i2c: at91: Send bus clear command if SDA is down

Browse source

After a transfer timeout, some faulty I2C slave devices might hold down
the SDA pin. We can generate a bus clear command, hoping that the slave
might release the pins.
If the CLEAR command is not supported, we will use gpio recovery, if
available, to reset the bus.

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

...

This commit is contained in:

Codrin Ciubotariu 2020-02-25 17:50:09 +02:00 • committed by Wolfram Sang

parent e896be5ad1

commit 73371d5f31

3 changed files with 50 additions and 8 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

2

drivers/i2c/busses/i2c-at91-core.c

View file

49

drivers/i2c/busses/i2c-at91-master.c

View file

7

drivers/i2c/busses/i2c-at91.h

View file