linux-kernel - Re: [PATCH 1/2] drm/bridge: ps8640: Skip redundant bridge enable

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAN6tsi7d9XPfQmp+uSjbsgS3YeLJF_Ozp4ZjoaVOF2oWJQgLtw@mail.gmail.com>
Date:   Tue, 14 Mar 2023 12:19:08 +0100
From:   Robert Foss <rfoss@...nel.org>
To:     Pin-yen Lin <treapking@...omium.org>
Cc:     Douglas Anderson <dianders@...omium.org>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 1/2] drm/bridge: ps8640: Skip redundant bridge enable

On Tue, Mar 14, 2023 at 12:01 PM Pin-yen Lin <treapking@...omium.org> wrote:
>
> Skip the drm_bridge_chain_pre_enable call when the bridge is already
> pre_enabled. This make pre_enable and post_disable (thus
> pm_runtime_get/put) symmetric.
>
> Fixes: 46f206304db0 ("drm/bridge: ps8640: Rework power state handling")
> Signed-off-by: Pin-yen Lin <treapking@...omium.org>
> ---
>
>  drivers/gpu/drm/bridge/parade-ps8640.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
> index 4b361d7d5e44..08de501c436e 100644
> --- a/drivers/gpu/drm/bridge/parade-ps8640.c
> +++ b/drivers/gpu/drm/bridge/parade-ps8640.c
> @@ -557,7 +557,8 @@ static struct edid *ps8640_bridge_get_edid(struct drm_bridge *bridge,
>          * EDID, for this chip, we need to do a full poweron, otherwise it will
>          * fail.
>          */
> -       drm_atomic_bridge_chain_pre_enable(bridge, connector->state->state);
> +       if (poweroff)
> +               drm_atomic_bridge_chain_pre_enable(bridge, connector->state->state);
>
>         edid = drm_get_edid(connector,
>                             ps_bridge->page[PAGE0_DP_CNTL]->adapter);
> --
> 2.40.0.rc1.284.g88254d51c5-goog
>

Reviewed-by: Robert Foss <rfoss@...nel.org>