linux-kernel - Re: [PATCH v6 08/13] drm/panel: st7703: Move generic part of init sequence to enable callback

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Date:   Wed, 1 Jul 2020 18:02:47 +0200
From:   Guido Günther <guido.gunther@...i.sm>
To:     Ondrej Jirman <megous@...ous.com>
Cc:     linux-sunxi@...glegroups.com,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Purism Kernel Team <kernel@...i.sm>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Icenowy Zheng <icenowy@...c.io>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Samuel Holland <samuel@...lland.org>,
        Martijn Braam <martijn@...xit.nl>, Luca Weiss <luca@...tu.xyz>,
        Bhushan Shah <bshah@....org>
Subject: Re: [PATCH v6 08/13] drm/panel: st7703: Move generic part of init
 sequence to enable callback

Hi,
On Wed, Jul 01, 2020 at 12:31:21PM +0200, Ondrej Jirman wrote:
> Calling sleep out and display on is a controller specific part
> of the initialization process. Move it out of the panel specific
> initialization function to the enable callback.

Reviewed-by: Guido Günther <agx@...xcpu.org> 

> 
> Signed-off-by: Ondrej Jirman <megous@...ous.com>
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
> ---
>  drivers/gpu/drm/panel/panel-sitronix-st7703.c | 33 ++++++++++---------
>  1 file changed, 18 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7703.c b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> index d03aab10cfef..cdbf7dfb4dd4 100644
> --- a/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> +++ b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> @@ -84,8 +84,6 @@ static inline struct st7703 *panel_to_st7703(struct drm_panel *panel)
>  static int jh057n_init_sequence(struct st7703 *ctx)
>  {
>  	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> -	struct device *dev = ctx->dev;
> -	int ret;
>  
>  	/*
>  	 * Init sequence was supplied by the panel vendor. Most of the commands
> @@ -136,20 +134,7 @@ static int jh057n_init_sequence(struct st7703 *ctx)
>  			      0x18, 0x00, 0x09, 0x0E, 0x29, 0x2D, 0x3C, 0x41,
>  			      0x37, 0x07, 0x0B, 0x0D, 0x10, 0x11, 0x0F, 0x10,
>  			      0x11, 0x18);
> -	msleep(20);
> -
> -	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
> -	if (ret < 0) {
> -		DRM_DEV_ERROR(dev, "Failed to exit sleep mode: %d\n", ret);
> -		return ret;
> -	}
> -	/* Panel is operational 120 msec after reset */
> -	msleep(60);
> -	ret = mipi_dsi_dcs_set_display_on(dsi);
> -	if (ret)
> -		return ret;
>  
> -	DRM_DEV_DEBUG_DRIVER(dev, "Panel init sequence done\n");
>  	return 0;
>  }
>  
> @@ -181,6 +166,7 @@ struct st7703_panel_desc jh057n00900_panel_desc = {
>  static int st7703_enable(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 = ctx->desc->init_sequence(ctx);
> @@ -190,6 +176,23 @@ static int st7703_enable(struct drm_panel *panel)
>  		return ret;
>  	}
>  
> +	msleep(20);
> +
> +	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
> +	if (ret < 0) {
> +		DRM_DEV_ERROR(ctx->dev, "Failed to exit sleep mode: %d\n", ret);
> +		return ret;
> +	}
> +
> +	/* Panel is operational 120 msec after reset */
> +	msleep(60);
> +
> +	ret = mipi_dsi_dcs_set_display_on(dsi);
> +	if (ret)
> +		return ret;
> +
> +	DRM_DEV_DEBUG_DRIVER(ctx->dev, "Panel init sequence done\n");
> +
>  	return 0;
>  }
>  
> -- 
> 2.27.0
>