linux-kernel - Re: [PATCH v5 1/5] drm/panel: boe-th101mb31ig002 : Make it compatible with other panel.

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Message-ID: <0dd9c497-9d21-4d4e-8165-cab06b38f69a@linaro.org>
Date: Mon, 8 Jul 2024 14:34:52 +0200
From: neil.armstrong@...aro.org
To: Zhaoxiong Lv <lvzhaoxiong@...qin.corp-partner.google.com>,
 robh@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 airlied@...il.com, daniel@...ll.ch, mripard@...nel.org, dianders@...gle.com,
 hsinyi@...gle.com, awarnecke002@...mail.com, quic_jesszhan@...cinc.com,
 dmitry.baryshkov@...aro.org
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/5] drm/panel: boe-th101mb31ig002 : Make it compatible
 with other panel.

On 04/07/2024 09:29, Zhaoxiong Lv wrote:
> This driver currently only applies to one panel. Modify it to be
> compatible with other panels.
> 
> Signed-off-by: Zhaoxiong Lv <lvzhaoxiong@...qin.corp-partner.google.com>
> ---
>   .../drm/panel/panel-boe-th101mb31ig002-28a.c  | 40 +++++++++++++++----
>   1 file changed, 33 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-boe-th101mb31ig002-28a.c b/drivers/gpu/drm/panel/panel-boe-th101mb31ig002-28a.c
> index 763e9f8342d3..159e401ad0e6 100644
> --- a/drivers/gpu/drm/panel/panel-boe-th101mb31ig002-28a.c
> +++ b/drivers/gpu/drm/panel/panel-boe-th101mb31ig002-28a.c
> @@ -17,11 +17,21 @@
>   #include <drm/drm_modes.h>
>   #include <drm/drm_panel.h>
>   
> +struct panel_desc {
> +	const struct drm_display_mode *modes;
> +	unsigned long mode_flags;
> +	enum mipi_dsi_pixel_format format;
> +	const struct panel_init_cmd *init_cmds;
> +	unsigned int lanes;
> +};
> +
>   struct boe_th101mb31ig002 {
>   	struct drm_panel panel;
>   
>   	struct mipi_dsi_device *dsi;
>   
> +	const struct panel_desc *desc;
> +
>   	struct regulator *power;
>   	struct gpio_desc *enable;
>   	struct gpio_desc *reset;
> @@ -161,7 +171,10 @@ static int boe_th101mb31ig002_prepare(struct drm_panel *panel)
>   	gpiod_set_value_cansleep(ctx->enable, 1);
>   	msleep(50);
>   	boe_th101mb31ig002_reset(ctx);
> -	boe_th101mb31ig002_enable(panel);
> +
> +	ret = ctx->desc->init(ctx);
> +	if (ret)
> +		return ret;

There's no ->init in struct panel_desc

>   
>   	return 0;
>   }
> @@ -181,6 +194,16 @@ static const struct drm_display_mode boe_th101mb31ig002_default_mode = {
>   	.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
>   };
>   
> +static const struct panel_desc boe_th101mb31ig002_desc = {
> +	.modes = &boe_th101mb31ig002_default_mode,
> +	.lanes = 4,
> +	.format = MIPI_DSI_FMT_RGB888,
> +	.mode_flags = MIPI_DSI_MODE_VIDEO_BURST |
> +			  MIPI_DSI_MODE_NO_EOT_PACKET |
> +			  MIPI_DSI_MODE_LPM,
> +	.init_cmds = boe_th101mb31ig002_enable,
> +};
> +
>   static int boe_th101mb31ig002_get_modes(struct drm_panel *panel,
>   					struct drm_connector *connector)
>   {
> @@ -237,6 +260,7 @@ static const struct drm_panel_funcs boe_th101mb31ig002_funcs = {
>   static int boe_th101mb31ig002_dsi_probe(struct mipi_dsi_device *dsi)
>   {
>   	struct boe_th101mb31ig002 *ctx;
> +	const struct panel_desc *desc;
>   	int ret;
>   
>   	ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
> @@ -246,11 +270,11 @@ static int boe_th101mb31ig002_dsi_probe(struct mipi_dsi_device *dsi)
>   	mipi_dsi_set_drvdata(dsi, ctx);
>   	ctx->dsi = dsi;
>   
> -	dsi->lanes = 4;
> -	dsi->format = MIPI_DSI_FMT_RGB888;
> -	dsi->mode_flags = MIPI_DSI_MODE_VIDEO_BURST |
> -			  MIPI_DSI_MODE_NO_EOT_PACKET |
> -			  MIPI_DSI_MODE_LPM;
> +	desc = of_device_get_match_data(&dsi->dev);

use device_get_match_data() instead, and check the return

> +	dsi->lanes = desc->lanes;
> +	dsi->format = desc->format;
> +	dsi->mode_flags = desc->mode_flags;
> +	ctx->desc = desc;
>   
>   	ctx->power = devm_regulator_get(&dsi->dev, "power");
>   	if (IS_ERR(ctx->power))
> @@ -302,7 +326,9 @@ static void boe_th101mb31ig002_dsi_remove(struct mipi_dsi_device *dsi)
>   }
>   
>   static const struct of_device_id boe_th101mb31ig002_of_match[] = {
> -	{ .compatible = "boe,th101mb31ig002-28a", },
> +	{ .compatible = "boe,th101mb31ig002-28a",
> +	  .data = &boe_th101mb31ig002_desc
> +	},

Weird indentation, please use :
	{
		.compatible = ..,
		.data = ...,
	},

>   	{ /* sentinel */ }
>   };
>   MODULE_DEVICE_TABLE(of, boe_th101mb31ig002_of_match);

Thanks,
Neil