Commit 1bdd7419 authored by Janusz Krzysztofik's avatar Janusz Krzysztofik Committed by Mark Brown

ASoC: OMAP: fix OMAP1510 broken PCM pointer callback

This patch tries to work around the problem of broken OMAP1510 PCM playback
pointer calculation by replacing DMA function call that incorrectly tries to
read the value form DMA hardware with a value computed locally from an
already maintained variable omap_runtime_data.period_index.

Tested on OMAP5910 based Amstrad Delta (E3) using work in progress ASoC
driver.

Based on linux-2.6-asoc.git v2.6.31-rc1.
Signed-off-by: default avatarJanusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Acked-by: default avatarJarkko Nikula <jhnikula@gmail.com>
Acked-by: default avatarPeter Ujfalusi <peter.ujfalusi@nokia.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 40d9ec14
...@@ -216,12 +216,15 @@ static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream) ...@@ -216,12 +216,15 @@ static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
dma_addr_t ptr; dma_addr_t ptr;
snd_pcm_uframes_t offset; snd_pcm_uframes_t offset;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
ptr = omap_get_dma_src_pos(prtd->dma_ch);
else
ptr = omap_get_dma_dst_pos(prtd->dma_ch); ptr = omap_get_dma_dst_pos(prtd->dma_ch);
offset = bytes_to_frames(runtime, ptr - runtime->dma_addr); offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
} else if (!(cpu_is_omap1510())) {
ptr = omap_get_dma_src_pos(prtd->dma_ch);
offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
} else
offset = prtd->period_index * runtime->period_size;
if (offset >= runtime->buffer_size) if (offset >= runtime->buffer_size)
offset = 0; offset = 0;
......
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