linux-kernel - Re: [PATCH] drm/mediatek: dsi: Add atomic {destroy,duplicate}

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Date:   Wed, 10 Aug 2022 17:15:14 -0400
From:   Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     chunkuang.hu@...nel.org, p.zabel@...gutronix.de, airlied@...ux.ie,
        daniel@...ll.ch, matthias.bgg@...il.com, rex-bc.chen@...iatek.com,
        jitao.shi@...iatek.com, xinlei.lee@...iatek.com,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/mediatek: dsi: Add atomic {destroy,duplicate}_state,
 reset callbacks

On Thu, Jul 21, 2022 at 07:27:27PM +0200, AngeloGioacchino Del Regno wrote:
> Add callbacks for atomic_destroy_state, atomic_duplicate_state and
> atomic_reset to restore functionality of the DSI driver: this solves
> vblank timeouts when another bridge is present in the chain.
> 
> Tested bridge chain: DSI <=> ANX7625 => aux-bus panel
> 
> Fixes: 7f6335c6a258 ("drm/mediatek: Modify dsi funcs to atomic operations")
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>

Reviewed-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
Tested-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>

Tested on mt8183-jacuzzi-juniper. As part of enabling IGT tests on that machine
in KernelCI, this regression needs to be fixed. [1]

Thanks,
Nícolas

[1] https://github.com/kernelci/kernelci-core/pull/1059

> ---
> 
> Note: The commit that has been mentioned in the Fixes tag should
>       *not* have my Reviewed-by tag, as the author changed it but
>       erroneously retained the tag that I had released for an
>       earlier version of that commit (which was fine, but the new
>       version broke mtk_dsi!).
> 
>  drivers/gpu/drm/mediatek/mtk_dsi.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 9cc406e1eee1..5b624e0f5b0a 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -808,10 +808,13 @@ static void mtk_dsi_bridge_atomic_post_disable(struct drm_bridge *bridge,
>  
>  static const struct drm_bridge_funcs mtk_dsi_bridge_funcs = {
>  	.attach = mtk_dsi_bridge_attach,
> +	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
>  	.atomic_disable = mtk_dsi_bridge_atomic_disable,
> +	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
>  	.atomic_enable = mtk_dsi_bridge_atomic_enable,
>  	.atomic_pre_enable = mtk_dsi_bridge_atomic_pre_enable,
>  	.atomic_post_disable = mtk_dsi_bridge_atomic_post_disable,
> +	.atomic_reset = drm_atomic_helper_bridge_reset,
>  	.mode_set = mtk_dsi_bridge_mode_set,
>  };
>  
> -- 
> 2.35.1
> 
>