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

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Message-ID: <20200717194849.GA2369507@ravnborg.org>
Date:   Fri, 17 Jul 2020 21:48:49 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     Laurentiu Palcu <laurentiu.palcu@....nxp.com>
Cc:     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>, agx@...xcpu.org,
        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 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.

	Sam