diff options
| author | Lee Jones <lee.jones@linaro.org> | 2013-05-15 09:51:57 (GMT) |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2013-06-04 09:12:09 (GMT) |
| commit | 43f2e1a3be5d83004f09bcb53c46f273e7473a00 (patch) | |
| tree | af13dad918da322ee4984925453dbe157731d790 /sound | |
| parent | 16db3411ebd4777b0b1b7207b10730b726fb751c (diff) | |
| download | linux-43f2e1a3be5d83004f09bcb53c46f273e7473a00.tar.xz | |
dmaengine: ste_dma40: Convert data_width from register bit format to value
When a DMA client requests and configures a DMA channel, it requests
data_width in Bytes. The DMA40 driver then swiftly converts it over to
the necessary register bit value. Unfortunately, for any subsequent
calculations we have to shift '1' by the bit pattern (1 << data_width)
times to make any sense of it.
This patch flips the semantics on its head and only converts the value
to its respective register bit pattern when writing to registers. This
way we can use the true data_width (in Bytes) value.
Cc: Dan Williams <djbw@fb.com>
Cc: Per Forlin <per.forlin@stericsson.com>
Cc: Rabin Vincent <rabin@rab.in>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/soc/ux500/ux500_pcm.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/sound/soc/ux500/ux500_pcm.c b/sound/soc/ux500/ux500_pcm.c index b6e5ae2..31f9bbc 100644 --- a/sound/soc/ux500/ux500_pcm.c +++ b/sound/soc/ux500/ux500_pcm.c @@ -76,20 +76,20 @@ static struct dma_chan *ux500_pcm_request_chan(struct snd_soc_pcm_runtime *rtd, dma_params = snd_soc_dai_get_dma_data(dai, substream); dma_cfg = dma_params->dma_cfg; - mem_data_width = STEDMA40_HALFWORD_WIDTH; + mem_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES; switch (dma_params->data_size) { case 32: - per_data_width = STEDMA40_WORD_WIDTH; + per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES; break; case 16: - per_data_width = STEDMA40_HALFWORD_WIDTH; + per_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES; break; case 8: - per_data_width = STEDMA40_BYTE_WIDTH; + per_data_width = DMA_SLAVE_BUSWIDTH_1_BYTE; break; default: - per_data_width = STEDMA40_WORD_WIDTH; + per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES; } if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |