linux-kernel - Re: [PATCH v6 2/4] drm/imx: Add initial support for DCSS on iMX8MQ

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Message-ID: <20200718110525.GA2827@bogon.m.sigxcpu.org>
Date:   Sat, 18 Jul 2020 13:05:25 +0200
From:   Guido Günther <agx@...xcpu.org>
To:     Sam Ravnborg <sam@...nborg.org>
Cc:     Laurentiu Palcu <laurentiu.palcu@....nxp.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Lucas Stach <l.stach@...gutronix.de>, lukas@...mn.com,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v6 2/4] drm/imx: Add initial support for DCSS on iMX8MQ

Hi,
On Fri, Jul 17, 2020 at 09:48:49PM +0200, Sam Ravnborg wrote:
> Hi Laurentiu.
> 
> On Fri, Jul 17, 2020 at 05:41:27PM +0300, Laurentiu Palcu wrote:
> > From: Laurentiu Palcu <laurentiu.palcu@....com>
> > 
> > This adds initial support for iMX8MQ's Display Controller Subsystem (DCSS).
> > Some of its capabilities include:
> >  * 4K@...ps;
> >  * HDR10;
> >  * one graphics and 2 video pipelines;
> >  * on-the-fly decompression of compressed video and graphics;
> > 
> > The reference manual can be found here:
> > https://www.nxp.com/webapp/Download?colCode=IMX8MDQLQRM
> > 
> > The current patch adds only basic functionality: one primary plane for
> > graphics, linear, tiled and super-tiled buffers support (no graphics
> > decompression yet), no HDR10 and no video planes.
> > 
> > Video planes support and HDR10 will be added in subsequent patches once
> > per-plane de-gamma/CSC/gamma support is in.
> > 
> > Signed-off-by: Laurentiu Palcu <laurentiu.palcu@....com>
> > Reviewed-by: Lucas Stach <l.stach@...gutronix.de>
> > ---
> 
> ....
>         return drm_bridge_attach(encoder, bridge, NULL, 0);
> ....
> 
> The above code-snippet tells that the display-driver rely on the bridge
> to create the connector.
> Could this by any chance be updated to the new way where the display
> driver creates the connector - and thus passing DRM_BRIDGE_ATTACH_NO_CONNECTOR
> as the flags argument?
> 
> What bridges would be relevant?
> To check that the reelvant bridges are already ported.

I think that's mostly NWL atm since MHDP isn't mainline yet. Can you
recommend a bridge driver to look at that does this right?
Cheers,
 -- Guido