kernel_5.10 no rt

hc

2023-12-11 6778948f9de86c3cfaf36725a7c87dcff9ba247f

 kernel/sound/soc/rockchip/rockchip_multi_dais_pcm.c
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@@ -20,6 +20,10 @@
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 #define MAX_FIFO_SIZE	32 /* max fifo size in frames */
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 #define SND_DMAENGINE_MPCM_DRV_NAME "snd_dmaengine_mpcm"
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+static unsigned int prealloc_buffer_size_kbytes = 512;
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+module_param(prealloc_buffer_size_kbytes, uint, 0444);
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+MODULE_PARM_DESC(prealloc_buffer_size_kbytes, "Preallocate DMA buffer size (KB).");
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+
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 struct dmaengine_mpcm {
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 	struct rk_mdais_dev *mdais;
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 	struct dma_chan *tx_chans[MAX_DAIS];
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@@ -563,7 +567,7 @@
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 	size_t max_buffer_size;
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 	unsigned int i;
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-	prealloc_buffer_size = 512 * 1024;
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+	prealloc_buffer_size = prealloc_buffer_size_kbytes * 1024;
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 	max_buffer_size = SIZE_MAX;
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 	for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
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@@ -685,6 +689,9 @@
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 	if (!pcm)
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 		return -ENOMEM;
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+#ifdef CONFIG_DEBUG_FS
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+	pcm->component.debugfs_prefix = "dma";
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+#endif
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 	pcm->mdais = mdais;
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 	for (i = 0; i < num; i++) {
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 		child = mdais->dais[i].dev;