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: Takashi Iwai <tiwai@suse.de>

1 files changed, 13 insertions, 0 deletions

diff --git a/sound/pci/hda/Kconfig b/sound/pci/hda/Kconfig
index 70762fca57ee..1f1a4ae4b791 100644
--- a/sound/pci/hda/Kconfig
+++ b/sound/pci/hda/Kconfig
@@ -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