5.15-stable review patch. If anyone has any objections, please let me know.
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From: Johan Hovold johan+linaro@kernel.org
commit 46188db080bd1df7d2d28031b89e56f2fdbabd67 upstream.
The LPASS WSA macro codec driver is updating the digital gain settings behind the back of user space on DAPM events if companding has been enabled.
As compander control is exported to user space, this can result in the digital gain setting being incremented (or decremented) every time the sound server is started and the codec suspended depending on what the UCM configuration looks like.
Soon enough playback will become distorted (or too quiet).
This is specifically a problem on the Lenovo ThinkPad X13s as this bypasses the limit for the digital gain setting that has been set by the machine driver.
Fix this by simply dropping the compander gain offset hack. If someone cares about modelling the impact of the compander setting this can possibly be done by exporting it as a volume control later.
Note that the volume registers still need to be written after enabling clocks in order for any prior updates to take effect.
Fixes: 2c4066e5d428 ("ASoC: codecs: lpass-wsa-macro: add dapm widgets and route") Cc: stable@vger.kernel.org # 5.11 Cc: Srinivas Kandagatla srinivas.kandagatla@linaro.org Signed-off-by: Johan Hovold johan+linaro@kernel.org Link: https://msgid.link/r/20240119112420.7446-4-johan+linaro@kernel.org Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- sound/soc/codecs/lpass-wsa-macro.c | 7 ------- 1 file changed, 7 deletions(-)
--- a/sound/soc/codecs/lpass-wsa-macro.c +++ b/sound/soc/codecs/lpass-wsa-macro.c @@ -1577,7 +1577,6 @@ static int wsa_macro_enable_interpolator u16 gain_reg; u16 reg; int val; - int offset_val = 0; struct wsa_macro *wsa = snd_soc_component_get_drvdata(component);
if (w->shift == WSA_MACRO_COMP1) { @@ -1616,10 +1615,8 @@ static int wsa_macro_enable_interpolator CDC_WSA_RX1_RX_PATH_MIX_SEC0, CDC_WSA_RX_PGA_HALF_DB_MASK, CDC_WSA_RX_PGA_HALF_DB_ENABLE); - offset_val = -2; } val = snd_soc_component_read(component, gain_reg); - val += offset_val; snd_soc_component_write(component, gain_reg, val); wsa_macro_config_ear_spkr_gain(component, wsa, event, gain_reg); @@ -1647,10 +1644,6 @@ static int wsa_macro_enable_interpolator CDC_WSA_RX1_RX_PATH_MIX_SEC0, CDC_WSA_RX_PGA_HALF_DB_MASK, CDC_WSA_RX_PGA_HALF_DB_DISABLE); - offset_val = 2; - val = snd_soc_component_read(component, gain_reg); - val += offset_val; - snd_soc_component_write(component, gain_reg, val); } wsa_macro_config_ear_spkr_gain(component, wsa, event, gain_reg);