tree 6362a8d89171fba94539c0475d6b2ccb2ea9e7f2
parent 37ef01ab5d24d1d520dc79f6a98099d451c2a901
author Dmitry Torokhov <dmitry.torokhov@gmail.com> 1429634951 -0700
committer Jani Nikula <jani.nikula@intel.com> 1429822098 +0300

drm/i915: cope with large i2c transfers

The hardware, according to the specs, is limited to 256 byte transfers,
and current driver has no protections in case users attempt to do larger
transfers. The code will just stomp over status register and mayhem
ensues.

Let's split larger transfers into digestable chunks. Doing this allows
Atmel MXT driver on Pixel 1 function properly (it hasn't since commit
9d8dc3e529a19e427fd379118acd132520935c5d "Input: atmel_mxt_ts -
implement T44 message handling" which tries to consume multiple
touchscreen/touchpad reports in a single transaction).

Cc: stable@vger.kernel.org
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>