From mboxrd@z Thu Jan  1 00:00:00 1970
From: Shawn Guo <shawnguo@kernel.org>
Subject: Re: [PATCH v2 07/15] ARM: dts: increase default cma size to 40MB
Date: Thu, 3 May 2018 10:40:12 +0800
Message-ID: <20180503024011.GP3443@dragon>
References: <20180423134750.30403-1-rui.silva@linaro.org>
 <20180423134750.30403-8-rui.silva@linaro.org>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <driverdev-devel-bounces@linuxdriverproject.org>
Content-Disposition: inline
In-Reply-To: <20180423134750.30403-8-rui.silva@linaro.org>
List-Unsubscribe: <http://driverdev.linuxdriverproject.org/mailman/options/driverdev-devel>,
 <mailto:driverdev-devel-request@linuxdriverproject.org?subject=unsubscribe>
List-Archive: <http://driverdev.linuxdriverproject.org/pipermail/driverdev-devel/>
List-Post: <mailto:driverdev-devel@linuxdriverproject.org>
List-Help: <mailto:driverdev-devel-request@linuxdriverproject.org?subject=help>
List-Subscribe: <http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel>,
 <mailto:driverdev-devel-request@linuxdriverproject.org?subject=subscribe>
Errors-To: driverdev-devel-bounces@linuxdriverproject.org
Sender: "devel" <driverdev-devel-bounces@linuxdriverproject.org>
To: Rui Miguel Silva <rui.silva@linaro.org>
Cc: devel@driverdev.osuosl.org, devicetree@vger.kernel.org, sakari.ailus@linux.intel.com, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Ryan Harkin <ryan.harkin@linaro.org>, Rob Herring <robh+dt@kernel.org>, Philipp Zabel <p.zabel@pengutronix.de>, Steve Longerbeam <slongerbeam@gmail.com>, Fabio Estevam <fabio.estevam@nxp.com>, mchehab@kernel.org, linux-media@vger.kernel.org
List-Id: devicetree@vger.kernel.org

On Mon, Apr 23, 2018 at 02:47:42PM +0100, Rui Miguel Silva wrote:
> To support camera in i.MX7 the cma heap is used to allocate frame buffers. The
> default size of CMA is 16MB which is not enough for higher resolutions (ex:
> 1600x1200).
> 
> So, increase the default CMA size to 40MB.
> 
> Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>

CMA size can be adjusted by kernel cmdline.  I'm not sure it's necessary
to make it fixed in DT.

Shawn

> ---
>  arch/arm/boot/dts/imx7s.dtsi | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/imx7s.dtsi b/arch/arm/boot/dts/imx7s.dtsi
> index 4d42335c0dee..142ea709d296 100644
> --- a/arch/arm/boot/dts/imx7s.dtsi
> +++ b/arch/arm/boot/dts/imx7s.dtsi
> @@ -182,6 +182,20 @@
>  			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
>  	};
>  
> +	reserved-memory {
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges;
> +
> +		/* global autoconfigured region for contiguous allocations */
> +		linux,cma {
> +			compatible = "shared-dma-pool";
> +			reusable;
> +			size = <0x2800000>;
> +			linux,cma-default;
> +		};
> +	};
> +
>  	soc {
>  		#address-cells = <1>;
>  		#size-cells = <1>;
> -- 
> 2.17.0
>