[PATCH 1/2] drm/i915/intel_i2c: handle zero-length reads

Chris Wilson chris at chris-wilson.co.uk
Fri Apr 13 05:25:33 PDT 2012

On Fri, 13 Apr 2012 19:47:53 +0800, Daniel Kurtz <djkurtz at chromium.org> wrote:
> 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.
> Signed-off-by: Daniel Kurtz <djkurtz at chromium.org>

You earlier assuaged my fears that setting SW_READY without waiting
would anger the hw, so

Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>

Chris Wilson, Intel Open Source Technology Centre

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