linux-kernel - Re: [PATCH v2 06/14] drm/bridge: ti-sn65dsi86: Move drm_panel_unprepare() to post

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Message-ID: <e1caa468-0998-cddb-938a-06785c381ba0@samsung.com>
Date:   Wed, 31 Mar 2021 11:54:59 +0200
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Douglas Anderson <dianders@...omium.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Sam Ravnborg <sam@...nborg.org>
Cc:     robdclark@...omium.org, dri-devel@...ts.freedesktop.org,
        David Airlie <airlied@...ux.ie>, linux-arm-msm@...r.kernel.org,
        Steev Klimaszewski <steev@...i.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Stanislav Lisovskiy <stanislav.lisovskiy@...el.com>,
        Robert Foss <robert.foss@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 06/14] drm/bridge: ti-sn65dsi86: Move
 drm_panel_unprepare() to post_disable()


W dniu 30.03.2021 o 04:53, Douglas Anderson pisze:
> We prepared the panel in pre_enable() so we should unprepare it in
> post_disable() to match.
>
> This becomes important once we start using pre_enable() and
> post_disable() to make sure things are powered on (and then off again)
> when reading the EDID.
>
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
Reviewed-by: Andrzej Hajda <a.hajda@...sung.com>

Regards
Andrzej
> ---
>
> (no changes since v1)
>
>   drivers/gpu/drm/bridge/ti-sn65dsi86.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> index e8e523b3a16b..50a52af8e39f 100644
> --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> @@ -460,8 +460,6 @@ static void ti_sn_bridge_disable(struct drm_bridge *bridge)
>   	regmap_write(pdata->regmap, SN_ML_TX_MODE_REG, 0);
>   	/* disable DP PLL */
>   	regmap_write(pdata->regmap, SN_PLL_ENABLE_REG, 0);
> -
> -	drm_panel_unprepare(pdata->panel);
>   }
>   
>   static u32 ti_sn_bridge_get_dsi_freq(struct ti_sn_bridge *pdata)
> @@ -877,6 +875,8 @@ static void ti_sn_bridge_post_disable(struct drm_bridge *bridge)
>   {
>   	struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
>   
> +	drm_panel_unprepare(pdata->panel);
> +
>   	clk_disable_unprepare(pdata->refclk);
>   
>   	pm_runtime_put_sync(pdata->dev);