ALSA: hda/cs8409: Dont disable I2C clock between consecutive accesses

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Only disable I2C clock 25 ms after not being used.

The current implementation enables and disables the I2C clock for each
I2C transaction. Each enable/disable call requires two verb transactions.
This means each I2C transaction requires a total of four verb transactions
to enable and disable the clock.
However, if there are multiple consecutive I2C transactions, it is not
necessary to enable and disable the clock each time, instead it is more
efficient to enable the clock for the first transaction, and disable it
after the final transaction, which would improve performance.
This is achieved by using a timeout which disables the clock if no request
to enable the clock has occurred for 25 ms.

Signed-off-by: Lucas Tanure <tanureal@opensource.cirrus.com>
Signed-off-by: Vitaly Rodionov <vitalyr@opensource.cirrus.com>
Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20210811185654.6837-14-vitalyr@opensource.cirrus.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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Lucas Tanure 2021-08-11 19:56:40 +01:00 • committed by Takashi Iwai

parent b2a887748e

commit 647d50a0c3

2 changed files with 74 additions and 18 deletions

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88

sound/pci/hda/patch_cs8409.c

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4

sound/pci/hda/patch_cs8409.h

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