linux-kernel - [PATCH v2 3/3] ASoC: cs35l56: Remove SoundWire Clock Divider workaround for CS35L63

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Message-ID: <20250820125045.117740-4-sbinding@opensource.cirrus.com>
Date: Wed, 20 Aug 2025 13:50:36 +0100
From: Stefan Binding <sbinding@...nsource.cirrus.com>
To: Mark Brown <broonie@...nel.org>
Cc: linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org,
        patches@...nsource.cirrus.com,
        Stefan Binding <sbinding@...nsource.cirrus.com>
Subject: [PATCH v2 3/3] ASoC: cs35l56: Remove SoundWire Clock Divider workaround for CS35L63

Production silicon for CS36L63 has some small differences compared to
pre-production silicon. Remove soundwire clock workaround as no
longer necessary. We don't want to do tricks with low-level clocking
controls if we don't need to.

Fixes: d3197a09a117 ("ASoC: cs35l56: Add initial support for CS35L63 for I2C and SoundWire")

Signed-off-by: Stefan Binding <sbinding@...nsource.cirrus.com>
---
 sound/soc/codecs/cs35l56-sdw.c | 69 ----------------------------------
 sound/soc/codecs/cs35l56.h     |  3 --
 2 files changed, 72 deletions(-)

diff --git a/sound/soc/codecs/cs35l56-sdw.c b/sound/soc/codecs/cs35l56-sdw.c
index ee14031695a1..3905c9cb188a 100644
--- a/sound/soc/codecs/cs35l56-sdw.c
+++ b/sound/soc/codecs/cs35l56-sdw.c
@@ -393,74 +393,6 @@ static int cs35l56_sdw_update_status(struct sdw_slave *peripheral,
 	return 0;
 }
 
-static int cs35l63_sdw_kick_divider(struct cs35l56_private *cs35l56,
-				    struct sdw_slave *peripheral)
-{
-	unsigned int curr_scale_reg, next_scale_reg;
-	int curr_scale, next_scale, ret;
-
-	if (!cs35l56->base.init_done)
-		return 0;
-
-	if (peripheral->bus->params.curr_bank) {
-		curr_scale_reg = SDW_SCP_BUSCLOCK_SCALE_B1;
-		next_scale_reg = SDW_SCP_BUSCLOCK_SCALE_B0;
-	} else {
-		curr_scale_reg = SDW_SCP_BUSCLOCK_SCALE_B0;
-		next_scale_reg = SDW_SCP_BUSCLOCK_SCALE_B1;
-	}
-
-	/*
-	 * Current clock scale value must be different to new value.
-	 * Modify current to guarantee this. If next still has the dummy
-	 * value we wrote when it was current, the core code has not set
-	 * a new scale so restore its original good value
-	 */
-	curr_scale = sdw_read_no_pm(peripheral, curr_scale_reg);
-	if (curr_scale < 0) {
-		dev_err(cs35l56->base.dev, "Failed to read current clock scale: %d\n", curr_scale);
-		return curr_scale;
-	}
-
-	next_scale = sdw_read_no_pm(peripheral, next_scale_reg);
-	if (next_scale < 0) {
-		dev_err(cs35l56->base.dev, "Failed to read next clock scale: %d\n", next_scale);
-		return next_scale;
-	}
-
-	if (next_scale == CS35L56_SDW_INVALID_BUS_SCALE) {
-		next_scale = cs35l56->old_sdw_clock_scale;
-		ret = sdw_write_no_pm(peripheral, next_scale_reg, next_scale);
-		if (ret < 0) {
-			dev_err(cs35l56->base.dev, "Failed to modify current clock scale: %d\n",
-				ret);
-			return ret;
-		}
-	}
-
-	cs35l56->old_sdw_clock_scale = curr_scale;
-	ret = sdw_write_no_pm(peripheral, curr_scale_reg, CS35L56_SDW_INVALID_BUS_SCALE);
-	if (ret < 0) {
-		dev_err(cs35l56->base.dev, "Failed to modify current clock scale: %d\n", ret);
-		return ret;
-	}
-
-	dev_dbg(cs35l56->base.dev, "Next bus scale: %#x\n", next_scale);
-
-	return 0;
-}
-
-static int cs35l56_sdw_bus_config(struct sdw_slave *peripheral,
-				  struct sdw_bus_params *params)
-{
-	struct cs35l56_private *cs35l56 = dev_get_drvdata(&peripheral->dev);
-
-	if ((cs35l56->base.type == 0x63) && (cs35l56->base.rev < 0xa1))
-		return cs35l63_sdw_kick_divider(cs35l56, peripheral);
-
-	return 0;
-}
-
 static int __maybe_unused cs35l56_sdw_clk_stop(struct sdw_slave *peripheral,
 					       enum sdw_clk_stop_mode mode,
 					       enum sdw_clk_stop_type type)
@@ -476,7 +408,6 @@ static const struct sdw_slave_ops cs35l56_sdw_ops = {
 	.read_prop = cs35l56_sdw_read_prop,
 	.interrupt_callback = cs35l56_sdw_interrupt,
 	.update_status = cs35l56_sdw_update_status,
-	.bus_config = cs35l56_sdw_bus_config,
 #ifdef DEBUG
 	.clk_stop = cs35l56_sdw_clk_stop,
 #endif
diff --git a/sound/soc/codecs/cs35l56.h b/sound/soc/codecs/cs35l56.h
index bd77a57249d7..40a1800a4585 100644
--- a/sound/soc/codecs/cs35l56.h
+++ b/sound/soc/codecs/cs35l56.h
@@ -20,8 +20,6 @@
 #define CS35L56_SDW_GEN_INT_MASK_1	0xc1
 #define CS35L56_SDW_INT_MASK_CODEC_IRQ	BIT(0)
 
-#define CS35L56_SDW_INVALID_BUS_SCALE	0xf
-
 #define CS35L56_RX_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE)
 #define CS35L56_TX_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE \
 			    | SNDRV_PCM_FMTBIT_S32_LE)
@@ -52,7 +50,6 @@ struct cs35l56_private {
 	u8 asp_slot_count;
 	bool tdm_mode;
 	bool sysclk_set;
-	u8 old_sdw_clock_scale;
 	u8 sdw_link_num;
 	u8 sdw_unique_id;
 };
-- 
2.43.0