This is a note to let you know that I've just added the patch titled
ASoC: imx-card: improve the sound quality for low rate
to the 5.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
asoc-imx-card-improve-the-sound-quality-for-low-rate.patch
and it can be found in the queue-5.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 1bc5f78f9d6641719e40b4dc68482bcc331aaa2b
Author: Shengjiu Wang <shengjiu.wang@xxxxxxx>
Date: Tue Jan 4 18:40:35 2022 +0800
ASoC: imx-card: improve the sound quality for low rate
[ Upstream commit 3969341813eb56d2dfc39bb64229359a6ae3c195 ]
According to RM, on auto mode:
For codec AK4458 and AK4497, the lowest ratio of MLCK/FS is 256
if sample rate is 8kHz-48kHz,
For codec AK5558, the lowest ratio of MLCK/FS is 512 if sample
rate is 8kHz-48kHz.
With these setting the sound quality for 8kHz-48kHz can be improved.
Fixes: aa736700f42f ("ASoC: imx-card: Add imx-card machine driver")
Signed-off-by: Shengjiu Wang <shengjiu.wang@xxxxxxx>
Link: https://lore.kernel.org/r/1641292835-19085-4-git-send-email-shengjiu.wang@xxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/sound/soc/fsl/imx-card.c b/sound/soc/fsl/imx-card.c
index 84a8dcdee9316..c7503a5f7cfbc 100644
--- a/sound/soc/fsl/imx-card.c
+++ b/sound/soc/fsl/imx-card.c
@@ -120,7 +120,7 @@ struct imx_card_data {
static struct imx_akcodec_fs_mul ak4458_fs_mul[] = {
/* Normal, < 32kHz */
- { .rmin = 8000, .rmax = 24000, .wmin = 1024, .wmax = 1024, },
+ { .rmin = 8000, .rmax = 24000, .wmin = 256, .wmax = 1024, },
/* Normal, 32kHz */
{ .rmin = 32000, .rmax = 32000, .wmin = 256, .wmax = 1024, },
/* Normal */
@@ -151,8 +151,8 @@ static struct imx_akcodec_fs_mul ak4497_fs_mul[] = {
* Table 7 - mapping multiplier and speed mode
* Tables 8 & 9 - mapping speed mode and LRCK fs
*/
- { .rmin = 8000, .rmax = 32000, .wmin = 1024, .wmax = 1024, }, /* Normal, <= 32kHz */
- { .rmin = 44100, .rmax = 48000, .wmin = 512, .wmax = 512, }, /* Normal */
+ { .rmin = 8000, .rmax = 32000, .wmin = 256, .wmax = 1024, }, /* Normal, <= 32kHz */
+ { .rmin = 44100, .rmax = 48000, .wmin = 256, .wmax = 512, }, /* Normal */
{ .rmin = 88200, .rmax = 96000, .wmin = 256, .wmax = 256, }, /* Double */
{ .rmin = 176400, .rmax = 192000, .wmin = 128, .wmax = 128, }, /* Quad */
{ .rmin = 352800, .rmax = 384000, .wmin = 128, .wmax = 128, }, /* Oct */
@@ -164,7 +164,7 @@ static struct imx_akcodec_fs_mul ak4497_fs_mul[] = {
* (Table 4 from datasheet)
*/
static struct imx_akcodec_fs_mul ak5558_fs_mul[] = {
- { .rmin = 8000, .rmax = 32000, .wmin = 1024, .wmax = 1024, },
+ { .rmin = 8000, .rmax = 32000, .wmin = 512, .wmax = 1024, },
{ .rmin = 44100, .rmax = 48000, .wmin = 512, .wmax = 512, },
{ .rmin = 88200, .rmax = 96000, .wmin = 256, .wmax = 256, },
{ .rmin = 176400, .rmax = 192000, .wmin = 128, .wmax = 128, },
