linux-kernel - Re: [PATCH v3 1/2] ARM: dts: bcm2711: force CMA into first GB of memory

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Message-ID: <4f82d3b5-fe5e-03a5-220e-f1431cb3a50c@gmail.com>
Date:   Thu, 7 Nov 2019 09:59:04 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Eric Anholt <eric@...olt.net>,
        Stefan Wahren <wahrenst@....net>, devicetree@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 1/2] ARM: dts: bcm2711: force CMA into first GB of
 memory

On 11/7/19 3:20 AM, Catalin Marinas wrote:
> Hi Nicolas,
> 
> On Thu, Nov 07, 2019 at 10:56:10AM +0100, Nicolas Saenz Julienne wrote:
>> diff --git a/arch/arm/boot/dts/bcm2711.dtsi b/arch/arm/boot/dts/bcm2711.dtsi
>> index ac83dac2e6ba..667658497898 100644
>> --- a/arch/arm/boot/dts/bcm2711.dtsi
>> +++ b/arch/arm/boot/dts/bcm2711.dtsi
>> @@ -12,6 +12,26 @@
>>  
>>  	interrupt-parent = <&gicv2>;
>>  
>> +	reserved-memory {
>> +		#address-cells = <2>;
>> +		#size-cells = <1>;
>> +		ranges;
>> +
>> +		/*
>> +		 * arm64 reserves the CMA by default somewhere in ZONE_DMA32,
>> +		 * that's not good enough for bcm2711 as some devices can
>> +		 * only address the lower 1G of memory (ZONE_DMA).
>> +		 */
>> +		linux,cma {
>> +			compatible = "shared-dma-pool";
>> +			size = <0x2000000>; /* 32MB */
>> +			alloc-ranges = <0x0 0x00000000 0x40000000>;
>> +			reusable;
>> +			linux,cma-default;
>> +		};
>> +	};
>> +
>> +
>>  	soc {
>>  		/*
>>  		 * Defined ranges:
> 
> Sorry, I just realised I can't merge this as it depends on a patch
> that's only in -next: 7dbe8c62ceeb ("ARM: dts: Add minimal Raspberry Pi
> 4 support").
> 
> I'll queue the second patch in the series to fix the regression
> introduces by the ZONE_DMA patches and, AFAICT, the dts update can be
> queued independently.

I will take it directly, unless you have more stuff coming Stefan?
-- 
Florian