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authorClemens Ladisch <clemens@ladisch.de>2008-08-29 13:08:34 +0200
committerTakashi Iwai <tiwai@suse.de>2008-08-29 14:15:19 +0200
commitdf91bc23dcb052ff2da71b3482bf3c5fbf4b8a53 (patch)
treee74972c0522e55da1b027b60c4894c853a96a5ba
parent93a1a5eb70be5cc14990b97ef2460212e32658dc (diff)
downloadlinux-linaro-android-df91bc23dcb052ff2da71b3482bf3c5fbf4b8a53.tar.gz
ALSA: oxygen: fix distorted output on AK4396-based cards
When changing the sample rate, the CMI8788's master clock output becomes unstable for a short time. The AK4396 needs the master clock to do SPI writes, so writing to an AK4396 control register directly after a sample rate change will garble the value. In our case, this leads to the DACs being misconfigured to I2S sample format, which results in a wrong output level and horrible distortions on samples louder than -6 dB. To fix this, we need to wait until the new master clock signal has become stable before doing SPI writes. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r--sound/pci/oxygen/hifier.c4
-rw-r--r--sound/pci/oxygen/oxygen.c4
2 files changed, 8 insertions, 0 deletions
diff --git a/sound/pci/oxygen/hifier.c b/sound/pci/oxygen/hifier.c
index 7442460583d..dad393ae040 100644
--- a/sound/pci/oxygen/hifier.c
+++ b/sound/pci/oxygen/hifier.c
@@ -17,6 +17,7 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+#include <linux/delay.h>
#include <linux/pci.h>
#include <sound/control.h>
#include <sound/core.h>
@@ -107,6 +108,9 @@ static void set_ak4396_params(struct oxygen *chip,
else
value |= AK4396_DFS_QUAD;
data->ak4396_ctl2 = value;
+
+ msleep(1); /* wait for the new MCLK to become stable */
+
ak4396_write(chip, AK4396_CONTROL_1, AK4396_DIF_24_MSB);
ak4396_write(chip, AK4396_CONTROL_2, value);
ak4396_write(chip, AK4396_CONTROL_1, AK4396_DIF_24_MSB | AK4396_RSTN);
diff --git a/sound/pci/oxygen/oxygen.c b/sound/pci/oxygen/oxygen.c
index 7c8ae31eb46..c5829d30ef8 100644
--- a/sound/pci/oxygen/oxygen.c
+++ b/sound/pci/oxygen/oxygen.c
@@ -28,6 +28,7 @@
* GPIO 1 -> DFS1 of AK5385
*/
+#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <sound/ac97_codec.h>
@@ -213,6 +214,9 @@ static void set_ak4396_params(struct oxygen *chip,
else
value |= AK4396_DFS_QUAD;
data->ak4396_ctl2 = value;
+
+ msleep(1); /* wait for the new MCLK to become stable */
+
for (i = 0; i < 4; ++i) {
ak4396_write(chip, i,
AK4396_CONTROL_1, AK4396_DIF_24_MSB);