linux-kernel - [PATCH v2 0/1] enable cache for mt8186 SCP

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Message-ID: <20220701121229.22756-1-allen-kh.cheng@mediatek.com>
Date:   Fri, 1 Jul 2022 20:12:28 +0800
From:   Allen-KH Cheng <allen-kh.cheng@...iatek.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        "Matthias Brugger" <matthias.bgg@...il.com>
CC:     <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-remoteproc@...r.kernel.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Allen-KH Cheng <allen-kh.cheng@...iatek.com>
Subject: [PATCH v2 0/1] enable cache for mt8186 SCP

This patch is based on kernel/git/next/linux-next.git/#master and for
enableing cache in SCP.

In mt8186 SCP, it provides parts of these features vedio encode/decode,
camera, and CrOS EC host command. We don't have enough SRAM to support
too many text segments, heap and stack, so SCP will use DRAM as execution
space.·

The DRAM power and latency is much larger than SRAM. cache is used to
mitigate the negative effects for performace. Also it's designed in SCP
bus architecture and does not affect implemenations where the application
processor is using caches.

We reserve 0x3C000 <-> 0x40000 in SRAM(SCP) to support cache and set
I-cache and D-cache size before loading SCP FW. If there isn't no this
patch, SCP still works with DRAM and SRAM.

This driver was tested on mt8186 with below firmware

This driver was tested on mt8186 with below firmware
https://lore.kernel.org/linux-firmware/10ed0b2a78baa88f7fd1d466036c98de2f6d8e29.camel@mediatek.com/T/#t

changes since v1:
 - rebase to linux-next
 - add more information in commit message

Allen-KH Cheng (1):
  remoteproc: mediatek: enable cache for mt8186 SCP

 drivers/remoteproc/mtk_scp.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

-- 
2.18.0