linux-kernel - Re: [PATCH] drm/bridge: nwl-dsi: Fix PM disable depth imbalance in nwl_dsi

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Message-ID: <CAG3jFyvUcGgELW=N4OXwU_SVtV9YpyKQynTj2Oz77P_C1YMOkg@mail.gmail.com>
Date:   Wed, 5 Jan 2022 18:51:07 +0100
From:   Robert Foss <robert.foss@...aro.org>
To:     Miaoqian Lin <linmq006@...il.com>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Fabio Estevam <festevam@...il.com>,
        Guido Günther <agx@...xcpu.org>,
        Robert Chiras <robert.chiras@....com>,
        Sam Ravnborg <sam@...nborg.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: nwl-dsi: Fix PM disable depth imbalance in nwl_dsi_probe

Hey Miaoqian,

Thanks for submitting this patch!

On Wed, 5 Jan 2022 at 11:48, Miaoqian Lin <linmq006@...il.com> wrote:
>
> The pm_runtime_enable will increase power disable depth.
> Thus a pairing decrement is needed on the error handling
> path to keep it balanced according to context.
>
> Fixes: 44cfc62 ("drm/bridge: Add NWL MIPI DSI host controller support")

In the future, please use 12 chars of the hash. I'll fix it this time,
but please use 12 characters going forward.

> Signed-off-by: Miaoqian Lin <linmq006@...il.com>
> ---
>  drivers/gpu/drm/bridge/nwl-dsi.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
> index a7389a0facfb..fc3ad9fab867 100644
> --- a/drivers/gpu/drm/bridge/nwl-dsi.c
> +++ b/drivers/gpu/drm/bridge/nwl-dsi.c
> @@ -1206,6 +1206,7 @@ static int nwl_dsi_probe(struct platform_device *pdev)
>
>         ret = nwl_dsi_select_input(dsi);
>         if (ret < 0) {
> +               pm_runtime_disable(dev);
>                 mipi_dsi_host_unregister(&dsi->dsi_host);
>                 return ret;
>         }
> --
> 2.17.1
>

Fixed commit hash length, added my r-b and applied to drm-misc-next.

Reviewed-by: Robert Foss <robert.foss@...aro.org>