linux-kernel - Re: [PATCH v2 04/12] drm/rockchip: vop2: clear afbc en and transform bit for cluster window at linear mode

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Message-ID: <4e356146-979f-4c30-a230-a0c95c518738@rock-chips.com>
Date:   Tue, 28 Nov 2023 17:44:19 +0800
From:   Andy Yan <andy.yan@...k-chips.com>
To:     Heiko Stübner <heiko@...ech.de>,
        Andy Yan <andyshrk@....com>
Cc:     hjc@...k-chips.com, dri-devel@...ts.freedesktop.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        krzysztof.kozlowski+dt@...aro.org, robh+dt@...nel.org,
        devicetree@...r.kernel.org, sebastian.reichel@...labora.com,
        kever.yang@...k-chips.com, chris.obbard@...labora.com,
        s.hauer@...gutronix.de
Subject: Re: [PATCH v2 04/12] drm/rockchip: vop2: clear afbc en and transform
 bit for cluster window at linear mode

Hi Heiko:

On 11/28/23 16:30, Heiko Stübner wrote:
> Am Dienstag, 28. November 2023, 09:03:46 CET schrieb Andy Yan:
>> Hi Heiko:
>>
>> On 11/27/23 23:02, Heiko Stübner wrote:
>>> Am Mittwoch, 22. November 2023, 13:54:25 CET schrieb Andy Yan:
>>>> From: Andy Yan <andy.yan@...k-chips.com>
>>>>
>>>> The enable bit and transform offset of cluster windows should be
>>>> cleared when it work at linear mode, or we may have a iommu fault
>>>> issue.
>>>>
>>>> Signed-off-by: Andy Yan <andy.yan@...k-chips.com>
>>> I guess same here?
>>>
>>> Fixes: 604be85547ce ("drm/rockchip: Add VOP2 driver")
>>
>> I'm not sure if we need a Fixes tag here,  in fact this issue never happens on
>>
>> rk3566/8 , because the cluster windows of rk356x only support afbc format,
>>
>> they don't have a chance to switch between afbc and linear mode.
>>
>> Of course, the lack support of linear mode of rk356x cluster windows is a thoughtless
>>
>> of IC design, if it really support both afbc and linear format, we indeed need this fix.
>>
>> The situation is the same as patch 03/12.
>>
>> So I hope follow your advice, if it need a Fixes tag here.
> ah ok, thanks for the explanation. Then I guess we don't need a fixes tag
> when the rk3568 is not affected by this.
>
> Same for the other patch. If you're re-sending you could add this information
> to the commit message though. (existing support for rk3568 only supports
> afbc cluster windows and is therefore not affected)

Ok, will done.

>
>
> Thanks
> Heiko
>
>
>
> _______________________________________________
> Linux-rockchip mailing list
> Linux-rockchip@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-rockchip

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