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Subject: Re: [PATCH v3 2/5] drm/dp: fix link probing for devices supporting
 DP 1.4+
To:     Damian Kos <dkos@cadence.com>, David Airlie <airlied@linux.ie>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Archit Taneja <architt@codeaurora.org>,
        Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
        Gustavo Padovan <gustavo@padovan.org>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Sean Paul <sean@poorly.run>, Sandy Huang <hjc@rock-chips.com>,
        =?UTF-8?Q?Heiko_St=c3=bcbner?= <heiko@sntech.de>,
        Quentin Schulz <quentin.schulz@bootlin.com>,
        dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-rockchip@lists.infradead.org
Cc:     pgaj@cadence.com, ltyrala@cadence.com, stelford@cadence.com,
        jartur@cadence.com, piotrs@cadence.com
From:   Andrzej Hajda <a.hajda@samsung.com>
Date:   Thu, 13 Sep 2018 13:08:27 +0200
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On 28.08.2018 12:24, Damian Kos wrote:
> From: Quentin Schulz <quentin.schulz@bootlin.com>
>
> DP 1.4 introduced a DP_EXTENDED_RCVR_CAPA_FIELD_PRESENT bit in
> DP_TRAINING_AUX_RD_INTERVAL register. If set, DPCD registers from DP_DPCD_REV
> to DP_ADAPTER_CAP should be retrieved starting from DP_DPCD_REV_EXTENDED.
> All registers are copied except DP_DPCD_REV, DP_MAX_LINK_RATE and
> DP_DOWNSTREAMPORT_PRESENT which represent the "true capabilities" of DPRX
> device.
>
> Original DP_DPCD_REV, DP_MAX_LINK_RATE and DP_DOWNSTREAMPORT_PRESENT might
> falsely return lower capabilities to "avoid interoperability issues with some
> of the existing DP Source devices that malfunction when they discover the
> higher capabilities within those three registers.".
>
> Before DP 1.4, DP_EXTENDED_RCVR_CAPA_FIELD_PRESENT bit was reserved and read 0
> so it's safe to check against it even if DP revision is <1.4
>
> Signed-off-by: Damian Kos <dkos@cadence.com>

Here and in next patches signed-off-by of the author is missing.

With that fixed:
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>

 --
Regards
Andrzej