ASoC: rsnd: explain SRC bypass mode settings in comment
SRC bypass mode is useful for debugging. This patch explains SRC bypass mode settings in comment Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Mark Brown <broonie@linaro.org>
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@ -40,6 +40,51 @@ struct rsnd_scu {
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*
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*/
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/*
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* How to use SRC bypass mode for debugging
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*
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* SRC has bypass mode, and it is useful for debugging.
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* In Gen2 case,
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* SRCm_MODE controls whether SRC is used or not
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* SSI_MODE0 controls whether SSIU which receives SRC data
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* is used or not.
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* Both SRCm_MODE/SSI_MODE0 settings are needed if you use SRC,
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* but SRC bypass mode needs SSI_MODE0 only.
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*
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* This driver request
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* struct rsnd_scu_platform_info {
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* u32 flags;
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* u32 convert_rate;
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* }
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*
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* rsnd_scu_hpbif_is_enable() will be true
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* if flags had RSND_SCU_USE_HPBIF,
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* and it controls whether SSIU is used or not.
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*
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* rsnd_scu_convert_rate() indicates
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* above convert_rate, and it controls
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* whether SRC is used or not.
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*
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* ex) doesn't use SRC
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* struct rsnd_scu_platform_info info = {
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* .flags = 0,
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* .convert_rate = 0,
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* };
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*
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* ex) uses SRC
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* struct rsnd_scu_platform_info info = {
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* .flags = RSND_SCU_USE_HPBIF,
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* .convert_rate = 48000,
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* };
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*
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* ex) uses SRC bypass mode
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* struct rsnd_scu_platform_info info = {
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* .flags = RSND_SCU_USE_HPBIF,
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* .convert_rate = 0,
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* };
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*
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*/
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#define rsnd_mod_to_scu(_mod) \
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container_of((_mod), struct rsnd_scu, mod)
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