linux-kernel - Re: [PATCH v17 11/21] drm/mediatek: add display merge start/stop API for cmdq support

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Message-ID: <7faa6c9a-9ace-d1eb-0bca-8e8d7c3ae7ec@gmail.com>
Date:   Mon, 25 Apr 2022 17:27:27 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Chun-Kuang Hu <chunkuang.hu@...nel.org>
Cc:     "Nancy.Lin" <nancy.lin@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>, wim@...ux-watchdog.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, linux@...ck-us.net,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "jason-jh . lin" <jason-jh.lin@...iatek.com>,
        Yongqiang Niu <yongqiang.niu@...iatek.com>,
        DTML <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        llvm@...ts.linux.dev, singo.chang@...iatek.com,
        srv_heupstream <srv_heupstream@...iatek.com>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v17 11/21] drm/mediatek: add display merge start/stop API
 for cmdq support



On 25/04/2022 15:32, Chun-Kuang Hu wrote:
> Hi, Matthias:
> 
> Matthias Brugger <matthias.bgg@...il.com> 於 2022年4月22日 週五 下午7:48寫道：
>>
>>
>>
>> On 16/04/2022 04:07, Nancy.Lin wrote:
>>> Add merge start/stop API for cmdq support. The ovl_adaptor merges
>>> are configured with each drm plane update. Need to enable/disable
>>> merge with cmdq making sure all the settings taken effect in the
>>> same vblank.
>>>
>>> Signed-off-by: Nancy.Lin <nancy.lin@...iatek.com>
>>> Reviewed-by: Chun-Kuang Hu <chunkuang.hu@...nel.org>
>>> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
>>> ---
>>>    drivers/gpu/drm/mediatek/mtk_disp_drv.h   |  2 ++
>>>    drivers/gpu/drm/mediatek/mtk_disp_merge.c | 20 +++++++++++++++++---
>>>    2 files changed, 19 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
>>> index 53aa988dde3b..43a412525b75 100644
>>> --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
>>> +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
>>> @@ -66,6 +66,8 @@ void mtk_merge_stop(struct device *dev);
>>>    void mtk_merge_advance_config(struct device *dev, unsigned int l_w, unsigned int r_w,
>>>                              unsigned int h, unsigned int vrefresh, unsigned int bpc,
>>>                              struct cmdq_pkt *cmdq_pkt);
>>> +void mtk_merge_start_cmdq(struct device *dev, struct cmdq_pkt *cmdq_pkt);
>>> +void mtk_merge_stop_cmdq(struct device *dev, struct cmdq_pkt *cmdq_pkt);
>>>
>>>    void mtk_ovl_bgclr_in_on(struct device *dev);
>>>    void mtk_ovl_bgclr_in_off(struct device *dev);
>>> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_merge.c b/drivers/gpu/drm/mediatek/mtk_disp_merge.c
>>> index 40da0555416d..c0d9b43b2a66 100644
>>> --- a/drivers/gpu/drm/mediatek/mtk_disp_merge.c
>>> +++ b/drivers/gpu/drm/mediatek/mtk_disp_merge.c
>>> @@ -67,17 +67,31 @@ struct mtk_disp_merge {
>>>    };
>>>
>>>    void mtk_merge_start(struct device *dev)
>>
>> Probably not my call, but wouldn't it make sense to enhance mtk_merge_start to
>> pass 'struct cmdq_pkt *cmdq_pkt' directly instead of adding this 'adapter'?
> 
> In [1], mtk_merge_start() should match the function prototype of
> mtk_ddp_comp_funcs.start, so keep the non-cmdq interface.

Well other callbacks, namely config hass cmdq_pkt. So we could change the 
callback in a similar way is was done in
d0afe37f5209 ("drm/mediatek: support CMDQ interface in ddp component")


But as i said it's up to you. You are the maintainer.

Regards,
Matthias

> 
> static const struct mtk_ddp_comp_funcs ddp_merge = {
>   .clk_enable = mtk_merge_clk_enable,
>   .clk_disable = mtk_merge_clk_disable,
>   .start = mtk_merge_start,
>   .stop = mtk_merge_stop,
>   .config = mtk_merge_config,
> };
> 
> [1] https://patchwork.kernel.org/project/linux-mediatek/patch/20220419094143.9561-5-jason-jh.lin@mediatek.com/
> 
> Regards,
> Chun-Kuang.
> 
>>
>> In the end this is up to Chun-Kuang.
>>
>> Regards,
>> Matthias
>>
>>> +{
>>> +     mtk_merge_start_cmdq(dev, NULL);
>>> +}
>>> +
>>> +void mtk_merge_stop(struct device *dev)
>>>    {
>>>        struct mtk_disp_merge *priv = dev_get_drvdata(dev);
>>>
>>> -     writel(MERGE_EN, priv->regs + DISP_REG_MERGE_CTRL);
>>> +     mtk_merge_stop_cmdq(dev, NULL);
>>>    }
>>>
>>> -void mtk_merge_stop(struct device *dev)
>>> +void mtk_merge_start_cmdq(struct device *dev, struct cmdq_pkt *cmdq_pkt)
>>> +{
>>> +     struct mtk_disp_merge *priv = dev_get_drvdata(dev);
>>> +
>>> +     mtk_ddp_write(cmdq_pkt, 1, &priv->cmdq_reg, priv->regs,
>>> +                   DISP_REG_MERGE_CTRL);
>>> +}
>>> +
>>> +void mtk_merge_stop_cmdq(struct device *dev, struct cmdq_pkt *cmdq_pkt)
>>>    {
>>>        struct mtk_disp_merge *priv = dev_get_drvdata(dev);
>>>
>>> -     writel(0x0, priv->regs + DISP_REG_MERGE_CTRL);
>>> +     mtk_ddp_write(cmdq_pkt, 0, &priv->cmdq_reg, priv->regs,
>>> +                   DISP_REG_MERGE_CTRL);
>>>    }
>>>
>>>    static void mtk_merge_fifo_setting(struct mtk_disp_merge *priv,