linux-kernel - [PATCH 7/7] ASoC: codecs: msm8916-wcd-digital: drop dead gain hacks

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Date: Tue, 16 Jan 2024 10:39:03 +0100
From: Johan Hovold <johan+linaro@...nel.org>
To: Mark Brown <broonie@...nel.org>
Cc: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	Banajit Goswami <bgoswami@...cinc.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	alsa-devel@...a-project.org,
	linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Johan Hovold <johan+linaro@...nel.org>
Subject: [PATCH 7/7] ASoC: codecs: msm8916-wcd-digital: drop dead gain hacks

The vendor driver appears to be modifying the gain settings behind the
back of user space but these hacks never made it upstream except for
some essentially dead code that reads out the (cached) gain setting and
writes it back again on DAPM events.

Drop these incomplete and pointless hacks.

Note that seemingly related 10 ms delay after enabling the interpolator
is removed in the process.

Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
 sound/soc/codecs/msm8916-wcd-digital.c | 26 +++-----------------------
 1 file changed, 3 insertions(+), 23 deletions(-)

diff --git a/sound/soc/codecs/msm8916-wcd-digital.c b/sound/soc/codecs/msm8916-wcd-digital.c
index 978c4d056e81..f73731aa4b58 100644
--- a/sound/soc/codecs/msm8916-wcd-digital.c
+++ b/sound/soc/codecs/msm8916-wcd-digital.c
@@ -228,17 +228,6 @@ struct msm8916_wcd_digital_priv {
 	struct clk *ahbclk, *mclk;
 };
 
-static const unsigned long rx_gain_reg[] = {
-	LPASS_CDC_RX1_VOL_CTL_B2_CTL,
-	LPASS_CDC_RX2_VOL_CTL_B2_CTL,
-	LPASS_CDC_RX3_VOL_CTL_B2_CTL,
-};
-
-static const unsigned long tx_gain_reg[] = {
-	LPASS_CDC_TX1_VOL_CTL_GAIN,
-	LPASS_CDC_TX2_VOL_CTL_GAIN,
-};
-
 static const char *const rx_mix1_text[] = {
 	"ZERO", "IIR1", "IIR2", "RX1", "RX2", "RX3"
 };
@@ -580,12 +569,6 @@ static int msm8916_wcd_digital_enable_interpolator(
 	struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
 
 	switch (event) {
-	case SND_SOC_DAPM_POST_PMU:
-		/* apply the digital gain after the interpolator is enabled */
-		usleep_range(10000, 10100);
-		snd_soc_component_write(component, rx_gain_reg[w->shift],
-			      snd_soc_component_read(component, rx_gain_reg[w->shift]));
-		break;
 	case SND_SOC_DAPM_POST_PMD:
 		snd_soc_component_update_bits(component, LPASS_CDC_CLK_RX_RESET_CTL,
 					      1 << w->shift, 1 << w->shift);
@@ -630,9 +613,6 @@ static int msm8916_wcd_digital_enable_dec(struct snd_soc_dapm_widget *w,
 		snd_soc_component_update_bits(component, tx_mux_ctl_reg,
 				    TX_MUX_CTL_HPF_BP_SEL_MASK,
 				    TX_MUX_CTL_HPF_BP_SEL_NO_BYPASS);
-		/* apply the digital gain after the decimator is enabled */
-		snd_soc_component_write(component, tx_gain_reg[w->shift],
-			      snd_soc_component_read(component, tx_gain_reg[w->shift]));
 		snd_soc_component_update_bits(component, tx_vol_ctl_reg,
 				    TX_VOL_CTL_CFG_MUTE_EN_MASK, 0);
 		break;
@@ -739,13 +719,13 @@ static const struct snd_soc_dapm_widget msm8916_wcd_digital_dapm_widgets[] = {
 	/* Interpolator */
 	SND_SOC_DAPM_MIXER_E("RX1 INT", LPASS_CDC_CLK_RX_B1_CTL, 0, 0, NULL,
 			     0, msm8916_wcd_digital_enable_interpolator,
-			     SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
+			     SND_SOC_DAPM_POST_PMD),
 	SND_SOC_DAPM_MIXER_E("RX2 INT", LPASS_CDC_CLK_RX_B1_CTL, 1, 0, NULL,
 			     0, msm8916_wcd_digital_enable_interpolator,
-			     SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
+			     SND_SOC_DAPM_POST_PMD),
 	SND_SOC_DAPM_MIXER_E("RX3 INT", LPASS_CDC_CLK_RX_B1_CTL, 2, 0, NULL,
 			     0, msm8916_wcd_digital_enable_interpolator,
-			     SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
+			     SND_SOC_DAPM_POST_PMD),
 	SND_SOC_DAPM_MUX("RX1 MIX1 INP1", SND_SOC_NOPM, 0, 0,
 			 &rx_mix1_inp1_mux),
 	SND_SOC_DAPM_MUX("RX1 MIX1 INP2", SND_SOC_NOPM, 0, 0,
-- 
2.41.0