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Date:   Fri, 22 Mar 2019 15:14:41 +0200
From:   Tomi Valkeinen <>
To:     Andrey Smirnov <>,
CC:     Archit Taneja <>,
        Andrzej Hajda <>,
        Laurent Pinchart <>,
        Andrey Gusakov <>,
        Philipp Zabel <>,
        Chris Healy <>,
        Lucas Stach <>,
Subject: Re: [PATCH v2 08/15] drm/bridge: tc358767: Increase AUX transfer
 length limit

On 22/03/2019 05:28, Andrey Smirnov wrote:
> According to the datasheet tc358767 can transfer up to 16 bytes via
> its AUX channel, so the artificial limit of 8 apperas to be too
> low. However only up to 15-bytes seem to be actually supported and
> trying to use 16-byte transfers results in transfers failing
> sporadically (with bogus status in case of I2C transfers), so limit it
> to 15.

16 is the limit from the DP spec. I agree, 8 looks odd.

15 looks odd too, so I think it warrants a comment there in the code.

Does 15 byte transfers ever work? Or mostly works but sometimes fails?


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