ASoC: rockchip: i2s: switch BCLK to GPIO

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We discoverd that the state of BCLK on, LRCLK off and SD_MODE on
may cause the speaker melting issue. Removing LRCLK while BCLK
is present can cause unexpected output behavior including a large
DC output voltage as described in the Max98357a datasheet.

In order to:
  1. prevent BCLK from turning on by other component.
  2. keep BCLK and LRCLK being present at the same time

This patch switches BCLK to GPIO func before LRCLK output, and
configures BCLK func back during LRCLK is output.

Without this fix, BCLK is turned on 11 ms earlier than LRCK by the
da7219.
With this fix, BCLK is turned on only 0.4 ms earlier than LRCK by
the rockchip codec.

Signed-off-by: Judy Hsiao <judyhsiao@chromium.org>
Link: https://lore.kernel.org/r/20220615045643.3137287-1-judyhsiao@chromium.org
Signed-off-by: Mark Brown <broonie@kernel.org>

...

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Judy Hsiao 2022-06-15 04:56:43 +00:00 • committed by Mark Brown

parent 57b06e9711

commit 44f362c2cc

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1 changed files with 129 additions and 31 deletions

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sound/soc/rockchip/rockchip_i2s.c

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