linux-kernel - [PATCH v10 08/15] ASoC: sun4i-i2s: Fix setting of FIFO modes

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Date:   Fri, 30 Oct 2020 15:46:41 +0100
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, Samuel Holland <samuel@...lland.org>,
        Clément Péron <peron.clem@...il.com>
Subject: [PATCH v10 08/15] ASoC: sun4i-i2s: Fix setting of FIFO modes

From: Samuel Holland <samuel@...lland.org>

Because SUN4I_I2S_FIFO_CTRL_REG is volatile, writes done while the
regmap is cache-only are ignored. To work around this, move the
configuration to a callback that runs while the ASoC core has a
runtime PM reference to the device.

Signed-off-by: Samuel Holland <samuel@...lland.org>
Reviewed-by: Chen-Yu Tsai <wens@...e.org>
Acked-by: Maxime Ripard <mripard@...nel.org>
Signed-off-by: Clément Péron <peron.clem@...il.com>
---
 sound/soc/sunxi/sun4i-i2s.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
index 003610c0badf..4f5cd850752d 100644
--- a/sound/soc/sunxi/sun4i-i2s.c
+++ b/sound/soc/sunxi/sun4i-i2s.c
@@ -596,6 +596,13 @@ static int sun4i_i2s_hw_params(struct snd_pcm_substream *substream,
 		return ret;
 	}
 
+	/* Set significant bits in our FIFOs */
+	regmap_update_bits(i2s->regmap, SUN4I_I2S_FIFO_CTRL_REG,
+			   SUN4I_I2S_FIFO_CTRL_TX_MODE_MASK |
+			   SUN4I_I2S_FIFO_CTRL_RX_MODE_MASK,
+			   SUN4I_I2S_FIFO_CTRL_TX_MODE(1) |
+			   SUN4I_I2S_FIFO_CTRL_RX_MODE(1));
+
 	switch (params_physical_width(params)) {
 	case 16:
 		width = DMA_SLAVE_BUSWIDTH_2_BYTES;
@@ -924,13 +931,6 @@ static int sun4i_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 		return ret;
 	}
 
-	/* Set significant bits in our FIFOs */
-	regmap_update_bits(i2s->regmap, SUN4I_I2S_FIFO_CTRL_REG,
-			   SUN4I_I2S_FIFO_CTRL_TX_MODE_MASK |
-			   SUN4I_I2S_FIFO_CTRL_RX_MODE_MASK,
-			   SUN4I_I2S_FIFO_CTRL_TX_MODE(1) |
-			   SUN4I_I2S_FIFO_CTRL_RX_MODE(1));
-
 	i2s->format = fmt;
 
 	return 0;
-- 
2.25.1