move set dma data to startup callback function, if the set dma data exist in hw_params callback, so the dma data only usable when call hw_params, if want use it before hw_params callback, it will cause NULL pointer access oops

Signed-off-by: Bo Shen voice.shen@atmel.com --- Change in v2: - no change --- sound/soc/atmel/atmel_ssc_dai.c | 33 ++++++++++++++++----------------- 1 file changed, 16 insertions(+), 17 deletions(-)

diff --git a/sound/soc/atmel/atmel_ssc_dai.c b/sound/soc/atmel/atmel_ssc_dai.c index f3fdfa0..6cf9cf1 100644 --- a/sound/soc/atmel/atmel_ssc_dai.c +++ b/sound/soc/atmel/atmel_ssc_dai.c @@ -196,15 +196,27 @@ static int atmel_ssc_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct atmel_ssc_info *ssc_p = &ssc_info[dai->id]; - int dir_mask; + struct atmel_pcm_dma_params *dma_params; + int dir, dir_mask;

pr_debug("atmel_ssc_startup: SSC_SR=0x%u\n", ssc_readl(ssc_p->ssc->regs, SR));

- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + dir = 0; dir_mask = SSC_DIR_MASK_PLAYBACK; - else + } else { + dir = 1; dir_mask = SSC_DIR_MASK_CAPTURE; + } + + dma_params = &ssc_dma_params[dai->id][dir]; + dma_params->ssc = ssc_p->ssc; + dma_params->substream = substream; + + ssc_p->dma_params[dir] = dma_params; + + snd_soc_dai_set_dma_data(dai, substream, dma_params);

spin_lock_irq(&ssc_p->lock); if (ssc_p->dir_mask & dir_mask) { @@ -325,7 +337,6 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) { - struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream); int id = dai->id; struct atmel_ssc_info *ssc_p = &ssc_info[id]; struct atmel_pcm_dma_params *dma_params; @@ -344,19 +355,7 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream, else dir = 1;

- dma_params = &ssc_dma_params[id][dir]; - dma_params->ssc = ssc_p->ssc; - dma_params->substream = substream; - - ssc_p->dma_params[dir] = dma_params; - - /* - * The snd_soc_pcm_stream->dma_data field is only used to communicate - * the appropriate DMA parameters to the pcm driver hw_params() - * function. It should not be used for other purposes - * as it is common to all substreams. - */ - snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_params); + dma_params = ssc_p->dma_params[dir];

channels = params_channels(params);

as prepare callback for dma is acctually access ssc register which better done in dai driver, so move it to dai prepare callback function

Signed-off-by: Bo Shen voice.shen@atmel.com --- Change in v2: - split as a new patch --- sound/soc/atmel/atmel-pcm-dma.c | 14 -------------- sound/soc/atmel/atmel_ssc_dai.c | 1 + 2 files changed, 1 insertion(+), 14 deletions(-)

diff --git a/sound/soc/atmel/atmel-pcm-dma.c b/sound/soc/atmel/atmel-pcm-dma.c index 1d38fd0..5a57803 100644 --- a/sound/soc/atmel/atmel-pcm-dma.c +++ b/sound/soc/atmel/atmel-pcm-dma.c @@ -175,19 +175,6 @@ err: return ret; }

-static int atmel_pcm_dma_prepare(struct snd_pcm_substream *substream) -{ - struct snd_soc_pcm_runtime *rtd = substream->private_data; - struct atmel_pcm_dma_params *prtd; - - prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); - - ssc_writex(prtd->ssc->regs, SSC_IER, prtd->mask->ssc_error); - ssc_writex(prtd->ssc->regs, SSC_CR, prtd->mask->ssc_enable); - - return 0; -} - static int atmel_pcm_open(struct snd_pcm_substream *substream) { snd_soc_set_runtime_hwparams(substream, &atmel_pcm_dma_hardware); @@ -200,7 +187,6 @@ static struct snd_pcm_ops atmel_pcm_ops = { .close = snd_dmaengine_pcm_close_release_chan, .ioctl = snd_pcm_lib_ioctl, .hw_params = atmel_pcm_hw_params, - .prepare = atmel_pcm_dma_prepare, .trigger = snd_dmaengine_pcm_trigger, .pointer = snd_dmaengine_pcm_pointer_no_residue, .mmap = atmel_pcm_mmap, diff --git a/sound/soc/atmel/atmel_ssc_dai.c b/sound/soc/atmel/atmel_ssc_dai.c index 1ab4763..0ecf356 100644 --- a/sound/soc/atmel/atmel_ssc_dai.c +++ b/sound/soc/atmel/atmel_ssc_dai.c @@ -649,6 +649,7 @@ static int atmel_ssc_prepare(struct snd_pcm_substream *substream, dma_params = ssc_p->dma_params[dir];

ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_enable); + ssc_writel(ssc_p->ssc->regs, IER, dma_params->mask->ssc_error);

pr_debug("%s enabled SSC_SR=0x%08x\n", dir ? "receive" : "transmit",

Align atmel pcm to use ASoC generic dmaengine framework

DMA is fully device tree based

Signed-off-by: Bo Shen voice.shen@atmel.com --- Change in v2: - slipt the prepare function as a seperate patch - remove phybase convert as the type change to dma_addr_t --- sound/soc/atmel/Kconfig | 1 + sound/soc/atmel/atmel-pcm-dma.c | 104 ++++++--------------------------------- 2 files changed, 17 insertions(+), 88 deletions(-)

diff --git a/sound/soc/atmel/Kconfig b/sound/soc/atmel/Kconfig index 022853f..0cdb097 100644 --- a/sound/soc/atmel/Kconfig +++ b/sound/soc/atmel/Kconfig @@ -13,6 +13,7 @@ config SND_ATMEL_SOC_PDC config SND_ATMEL_SOC_DMA tristate depends on SND_ATMEL_SOC + select SND_SOC_GENERIC_DMAENGINE_PCM

config SND_ATMEL_SOC_SSC tristate diff --git a/sound/soc/atmel/atmel-pcm-dma.c b/sound/soc/atmel/atmel-pcm-dma.c index 5a57803..3ff5601 100644 --- a/sound/soc/atmel/atmel-pcm-dma.c +++ b/sound/soc/atmel/atmel-pcm-dma.c @@ -89,124 +89,52 @@ static void atmel_pcm_dma_irq(u32 ssc_sr, } }

-/*--------------------------------------------------------------------------*\ - * DMAENGINE operations -*--------------------------------------------------------------------------*/ -static bool filter(struct dma_chan *chan, void *slave) -{ - struct at_dma_slave *sl = slave; - - if (sl->dma_dev == chan->device->dev) { - chan->private = sl; - return true; - } else { - return false; - } -} - static int atmel_pcm_configure_dma(struct snd_pcm_substream *substream, - struct snd_pcm_hw_params *params, struct atmel_pcm_dma_params *prtd) + struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config) { + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct atmel_pcm_dma_params *prtd; struct ssc_device *ssc; - struct dma_chan *dma_chan; - struct dma_slave_config slave_config; int ret;

+ prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); ssc = prtd->ssc;

- ret = snd_hwparams_to_dma_slave_config(substream, params, - &slave_config); + ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config); if (ret) { pr_err("atmel-pcm: hwparams to dma slave configure failed\n"); return ret; }

if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { - slave_config.dst_addr = (dma_addr_t)ssc->phybase + SSC_THR; - slave_config.dst_maxburst = 1; + slave_config->dst_addr = ssc->phybase + SSC_THR; + slave_config->dst_maxburst = 1; } else { - slave_config.src_addr = (dma_addr_t)ssc->phybase + SSC_RHR; - slave_config.src_maxburst = 1; - } - - dma_chan = snd_dmaengine_pcm_get_chan(substream); - if (dmaengine_slave_config(dma_chan, &slave_config)) { - pr_err("atmel-pcm: failed to configure dma channel\n"); - ret = -EBUSY; - return ret; - } - - return 0; -} - -static int atmel_pcm_hw_params(struct snd_pcm_substream *substream, - struct snd_pcm_hw_params *params) -{ - struct snd_soc_pcm_runtime *rtd = substream->private_data; - struct atmel_pcm_dma_params *prtd; - struct ssc_device *ssc; - struct at_dma_slave *sdata = NULL; - int ret; - - snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); - - prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); - ssc = prtd->ssc; - if (ssc->pdev) - sdata = ssc->pdev->dev.platform_data; - - ret = snd_dmaengine_pcm_open_request_chan(substream, filter, sdata); - if (ret) { - pr_err("atmel-pcm: dmaengine pcm open failed\n"); - return -EINVAL; - } - - ret = atmel_pcm_configure_dma(substream, params, prtd); - if (ret) { - pr_err("atmel-pcm: failed to configure dmai\n"); - goto err; + slave_config->src_addr = ssc->phybase + SSC_RHR; + slave_config->src_maxburst = 1; }

prtd->dma_intr_handler = atmel_pcm_dma_irq;

return 0; -err: - snd_dmaengine_pcm_close_release_chan(substream); - return ret; -} - -static int atmel_pcm_open(struct snd_pcm_substream *substream) -{ - snd_soc_set_runtime_hwparams(substream, &atmel_pcm_dma_hardware); - - return 0; }

-static struct snd_pcm_ops atmel_pcm_ops = { - .open = atmel_pcm_open, - .close = snd_dmaengine_pcm_close_release_chan, - .ioctl = snd_pcm_lib_ioctl, - .hw_params = atmel_pcm_hw_params, - .trigger = snd_dmaengine_pcm_trigger, - .pointer = snd_dmaengine_pcm_pointer_no_residue, - .mmap = atmel_pcm_mmap, -}; - -static struct snd_soc_platform_driver atmel_soc_platform = { - .ops = &atmel_pcm_ops, - .pcm_new = atmel_pcm_new, - .pcm_free = atmel_pcm_free, +static const struct snd_dmaengine_pcm_config atmel_dmaengine_pcm_config = { + .prepare_slave_config = atmel_pcm_configure_dma, + .pcm_hardware = &atmel_pcm_dma_hardware, + .prealloc_buffer_size = ATMEL_SSC_DMABUF_SIZE, };

int atmel_pcm_dma_platform_register(struct device *dev) { - return snd_soc_register_platform(dev, &atmel_soc_platform); + return snd_dmaengine_pcm_register(dev, &atmel_dmaengine_pcm_config, + SND_DMAENGINE_PCM_FLAG_NO_RESIDUE); } EXPORT_SYMBOL(atmel_pcm_dma_platform_register);

void atmel_pcm_dma_platform_unregister(struct device *dev) { - snd_soc_unregister_platform(dev); + snd_dmaengine_pcm_unregister(dev); } EXPORT_SYMBOL(atmel_pcm_dma_platform_unregister);