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author | Oleksandr Suvorov <oleksandr.suvorov@toradex.com> | 2019-10-09 14:29:41 +0000 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-17 13:40:57 -0700 |
commit | 82ea9d14f7534c1c5233e56fc9fc66a692facc4a (patch) | |
tree | c94a5ee5fcae5ffe29a2afed9f3043be1905bdd0 /kernel/panic.c | |
parent | fd27e0779cf62f72bd8242d003d30742d11e451e (diff) |
ASoC: sgtl5000: Improve VAG power and mute control
[ Upstream commit b1f373a11d25fc9a5f7679c9b85799fe09b0dc4a ]
VAG power control is improved to fit the manual [1]. This patch fixes as
minimum one bug: if customer muxes Headphone to Line-In right after boot,
the VAG power remains off that leads to poor sound quality from line-in.
I.e. after boot:
- Connect sound source to Line-In jack;
- Connect headphone to HP jack;
- Run following commands:
$ amixer set 'Headphone' 80%
$ amixer set 'Headphone Mux' LINE_IN
Change VAG power on/off control according to the following algorithm:
- turn VAG power ON on the 1st incoming event.
- keep it ON if there is any active VAG consumer (ADC/DAC/HP/Line-In).
- turn VAG power OFF when there is the latest consumer's pre-down event
come.
- always delay after VAG power OFF to avoid pop.
- delay after VAG power ON if the initiative consumer is Line-In, this
prevents pop during line-in muxing.
According to the data sheet [1], to avoid any pops/clicks,
the outputs should be muted during input/output
routing changes.
[1] https://www.nxp.com/docs/en/data-sheet/SGTL5000.pdf
Cc: stable@vger.kernel.org
Fixes: 9b34e6cc3bc2 ("ASoC: Add Freescale SGTL5000 codec support")
Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
Reviewed-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20190719100524.23300-3-oleksandr.suvorov@toradex.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'kernel/panic.c')
0 files changed, 0 insertions, 0 deletions