drm/i915/intel_i2c: handle zero-length reads

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A common method of probing an i2c bus is trying to do a zero-length read.
Handle this case by checking the length first waiting for data to be read.

This is actually important, since attempting a zero-length read is one
of the ways that i2cdetect and i2c_new_probed_device detect whether
there is device present on the bus with a given address.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=48269
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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Daniel Kurtz 2012-04-13 19:47:53 +08:00 • committed by Daniel Vetter

parent f637fde434

commit 79985eee84

1 changed files with 2 additions and 2 deletions

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drivers/gpu/drm/i915/intel_i2c.c

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