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authorPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>2011-08-04 10:12:56 -0500
committerTakashi Iwai <tiwai@suse.de>2011-08-04 17:44:36 +0200
commit2ae66c26550cd94b0e2606a9275eb0ab7070ad0e (patch)
tree2822549ce2ef46d1499402139a2d8f484b00a3ff /Documentation/sound
parentd66fee5d65d947da32783ab0c32511ffe55ff5f3 (diff)
ALSA: hda: option to enable arbitrary buffer/period sizes
Add new parameter to disable rounding of buffer/period sizes to multiples of 128 bytes. This is more efficient in terms of memory access but isn't required by the HDA spec and prevents users from specifying exact period/buffer sizes. For example for 44.1kHz, a period size set to 20ms will be rounded to 19.59ms. Tested and enabled on Intel HDA controllers. Option is disabled by default for other controllers. Tested-by: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'Documentation/sound')
-rw-r--r--Documentation/sound/alsa/ALSA-Configuration.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index 89757012c7ff..27126c469f70 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -886,6 +886,11 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
disable)
power_save_controller - Reset HD-audio controller in power-saving mode
(default = on)
+ align_buffer_size - Force rounding of buffer/period sizes to multiples
+ of 128 bytes. This is more efficient in terms of memory
+ access but isn't required by the HDA spec and prevents
+ users from specifying exact period/buffer sizes.
+ (default = on)
This module supports multiple cards and autoprobe.