linux-kernel - Re: [PATCH v3 2/4] drm/imx: Add initial support for DCSS on iMX8MQ

Open Source and information security mailing list archives

Date:   Wed, 26 Feb 2020 09:52:23 +0200
From:   Laurentiu Palcu <laurentiu.palcu@....nxp.com>
To:     Lucas Stach <l.stach@...gutronix.de>
Cc:     Laurentiu Palcu <laurentiu.palcu@....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>,
        linux-arm-kernel@...ts.infradead.org, agx@...xcpu.org,
        lukas@...mn.com, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v3 2/4] drm/imx: Add initial support for DCSS on iMX8MQ

Hi Lucas,

Thanks for taking some time to look over this series.

On Mon, Feb 24, 2020 at 06:27:25PM +0100, Lucas Stach wrote:
> Hi Laurentiu,
> 
> just a first drive-by comment, more in-depth review tomorrow.
> 
> On Fr, 2019-12-06 at 11:52 +0200, Laurentiu Palcu wrote:
> > 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>
> > ---
> [...]
> > diff --git a/drivers/gpu/drm/imx/dcss/Kconfig b/drivers/gpu/drm/imx/dcss/Kconfig
> > new file mode 100644
> > index 00000000..a189dac
> > --- /dev/null
> > +++ b/drivers/gpu/drm/imx/dcss/Kconfig
> > @@ -0,0 +1,8 @@
> > +config DRM_IMX_DCSS
> > +	tristate "i.MX8MQ DCSS"
> > +	select RESET_CONTROLLER
> > +	select IMX_IRQSTEER
> 
> This driver has no build time dependency on the IRQSTEER driver. It
> needs it at runtime, but those dependencies are normally not described
> in Kconfig.
> 
> On the other hand this is missing a "select DRM_KMS_CMA_HELPER".

Oops, I guess I missed this. I'll add it in next revision. Waiting for
your in-depth review first.

Thanks,
laurentiu

> 
> Regards,
> Lucas
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Laurentiu
NXP

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