Re: [PATCH 5/7 v6] drm/i915/intel_i2c: use INDEX cycles for i2c read transactions

From: Daniel Kurtz
Date: Thu Mar 29 2012 - 04:37:49 EST

On Thu, Mar 29, 2012 at 2:52 AM, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote:
> On Thu, 29 Mar 2012 02:26:37 +0800, Daniel Kurtz <djkurtz@xxxxxxxxxxxx> wrote:
>> It is very common for an i2c device to require a small 1 or 2 byte write
>> followed by a read.  For example, when reading from an i2c EEPROM it is
>> common to write and address, offset or index followed by a reading some
>> values.
> Hmm, I have
> "gmbus1, bits 8-15: 8-bit GMBUS slave register
> This field is redundant and should not be used."
> Scary. :)

Perhaps INDEX ops are only available on some chipsets?
Is this something you can double check?

> Otherwise, the code itself looks correct and quite neatly done now.
> -Chris
> --
> Chris Wilson, Intel Open Source Technology Centre
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