Date:   Sat, 15 Aug 2020 12:40:22 +0200
From:   Guido Günther <agx@...xcpu.org>
To:     Sam Ravnborg <sam@...nborg.org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Heiko Stuebner <heiko.stuebner@...obroma-systems.com>,
        Daniel Palmer <daniel@...f.com>,
        Lubomir Rintel <lkundrak@...sk>,
        Mark Brown <broonie@...nel.org>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        allen <allen.chen@....com.tw>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] drm/panel: Add panel driver for the Mantix
 MLAF057WE51-X DSI panel

Hi Sam,
On Sat, Aug 15, 2020 at 12:02:30PM +0200, Sam Ravnborg wrote:
> 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.

In fact I did decided against it since i was told that missing dev_* and
DRM_* logging shouldn't be done. So is that o.k. nowadays?
Cheers,
 -- Guido

> 
> 	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 Günther <agx@...xcpu.org>");
> > +MODULE_DESCRIPTION("DRM driver for Mantix MLAF057WE51-X MIPI DSI panel");
> > +MODULE_LICENSE("GPL v2");
> > -- 
> > 2.26.2
> > 
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@...ts.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 

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