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

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Date:   Tue, 18 Sep 2018 13:18:07 +0000
From:   Damian Kos <dkos@...ence.com>
To:     Heiko Stuebner <heiko@...ech.de>
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" <dri-devel@...ts.freedesktop.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-rockchip@...ts.infradead.org" 
        <linux-rockchip@...ts.infradead.org>,
        Przemyslaw Gaj <pgaj@...ence.com>,
        Lukasz Tyrala <ltyrala@...ence.com>,
        Scott Telford <stelford@...ence.com>,
        Artur Jedrysek <jartur@...ence.com>,
        Piotr Sroka <piotrs@...ence.com>
Subject: RE: [PATCH v3 0/5] drm: add support for Cadence MHDP DPI/DP bridge.

Got it.

-depends on EXTCON=y || (EXTCON=m && DRM_ROCKCHIP=m)
+depends on DRM_ROCKCHIP=m
+select EXTCON

Damian
-----Original Message-----
From: Heiko Stuebner <heiko@...ech.de> 
Sent: Thursday, September 13, 2018 14:32
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; Przemyslaw Gaj <pgaj@...ence.com>; Lukasz Tyrala <ltyrala@...ence.com>; Scott Telford <stelford@...ence.com>; Artur Jedrysek <jartur@...ence.com>; Piotr Sroka <piotrs@...ence.com>
Subject: Re: [PATCH v3 0/5] drm: add support for Cadence MHDP DPI/DP bridge.

EXTERNAL MAIL


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>