linux-kernel - Re: [PATCH v5 10/15] drm/bridge: tc358767: Add support for address-only I2C transfers

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Message-ID: <CAHQ1cqG7dPFarphmBWSSqYAuO=6Kev4eFsBM09zUDJFek3UaOg@mail.gmail.com>
Date:   Wed, 12 Jun 2019 09:22:27 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     Tomi Valkeinen <tomi.valkeinen@...com>
Cc:     dri-devel@...ts.freedesktop.org,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Andrey Gusakov <andrey.gusakov@...entembedded.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Cory Tusar <cory.tusar@....aero>,
        Chris Healy <cphealy@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 10/15] drm/bridge: tc358767: Add support for
 address-only I2C transfers

On Wed, Jun 12, 2019 at 5:48 AM Tomi Valkeinen <tomi.valkeinen@...com> wrote:
>
> Hi,
>
> On 12/06/2019 11:32, Andrey Smirnov wrote:
> > Transfer size of zero means a request to do an address-only
> > transfer. Since the HW support this, we probably shouldn't be just
> > ignoring such requests. While at it allow DP_AUX_I2C_MOT flag to pass
> > through, since it is supported by the HW as well.
>
> I bisected the EDID read issue to this patch...
>

I don't think I've had any problems on my end with this. I'll double
check. It might be the case that yours is the only setup where the
problem can be repro'd, though. We can drop this patch if you don't
have time/would rather not dig into this.

Thanks,
Andrey Smirnov