linux-kernel - Re: [PATCH] arm64: dts: qcom: sa8775p: Mark APPS and PCIE SMMUs as DMA coherent

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Message-ID: <nulprwjd52j2iq7cpx5nq733cbi6ccdpemq6a7ocglv4ep5jmh@jvs6zof5u535>
Date: Mon, 15 Jul 2024 13:14:32 -0500
From: Andrew Halaney <ahalaney@...hat.com>
To: Qingqing Zhou <quic_qqzhou@...cinc.com>
Cc: andersson@...nel.org, konrad.dybcio@...aro.org, robh@...nel.org, 
	krzk+dt@...nel.org, conor+dt@...nel.org, linux-arm-msm@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: sa8775p: Mark APPS and PCIE SMMUs as
 DMA coherent

On Mon, Jul 15, 2024 at 12:46:49PM GMT, Qingqing Zhou wrote:
> The SMMUs on sa8775p are cache-coherent. GPU SMMU is marked as such,
> mark the APPS and PCIE ones as well.
> 
> Signed-off-by: Qingqing Zhou <quic_qqzhou@...cinc.com>

I think this deserves a Fixes tag as well, not treating it as
dma-coherent is a bug and can lead to difficult to debug errors based on
a quick search through lkml.

Thanks,
Andrew