linux-kernel - [PATCH 5.18 0865/1095] ASoC: imx-card: Fix DSD/PDM mclk frequency

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Message-Id: <20220815180505.150844251@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 20:04:24 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Shengjiu Wang <shengjiu.wang@....com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 0865/1095] ASoC: imx-card: Fix DSD/PDM mclk frequency

From: Shengjiu Wang <shengjiu.wang@....com>

[ Upstream commit c0fabd12a8570cb932f13d9388f3d887ad44369b ]

The DSD/PDM rate not only DSD64/128/256/512, which are the
multiple rate of 44.1kHz,  but also support the multiple
rate of 8kHz, so can't force all mclk frequency to be
22579200Hz, need to assign the frequency according to
rate.

Fixes: aa736700f42f ("ASoC: imx-card: Add imx-card machine driver")
Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
Link: https://lore.kernel.org/r/1657100575-8261-1-git-send-email-shengjiu.wang@nxp.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/fsl/imx-card.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/sound/soc/fsl/imx-card.c b/sound/soc/fsl/imx-card.c
index 6f8efd838fcc..c0eb218a254b 100644
--- a/sound/soc/fsl/imx-card.c
+++ b/sound/soc/fsl/imx-card.c
@@ -17,6 +17,9 @@
 
 #include "fsl_sai.h"
 
+#define IMX_CARD_MCLK_22P5792MHZ  22579200
+#define IMX_CARD_MCLK_24P576MHZ   24576000
+
 enum codec_type {
 	CODEC_DUMMY = 0,
 	CODEC_AK5558 = 1,
@@ -353,9 +356,14 @@ static int imx_aif_hw_params(struct snd_pcm_substream *substream,
 		mclk_freq = akcodec_get_mclk_rate(substream, params, slots, slot_width);
 	else
 		mclk_freq = params_rate(params) * slots * slot_width;
-	/* Use the maximum freq from DSD512 (512*44100 = 22579200) */
-	if (format_is_dsd(params))
-		mclk_freq = 22579200;
+
+	if (format_is_dsd(params)) {
+		/* Use the maximum freq from DSD512 (512*44100 = 22579200) */
+		if (!(params_rate(params) % 11025))
+			mclk_freq = IMX_CARD_MCLK_22P5792MHZ;
+		else
+			mclk_freq = IMX_CARD_MCLK_24P576MHZ;
+	}
 
 	ret = snd_soc_dai_set_sysclk(cpu_dai, link_data->cpu_sysclk_id, mclk_freq,
 				     SND_SOC_CLOCK_OUT);
-- 
2.35.1