Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Wed, 1 Jul 2020 18:04:18 +0200
From:   Guido =?iso-8859-1?Q?G=FCnther?= <guido.gunther@puri.sm>
To:     Ondrej Jirman <megous@megous.com>
Cc:     linux-sunxi@googlegroups.com,
        Thierry Reding <thierry.reding@gmail.com>,
        Sam Ravnborg <sam@ravnborg.org>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Purism Kernel Team <kernel@puri.sm>,
        Rob Herring <robh+dt@kernel.org>,
        Maxime Ripard <mripard@kernel.org>,
        Chen-Yu Tsai <wens@csie.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Icenowy Zheng <icenowy@aosc.io>,
        dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        Samuel Holland <samuel@sholland.org>,
        Martijn Braam <martijn@brixit.nl>, Luca Weiss <luca@z3ntu.xyz>,
        Bhushan Shah <bshah@kde.org>
Subject: Re: [PATCH v6 10/13] drm/panel: st7703: Enter sleep after display off
Message-ID: <20200701160418.GI174356@bogon.m.sigxcpu.org>
References: <20200701103126.1512615-1-megous@megous.com>
 <20200701103126.1512615-11-megous@megous.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <20200701103126.1512615-11-megous@megous.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Hi,
On Wed, Jul 01, 2020 at 12:31:23PM +0200, Ondrej Jirman wrote:
> The datasheet suggests to issue sleep in after display off
> as a part of the panel's shutdown sequence.

Out of curiosity: which exact datasheet did you use?

Reviewed-by: Guido G?nther <agx@sigxcpu.org> 

> 
> Signed-off-by: Ondrej Jirman <megous@megous.com>
> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
> ---
>  drivers/gpu/drm/panel/panel-sitronix-st7703.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7703.c b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> index 5cd5503f894f..0c4167994d01 100644
> --- a/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> +++ b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> @@ -395,8 +395,19 @@ static int st7703_disable(struct drm_panel *panel)
>  {
>  	struct st7703 *ctx = panel_to_st7703(panel);
>  	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> +	int ret;
> +
> +	ret = mipi_dsi_dcs_set_display_off(dsi);
> +	if (ret < 0)
> +		DRM_DEV_ERROR(ctx->dev,
> +			      "Failed to turn off the display: %d\n", ret);
>  
> -	return mipi_dsi_dcs_set_display_off(dsi);
> +	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
> +	if (ret < 0)
> +		DRM_DEV_ERROR(ctx->dev,
> +			      "Failed to enter sleep mode: %d\n", ret);
> +
> +	return 0;
>  }
>  
>  static int st7703_unprepare(struct drm_panel *panel)
> -- 
> 2.27.0
>