linux-kernel - [PATCH v4 07/22] ASoC: sun4i-i2s: Fix sun8i volatile regs

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Message-Id: <20200921102731.747736-8-peron.clem@gmail.com>
Date:   Mon, 21 Sep 2020 12:27:16 +0200
From:   Clément Péron <peron.clem@...il.com>
To:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Marcus Cooper <codekipper@...il.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com,
        Clément Péron <peron.clem@...il.com>
Subject: [PATCH v4 07/22] ASoC: sun4i-i2s: Fix sun8i volatile regs

The FIFO TX reg is volatile and sun8i i2s register
mapping is different from sun4i.

Even if in this case it's doesn't create an issue,
Avoid setting some regs that are undefined in sun8i.

Signed-off-by: Clément Péron <peron.clem@...il.com>
Acked-by: Maxime Ripard <mripard@...nel.org>
---
 sound/soc/sunxi/sun4i-i2s.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
index 60b2fec1bbe9..3f9110d70941 100644
--- a/sound/soc/sunxi/sun4i-i2s.c
+++ b/sound/soc/sunxi/sun4i-i2s.c
@@ -1152,12 +1152,19 @@ static bool sun8i_i2s_rd_reg(struct device *dev, unsigned int reg)
 
 static bool sun8i_i2s_volatile_reg(struct device *dev, unsigned int reg)
 {
-	if (reg == SUN8I_I2S_INT_STA_REG)
+	switch (reg) {
+	case SUN4I_I2S_FIFO_CTRL_REG:
+	case SUN4I_I2S_FIFO_RX_REG:
+	case SUN4I_I2S_FIFO_STA_REG:
+	case SUN4I_I2S_RX_CNT_REG:
+	case SUN4I_I2S_TX_CNT_REG:
+	case SUN8I_I2S_FIFO_TX_REG:
+	case SUN8I_I2S_INT_STA_REG:
 		return true;
-	if (reg == SUN8I_I2S_FIFO_TX_REG)
-		return false;
 
-	return sun4i_i2s_volatile_reg(dev, reg);
+	default:
+		return false;
+	}
 }
 
 static const struct reg_default sun4i_i2s_reg_defaults[] = {
-- 
2.25.1