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Commit acfa634f authored by Takashi Iwai's avatar Takashi Iwai
Browse files

ALSA: hda - Add Kconfig for the default buffer size 



Add a Kconfig entry to specify the default buffer size.
Distros using PulseAudio can choose a larger value here.

Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 30b45033

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

sound/pci/hda/hda_intel.c

+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;

}