Re: [PATCH v10 3/4] drm/lsdc: add drm driver for loongson display controller

[Sui Jingfeng]

On 2022/2/22 16:27, Maxime Ripard wrote:
> Hi,
>
> On Sun, Feb 20, 2022 at 10:55:53PM +0800, Sui Jingfeng wrote:
> > +/* lsdc_get_display_timings_from_dtb - Get display timings from the device tree
> > + *
> > + * @np: point to the device node contain the display timings
> > + * @pptim: point to where the pointer of struct display_timings is store to
> > + */
> > +static void lsdc_get_display_timings_from_dtb(struct device_node *np,
> > +					      struct display_timings **pptim)
> > +{
> > +	struct display_timings *timings;
> > +
> > +	if (!np)
> > +		return;
> > +
> > +	timings = of_get_display_timings(np);
> > +	if (timings)
> > +		*pptim = timings;
> > +}
> This is not documented in your binding.
>
> > +static int lsdc_get_connector_type(struct drm_device *ddev,
> > +				   struct device_node *output,
> > +				   unsigned int index)
> > +{
> > +	const char *name;
> > +	int ret;
> > +
> > +	ret = of_property_read_string(output, "connector", &name);
> > +	if (ret < 0)
> > +		return DRM_MODE_CONNECTOR_Unknown;
> > +
> > +	if (strncmp(name, "vga-connector", 13) == 0) {
> > +		ret = DRM_MODE_CONNECTOR_VGA;
> > +		drm_info(ddev, "connector%d is VGA\n", index);
> > +	} else if (strncmp(name, "dvi-connector", 13) == 0) {
> > +		bool analog, digital;
> > +
> > +		analog = of_property_read_bool(output, "analog");
> > +		digital = of_property_read_bool(output, "digital");
> > +
> > +		if (analog && !digital)
> > +			ret = DRM_MODE_CONNECTOR_DVIA;
> > +		else if (analog && digital)
> > +			ret = DRM_MODE_CONNECTOR_DVII;
> > +		else
> > +			ret = DRM_MODE_CONNECTOR_DVID;
> > +
> > +		drm_info(ddev, "connector%d is DVI\n", index);
> > +	} else if (strncmp(name, "virtual-connector", 17) == 0) {
> > +		ret = DRM_MODE_CONNECTOR_VIRTUAL;
> > +		drm_info(ddev, "connector%d is virtual\n", index);
> > +	} else if (strncmp(name, "dpi-connector", 13) == 0) {
> > +		ret = DRM_MODE_CONNECTOR_DPI;
> > +		drm_info(ddev, "connector%d is DPI\n", index);
> > +	} else if (strncmp(name, "hdmi-connector", 14) == 0) {
> > +		int res;
> > +		const char *hdmi_type;
> > +
> > +		ret = DRM_MODE_CONNECTOR_HDMIA;
> > +
> > +		res = of_property_read_string(output, "type", &hdmi_type);
> > +		if (res == 0 && !strcmp(hdmi_type, "b"))
> > +			ret = DRM_MODE_CONNECTOR_HDMIB;
> > +
> > +		drm_info(ddev, "connector%d is HDMI, type is %s\n", index, hdmi_type);
> > +	} else {
> > +		ret = DRM_MODE_CONNECTOR_Unknown;
> > +		drm_info(ddev, "The type of connector%d is unknown\n", index);
> > +	}
> > +
> > +	return ret;
> > +}
> Your ports and that you're using the connectors bindings either.
>
> > +struct lsdc_connector *lsdc_connector_init(struct lsdc_device *ldev, unsigned int index)
> > +{
> > +	struct drm_device *ddev = &ldev->drm;
> > +	struct device_node *np = ddev->dev->of_node;
> > +	struct device_node *output = NULL;
> > +	unsigned int connector_type = DRM_MODE_CONNECTOR_Unknown;
> > +	struct device_node *disp_tims_np;
> > +	struct lsdc_connector *lconn;
> > +	struct drm_connector *connector;
> > +	int ret;
> > +
> > +	lconn = devm_kzalloc(ddev->dev, sizeof(*lconn), GFP_KERNEL);
> > +	if (!lconn)
> > +		return ERR_PTR(-ENOMEM);
> > +
> > +	lconn->index = index;
> > +	lconn->has_disp_tim = false;
> > +	lconn->ddc = NULL;
> > +
> > +	output = of_parse_phandle(np, "output-ports", index);
> > +	if (!output) {
> > +		drm_warn(ddev, "no output-ports property, please update dtb\n");
> > +		/*
> > +		 * Providing a blindly support even though no output-ports
> > +		 * property is provided in the dtb.
> > +		 */
> > +		goto DT_SKIPED;
> > +	}
> output-ports is not documented either.
Thanks for you take time review my patch, i will try to document it at 
next version.