linux-kernel - Re: [PATCH v3 0/5] drm: add support for Cadence MHDP DPI/DP bridge.

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Date:   Thu, 13 Sep 2018 14:31:45 +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@...tlin.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, stelford@...ence.com, jartur@...ence.com,
        piotrs@...ence.com
Subject: Re: [PATCH v3 0/5] drm: add support for Cadence MHDP DPI/DP bridge.

Am Dienstag, 28. August 2018, 12:24:43 CEST schrieb Damian Kos:
> Hello!
> 
> This is the series of patches that will add support for the Cadence's DPI/DP
> bridge. Please note that this is a preliminary version of the driver and there
> will be more patches in the future with updates, fixes and improvements.
> Please keep that in mind when looking at FIXME/TODO/XXX comments.
> 
> Initially, MHDP driver was developed as a DRM bridge driver and was planed to
> be placed in drivers/gpu/drm/bridge/mhdp.c.  However, there was already
> a driver for Cadence's DP controller developed by RockChip, but that driver
> uses the different DRM framework and looks like a part of a bigger system.
> Both controllers (including firmware) are quite different internally
> (MST/FEC/DSC support, link training done by driver, additional commands, IRQ's
> etc.) but they have similar register map, except for Framer/Streamer (which is
> noticeably different), so they appear similar.
> 
> The following patches contain:
> - Moving common code to drivers/gpu/drm/bridge/cdns-mhdp-common.* and
>   modifying it a bit (mostly new prefixes for functions and data types) so it
>   can be used by two, higher level, drivers.
> - Modifying existing RockChip's DP driver to use the common code after changes
>   made to it (use the new cdns_mhdp_device structure and new function names).
> - Modifying DRM helpers a bit. Some are required for new driver, some are
>   updates from DP 1.2 to 1.3 or 1.4.
> - Adding documentation for device tree bindings.
> - Adding preliminary Cadence DPI/DP bridge driver.
> 
> Some of the things that will be added later on include (but are not limited
> to):
> - Support for Cadence SD0801 PHY (PHY's driver should be on the way by now)
> - MST support
> - DSC support
> - FEC support
> - HDCP support

with te Kconfig issue in patch5 fixed, this series tested on
rk3288 (analogix-dp) and rk3399 (analogix-dp + cadence-dp)
Everything seems to work that worked before.

Tested-by: Heiko Stuebner <heiko@...ech.de>