i2c: i801: recover from hardware PEC errors

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On a CRC error while using hardware-supported PEC, an additional
error bit is set in the auxiliary status register.  If this bit
isn't cleared, all subsequent operations will fail, essentially
hanging the controller.

The fix is simple: check, report, and clear the bit in
i801_check_post().  Also, in case the driver starts with the
hardware in that state, clear it in i801_check_pre() as well.

Signed-off-by: Ellen Wang <ellen@cumulusnetworks.com>
Tested-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

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Ellen Wang 2016-07-01 22:42:15 +02:00 • committed by Wolfram Sang

parent e0f6431c1e

commit 97d34ec136

1 changed files with 51 additions and 2 deletions

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drivers/i2c/busses/i2c-i801.c

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