Unverified Commit 39693418 authored by Shengjiu Wang's avatar Shengjiu Wang Committed by Mark Brown
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ASoC: imx-card: improve the sound quality for low rate 



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: aa736700 ("ASoC: imx-card: Add imx-card machine driver")
Signed-off-by: default avatarShengjiu Wang <shengjiu.wang@nxp.com>
Link: https://lore.kernel.org/r/1641292835-19085-4-git-send-email-shengjiu.wang@nxp.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent f331ae5f

sound/soc/fsl/imx-card.c

+4 −4
Original line number Diff line number Diff line
@@ -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, },