linux-kernel - Re: [PATCH v6 06/13] drm/panel: st7703: Prepare for supporting multiple panels

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Message-ID: <20200701160201.GE174356@bogon.m.sigxcpu.org>
Date:   Wed, 1 Jul 2020 18:02:01 +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 06/13] drm/panel: st7703: Prepare for supporting
 multiple panels

Hi,
On Wed, Jul 01, 2020 at 12:31:19PM +0200, Ondrej Jirman wrote:
> Parametrize the driver so that it can support more panels based
> on st7703 controller.

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 | 43 +++++++++++++------
>  1 file changed, 31 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7703.c b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> index 511af659f273..08cbc316266c 100644
> --- a/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> +++ b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> @@ -13,6 +13,7 @@
>  #include <linux/media-bus-format.h>
>  #include <linux/mod_devicetable.h>
>  #include <linux/module.h>
> +#include <linux/of_device.h>
>  #include <linux/regulator/consumer.h>
>  
>  #include <video/display_timing.h>
> @@ -56,6 +57,15 @@ struct st7703 {
>  	bool prepared;
>  
>  	struct dentry *debugfs;
> +	const struct st7703_panel_desc *desc;
> +};
> +
> +struct st7703_panel_desc {
> +	const struct drm_display_mode *mode;
> +	unsigned int lanes;
> +	unsigned long mode_flags;
> +	enum mipi_dsi_pixel_format format;
> +	int (*init_sequence)(struct st7703 *ctx);
>  };
>  
>  static inline struct st7703 *panel_to_st7703(struct drm_panel *panel)
> @@ -148,7 +158,7 @@ static int st7703_enable(struct drm_panel *panel)
>  	struct st7703 *ctx = panel_to_st7703(panel);
>  	int ret;
>  
> -	ret = jh057n_init_sequence(ctx);
> +	ret = ctx->desc->init_sequence(ctx);
>  	if (ret < 0) {
>  		DRM_DEV_ERROR(ctx->dev, "Panel init sequence failed: %d\n",
>  			      ret);
> @@ -216,7 +226,7 @@ static int st7703_prepare(struct drm_panel *panel)
>  	return ret;
>  }
>  
> -static const struct drm_display_mode default_mode = {
> +static const struct drm_display_mode jh057n00900_mode = {
>  	.hdisplay    = 720,
>  	.hsync_start = 720 + 90,
>  	.hsync_end   = 720 + 90 + 20,
> @@ -232,17 +242,26 @@ static const struct drm_display_mode default_mode = {
>  	.height_mm   = 130,
>  };
>  
> +struct st7703_panel_desc jh057n00900_panel_desc = {
> +	.mode = &jh057n00900_mode,
> +	.lanes = 4,
> +	.mode_flags = MIPI_DSI_MODE_VIDEO |
> +		MIPI_DSI_MODE_VIDEO_BURST | MIPI_DSI_MODE_VIDEO_SYNC_PULSE,
> +	.format = MIPI_DSI_FMT_RGB888,
> +	.init_sequence = jh057n_init_sequence,
> +};
> +
>  static int st7703_get_modes(struct drm_panel *panel,
>  			    struct drm_connector *connector)
>  {
>  	struct st7703 *ctx = panel_to_st7703(panel);
>  	struct drm_display_mode *mode;
>  
> -	mode = drm_mode_duplicate(connector->dev, &default_mode);
> +	mode = drm_mode_duplicate(connector->dev, ctx->desc->mode);
>  	if (!mode) {
>  		DRM_DEV_ERROR(ctx->dev, "Failed to add mode %ux%u@%u\n",
> -			      default_mode.hdisplay, default_mode.vdisplay,
> -			      default_mode.vrefresh);
> +			      ctx->desc->mode->hdisplay, ctx->desc->mode->vdisplay,
> +			      ctx->desc->mode->vrefresh);
>  		return -ENOMEM;
>  	}
>  
> @@ -317,11 +336,11 @@ static int st7703_probe(struct mipi_dsi_device *dsi)
>  	mipi_dsi_set_drvdata(dsi, ctx);
>  
>  	ctx->dev = dev;
> +	ctx->desc = of_device_get_match_data(dev);
>  
> -	dsi->lanes = 4;
> -	dsi->format = MIPI_DSI_FMT_RGB888;
> -	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
> -		MIPI_DSI_MODE_VIDEO_BURST | MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
> +	dsi->mode_flags = ctx->desc->mode_flags;
> +	dsi->format = ctx->desc->format;
> +	dsi->lanes = ctx->desc->lanes;
>  
>  	ctx->vcc = devm_regulator_get(dev, "vcc");
>  	if (IS_ERR(ctx->vcc)) {
> @@ -361,8 +380,8 @@ static int st7703_probe(struct mipi_dsi_device *dsi)
>  	}
>  
>  	DRM_DEV_INFO(dev, "%ux%u@%u %ubpp dsi %udl - ready\n",
> -		     default_mode.hdisplay, default_mode.vdisplay,
> -		     default_mode.vrefresh,
> +		     ctx->desc->mode->hdisplay, ctx->desc->mode->vdisplay,
> +		     ctx->desc->mode->vrefresh,
>  		     mipi_dsi_pixel_format_to_bpp(dsi->format), dsi->lanes);
>  
>  	st7703_debugfs_init(ctx);
> @@ -405,7 +424,7 @@ static int st7703_remove(struct mipi_dsi_device *dsi)
>  }
>  
>  static const struct of_device_id st7703_of_match[] = {
> -	{ .compatible = "rocktech,jh057n00900" },
> +	{ .compatible = "rocktech,jh057n00900", .data = &jh057n00900_panel_desc },
>  	{ /* sentinel */ }
>  };
>  MODULE_DEVICE_TABLE(of, st7703_of_match);
> -- 
> 2.27.0
>