From 2a031a99428bafba089437e9044b8fd5dc6e7551 Mon Sep 17 00:00:00 2001
From: Richard Fitzgerald <rf@opensource.cirrus.com>
Date: Fri, 15 Oct 2021 14:36:13 +0100
Subject: [PATCH] ASoC: cs42l42: Don't claim to support 192k
Git-commit: 2a031a99428bafba089437e9044b8fd5dc6e7551
Patch-mainline: v5.16-rc1
References: bsc#1203699

The driver currently only supports configuring for sample rates <= 96k
and it isn't possible to setup a configuration that will support all
sample rates up to 192k.

For sample rates up to 96k MCLK is in the 12MHz group.
However, although 192k only requires an I2S clock in the 12MHz group,
the cs42l42 audio path is not natively 192k so the audio must be
resampled. But for 192k the SRC requires a 24MHz MCLK.

It is not possible to switch MCLK between 12MHz and 24MHz groups
on-the-fly. The 12MHz group supports all sample rates up to 96k.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20211015133619.4698-11-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 sound/soc/codecs/cs42l42.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c
index dc84b3de3da3..71390c20e7a1 100644
--- a/sound/soc/codecs/cs42l42.c
+++ b/sound/soc/codecs/cs42l42.c
@@ -812,7 +812,7 @@ static int cs42l42_dai_startup(struct snd_pcm_substream *substream, struct snd_s
 	/* Machine driver has not set a SCLK, limit bottom end to 44.1 kHz */
 	return snd_pcm_hw_constraint_minmax(substream->runtime,
 					    SNDRV_PCM_HW_PARAM_RATE,
-					    44100, 192000);
+					    44100, 96000);
 }
 
 static int cs42l42_pcm_hw_params(struct snd_pcm_substream *substream,
@@ -1008,14 +1008,14 @@ static struct snd_soc_dai_driver cs42l42_dai = {
 			.stream_name = "Playback",
 			.channels_min = 1,
 			.channels_max = 2,
-			.rates = SNDRV_PCM_RATE_8000_192000,
+			.rates = SNDRV_PCM_RATE_8000_96000,
 			.formats = CS42L42_FORMATS,
 		},
 		.capture = {
 			.stream_name = "Capture",
 			.channels_min = 1,
 			.channels_max = 2,
-			.rates = SNDRV_PCM_RATE_8000_192000,
+			.rates = SNDRV_PCM_RATE_8000_96000,
 			.formats = CS42L42_FORMATS,
 		},
 		.symmetric_rate = 1,
-- 
2.35.3