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Date:   Sat, 15 Aug 2020 12:02:30 +0200
From:   Sam Ravnborg <sam@ravnborg.org>
To:     Guido =?iso-8859-1?Q?G=FCnther?= <agx@sigxcpu.org>
Cc:     Thierry Reding <thierry.reding@gmail.com>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Rob Herring <robh+dt@kernel.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Linus Walleij <linus.walleij@linaro.org>,
        Heiko Stuebner <heiko.stuebner@theobroma-systems.com>,
        Daniel Palmer <daniel@0x0f.com>,
        Lubomir Rintel <lkundrak@v3.sk>,
        Mark Brown <broonie@kernel.org>,
        Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>,
        allen <allen.chen@ite.com.tw>,
        Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/3] drm/panel: Add panel driver for the Mantix
 MLAF057WE51-X DSI panel
Message-ID: <20200815100230.GA1002374@ravnborg.org>
References: <cover.1597412076.git.agx@sigxcpu.org>
 <0a7539135cc46eec5636ca89f52695f4a1197841.1597412076.git.agx@sigxcpu.org>
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Hi Guido.

> +static int mantix_probe(struct mipi_dsi_device *dsi)
> +{
> +	struct device *dev = &dsi->dev;
> +	struct mantix *ctx;
> +	int ret;
> +
> +	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
> +	if (!ctx)
> +		return -ENOMEM;
> +
> +	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
> +	if (IS_ERR(ctx->reset_gpio)) {
> +		DRM_DEV_ERROR(dev, "cannot get reset gpio\n");
> +		return PTR_ERR(ctx->reset_gpio);
> +	}
> +
> +	mipi_dsi_set_drvdata(dsi, ctx);
> +	ctx->dev = 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;
> +
> +	ctx->avdd = devm_regulator_get(dev, "avdd");
> +	if (IS_ERR(ctx->avdd)) {
> +		ret = PTR_ERR(ctx->avdd);
> +		if (ret != -EPROBE_DEFER)
> +			DRM_DEV_ERROR(dev,
> +				      "Failed to request avdd regulator: %d\n",
> +				      ret);
> +		return ret;
> +	}

Consider to use the recently added dev_err_probe() here and below.
Note: Not part of drm-misc-next yet - but hopefully after -rc1
when a backmerge is done.

	Sam

> +	ctx->avee = devm_regulator_get(dev, "avee");
> +	if (IS_ERR(ctx->avee)) {
> +		ret = PTR_ERR(ctx->avee);
> +		if (ret != -EPROBE_DEFER)
> +			DRM_DEV_ERROR(dev,
> +				      "Failed to request avee regulator: %d\n",
> +				      ret);
> +		return ret;
> +	}
> +	ctx->vddi = devm_regulator_get(dev, "vddi");
> +	if (IS_ERR(ctx->vddi)) {
> +		ret = PTR_ERR(ctx->vddi);
> +		if (ret != -EPROBE_DEFER)
> +			DRM_DEV_ERROR(dev,
> +				      "Failed to request vddi regulator: %d\n",
> +				      ret);
> +		return ret;
> +	}
> +
> +	drm_panel_init(&ctx->panel, dev, &mantix_drm_funcs,
> +		       DRM_MODE_CONNECTOR_DSI);
> +
> +	ret = drm_panel_of_backlight(&ctx->panel);
> +	if (ret)
> +		return ret;
> +	drm_panel_add(&ctx->panel);
> +
> +	ret = mipi_dsi_attach(dsi);
> +	if (ret < 0) {
> +		DRM_DEV_ERROR(dev,
> +			      "mipi_dsi_attach failed (%d). Is host ready?\n",
> +			      ret);
> +		drm_panel_remove(&ctx->panel);
> +		return ret;
> +	}
> +
> +	DRM_DEV_INFO(dev, "%ux%u@%u %ubpp dsi %udl - ready\n",
> +		     default_mode.hdisplay, default_mode.vdisplay,
> +		     drm_mode_vrefresh(&default_mode),
> +		     mipi_dsi_pixel_format_to_bpp(dsi->format), dsi->lanes);
> +
> +	return 0;
> +}
> +
> +static void mantix_shutdown(struct mipi_dsi_device *dsi)
> +{
> +	struct mantix *ctx = mipi_dsi_get_drvdata(dsi);
> +	int ret;
> +
> +	ret = drm_panel_unprepare(&ctx->panel);
> +	if (ret < 0)
> +		DRM_DEV_ERROR(&dsi->dev, "Failed to unprepare panel: %d\n",
> +			      ret);
> +
> +	ret = drm_panel_disable(&ctx->panel);
> +	if (ret < 0)
> +		DRM_DEV_ERROR(&dsi->dev, "Failed to disable panel: %d\n",
> +			      ret);
> +}
> +
> +static int mantix_remove(struct mipi_dsi_device *dsi)
> +{
> +	struct mantix *ctx = mipi_dsi_get_drvdata(dsi);
> +	int ret;
> +
> +	mantix_shutdown(dsi);
> +
> +	ret = mipi_dsi_detach(dsi);
> +	if (ret < 0)
> +		DRM_DEV_ERROR(&dsi->dev, "Failed to detach from DSI host: %d\n",
> +			      ret);
> +
> +	drm_panel_remove(&ctx->panel);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id mantix_of_match[] = {
> +	{ .compatible = "mantix,mlaf057we51-x" },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, mantix_of_match);
> +
> +static struct mipi_dsi_driver mantix_driver = {
> +	.probe	= mantix_probe,
> +	.remove = mantix_remove,
> +	.shutdown = mantix_shutdown,
> +	.driver = {
> +		.name = DRV_NAME,
> +		.of_match_table = mantix_of_match,
> +	},
> +};
> +module_mipi_dsi_driver(mantix_driver);
> +
> +MODULE_AUTHOR("Guido G?nther <agx@sigxcpu.org>");
> +MODULE_DESCRIPTION("DRM driver for Mantix MLAF057WE51-X MIPI DSI panel");
> +MODULE_LICENSE("GPL v2");
> -- 
> 2.26.2
> 
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