linux-kernel - Re: [PATCH v11 07/22] soc: mediatek: add cmdq support of mtk-mmsys config API for mt8195 vdosys1

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Message-ID: <98929c87-75d2-41a4-6f50-7dbe29aeb1f3@collabora.com>
Date:   Thu, 13 Jan 2022 17:08:21 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     "Nancy.Lin" <nancy.lin@...iatek.com>, CK Hu <ck.hu@...iatek.com>
Cc:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "jason-jh . lin" <jason-jh.lin@...iatek.com>,
        Yongqiang Niu <yongqiang.niu@...iatek.com>,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        singo.chang@...iatek.com, srv_heupstream@...iatek.com
Subject: Re: [PATCH v11 07/22] soc: mediatek: add cmdq support of mtk-mmsys
 config API for mt8195 vdosys1

Il 10/01/22 09:46, Nancy.Lin ha scritto:
> Add cmdq support for mtk-mmsys config API.
> The mmsys config register settings need to take effect with the other
> HW settings(like OVL_ADAPTOR...) at the same vblanking time.
> 
> If we use CPU to write the mmsys reg, we can't guarantee all the
> settings can be written in the same vblanking time.
> Cmdq is used for this purpose. We prepare all the related HW settings
> in one cmdq packet. The first command in the packet is "wait stream done",
> and then following with all the HW settings. After the cmdq packet is
> flush to GCE HW. The GCE waits for the "stream done event" to coming
> and then starts flushing all the HW settings. This can guarantee all
> the settings flush in the same vblanking.
> 
> Signed-off-by: Nancy.Lin <nancy.lin@...iatek.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>