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Date: Tue, 25 Aug 2020 09:32:19 +0200 From: Guido Günther <agx@...xcpu.org> To: Swapnil Kashinath Jakhade <sjakhade@...ence.com> Cc: Tomi Valkeinen <tomi.valkeinen@...com>, "airlied@...ux.ie" <airlied@...ux.ie>, "daniel@...ll.ch" <daniel@...ll.ch>, "Laurent.pinchart@...asonboard.com" <Laurent.pinchart@...asonboard.com>, "robh+dt@...nel.org" <robh+dt@...nel.org>, "a.hajda@...sung.com" <a.hajda@...sung.com>, "narmstrong@...libre.com" <narmstrong@...libre.com>, "jonas@...boo.se" <jonas@...boo.se>, "jernej.skrabec@...l.net" <jernej.skrabec@...l.net>, "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>, Milind Parab <mparab@...ence.com>, Yuti Suresh Amonkar <yamonkar@...ence.com>, "praneeth@...com" <praneeth@...com>, "nsekhar@...com" <nsekhar@...com>, "jsarha@...com" <jsarha@...com>, "sandor.yu@....com" <sandor.yu@....com> Subject: Re: [PATCH v8 0/3] drm: Add support for Cadence MHDP DPI/DP bridge and J721E wrapper. Hi Swapnil, On Mon, Aug 24, 2020 at 07:16:31AM +0000, Swapnil Kashinath Jakhade wrote: [..snip..] > Following are the differences between MHDP IPs from Cadence for Rockchip, TI and NxP: > > The Rockchip and NXP MHDP Core shares the same part (IP8501) which is DP v1.3 SST > Controller with HDCP 2.2/1.x. NXP's version additionally supports HDMI. > TI uses a different part (IP8546A), which is DP v1.4 with HDCP 2.2/1.x. > TI DP Controller adds support for additional features such as Multi Stream Support (MST), > Forward Error Correction (FEC) and Compression (DSC). > > Also, FW used for TI has significant differences than FW used for Rockchip or NXP. > NxP and TI firmware are developed and maintained separately by Cadence and are in > active support. > > From the Linux driver perspective, given the differences, it would make sense to have > TI driver maintained separately. Thanks for the clarification, that indeed helps a lot. So the rockchip and nxp drivers can be merged while the ti one should stay separate. Cheers, -- Guido > > Thanks, > Swapnil > > > > > > I'm worried that if there are IP differences, even if not great ones, > > > and if the FWs are different and developed separately, it'll be a > > > constant "fix X for SoC A, and accidentally break Y for SoC B and C", > > especially if too much code is shared. > > > > > > In the long run I'm all for a single driver (or large shared parts), > > > but I'm not sure if we should start with that approach. > > > > > > > > > > > > > > Tomi > > > > > > -- > > > Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. > > > Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki > > > >
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