From: shawnguo@kernel.org (Shawn Guo)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/1] ARM: dts: imx6qdl.dtsi: add "arm, shared-override" for pl310
Date: Sat, 11 Jun 2016 19:57:33 +0800 [thread overview]
Message-ID: <20160611115733.GM20243@tiger> (raw)
In-Reply-To: <1465292365-26038-1-git-send-email-peter.chen@nxp.com>
+ Lucas
On Tue, Jun 07, 2016 at 05:39:25PM +0800, Peter Chen wrote:
> The imx6 SMP system has the same DMA memory coherency issue [1] with
> pl310 L2 controller. With this shared override bit set, the customer
> reports the DMA coherency issue is gone. Besides, I have tested
> the performance using USB ethernet with/without this bit, it shows
> no difference.
>
> [1] http://patchwork.ozlabs.org/patch/469362/
>
> Signed-off-by: Peter Chen <peter.chen@nxp.com>
> ---
> arch/arm/boot/dts/imx6qdl.dtsi | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm/boot/dts/imx6qdl.dtsi b/arch/arm/boot/dts/imx6qdl.dtsi
> index ed613eb..30e21ee 100644
> --- a/arch/arm/boot/dts/imx6qdl.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl.dtsi
> @@ -185,6 +185,7 @@
> cache-level = <2>;
> arm,tag-latency = <4 2 3>;
> arm,data-latency = <4 2 3>;
> + arm,shared-override;
Lucas had an objection to the change [1], considering the case that
kernel is booted as non-secure.
Shawn
[1] http://thread.gmane.org/gmane.linux.ports.arm.kernel/471026
> };
>
> pcie: pcie at 0x01000000 {
> --
> 1.9.1
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2016-06-11 11:57 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-07 9:39 [PATCH 1/1] ARM: dts: imx6qdl.dtsi: add "arm, shared-override" for pl310 Peter Chen
2016-06-11 11:57 ` Shawn Guo [this message]
2016-06-13 9:15 ` Peter Chen
2016-06-13 9:24 ` Lucas Stach
2016-06-13 9:42 ` Peter Chen
2016-06-13 11:14 ` Lucas Stach
2016-06-14 1:30 ` Peter Chen
2016-06-14 10:11 ` Lucas Stach
2016-06-16 1:02 ` Shawn Guo
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