linux-kernel - [PATCH] ASoC: mediatek: mt8188: correct etdm control return value

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Message-ID: <20230215125017.16044-1-trevor.wu@mediatek.com>
Date:   Wed, 15 Feb 2023 20:50:16 +0800
From:   Trevor Wu <trevor.wu@...iatek.com>
To:     <broonie@...nel.org>, <lgirdwood@...il.com>, <tiwai@...e.com>,
        <perex@...ex.cz>, <matthias.bgg@...il.com>
CC:     <trevor.wu@...iatek.com>, <alsa-devel@...a-project.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] ASoC: mediatek: mt8188: correct etdm control return value

In mt8188_etdm_clk_src_sel_put() function, val retrieved by FIELD_PREP
is shifted to the corresponding bit filed, so it can compare with the
register value directly.

Originally, the redundant bit shift of the register value results in
the wrong comparison result, so we remove bit shift operation in the
patch.

Fixes: 2babb4777489 ("ASoC: mediatek: mt8188: support etdm in platform driver")
Signed-off-by: Trevor Wu <trevor.wu@...iatek.com>
---
 sound/soc/mediatek/mt8188/mt8188-dai-etdm.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/sound/soc/mediatek/mt8188/mt8188-dai-etdm.c b/sound/soc/mediatek/mt8188/mt8188-dai-etdm.c
index 071841903c62..1c53d4cb19bb 100644
--- a/sound/soc/mediatek/mt8188/mt8188-dai-etdm.c
+++ b/sound/soc/mediatek/mt8188/mt8188-dai-etdm.c
@@ -679,7 +679,6 @@ static int mt8188_etdm_clk_src_sel_put(struct snd_kcontrol *kcontrol,
 	unsigned int old_val;
 	unsigned int mask;
 	unsigned int reg;
-	unsigned int shift;
 
 	if (source >= e->items)
 		return -EINVAL;
@@ -687,27 +686,22 @@ static int mt8188_etdm_clk_src_sel_put(struct snd_kcontrol *kcontrol,
 	if (!strcmp(kcontrol->id.name, "ETDM_OUT1_Clock_Source")) {
 		reg = ETDM_OUT1_CON4;
 		mask = ETDM_OUT_CON4_CLOCK_MASK;
-		shift = ETDM_OUT_CON4_CLOCK_SHIFT;
 		val = FIELD_PREP(ETDM_OUT_CON4_CLOCK_MASK, source);
 	} else if (!strcmp(kcontrol->id.name, "ETDM_OUT2_Clock_Source")) {
 		reg = ETDM_OUT2_CON4;
 		mask = ETDM_OUT_CON4_CLOCK_MASK;
-		shift = ETDM_OUT_CON4_CLOCK_SHIFT;
 		val = FIELD_PREP(ETDM_OUT_CON4_CLOCK_MASK, source);
 	} else if (!strcmp(kcontrol->id.name, "ETDM_OUT3_Clock_Source")) {
 		reg = ETDM_OUT3_CON4;
 		mask = ETDM_OUT_CON4_CLOCK_MASK;
-		shift = ETDM_OUT_CON4_CLOCK_SHIFT;
 		val = FIELD_PREP(ETDM_OUT_CON4_CLOCK_MASK, source);
 	} else if (!strcmp(kcontrol->id.name, "ETDM_IN1_Clock_Source")) {
 		reg = ETDM_IN1_CON2;
 		mask = ETDM_IN_CON2_CLOCK_MASK;
-		shift = ETDM_IN_CON2_CLOCK_SHIFT;
 		val = FIELD_PREP(ETDM_IN_CON2_CLOCK_MASK, source);
 	} else if (!strcmp(kcontrol->id.name, "ETDM_IN2_Clock_Source")) {
 		reg = ETDM_IN2_CON2;
 		mask = ETDM_IN_CON2_CLOCK_MASK;
-		shift = ETDM_IN_CON2_CLOCK_SHIFT;
 		val = FIELD_PREP(ETDM_IN_CON2_CLOCK_MASK, source);
 	} else {
 		return -EINVAL;
@@ -715,8 +709,6 @@ static int mt8188_etdm_clk_src_sel_put(struct snd_kcontrol *kcontrol,
 
 	regmap_read(afe->regmap, reg, &old_val);
 	old_val &= mask;
-	old_val >>= shift;
-
 	if (old_val == val)
 		return 0;
 
-- 
2.18.0