linux-kernel - Re: [PATCH v5 2/5] drm/dp: fix link probing for devices supporting DP 1.4+

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Date:   Tue, 25 Sep 2018 13:18:42 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     Damian Kos <dkos@...ence.com>
Cc:     David Airlie <airlied@...ux.ie>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Sean Paul <sean@...rly.run>, Sandy Huang <hjc@...k-chips.com>,
        Quentin Schulz <quentin.schulz@...e-electrons.com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, pgaj@...ence.com,
        ltyrala@...ence.com, rafalc@...ence.com, jartur@...ence.com,
        piotrs@...ence.com, quentin.schulz@...tlin.com, jbergsagel@...com
Subject: Re: [PATCH v5 2/5] drm/dp: fix link probing for devices supporting DP 1.4+

Hi Damian,

Am Dienstag, 25. September 2018, 11:13:32 CEST schrieb Damian Kos:
> From: Quentin Schulz <quentin.schulz@...e-electrons.com>
> 
> DP 1.4 introduced a DP_EXTENDED_RECEIVER_CAP_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_RECEIVER_CAP_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: Quentin Schulz <quentin.schulz@...e-electrons.com>
> Signed-off-by: Damian Kos <dkos@...ence.com>

in v4 you received a
	Reviewed-by: Manasi Navare <manasi.d.navare@...el.com>
for this patch. If a patch is largely unchanged from one version to another
please add these previously received tags to the commit message.
This prevents people from reviewing needlessly stuff twice ;-) .

So the above should read

----- 8< -----
Signed-off-by: Quentin Schulz <quentin.schulz@...e-electrons.com>
Signed-off-by: Damian Kos <dkos@...ence.com>
Reviewed-by: Manasi Navare <manasi.d.navare@...el.com>
----- 8< -----


Heiko