From a4d11fe50c238a7da5225d1399314c3505cbd792 Mon Sep 17 00:00:00 2001 From: Timur Tabi Date: Wed, 25 Mar 2009 18:20:37 -0500 Subject: ASoC: remove trigger delay in Freescale MPC8610 sound driver Remove the delay from the trigger function in the Freescale MPC8610 sound driver when capture is started. This delay was used to ensure that the DMA controller was active when ALSA call the .pointer function to request a DMA transfer status. A better approach is for the .pointer function to detect that DMA has not started, and return zero instead. This change eliminates the need for the delay. Also add some related code to check for a DMA programming error, and report XRUN if it occurs. Signed-off-by: Timur Tabi Signed-off-by: Mark Brown --- sound/soc/fsl/fsl_dma.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'sound/soc/fsl/fsl_dma.c') diff --git a/sound/soc/fsl/fsl_dma.c b/sound/soc/fsl/fsl_dma.c index b3eb8570cd7b..2c4892c853cf 100644 --- a/sound/soc/fsl/fsl_dma.c +++ b/sound/soc/fsl/fsl_dma.c @@ -697,6 +697,23 @@ static snd_pcm_uframes_t fsl_dma_pointer(struct snd_pcm_substream *substream) else position = in_be32(&dma_channel->dar); + /* + * When capture is started, the SSI immediately starts to fill its FIFO. + * This means that the DMA controller is not started until the FIFO is + * full. However, ALSA calls this function before that happens, when + * MR.DAR is still zero. In this case, just return zero to indicate + * that nothing has been received yet. + */ + if (!position) + return 0; + + if ((position < dma_private->dma_buf_phys) || + (position > dma_private->dma_buf_end)) { + dev_err(substream->pcm->card->dev, + "dma pointer is out of range, halting stream\n"); + return SNDRV_PCM_POS_XRUN; + } + frames = bytes_to_frames(runtime, position - dma_private->dma_buf_phys); /* -- cgit v1.2.3-59-g8ed1b From 5c15a6869a75000fecea61e9985f4753311ec534 Mon Sep 17 00:00:00 2001 From: Anton Vorontsov Date: Sat, 4 Apr 2009 22:33:19 +0400 Subject: ASoC: fsl_dma: Pass the proper device for dma mapping routines The driver should pass a device that specifies internal DMA ops, but substream->pcm is just a logical device, and thus doesn't have arch- specific dma callbacks, therefore following bug appears: Freescale Synchronous Serial Interface (SSI) ASoC Driver ------------[ cut here ]------------ kernel BUG at arch/powerpc/include/asm/dma-mapping.h:237! Oops: Exception in kernel mode, sig: 5 [#1] ... NIP [c02259c4] snd_malloc_dev_pages+0x58/0xac LR [c0225c74] snd_dma_alloc_pages+0xf8/0x108 Call Trace: [df02bde0] [df02be2c] 0xdf02be2c (unreliable) [df02bdf0] [c0225c74] snd_dma_alloc_pages+0xf8/0x108 [df02be10] [c023a100] fsl_dma_new+0x68/0x124 [df02be20] [c02342ac] soc_new_pcm+0x1bc/0x234 [df02bea0] [c02343dc] snd_soc_new_pcms+0xb8/0x148 [df02bed0] [c023824c] cs4270_probe+0x34/0x124 [df02bef0] [c0232fe8] snd_soc_instantiate_card+0x1a4/0x2f4 [df02bf20] [c0233164] snd_soc_instantiate_cards+0x2c/0x68 [df02bf30] [c0234704] snd_soc_register_platform+0x60/0x80 [df02bf50] [c03d5664] fsl_soc_platform_init+0x18/0x28 ... This patch fixes the issue by using card's device instead. Signed-off-by: Anton Vorontsov Acked-by: Timur Tabi Signed-off-by: Mark Brown --- sound/soc/fsl/fsl_dma.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) (limited to 'sound/soc/fsl/fsl_dma.c') diff --git a/sound/soc/fsl/fsl_dma.c b/sound/soc/fsl/fsl_dma.c index 2c4892c853cf..b1a3a278819f 100644 --- a/sound/soc/fsl/fsl_dma.c +++ b/sound/soc/fsl/fsl_dma.c @@ -300,7 +300,7 @@ static int fsl_dma_new(struct snd_card *card, struct snd_soc_dai *dai, if (!card->dev->coherent_dma_mask) card->dev->coherent_dma_mask = fsl_dma_dmamask; - ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->dev, + ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev, fsl_dma_hardware.buffer_bytes_max, &pcm->streams[0].substream->dma_buffer); if (ret) { @@ -310,7 +310,7 @@ static int fsl_dma_new(struct snd_card *card, struct snd_soc_dai *dai, return -ENOMEM; } - ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->dev, + ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev, fsl_dma_hardware.buffer_bytes_max, &pcm->streams[1].substream->dma_buffer); if (ret) { @@ -418,7 +418,7 @@ static int fsl_dma_open(struct snd_pcm_substream *substream) return -EBUSY; } - dma_private = dma_alloc_coherent(substream->pcm->dev, + dma_private = dma_alloc_coherent(substream->pcm->card->dev, sizeof(struct fsl_dma_private), &ld_buf_phys, GFP_KERNEL); if (!dma_private) { dev_err(substream->pcm->card->dev, @@ -445,7 +445,7 @@ static int fsl_dma_open(struct snd_pcm_substream *substream) dev_err(substream->pcm->card->dev, "can't register ISR for IRQ %u (ret=%i)\n", dma_private->irq, ret); - dma_free_coherent(substream->pcm->dev, + dma_free_coherent(substream->pcm->card->dev, sizeof(struct fsl_dma_private), dma_private, dma_private->ld_buf_phys); return ret; @@ -778,13 +778,13 @@ static int fsl_dma_close(struct snd_pcm_substream *substream) free_irq(dma_private->irq, dma_private); if (dma_private->ld_buf_phys) { - dma_unmap_single(substream->pcm->dev, + dma_unmap_single(substream->pcm->card->dev, dma_private->ld_buf_phys, sizeof(dma_private->link), DMA_TO_DEVICE); } /* Deallocate the fsl_dma_private structure */ - dma_free_coherent(substream->pcm->dev, + dma_free_coherent(substream->pcm->card->dev, sizeof(struct fsl_dma_private), dma_private, dma_private->ld_buf_phys); substream->runtime->private_data = NULL; -- cgit v1.2.3-59-g8ed1b