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authorBen Gardner <gardner.ben@gmail.com>2018-02-14 18:29:52 +0300
committerWolfram Sang <wsa@the-dreams.de>2018-02-21 11:15:47 +0300
commitfba4adbbf670577e605f9ad306629db6031cd48b (patch)
treed2ba3f45d4edbeed43f974758cafa60837de3455 /Documentation/i2c
parent91ab883eb21325ad80f3473633f794c78ac87f51 (diff)
downloadlinux-fba4adbbf670577e605f9ad306629db6031cd48b.tar.xz
i2c: designware: must wait for enable
One I2C bus on my Atom E3845 board has been broken since 4.9. It has two devices, both declared by ACPI and with built-in drivers. There are two back-to-back transactions originating from the kernel, one targeting each device. The first transaction works, the second one locks up the I2C controller. The controller never recovers. These kernel logs show up whenever an I2C transaction is attempted after this failure. i2c-designware-pci 0000:00:18.3: timeout in disabling adapter i2c-designware-pci 0000:00:18.3: timeout waiting for bus ready Waiting for the I2C controller status to indicate that it is enabled before programming it fixes the issue. I have tested this patch on 4.14 and 4.15. Fixes: commit 2702ea7dbec5 ("i2c: designware: wait for disable/enable only if necessary") Cc: linux-stable <stable@vger.kernel.org> #4.13+ Signed-off-by: Ben Gardner <gardner.ben@gmail.com> Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Reviewed-by: José Roberto de Souza <jose.souza@intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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