linux-kernel - Re: [PATCH 1/1] arm64: dts: marvell: mcbin: enlarge PCI memory window

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Date:   Fri, 17 May 2019 22:08:00 +0200
From:   Gregory CLEMENT <gregory.clement@...tlin.com>
To:     Heinrich Schuchardt <xypron.glpk@....de>,
        Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Russell King <linux@...linux.org.uk>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Heinrich Schuchardt <xypron.glpk@....de>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 1/1] arm64: dts: marvell: mcbin: enlarge PCI memory window

Hi Heinrich Schuchardt,

> Running a graphics adapter on the MACCHIATObin fails due to an
> insufficently sized memory window.
I think "insufficient" is enough or I miss something.

>
> Enlarge the memory window for the PCIe slot to 512 MiB.
>
> With the patch I am able to use a GT710 graphics adapter with 1 GB onboard
> memory.
>
> These are the mapped memory areas that the graphics adapter is actually
> using:
>
> Region 0: Memory at cc000000 (32-bit, non-prefetchable) [size=16M]
> Region 1: Memory at c0000000 (64-bit, prefetchable) [size=128M]
> Region 3: Memory at c8000000 (64-bit, prefetchable) [size=32M]
> Region 5: I/O ports at 1000 [size=128]
> Expansion ROM at ca000000 [disabled] [size=512K]

>From my point of view this patch is correct, I don't think it is a
problem to map more memory. So I applied on it mvebu/dt64.

But I add also Thomas in CC who know better the PCIe support on mvebu/

Thanks,

Gregory


>
> Signed-off-by: Heinrich Schuchardt <xypron.glpk@....de>
> ---
>  arch/arm64/boot/dts/marvell/armada-8040-mcbin.dtsi | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/marvell/armada-8040-mcbin.dtsi b/arch/arm64/boot/dts/marvell/armada-8040-mcbin.dtsi
> index 329f8ceeebea..205071b45a32 100644
> --- a/arch/arm64/boot/dts/marvell/armada-8040-mcbin.dtsi
> +++ b/arch/arm64/boot/dts/marvell/armada-8040-mcbin.dtsi
> @@ -184,6 +184,8 @@
>  	num-lanes = <4>;
>  	num-viewport = <8>;
>  	reset-gpios = <&cp0_gpio2 20 GPIO_ACTIVE_LOW>;
> +	ranges = <0x81000000 0x0 0xf9010000 0x0 0xf9010000 0x0 0x10000
> +		  0x82000000 0x0 0xc0000000 0x0 0xc0000000 0x0 0x20000000>;
>  	status = "okay";
>  };
>
> --
> 2.20.1
>

-- 
Gregory Clement, Bootlin
Embedded Linux and Kernel engineering
http://bootlin.com