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ASoC: rockchip: Fix mono capture

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[ Upstream commit 789e162a62 ]

This reverts commit db51707b9c.
Revert "ASoC: rockchip: i2s: Support mono capture"

Previous discussion in

https://patchwork.kernel.org/patch/10147153/

explains the issue of the patch.
While device is configured as 1-ch, hardware is still
generating a 2-ch stream.
When user space reads the data and assumes it is a 1-ch stream,
the rate will be slower by 2x.

Revert the change so 1-ch is not supported.
User space can selectively take one channel data out of two channel
if 1-ch is preferred.
Currently, both channels record identical data.

Signed-off-by: Cheng-Yi Chiang <cychiang@chromium.org>
Link: https://lore.kernel.org/r/20190726044202.26866-1-cychiang@chromium.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Cheng-Yi Chiang 2019-07-26 12:42:02 +08:00 • committed by Greg Kroah-Hartman
commit dd0ff288e3
1 changed files with 2 additions and 3 deletions
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5
sound/soc/rockchip/rockchip_i2s.c
View file

@ -329,7 +329,6 @@ static int rockchip_i2s_hw_params(struct snd_pcm_substream *substream,
val |= I2S_CHN_4;
break;
case 2:
case 1:
val |= I2S_CHN_2;
break;
default:
@ -462,7 +461,7 @@ static struct snd_soc_dai_driver rockchip_i2s_dai = {
},
.capture = {
.stream_name = "Capture",
.channels_min = 1,
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_192000,
.formats = (SNDRV_PCM_FMTBIT_S8 |
@ -662,7 +661,7 @@ static int rockchip_i2s_probe(struct platform_device *pdev)
}
if (!of_property_read_u32(node, "rockchip,capture-channels", &val)) {
if (val >= 1 && val <= 8)
if (val >= 2 && val <= 8)
soc_dai->capture.channels_max = val;
}