Topic/asoc ch map mask fix - #5887
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Rename the ch_mask member of snd_soc_dai_link_ch_map to cpu_ch_mask, as that is what it is used for. The CPU and codec channel masks are not necessarily the same, and are quite likely different. SoundWire and I2S/TDM both support assigning different sample slots to each codec, so for example channel 0 on each codec could map to different channels at the CPU. So it's quite normal that the channel mask at the CPU end is different for each codec, but the codec channel masks are the same for each codec. Change-Id: Ia40e1f924320b1426ecbf4e04d3e2d8dc9e4a901 Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Add a codec_ch_mask member to snd_soc_dai_link_ch_map. The CPU and codec channel masks are not necessarily the same, and are quite likely different. SoundWire and I2S/TDM both support assigning different sample slots to each codec, so for example channel 0 on each codec could map to different channels at the CPU. So it's quite normal that the channel mask at the CPU end is different for each codec, but the codec channel masks are the same for each codec. Change-Id: Ie2b30fc2dab17a5b2062634fc6bc6439bf83f8e6 Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
…arams In __soc_pcm_hw_params() if there is a snd_soc_dai_link_ch_map with non-zero codec_ch_mask, use that channel mask to restrict which channels are enabled on the codec. But only if there isn't a TDM mask. It is possible that a snd_soc_dai_link_ch_map could include the same codec multiple times on different CPUs so the for_each_rtd_ch_maps() loop accumulates the channel masks for all entries of that codec. If a TDM mask was also set, it takes priority and is used instead of any possible snd_soc_dai_link_ch_map entries. (They cannot be ANDed together because the bit positions are indicating different things: TDM is a bit for each TDM slot, codec_ch_mask is a bit for each codec channel.) This fixes a problem of incorrect TX channels enabled on the codec when multiple codecs are aggregated on a single capture link. For example: - Two CPUs with six 4-channel codecs. - The machine driver chooses to assign one channel from each codec to one channel on the CPU - But the codec hw_params() would be passed a channel count of 6, which (a) is more channels than the codec has and (b) allows enabling channels that should not be driving the audio bus. Change-Id: I54fbdbe6768bec2cb2f2b50e922ac477b7317d90 Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
In asoc_sdw_hw_params() set the codec_ch_mask member of struct snd_soc_dai_link_ch_map for capture streams. ASoC will then pass the correct number of channels to each codec hw_params(). This prevents trying to enable more channels on the codec DP than have been allocated bitslots in the SoundWire frame, which would cause bus clash errors. In theory codec_ch_mask could also be set for playback streams, but for those the CPU is the only sender so there is no risk of bus clash. For playback streams codec_ch_mask is set to 0 to preserve the existing behavior and avoid introducing bugs. Change-Id: I0b6e362abda9d91c654140c2470546bc9b6a62b6 Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
…ixup Delete the asoc_sdw_cs_spk_feedback_rtd_init(). This is not needed now that the ASoC bug it was working around has been fixed. And it was broken anyway, creating a confusing mapping of amp channels to capture channels. This code was added to avoid a problem where multiple codec DP outputs were mapped to the same SoundWire frame bit slot. This would allow a user to break the SoundWire bus just by enabling mixer outputs using ALSA controls. As no production system has used the capture stream, this workaround was of little consequence and the problem of conflicting DP mappings was not investigated. The ASoC bug that enabled too many channels on each codec has now been fixed. So this workaround can be completely deleted. Change-Id: Ia4d193bf7db33179277d23a09090178918d2848a Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
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Fixes for ASoC not applying a channel count restriction to the codec end of a channel map.