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authorClaudio Foellmi <claudio.foellmi@ergon.ch>2017-10-04 12:43:45 +0300
committerWolfram Sang <wsa@the-dreams.de>2017-10-30 17:18:31 +0300
commit93367bfca98f36cece57c01dbce6ea1b4ac58245 (patch)
tree3752c6741d03204705ee9764649af1a9b10668ad /drivers/reset/Makefile
parent1f35b8653687b9c08c8d58489c1b5cb9cf961c17 (diff)
downloadlinux-93367bfca98f36cece57c01dbce6ea1b4ac58245.tar.xz
i2c: omap: Trigger bus recovery in lockup case
A very conservative check for bus activity (to prevent interference in multimaster setups) prevented the bus recovery methods from being triggered in the case that SDA or SCL was stuck low. This defeats the purpose of the recovery mechanism, which was introduced for exactly this situation (a slave device keeping SDA pulled down). Also added a check to make sure SDA is low before attempting recovery. If SDA is not stuck low, recovery will not help, so we can skip it. Note that bus lockups can persist across reboots. The only other options are to reset or power cycle the offending slave device, and many i2c slaves do not even have a reset pin. If we see that one of the lines is low for the entire timeout duration, we can actually be sure that there is no other master driving the bus. It is therefore save for us to attempt a bus recovery. Signed-off-by: Claudio Foellmi <claudio.foellmi@ergon.ch> Tested-by: Vignesh R <vigneshr@ti.com> Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com> [wsa: fixed one return code to -EBUSY] Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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