linux-kernel - Re: [PATCH] ARM: dts: da850: specify max width for display node

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Date:   Tue, 22 Nov 2016 12:27:33 +0200
From:   Tomi Valkeinen <tomi.valkeinen@...com>
To:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Michael Turquette <mturquette@...libre.com>,
        Sekhar Nori <nsekhar@...com>, Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Russell King <linux@...linux.org.uk>
CC:     LKML <linux-kernel@...r.kernel.org>,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        linux-drm <dri-devel@...ts.freedesktop.org>,
        linux-devicetree <devicetree@...r.kernel.org>,
        Jyri Sarha <jsarha@...com>, David Airlie <airlied@...ux.ie>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH] ARM: dts: da850: specify max width for display node

On 22/11/16 11:42, Bartosz Golaszewski wrote:
> It has been determined that the highest resolution supported correctly
> by LCDC rev1 is 800x600 on da850 due to memory bandwidth constraints.
> 
> Set the max_width property in da850.dtsi to 800.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> ---
>  arch/arm/boot/dts/da850.dtsi | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/boot/dts/da850.dtsi b/arch/arm/boot/dts/da850.dtsi
> index 36066fa..0876238 100644
> --- a/arch/arm/boot/dts/da850.dtsi
> +++ b/arch/arm/boot/dts/da850.dtsi
> @@ -441,6 +441,7 @@
>  			compatible = "ti,da850-tilcdc";
>  			reg = <0x213000 0x1000>;
>  			interrupts = <52>;
> +			max-width = <800>;
>  			status = "disabled";
>  		};
>  	};
> 

Does 1024x768@10 work?

The max-width should be the hardware's maximum supported width, not used
for bandwidth. tilcdc has max-bandwidth property for that.

 Tomi



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