linux-kernel - Re: [PATCH v3 2/2] drm/panel: Add driver for EDO RM69380 OLED panel

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Message-ID: <a92ea6be-d518-4e8a-86a3-1985ff54a24a@wanadoo.fr>
Date: Tue, 16 Apr 2024 22:27:56 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: david@...nlining.org
Cc: conor+dt@...nel.org, daniel@...ll.ch, devicetree@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, konradybcio@...nel.org, krzk+dt@...nel.org,
 linux-kernel@...r.kernel.org, maarten.lankhorst@...ux.intel.com,
 marijn.suijten@...ainline.org, mripard@...nel.org,
 neil.armstrong@...aro.org, phone-devel@...r.kernel.org,
 quic_jesszhan@...cinc.com, robh@...nel.org, sam@...nborg.org,
 tzimmermann@...e.de, ~postmarketos/upstreaming@...ts.sr.ht
Subject: Re: [PATCH v3 2/2] drm/panel: Add driver for EDO RM69380 OLED panel

Le 16/04/2024 à 20:30, David Wronek a écrit :
> Add support for the 2560x1600@...z OLED panel by EDO bundled with a
> Raydium RM69380 controller, as found on the Lenovo Xiaoxin Pad Pro 2021.
> 
> Signed-off-by: David Wronek <david-vu3DzTD92ROXwddmVfQv5g@...lic.gmane.org>
> ---
>   drivers/gpu/drm/panel/Kconfig                 |  14 +
>   drivers/gpu/drm/panel/Makefile                |   1 +
>   drivers/gpu/drm/panel/panel-raydium-rm69380.c | 367 ++++++++++++++++++++++++++
>   3 files changed, 382 insertions(+)
> 

..

> +static int rm69380_probe(struct mipi_dsi_device *dsi)
> +{
> +	struct mipi_dsi_host *dsi_sec_host;
> +	struct rm69380_panel *ctx;
> +	struct device *dev = &dsi->dev;
> +	struct device_node *dsi_sec;
> +	int ret, i;
> +
> +	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
> +	if (!ctx)
> +		return -ENOMEM;
> +
> +	ctx->supplies[0].supply = "vddio";
> +	ctx->supplies[1].supply = "avdd";
> +	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
> +				      ctx->supplies);
> +	if (ret < 0)
> +		return dev_err_probe(dev, ret, "Failed to get regulators\n");
> +
> +	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> +	if (IS_ERR(ctx->reset_gpio))
> +		return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
> +				     "Failed to get reset-gpios\n");
> +
> +	dsi_sec = of_graph_get_remote_node(dsi->dev.of_node, 1, -1);
> +
> +	if (dsi_sec) {
> +		const struct mipi_dsi_device_info info = { "RM69380", 0,
> +							   dsi_sec };
> +
> +		dev_dbg(dev, "Using Dual-DSI: found `%s`\n", dsi_sec->name);
> +
> +		dsi_sec_host = of_find_mipi_dsi_host_by_node(dsi_sec);
> +		of_node_put(dsi_sec);
> +		if (!dsi_sec_host)
> +			return dev_err_probe(dev, -EPROBE_DEFER,
> +					     "Cannot get secondary DSI host\n");
> +
> +		ctx->dsi[1] =
> +			devm_mipi_dsi_device_register_full(dev, dsi_sec_host, &info);
> +		if (IS_ERR(ctx->dsi[1]))
> +			return dev_err_probe(dev, PTR_ERR(ctx->dsi[1]),
> +					     "Cannot get secondary DSI node\n");
> +
> +		dev_dbg(dev, "Second DSI name `%s`\n", ctx->dsi[1]->name);
> +		mipi_dsi_set_drvdata(ctx->dsi[1], ctx);
> +	} else {
> +		dev_dbg(dev, "Using Single-DSI\n");
> +	}
> +
> +	ctx->dsi[0] = dsi;
> +	mipi_dsi_set_drvdata(dsi, ctx);
> +
> +	drm_panel_init(&ctx->panel, dev, &rm69380_panel_funcs,
> +		       DRM_MODE_CONNECTOR_DSI);
> +	ctx->panel.prepare_prev_first = true;
> +
> +	ctx->panel.backlight = rm69380_create_backlight(dsi);
> +	if (IS_ERR(ctx->panel.backlight))
> +		return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
> +				     "Failed to create backlight\n");
> +
> +	drm_panel_add(&ctx->panel);
> +
> +	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
> +		if (!ctx->dsi[i])
> +			continue;
> +
> +		dev_dbg(&ctx->dsi[i]->dev, "Binding DSI %d\n", i);
> +
> +		ctx->dsi[i]->lanes = 4;
> +		ctx->dsi[i]->format = MIPI_DSI_FMT_RGB888;
> +		ctx->dsi[i]->mode_flags = MIPI_DSI_MODE_VIDEO_BURST |
> +					  MIPI_DSI_CLOCK_NON_CONTINUOUS;
> +
> +		ret = mipi_dsi_attach(ctx->dsi[i]);
> +		if (ret < 0) {
> +			mipi_dsi_detach(ctx->dsi[i]);

I don't think this works.
if 'i' fails, you have to detach 0...i-1

maybe something like below (complety untested).

> +			drm_panel_remove(&ctx->panel);
> +			return dev_err_probe(dev, ret,
> +					     "Failed to attach to DSI%d\n", i);
> +		}
> +	}
> +
> +	return 0;
> +}


	drm_panel_add(&ctx->panel);

	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
		if (!ctx->dsi[i])
			continue;

		dev_dbg(&ctx->dsi[i]->dev, "Binding DSI %d\n", i);

		ctx->dsi[i]->lanes = 4;
		ctx->dsi[i]->format = MIPI_DSI_FMT_RGB888;
		ctx->dsi[i]->mode_flags = MIPI_DSI_MODE_VIDEO_BURST |
					  MIPI_DSI_CLOCK_NON_CONTINUOUS;

		ret = mipi_dsi_attach(ctx->dsi[i]);
		if (ret < 0) {
			dev_err_probe(dev, ret,
				      "Failed to attach to DSI%d\n", i);
			goto err_detach_dsi;
		}
	}

	return 0;

err_detach_dsi:
	while (--i >= 0)
		if (ctx->dsi[i])
			mipi_dsi_detach(ctx->dsi[i]);

	drm_panel_remove(&ctx->panel);

	return ret;
}