linux-kernel - [PATCH v2 04/17] ASoC: sun8i-codec: Use the provided word size

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Date:   Wed, 14 Oct 2020 01:19:28 -0500
From:   Samuel Holland <samuel@...lland.org>
To:     Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>, Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>
Cc:     Ondrej Jirman <megous@...ous.com>, alsa-devel@...a-project.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Samuel Holland <samuel@...lland.org>
Subject: [PATCH v2 04/17] ASoC: sun8i-codec: Use the provided word size

The hardware supports 8 to 24-bit word sizes on all three of its DAIs,
only one of which is connected to the CPU DAI. Program the word size
based on the actual selected format, instead of assuming limitations
from another driver (which, incedentally, has patches pending to remove
that limitation).

Acked-by: Maxime Ripard <mripard@...nel.org>
Signed-off-by: Samuel Holland <samuel@...lland.org>
---
 sound/soc/sunxi/sun8i-codec.c | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/sound/soc/sunxi/sun8i-codec.c b/sound/soc/sunxi/sun8i-codec.c
index 77eb0fd01e3d..82576066c249 100644
--- a/sound/soc/sunxi/sun8i-codec.c
+++ b/sound/soc/sunxi/sun8i-codec.c
@@ -43,17 +43,16 @@
 #define SUN8I_SYS_SR_CTRL_AIF1_FS			12
 #define SUN8I_SYS_SR_CTRL_AIF2_FS			8
 #define SUN8I_AIF1CLK_CTRL				0x040
 #define SUN8I_AIF1CLK_CTRL_AIF1_MSTR_MOD		15
 #define SUN8I_AIF1CLK_CTRL_AIF1_CLK_INV			13
 #define SUN8I_AIF1CLK_CTRL_AIF1_BCLK_DIV		9
 #define SUN8I_AIF1CLK_CTRL_AIF1_LRCK_DIV		6
 #define SUN8I_AIF1CLK_CTRL_AIF1_WORD_SIZ		4
-#define SUN8I_AIF1CLK_CTRL_AIF1_WORD_SIZ_16		(1 << 4)
 #define SUN8I_AIF1CLK_CTRL_AIF1_DATA_FMT		2
 #define SUN8I_AIF1_ADCDAT_CTRL				0x044
 #define SUN8I_AIF1_ADCDAT_CTRL_AIF1_AD0L_ENA		15
 #define SUN8I_AIF1_ADCDAT_CTRL_AIF1_AD0R_ENA		14
 #define SUN8I_AIF1_ADCDAT_CTRL_AIF1_AD0L_SRC		10
 #define SUN8I_AIF1_ADCDAT_CTRL_AIF1_AD0R_SRC		8
 #define SUN8I_AIF1_DACDAT_CTRL				0x048
 #define SUN8I_AIF1_DACDAT_CTRL_AIF1_DA0L_ENA		15
@@ -317,26 +316,40 @@ static int sun8i_codec_get_lrck_div(unsigned int channels,
 	return ilog2(div) - 4;
 }
 
 static int sun8i_codec_hw_params(struct snd_pcm_substream *substream,
 				 struct snd_pcm_hw_params *params,
 				 struct snd_soc_dai *dai)
 {
 	struct sun8i_codec *scodec = snd_soc_dai_get_drvdata(dai);
-	int sample_rate, lrck_div;
+	int lrck_div, sample_rate, word_size;
 	u8 bclk_div;
 
-	/*
-	 * The CPU DAI handles only a sample of 16 bits. Configure the
-	 * codec to handle this type of sample resolution.
-	 */
+	/* word size */
+	switch (params_width(params)) {
+	case 8:
+		word_size = 0x0;
+		break;
+	case 16:
+		word_size = 0x1;
+		break;
+	case 20:
+		word_size = 0x2;
+		break;
+	case 24:
+		word_size = 0x3;
+		break;
+	default:
+		return -EINVAL;
+	}
+
 	regmap_update_bits(scodec->regmap, SUN8I_AIF1CLK_CTRL,
 			   SUN8I_AIF1CLK_CTRL_AIF1_WORD_SIZ_MASK,
-			   SUN8I_AIF1CLK_CTRL_AIF1_WORD_SIZ_16);
+			   word_size << SUN8I_AIF1CLK_CTRL_AIF1_WORD_SIZ);
 
 	bclk_div = sun8i_codec_get_bclk_div(scodec, params_rate(params), 16);
 	regmap_update_bits(scodec->regmap, SUN8I_AIF1CLK_CTRL,
 			   SUN8I_AIF1CLK_CTRL_AIF1_BCLK_DIV_MASK,
 			   bclk_div << SUN8I_AIF1CLK_CTRL_AIF1_BCLK_DIV);
 
 	lrck_div = sun8i_codec_get_lrck_div(params_channels(params),
 					    params_physical_width(params));
-- 
2.26.2