drm/omap: Expose DRM modes instead of timings in display devices

omap_dss_device operations expose fixed video timings through a
.get_timings() operation that return a single timing for the device. To
prepare for the move to drm_bridge, modify the API to instead add DRM
modes directly to the connector.

As this puts more burden on display devices, we also create a helper
function for panels to add a single DRM mode from the panel video
timings.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Tested-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/displays/panel-dpi.c

@@ -68,12 +68,12 @@ static void panel_dpi_disable(struct omap_dss_device *dssdev)
 	regulator_disable(ddata->vcc_supply);
 }
 
-static void panel_dpi_get_timings(struct omap_dss_device *dssdev,
-				  struct videomode *vm)
+static int panel_dpi_get_modes(struct omap_dss_device *dssdev,
+			       struct drm_connector *connector)
 {
 	struct panel_drv_data *ddata = to_panel_data(dssdev);
 
-	*vm = ddata->vm;
+	return omapdss_display_get_modes(connector, &ddata->vm);
 }
 
 static const struct omap_dss_device_ops panel_dpi_ops = {
@@ -83,7 +83,7 @@ static const struct omap_dss_device_ops panel_dpi_ops = {
 	.enable		= panel_dpi_enable,
 	.disable	= panel_dpi_disable,
 
-	.get_timings	= panel_dpi_get_timings,
+	.get_modes	= panel_dpi_get_modes,
 };
 
 static int panel_dpi_probe_of(struct platform_device *pdev)

drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c

@@ -24,6 +24,8 @@
 #include <linux/of_device.h>
 #include <linux/regulator/consumer.h>
 
+#include <drm/drm_connector.h>
+
 #include <video/mipi_display.h>
 #include <video/of_display_timing.h>
 
@@ -1110,12 +1112,12 @@ static void dsicm_ulps_work(struct work_struct *work)
 	mutex_unlock(&ddata->lock);
 }
 
-static void dsicm_get_timings(struct omap_dss_device *dssdev,
-			      struct videomode *vm)
+static int dsicm_get_modes(struct omap_dss_device *dssdev,
+			   struct drm_connector *connector)
 {
 	struct panel_drv_data *ddata = to_panel_data(dssdev);
 
-	*vm = ddata->vm;
+	return omapdss_display_get_modes(connector, &ddata->vm);
 }
 
 static int dsicm_check_timings(struct omap_dss_device *dssdev,
@@ -1156,7 +1158,7 @@ static const struct omap_dss_device_ops dsicm_ops = {
 	.enable		= dsicm_enable,
 	.disable	= dsicm_disable,
 
-	.get_timings	= dsicm_get_timings,
+	.get_modes	= dsicm_get_modes,
 	.check_timings	= dsicm_check_timings,
 };
 

drivers/gpu/drm/omapdrm/displays/panel-lgphilips-lb035q02.c

@@ -139,12 +139,12 @@ static void lb035q02_disable(struct omap_dss_device *dssdev)
 		gpiod_set_value_cansleep(ddata->enable_gpio, 0);
 }
 
-static void lb035q02_get_timings(struct omap_dss_device *dssdev,
-				 struct videomode *vm)
+static int lb035q02_get_modes(struct omap_dss_device *dssdev,
+			      struct drm_connector *connector)
 {
 	struct panel_drv_data *ddata = to_panel_data(dssdev);
 
-	*vm = ddata->vm;
+	return omapdss_display_get_modes(connector, &ddata->vm);
 }
 
 static const struct omap_dss_device_ops lb035q02_ops = {
@@ -154,7 +154,7 @@ static const struct omap_dss_device_ops lb035q02_ops = {
 	.enable		= lb035q02_enable,
 	.disable	= lb035q02_disable,
 
-	.get_timings	= lb035q02_get_timings,
+	.get_modes	= lb035q02_get_modes,
 };
 
 static int lb035q02_probe_of(struct spi_device *spi)

drivers/gpu/drm/omapdrm/displays/panel-nec-nl8048hl11.c

@@ -132,12 +132,12 @@ static void nec_8048_disable(struct omap_dss_device *dssdev)
 	gpiod_set_value_cansleep(ddata->res_gpio, 0);
 }
 
-static void nec_8048_get_timings(struct omap_dss_device *dssdev,
-				 struct videomode *vm)
+static int nec_8048_get_modes(struct omap_dss_device *dssdev,
+			      struct drm_connector *connector)
 {
 	struct panel_drv_data *ddata = to_panel_data(dssdev);
 
-	*vm = ddata->vm;
+	return omapdss_display_get_modes(connector, &ddata->vm);
 }
 
 static const struct omap_dss_device_ops nec_8048_ops = {
@@ -147,7 +147,7 @@ static const struct omap_dss_device_ops nec_8048_ops = {
 	.enable		= nec_8048_enable,
 	.disable	= nec_8048_disable,
 
-	.get_timings	= nec_8048_get_timings,
+	.get_modes	= nec_8048_get_modes,
 };
 
 static int nec_8048_probe(struct spi_device *spi)

drivers/gpu/drm/omapdrm/displays/panel-sharp-ls037v7dw01.c

@@ -111,12 +111,12 @@ static void sharp_ls_post_disable(struct omap_dss_device *dssdev)
 		regulator_disable(ddata->vcc);
 }
 
-static void sharp_ls_get_timings(struct omap_dss_device *dssdev,
-				 struct videomode *vm)
+static int sharp_ls_get_modes(struct omap_dss_device *dssdev,
+			      struct drm_connector *connector)
 {
 	struct panel_drv_data *ddata = to_panel_data(dssdev);
 
-	*vm = ddata->vm;
+	return omapdss_display_get_modes(connector, &ddata->vm);
 }
 
 static const struct omap_dss_device_ops sharp_ls_ops = {
@@ -128,7 +128,7 @@ static const struct omap_dss_device_ops sharp_ls_ops = {
 	.disable	= sharp_ls_disable,
 	.post_disable	= sharp_ls_post_disable,
 
-	.get_timings	= sharp_ls_get_timings,
+	.get_modes	= sharp_ls_get_modes,
 };
 
 static  int sharp_ls_get_gpio_of(struct device *dev, int index, int val,

drivers/gpu/drm/omapdrm/displays/panel-sony-acx565akm.c

@@ -596,12 +596,12 @@ static void acx565akm_disable(struct omap_dss_device *dssdev)
 	mutex_unlock(&ddata->mutex);
 }
 
-static void acx565akm_get_timings(struct omap_dss_device *dssdev,
-				  struct videomode *vm)
+static int acx565akm_get_modes(struct omap_dss_device *dssdev,
+			       struct drm_connector *connector)
 {
 	struct panel_drv_data *ddata = to_panel_data(dssdev);
 
-	*vm = ddata->vm;
+	return omapdss_display_get_modes(connector, &ddata->vm);
 }
 
 static const struct omap_dss_device_ops acx565akm_ops = {
@@ -611,7 +611,7 @@ static const struct omap_dss_device_ops acx565akm_ops = {
 	.enable		= acx565akm_enable,
 	.disable	= acx565akm_disable,
 
-	.get_timings	= acx565akm_get_timings,
+	.get_modes	= acx565akm_get_modes,
 };
 
 static int acx565akm_probe(struct spi_device *spi)

drivers/gpu/drm/omapdrm/displays/panel-tpo-td028ttec1.c

@@ -272,12 +272,12 @@ static void td028ttec1_panel_disable(struct omap_dss_device *dssdev)
 	jbt_reg_write_1(ddata, JBT_REG_POWER_ON_OFF, 0x00);
 }
 
-static void td028ttec1_panel_get_timings(struct omap_dss_device *dssdev,
-					 struct videomode *vm)
+static int td028ttec1_panel_get_modes(struct omap_dss_device *dssdev,
+				      struct drm_connector *connector)
 {
 	struct panel_drv_data *ddata = to_panel_data(dssdev);
 
-	*vm = ddata->vm;
+	return omapdss_display_get_modes(connector, &ddata->vm);
 }
 
 static const struct omap_dss_device_ops td028ttec1_ops = {
@@ -287,7 +287,7 @@ static const struct omap_dss_device_ops td028ttec1_ops = {
 	.enable		= td028ttec1_panel_enable,
 	.disable	= td028ttec1_panel_disable,
 
-	.get_timings	= td028ttec1_panel_get_timings,
+	.get_modes	= td028ttec1_panel_get_modes,
 };
 
 static int td028ttec1_panel_probe(struct spi_device *spi)

drivers/gpu/drm/omapdrm/displays/panel-tpo-td043mtea1.c

@@ -347,12 +347,12 @@ static void tpo_td043_disable(struct omap_dss_device *dssdev)
 		tpo_td043_power_off(ddata);
 }
 
-static void tpo_td043_get_timings(struct omap_dss_device *dssdev,
-				  struct videomode *vm)
+static int tpo_td043_get_modes(struct omap_dss_device *dssdev,
+			       struct drm_connector *connector)
 {
 	struct panel_drv_data *ddata = to_panel_data(dssdev);
 
-	*vm = ddata->vm;
+	return omapdss_display_get_modes(connector, &ddata->vm);
 }
 
 static const struct omap_dss_device_ops tpo_td043_ops = {
@@ -362,7 +362,7 @@ static const struct omap_dss_device_ops tpo_td043_ops = {
 	.enable		= tpo_td043_enable,
 	.disable	= tpo_td043_disable,
 
-	.get_timings	= tpo_td043_get_timings,
+	.get_modes	= tpo_td043_get_modes,
 };
 
 static int tpo_td043_probe(struct spi_device *spi)

drivers/gpu/drm/omapdrm/dss/display.c

@@ -23,6 +23,9 @@
 #include <linux/kernel.h>
 #include <linux/of.h>
 
+#include <drm/drm_connector.h>
+#include <drm/drm_modes.h>
+
 #include "omapdss.h"
 
 static int disp_num_counter;
@@ -58,3 +61,22 @@ struct omap_dss_device *omapdss_display_get(struct omap_dss_device *output)
 	return omapdss_device_get(output);
 }
 EXPORT_SYMBOL_GPL(omapdss_display_get);
+
+int omapdss_display_get_modes(struct drm_connector *connector,
+			      const struct videomode *vm)
+{
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_create(connector->dev);
+	if (!mode)
+		return 0;
+
+	drm_display_mode_from_videomode(vm, mode);
+
+	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+	drm_mode_set_name(mode);
+	drm_mode_probed_add(connector, mode);
+
+	return 1;
+}
+EXPORT_SYMBOL_GPL(omapdss_display_get_modes);

drivers/gpu/drm/omapdrm/dss/omapdss.h

@@ -67,6 +67,7 @@ struct dss_lcd_mgr_config;
 struct snd_aes_iec958;
 struct snd_cea_861_aud_if;
 struct hdmi_avi_infoframe;
+struct drm_connector;
 
 enum omap_display_type {
 	OMAP_DISPLAY_TYPE_NONE		= 0,
@@ -366,8 +367,6 @@ struct omap_dss_device_ops {
 
 	int (*check_timings)(struct omap_dss_device *dssdev,
 			     struct videomode *vm);
-	void (*get_timings)(struct omap_dss_device *dssdev,
-			    struct videomode *vm);
 	void (*set_timings)(struct omap_dss_device *dssdev,
 			    const struct videomode *vm);
 
@@ -381,6 +380,9 @@ struct omap_dss_device_ops {
 
 	int (*read_edid)(struct omap_dss_device *dssdev, u8 *buf, int len);
 
+	int (*get_modes)(struct omap_dss_device *dssdev,
+			 struct drm_connector *connector);
+
 	union {
 		const struct omapdss_hdmi_ops hdmi;
 		const struct omapdss_dsi_ops dsi;
@@ -469,6 +471,8 @@ static inline bool omapdss_is_initialized(void)
 
 void omapdss_display_init(struct omap_dss_device *dssdev);
 struct omap_dss_device *omapdss_display_get(struct omap_dss_device *output);
+int omapdss_display_get_modes(struct drm_connector *connector,
+			      const struct videomode *vm);
 
 void omapdss_device_register(struct omap_dss_device *dssdev);
 void omapdss_device_unregister(struct omap_dss_device *dssdev);

drivers/gpu/drm/omapdrm/dss/venc.c

@@ -548,14 +548,17 @@ static void venc_display_disable(struct omap_dss_device *dssdev)
 	mutex_unlock(&venc->venc_lock);
 }
 
-static void venc_get_timings(struct omap_dss_device *dssdev,
-			     struct videomode *vm)
+static int venc_get_modes(struct omap_dss_device *dssdev,
+			  struct drm_connector *connector)
 {
 	struct venc_device *venc = dssdev_to_venc(dssdev);
+	int r;
 
 	mutex_lock(&venc->venc_lock);
-	*vm = venc->vm;
+	r = omapdss_display_get_modes(connector, &venc->vm);
 	mutex_unlock(&venc->venc_lock);
+
+	return r;
 }
 
 static void venc_set_timings(struct omap_dss_device *dssdev,
@@ -690,8 +693,9 @@ static const struct omap_dss_device_ops venc_ops = {
 	.disable = venc_display_disable,
 
 	.check_timings = venc_check_timings,
-	.get_timings = venc_get_timings,
 	.set_timings = venc_set_timings,
+
+	.get_modes = venc_get_modes,
 };
 
 /* -----------------------------------------------------------------------------

drivers/gpu/drm/omapdrm/omap_connector.c

@@ -212,8 +212,6 @@ static int omap_connector_get_modes(struct drm_connector *connector)
 {
 	struct omap_connector *omap_connector = to_omap_connector(connector);
 	struct omap_dss_device *dssdev;
-	struct drm_display_mode *mode;
-	struct videomode vm = {0};
 
 	DBG("%s", omap_connector->display->name);
 
@@ -238,31 +236,20 @@ static int omap_connector_get_modes(struct drm_connector *connector)
 					 &connector->display_info.height_mm);
 
 	/*
-	 * Iterate over the pipeline to find the first device that can provide
-	 * timing information. If we can't find any, we just let the KMS core
-	 * add the default modes.
+	 * If the display pipeline reports modes (e.g. with a fixed resolution
+	 * panel or an analog TV output), query it.
 	 */
 	for (dssdev = omap_connector->display; dssdev; dssdev = dssdev->src) {
-		if (dssdev->ops->get_timings)
-			break;
+		if (dssdev->ops->get_modes)
+			return dssdev->ops->get_modes(dssdev, connector);
 	}
-	if (!dssdev)
-		return 0;
 
-	/* Add a single mode corresponding to the fixed panel timings. */
-	mode = drm_mode_create(connector->dev);
-	if (!mode)
+	/*
+	 * We can't retrieve modes, which can happen for instance for a DVI or
+	 * VGA output with the DDC bus unconnected. The KMS core will add the
+	 * default modes.
+	 */
 	return 0;
-
-	dssdev->ops->get_timings(dssdev, &vm);
-
-	drm_display_mode_from_videomode(&vm, mode);
-
-	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
-	drm_mode_set_name(mode);
-	drm_mode_probed_add(connector, mode);
-
-	return 1;
 }
 
 static int omap_connector_mode_valid(struct drm_connector *connector,