32 slot_width = sample_width;
/*
* For captured data we should not rotate, inversion and masking is
* enoguh to get the data to the right position:
@ -694,31 +708,23 @@ static int davinci_config_channel_size(struct davinci_mcasp *mcasp,
u32 rx_rotate = 0;
/*
* if s BCLK-to-LRCLK ratio has been configured via the set_clkdiv()
* callback, take it into account here. That allows us to for example
* send 32 bits per channel to the codec, while only 16 of them carry
* audio payload.
* The clock ratio is given for a full period of data (for I2S format
* both left and right channels), so it has to be divided by number of
* tdm-slots (for I2S - divided by 2).
* Setting the tdm slot width either with set_clkdiv() or
* set_tdm_slot() allows us to for example send 32 bits per
* channel to the codec, while only 16 of them carry audio
* payload.
*/
if (mcasp->bclk_lrclk_ratio) {
u32 slot_length = mcasp->bclk_lrclk_ratio / mcasp->tdm_slots;
if (mcasp->slot_width) {
/*
* When we have more bclk then it is needed for the data, we
* need to use the rotation to move the received samples to have
* correct alignment.
* When we have more bclk then it is needed for the
* data, we need to use the rotation to move the
* received samples to have correct alignment.
*/
rx_rotate = (slot_length - word_length) / 4;
word_length = slot_length;
} else if (mcasp->slot_width) {
rx_rotate = (mcasp->slot_width - word_length) / 4;
word_length = mcasp->slot_width;
slot_width = mcasp->slot_width;
rx_rotate = (slot_width - sample_width) / 4;
}
/* mapping of the XSSZ bit-field as described in the datasheet */
fmt = (word_length >> 1) - 1;
fmt = (slot_width >> 1) - 1;
if (mcasp->op_mode != DAVINCI_MCASP_DIT_MODE) {
mcasp_mod_bits(mcasp, DAVINCI_MCASP_RXFMT_REG, RXSSZ(fmt),