linux-kernel - Re: [PATCH 6/6] arm64: dts: qcom: sdm845-db845c-navigation-mezzanine: Add cma heap for libcamera softisp support

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Message-ID: <787ae421-0df0-45ae-bc3f-762ad73b8216@linaro.org>
Date: Sat, 2 Nov 2024 11:38:43 +0000
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Kieran Bingham <kieran.bingham@...asonboard.com>,
 Rob Clark <robdclark@...il.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Depeng Shao <quic_depengs@...cinc.com>,
 Vikram Sharma <quic_vikramsa@...cinc.com>,
 Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH 6/6] arm64: dts: qcom: sdm845-db845c-navigation-mezzanine:
 Add cma heap for libcamera softisp support

On 01/11/2024 15:18, Kieran Bingham wrote:
> Presently with SoftISP being CPU only - physically contiguous memory is
> not required.

Yes, I've misinterpreted what we discussed, udmabuf should be enough on 
qcom.

> Bryan, will this still be true when you have a GPU based ISP ? Will that
> require physically contiguous memory ? Or will the mapping into the GPU
> handle any required translations?

I believe it should be fine because we do glTexImage2D on the way in ATM 
and have support for eglCreateImageKHR(.., .., .., .., .., 
   EGL_DMA_BUF_PLANE0_FD_EXT, dma_fd); but in either case phys contig 
doesn't matter.

---
bod