linux-kernel - Re: [PATCH v3 05/12] drm/bridge: ti-sn65dsi86: Move drm_panel_unprepare() to post

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Message-ID: <YGpgqJjpBPQ5//li@pendragon.ideasonboard.com>
Date:   Mon, 5 Apr 2021 03:58:16 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Sam Ravnborg <sam@...nborg.org>,
        Linus W <linus.walleij@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        robdclark@...omium.org, Stephen Boyd <swboyd@...omium.org>,
        Steev Klimaszewski <steev@...i.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        linux-arm-msm@...r.kernel.org,
        Stanislav Lisovskiy <stanislav.lisovskiy@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Robert Foss <robert.foss@...aro.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 05/12] drm/bridge: ti-sn65dsi86: Move
 drm_panel_unprepare() to post_disable()

Hi Doug,

Thank you for the patch.

On Fri, Apr 02, 2021 at 03:28:39PM -0700, Douglas Anderson wrote:
> 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>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
> 
> (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 c006678c9921..e30460002c48 100644
> --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> @@ -452,8 +452,6 @@ 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)
> @@ -869,6 +867,8 @@ 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);

-- 
Regards,

Laurent Pinchart