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authorShengjiu Wang <shengjiu.wang@nxp.com>2019-09-27 04:46:11 +0300
committerMark Brown <broonie@kernel.org>2019-10-01 14:18:25 +0300
commite957204e732bc2916a241dc61dd7dd14e9a98350 (patch)
tree41d1daf1182778a9d3cc23522c264af3e240996b /sound/core
parent109539c986cee525e5ff9ae98793f23c2b29e54d (diff)
downloadlinux-e957204e732bc2916a241dc61dd7dd14e9a98350.tar.xz
ASoC: pcm_dmaengine: Extract snd_dmaengine_pcm_refine_runtime_hwparams
When set the runtime hardware parameters, we may need to query the capability of DMA to complete the parameters. This patch is to Extract this operation from dmaengine_pcm_set_runtime_hwparams function to a separate function snd_dmaengine_pcm_refine_runtime_hwparams, that other components which need this feature can call this function. Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com> Reviewed-by: Nicolin Chen <nicoleotsuka@gmail.com> Link: https://lore.kernel.org/r/d728f65194e9978cbec4132b522d4fed420d704a.1569493933.git.shengjiu.wang@nxp.com Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/core')
-rw-r--r--sound/core/pcm_dmaengine.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/sound/core/pcm_dmaengine.c b/sound/core/pcm_dmaengine.c
index 89a05926ac73..5749a8a49784 100644
--- a/sound/core/pcm_dmaengine.c
+++ b/sound/core/pcm_dmaengine.c
@@ -369,4 +369,87 @@ int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream)
}
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close_release_chan);
+/**
+ * snd_dmaengine_pcm_refine_runtime_hwparams - Refine runtime hw params
+ * @substream: PCM substream
+ * @dma_data: DAI DMA data
+ * @hw: PCM hw params
+ * @chan: DMA channel to use for data transfers
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ *
+ * This function will query DMA capability, then refine the pcm hardware
+ * parameters.
+ */
+int snd_dmaengine_pcm_refine_runtime_hwparams(
+ struct snd_pcm_substream *substream,
+ struct snd_dmaengine_dai_dma_data *dma_data,
+ struct snd_pcm_hardware *hw,
+ struct dma_chan *chan)
+{
+ struct dma_slave_caps dma_caps;
+ u32 addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
+ BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
+ BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+ snd_pcm_format_t i;
+ int ret = 0;
+
+ if (!hw || !chan || !dma_data)
+ return -EINVAL;
+
+ ret = dma_get_slave_caps(chan, &dma_caps);
+ if (ret == 0) {
+ if (dma_caps.cmd_pause && dma_caps.cmd_resume)
+ hw->info |= SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME;
+ if (dma_caps.residue_granularity <= DMA_RESIDUE_GRANULARITY_SEGMENT)
+ hw->info |= SNDRV_PCM_INFO_BATCH;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ addr_widths = dma_caps.dst_addr_widths;
+ else
+ addr_widths = dma_caps.src_addr_widths;
+ }
+
+ /*
+ * If SND_DMAENGINE_PCM_DAI_FLAG_PACK is set keep
+ * hw.formats set to 0, meaning no restrictions are in place.
+ * In this case it's the responsibility of the DAI driver to
+ * provide the supported format information.
+ */
+ if (!(dma_data->flags & SND_DMAENGINE_PCM_DAI_FLAG_PACK))
+ /*
+ * Prepare formats mask for valid/allowed sample types. If the
+ * dma does not have support for the given physical word size,
+ * it needs to be masked out so user space can not use the
+ * format which produces corrupted audio.
+ * In case the dma driver does not implement the slave_caps the
+ * default assumption is that it supports 1, 2 and 4 bytes
+ * widths.
+ */
+ for (i = SNDRV_PCM_FORMAT_FIRST; i <= SNDRV_PCM_FORMAT_LAST; i++) {
+ int bits = snd_pcm_format_physical_width(i);
+
+ /*
+ * Enable only samples with DMA supported physical
+ * widths
+ */
+ switch (bits) {
+ case 8:
+ case 16:
+ case 24:
+ case 32:
+ case 64:
+ if (addr_widths & (1 << (bits / 8)))
+ hw->formats |= pcm_format_to_bits(i);
+ break;
+ default:
+ /* Unsupported types */
+ break;
+ }
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_refine_runtime_hwparams);
+
MODULE_LICENSE("GPL");