The kcontrol put callback is expected to return 1 when there is change in HW or when the update is acknowledged by driver. This would ensure that change notifications are sent to subscribed applications. Filter out duplicate updates in SFC driver.
Fixes: b2f74ec53a6c ("ASoC: tegra: Add Tegra210 based SFC driver") Signed-off-by: Sameer Pujar spujar@nvidia.com Suggested-by: Jaroslav Kysela perex@perex.cz Suggested-by: Mark Brown broonie@kernel.org --- sound/soc/tegra/tegra210_sfc.c | 23 +++++++++++++++++------ 1 file changed, 17 insertions(+), 6 deletions(-)
diff --git a/sound/soc/tegra/tegra210_sfc.c b/sound/soc/tegra/tegra210_sfc.c index dc477ee..ac24980 100644 --- a/sound/soc/tegra/tegra210_sfc.c +++ b/sound/soc/tegra/tegra210_sfc.c @@ -3273,16 +3273,27 @@ static int tegra210_sfc_put_control(struct snd_kcontrol *kcontrol, struct tegra210_sfc *sfc = snd_soc_component_get_drvdata(cmpnt); int value = ucontrol->value.integer.value[0];
- if (strstr(kcontrol->id.name, "Input Stereo To Mono")) + if (strstr(kcontrol->id.name, "Input Stereo To Mono")) { + if (sfc->stereo_to_mono[SFC_RX_PATH] == value) + return 0; + sfc->stereo_to_mono[SFC_RX_PATH] = value; - else if (strstr(kcontrol->id.name, "Input Mono To Stereo")) + } else if (strstr(kcontrol->id.name, "Input Mono To Stereo")) { + if (sfc->mono_to_stereo[SFC_RX_PATH] == value) + return 0; + sfc->mono_to_stereo[SFC_RX_PATH] = value; - else if (strstr(kcontrol->id.name, "Output Stereo To Mono")) + } else if (strstr(kcontrol->id.name, "Output Stereo To Mono")) { + if (sfc->stereo_to_mono[SFC_TX_PATH] == value) + return 0; + sfc->stereo_to_mono[SFC_TX_PATH] = value; - else if (strstr(kcontrol->id.name, "Output Mono To Stereo")) + } else if (strstr(kcontrol->id.name, "Output Mono To Stereo")) { + if (sfc->mono_to_stereo[SFC_TX_PATH] == value) + return 0; + sfc->mono_to_stereo[SFC_TX_PATH] = value; - else - return 0; + }
return 1; }