ALSA: hda - Add Kconfig for the default buffer size (acfa634f) · Commits · 戴 / test

sound/pci/hda/Kconfig

+13 −0

Original line number	Diff line number	Diff line
		@@ -14,6 +14,19 @@ menuconfig SND_HDA_INTEL

		if SND_HDA_INTEL

		config SND_HDA_PREALLOC_SIZE
		int "Pre-allocated buffer size for HD-audio driver"
		range 0 32768
		default 64
		help
		Speficies the default pre-allocated buffer-size in kB for
		HD-audio driver. A larger buffer (e.g. 2048) is preferred
		for systems with PulseAudio. The default 64 is chosen just
		from the compatibility reason.

		Note that the pre-allocation size can be changed dynamically
		via a proc file (/proc/asound/card/pcm/sub*/prealloc), too.

		config SND_HDA_HWDEP
		bool "Build hwdep interface for HD-audio driver"
		select SND_HWDEP

+7 −1

Original line number	Diff line number	Diff line
		@@ -2075,6 +2075,8 @@ static void azx_pcm_free(struct snd_pcm *pcm)
		}
		}

		#define MAX_PREALLOC_SIZE (32 * 1024 * 1024)

		static int
		azx_attach_pcm_stream(struct hda_bus bus, struct hda_codec codec,
		struct hda_pcm *cpcm)
		@@ -2083,6 +2085,7 @@ azx_attach_pcm_stream(struct hda_bus bus, struct hda_codec codec,
		struct snd_pcm *pcm;
		struct azx_pcm *apcm;
		int pcm_dev = cpcm->device;
		unsigned int size;
		int s, err;

		if (pcm_dev >= HDA_MAX_PCMS) {
		@@ -2118,9 +2121,12 @@ azx_attach_pcm_stream(struct hda_bus bus, struct hda_codec codec,
		snd_pcm_set_ops(pcm, s, &azx_pcm_ops);
		}
		/* buffer pre-allocation */
		size = CONFIG_SND_HDA_PREALLOC_SIZE * 1024;
		if (size > MAX_PREALLOC_SIZE)
		size = MAX_PREALLOC_SIZE;
		snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
		snd_dma_pci_data(chip->pci),
		1024 * 64, 32 * 1024 * 1024);
		size, MAX_PREALLOC_SIZE);
		return 0;
		}