[PATCH v2 3/6] drm/sun4i: dsi: Add bridge support

[PATCH v2 3/6] drm/sun4i: dsi: Add bridge support

[Jagan Teki]

Some display panels would come up with a non-DSI output which
can have an option to connect DSI interface by means of bridge
converter.

This DSI to non-DSI bridge converter would require a bridge
driver that would communicate the DSI controller for bridge
functionalities.

So, add support for bridge functionalities in Allwinner DSI
controller.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 60 +++++++++++++++++++-------
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h |  1 +
 2 files changed, 45 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index ae2fe31b05b1..2b4b1355a88f 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -775,6 +775,9 @@ static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
 	if (!IS_ERR(dsi->panel))
 		drm_panel_prepare(dsi->panel);
 
+	if (!IS_ERR(dsi->bridge))
+		drm_bridge_pre_enable(dsi->bridge);
+
 	/*
 	 * FIXME: This should be moved after the switch to HS mode.
 	 *
@@ -790,6 +793,9 @@ static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
 	if (!IS_ERR(dsi->panel))
 		drm_panel_enable(dsi->panel);
 
+	if (!IS_ERR(dsi->bridge))
+		drm_bridge_enable(dsi->bridge);
+
 	sun6i_dsi_start(dsi, DSI_START_HSC);
 
 	udelay(1000);
@@ -806,6 +812,9 @@ static void sun6i_dsi_encoder_disable(struct drm_encoder *encoder)
 	if (!IS_ERR(dsi->panel)) {
 		drm_panel_disable(dsi->panel);
 		drm_panel_unprepare(dsi->panel);
+	} else if (!IS_ERR(dsi->bridge)) {
+		drm_bridge_disable(dsi->bridge);
+		drm_bridge_post_disable(dsi->bridge);
 	}
 
 	phy_power_off(dsi->dphy);
@@ -969,11 +978,12 @@ static int sun6i_dsi_attach(struct mipi_dsi_host *host,
 
 	dsi->device = device;
 	ret = drm_of_find_panel_or_bridge(host->dev->of_node, 0, 0,
-					  &dsi->panel, NULL);
+					  &dsi->panel, &dsi->bridge);
 	if (ret)
 		return ret;
 
-	dev_info(host->dev, "Attached device %s\n", device->name);
+	dev_info(host->dev, "Attached %s %s\n",
+		 dsi->bridge ? "bridge" : "panel", device->name);
 
 	return 0;
 }
@@ -983,7 +993,10 @@ static int sun6i_dsi_detach(struct mipi_dsi_host *host,
 {
 	struct sun6i_dsi *dsi = host_to_sun6i_dsi(host);
 
-	dsi->panel = NULL;
+	if (dsi->panel)
+		dsi->panel = NULL;
+	else if (dsi->bridge)
+		dsi->bridge = NULL;
 	dsi->device = NULL;
 
 	return 0;
@@ -1055,8 +1068,10 @@ static int sun6i_dsi_bind(struct device *dev, struct device *master,
 	struct sun4i_tcon *tcon0 = sun4i_get_tcon0(drm);
 	int ret;
 
-	if (!dsi->panel)
+	if (!(dsi->panel || dsi->bridge)) {
+		dev_info(drm->dev, "No panel or bridge found... DSI output disabled\n");
 		return -EPROBE_DEFER;
+	}
 
 	dsi->drv = drv;
 
@@ -1078,19 +1093,29 @@ static int sun6i_dsi_bind(struct device *dev, struct device *master,
 	}
 	dsi->encoder.possible_crtcs = BIT(0);
 
-	drm_connector_helper_add(&dsi->connector,
-				 &sun6i_dsi_connector_helper_funcs);
-	ret = drm_connector_init(drm, &dsi->connector,
-				 &sun6i_dsi_connector_funcs,
-				 DRM_MODE_CONNECTOR_DSI);
-	if (ret) {
-		dev_err(dsi->dev,
-			"Couldn't initialise the DSI connector\n");
-		goto err_cleanup_connector;
+	if (dsi->panel) {
+		drm_connector_helper_add(&dsi->connector,
+					 &sun6i_dsi_connector_helper_funcs);
+		ret = drm_connector_init(drm, &dsi->connector,
+					 &sun6i_dsi_connector_funcs,
+					 DRM_MODE_CONNECTOR_DSI);
+		if (ret) {
+			dev_err(dsi->dev,
+				"Couldn't initialise the DSI connector\n");
+			goto err_cleanup_connector;
+		}
+
+		drm_connector_attach_encoder(&dsi->connector, &dsi->encoder);
+		drm_panel_attach(dsi->panel, &dsi->connector);
 	}
 
-	drm_connector_attach_encoder(&dsi->connector, &dsi->encoder);
-	drm_panel_attach(dsi->panel, &dsi->connector);
+	if (dsi->bridge) {
+		ret = drm_bridge_attach(&dsi->encoder, dsi->bridge, NULL);
+		if (ret) {
+			dev_err(dsi->dev, "Couldn't attach the DSI bridge\n");
+			goto err_cleanup_connector;
+		}
+	}
 
 	return 0;
 
@@ -1104,7 +1129,10 @@ static void sun6i_dsi_unbind(struct device *dev, struct device *master,
 {
 	struct sun6i_dsi *dsi = dev_get_drvdata(dev);
 
-	drm_panel_detach(dsi->panel);
+	if (dsi->panel)
+		drm_panel_detach(dsi->panel);
+	else if (dsi->bridge->funcs->detach)
+		dsi->bridge->funcs->detach(dsi->bridge);
 }
 
 static const struct component_ops sun6i_dsi_ops = {
diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
index c570f2b3868f..c76b71259d2e 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
@@ -32,6 +32,7 @@ struct sun6i_dsi {
 	struct sun4i_tcon	*tcon;
 	struct mipi_dsi_device	*device;
 	struct drm_panel	*panel;
+	struct drm_bridge	*bridge;
 };
 
 static inline struct sun6i_dsi *host_to_sun6i_dsi(struct mipi_dsi_host *host)
-- 
2.18.0.321.gffc6fa0e3

[PATCH v2 4/6] dt-bindings: display: bridge: Add ICN6211 MIPI-DSI to RGB converter bridge

[Jagan Teki]

ICN6211 is MIPI-DSI/RGB converter bridge from chipone.
It has a flexible configuration of MIPI DSI signal input
and produce RGB565, RGB666, RGB888 output format.

Add dt-bingings for it.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
 .../display/bridge/chipone,icn6211.txt        | 78 +++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt

diff --git a/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
new file mode 100644
index 000000000000..53a9848ef8b6
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
@@ -0,0 +1,78 @@
+Chipone ICN6211 MIPI-DSI to RGB Converter Bridge
+
+ICN6211 is MIPI-DSI/RGB converter bridge from chipone.
+It has a flexible configuration of MIPI DSI signal input
+and produce RGB565, RGB666, RGB888 output format.
+
+Required properties for RGB:
+- compatible: must be "chipone,icn6211"
+- reg: the virtual channel number of a DSI peripheral
+- reset-gpios: a GPIO phandle for the reset pin
+
+The device node can contain following 'port' child nodes,
+according to the OF graph bindings defined in [1]:
+  0: DSI Input, not required, if the bridge is DSI controlled
+  1: RGB Output, mandatory
+
+[1]: Documentation/devicetree/bindings/media/video-interfaces.txt
+
+Example:
+
+	panel {
+		compatible = "bananapi,s070wv20-ct16", "simple-panel";
+		enable-gpios = <&pio 1 7 GPIO_ACTIVE_HIGH>; /* LCD-PWR-EN: PB7 */
+		backlight = <&backlight>;
+
+		port {
+			panel_out_bridge: endpoint {
+				remote-endpoint = <&bridge_out_panel>;
+			};
+		};
+	};
+
+&dsi {
+	vcc-dsi-supply = <&reg_dcdc1>;		/* VCC-DSI */
+	status = "okay";
+
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		dsi_out: port@0 {
+			reg = <0>;
+
+			dsi_out_bridge: endpoint {
+				remote-endpoint = <&bridge_out_dsi>;
+			};
+		};
+	};
+
+	bridge@0 {
+		compatible = "chipone,icn6211";
+		reg = <0>;
+		reset-gpios = <&r_pio 0 5 GPIO_ACTIVE_HIGH>; /* LCD-RST: PL5 */
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			bridge_in: port@0 {
+				reg = <0>;
+
+				bridge_out_dsi: endpoint {
+					remote-endpoint = <&dsi_out_bridge>;
+				};
+			};
+
+			bridge_out: port@1 {
+				reg = <1>;
+
+				bridge_out_panel: endpoint {
+					remote-endpoint = <&panel_out_bridge>;
+				};
+			};
+		};
+	};
+};
-- 
2.18.0.321.gffc6fa0e3

[PATCH v2 5/6] drm/bridge: Add Chipone ICN6211 MIPI-DSI/RGB converter bridge

[Jagan Teki]

ICN6211 is MIPI-DSI/RGB converter bridge from chipone.
It has a flexible configuration of MIPI DSI signal input
and produce RGB565, RGB666, RGB888 output format.

Add bridge driver for it.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
Note:
- drm_panel_bridge_add seems not working or incompatible 
as per driver setup. any inputs on this would be great.

 MAINTAINERS                              |   6 +
 drivers/gpu/drm/bridge/Kconfig           |  10 +
 drivers/gpu/drm/bridge/Makefile          |   1 +
 drivers/gpu/drm/bridge/chipone-icn6211.c | 344 +++++++++++++++++++++++
 4 files changed, 361 insertions(+)
 create mode 100644 drivers/gpu/drm/bridge/chipone-icn6211.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 4cc30c360fda..97ffb265bedc 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4991,6 +4991,12 @@ T:	git git://anongit.freedesktop.org/drm/drm-misc
 S:	Maintained
 F:	drivers/gpu/drm/bochs/
 
+DRM DRIVER FOR CHIPONE ICN6211 MIPI-DSI to RGB CONVERTOR BRIDGE
+M:	Jagan Teki <jagan@amarulasolutions.com>
+S:	Maintained
+F:	drivers/gpu/drm/bridge/chipone-icn6211.c
+F:	Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
+
 DRM DRIVER FOR FARADAY TVE200 TV ENCODER
 M:	Linus Walleij <linus.walleij@linaro.org>
 T:	git git://anongit.freedesktop.org/drm/drm-misc
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 3dff9997f5e3..2e06be1aaca3 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -36,6 +36,16 @@ config DRM_CDNS_DSI
 	  Support Cadence DPI to DSI bridge. This is an internal
 	  bridge and is meant to be directly embedded in a SoC.
 
+config DRM_CHIPONE_ICN6211
+	tristate "Chipone ICN6211 MIPI-DSI/RGB converter bridge"
+	depends on DRM && DRM_PANEL
+	depends on OF
+	select DRM_MIPI_DSI
+	help
+	  ICN6211 is MIPI-DSI/RGB converter bridge from chipone.
+	  It has a flexible configuration of MIPI DSI signal input
+	  and produce RGB565, RGB666, RGB888 output format.
+
 config DRM_DUMB_VGA_DAC
 	tristate "Dumb VGA DAC Bridge support"
 	depends on OF
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index 4934fcf5a6f8..541fdccad10b 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_DRM_ANALOGIX_ANX78XX) += analogix-anx78xx.o
 obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o
+obj-$(CONFIG_DRM_CHIPONE_ICN6211) += chipone-icn6211.o
 obj-$(CONFIG_DRM_DUMB_VGA_DAC) += dumb-vga-dac.o
 obj-$(CONFIG_DRM_LVDS_ENCODER) += lvds-encoder.o
 obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o
diff --git a/drivers/gpu/drm/bridge/chipone-icn6211.c b/drivers/gpu/drm/bridge/chipone-icn6211.c
new file mode 100644
index 000000000000..76edda52dc57
--- /dev/null
+++ b/drivers/gpu/drm/bridge/chipone-icn6211.c
@@ -0,0 +1,344 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Amarula Solutions
+ * Author: Jagan Teki <jagan@amarulasolutions.com>
+ */
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_mipi_dsi.h>
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_graph.h>
+
+#include <video/mipi_display.h>
+
+struct chipone_bridge_desc {
+	unsigned int lanes;
+	unsigned long mode_flags;
+	enum mipi_dsi_pixel_format format;
+	void (*chipone_bridge_init)(struct drm_bridge *bridge);
+};
+
+struct chipone {
+	struct device *dev;
+	struct drm_bridge bridge;
+	struct drm_connector connector;
+	struct drm_panel *panel;
+	const struct drm_display_mode *mode;
+	const struct chipone_bridge_desc *desc;
+
+	struct gpio_desc *reset_gpio;
+};
+
+static inline struct chipone *bridge_to_chipone(struct drm_bridge *bridge)
+{
+	return container_of(bridge, struct chipone, bridge);
+}
+
+static inline
+struct chipone *connector_to_chipone(struct drm_connector *connector)
+{
+	return container_of(connector, struct chipone, connector);
+}
+
+static int chipone_get_modes(struct drm_connector *connector)
+{
+	struct chipone *icn = connector_to_chipone(connector);
+
+	return drm_panel_get_modes(icn->panel);
+}
+
+static const
+struct drm_connector_helper_funcs chipone_connector_helper_funcs = {
+	.get_modes = chipone_get_modes,
+};
+
+static const struct drm_connector_funcs chipone_connector_funcs = {
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = drm_connector_cleanup,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static void chipone_disable(struct drm_bridge *bridge)
+{
+	struct chipone *icn = bridge_to_chipone(bridge);
+	int ret;
+
+	ret = drm_panel_disable(bridge_to_chipone(bridge)->panel);
+	if (ret < 0)
+		DRM_DEV_ERROR(icn->dev, "error disabling panel (%d)\n", ret);
+}
+
+static void chipone_post_disable(struct drm_bridge *bridge)
+{
+	struct chipone *icn = bridge_to_chipone(bridge);
+	int ret;
+
+	ret = drm_panel_unprepare(icn->panel);
+	if (ret < 0)
+		DRM_DEV_ERROR(icn->dev, "error unpreparing panel (%d)\n", ret);
+
+	msleep(50);
+
+	gpiod_set_value(icn->reset_gpio, 0);
+}
+
+static inline int chipone_dsi_write(struct chipone *icn,  const void *seq,
+				    size_t len)
+{
+	struct mipi_dsi_device *dsi = to_mipi_dsi_device(icn->dev);
+
+	return mipi_dsi_generic_write(dsi, seq, len);
+}
+
+#define CHIPONE_DSI(icn, seq...)				\
+	{							\
+		const u8 d[] = { seq };				\
+		chipone_dsi_write(icn, d, ARRAY_SIZE(d));	\
+	}
+
+static void icn6211_bridge_init(struct drm_bridge *bridge)
+{
+	struct chipone *icn = bridge_to_chipone(bridge);
+	const struct drm_display_mode *mode = icn->mode;
+
+	CHIPONE_DSI(icn, 0x7A, 0xC1);
+
+	/* lower 8 bits of hdisplay */
+	CHIPONE_DSI(icn, 0x20, mode->hdisplay & 0xff);
+
+	/* lower 8 bits of vdisplay */
+	CHIPONE_DSI(icn, 0x21, mode->vdisplay & 0xff);
+
+	/**
+	 * lsb nibble: 2nd nibble of hdisplay
+	 * msb nibble: 2nd nibble of vdisplay
+	 */
+	CHIPONE_DSI(icn, 0x22, (((mode->hdisplay >> 8) & 0xf) |
+		    (((mode->vdisplay >> 8) & 0xf) << 4)));
+
+	/* HFP */
+	CHIPONE_DSI(icn, 0x23, mode->hsync_start - mode->hdisplay);
+
+	/* HSYNC */
+	CHIPONE_DSI(icn, 0x24, mode->hsync_end - mode->hsync_start);
+
+	/* HBP */
+	CHIPONE_DSI(icn, 0x25, mode->htotal - mode->hsync_end);
+
+	CHIPONE_DSI(icn, 0x26, 0x00);
+
+	/* VFP */
+	CHIPONE_DSI(icn, 0x27, mode->vsync_start - mode->vdisplay);
+
+	/* VSYNC */
+	CHIPONE_DSI(icn, 0x28, mode->vsync_end - mode->vsync_start);
+
+	/* VBP */
+	CHIPONE_DSI(icn, 0x29, mode->vtotal - mode->vsync_end);
+
+	/* dsi specific sequence */
+	CHIPONE_DSI(icn, MIPI_DCS_SET_TEAR_OFF, 0x80);
+	CHIPONE_DSI(icn, MIPI_DCS_SET_ADDRESS_MODE, 0x28);
+	CHIPONE_DSI(icn, 0xB5, 0xA0);
+	CHIPONE_DSI(icn, 0x5C, 0xFF);
+	CHIPONE_DSI(icn, MIPI_DCS_SET_COLUMN_ADDRESS, 0x01);
+	CHIPONE_DSI(icn, MIPI_DCS_GET_POWER_SAVE, 0x92);
+	CHIPONE_DSI(icn, 0x6B, 0x71);
+	CHIPONE_DSI(icn, 0x69, 0x2B);
+	CHIPONE_DSI(icn, MIPI_DCS_ENTER_SLEEP_MODE, 0x40);
+	CHIPONE_DSI(icn, MIPI_DCS_EXIT_SLEEP_MODE, 0x98);
+
+	/* icn6211 specific sequence */
+	CHIPONE_DSI(icn, 0xB6, 0x20);
+	CHIPONE_DSI(icn, 0x51, 0x20);
+	CHIPONE_DSI(icn, 0x09, 0x10);
+}
+
+static void chipone_pre_enable(struct drm_bridge *bridge)
+{
+	struct chipone *icn = bridge_to_chipone(bridge);
+	int ret;
+
+	gpiod_set_value(icn->reset_gpio, 0);
+	msleep(20);
+
+	gpiod_set_value(icn->reset_gpio, 1);
+	msleep(50);
+
+	icn->desc->chipone_bridge_init(bridge);
+
+	ret = drm_panel_prepare(icn->panel);
+	if (ret < 0)
+		DRM_DEV_ERROR(icn->dev, "error preparing panel (%d)\n", ret);
+}
+
+static void chipone_enable(struct drm_bridge *bridge)
+{
+	struct chipone *icn = bridge_to_chipone(bridge);
+	int ret;
+
+	ret = drm_panel_enable(icn->panel);
+	if (ret < 0)
+		DRM_DEV_ERROR(icn->dev, "error enabling panel (%d)\n", ret);
+}
+
+static int chipone_attach(struct drm_bridge *bridge)
+{
+	struct chipone *icn = bridge_to_chipone(bridge);
+	struct drm_device *drm = bridge->dev;
+	int ret;
+
+	if (!bridge->encoder) {
+		DRM_ERROR("Parent encoder object not found");
+		return -ENODEV;
+	}
+
+	icn->connector.polled = DRM_CONNECTOR_POLL_HPD;
+	ret = drm_connector_init(drm, &icn->connector,
+				 &chipone_connector_funcs,
+				 DRM_MODE_CONNECTOR_DPI);
+	if (ret) {
+		DRM_DEV_ERROR(icn->dev,
+			      "Couldn't initialise the rgb connector\n");
+		goto err_out;
+	}
+
+	drm_connector_helper_add(&icn->connector,
+				 &chipone_connector_helper_funcs);
+	drm_connector_register(&icn->connector);
+	drm_connector_attach_encoder(&icn->connector, bridge->encoder);
+
+	ret = drm_panel_attach(icn->panel, &icn->connector);
+	if (ret) {
+		DRM_DEV_ERROR(icn->dev, "Couldn't attach our panel\n");
+		goto err_cleanup_connector;
+	}
+
+	return 0;
+
+err_cleanup_connector:
+	drm_encoder_cleanup(bridge->encoder);
+err_out:
+	return ret;
+}
+
+static void chipone_detach(struct drm_bridge *bridge)
+{
+	struct chipone *icn = bridge_to_chipone(bridge);
+
+	drm_connector_unregister(&icn->connector);
+	drm_panel_detach(icn->panel);
+	icn->panel = NULL;
+	drm_connector_put(&icn->connector);
+}
+
+static enum drm_mode_status chipone_mode_valid(struct drm_bridge *bridge,
+					const struct drm_display_mode *mode)
+{
+	struct chipone *icn = bridge_to_chipone(bridge);
+
+	/* mode timings are useful during bridge init */
+	icn->mode = mode;
+
+	return MODE_OK;
+}
+
+static const struct drm_bridge_funcs chipone_bridge_funcs = {
+	.disable = chipone_disable,
+	.post_disable = chipone_post_disable,
+	.enable = chipone_enable,
+	.pre_enable = chipone_pre_enable,
+	.attach = chipone_attach,
+	.detach = chipone_detach,
+	.mode_valid = chipone_mode_valid,
+};
+
+static const struct chipone_bridge_desc icn6211_desc = {
+	.lanes			= 4,
+	.mode_flags		= MIPI_DSI_MODE_VIDEO_SYNC_PULSE,
+	.format			= MIPI_DSI_FMT_RGB888,
+	.chipone_bridge_init	= icn6211_bridge_init,
+};
+
+static int chipone_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	const struct chipone_bridge_desc *desc;
+	struct chipone *icn;
+	int ret;
+
+	icn = devm_kzalloc(dev, sizeof(struct chipone), GFP_KERNEL);
+	if (!icn)
+		return -ENOMEM;
+
+	desc = of_device_get_match_data(dev);
+
+	icn->dev = dev;
+	dsi->mode_flags = desc->mode_flags;
+	dsi->format = desc->format;
+	dsi->lanes = desc->lanes;
+
+	icn->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(icn->reset_gpio)) {
+		DRM_DEV_ERROR(dev, "Couldn't get our reset GPIO\n");
+		return PTR_ERR(icn->reset_gpio);
+	}
+
+	ret = drm_of_find_panel_or_bridge(icn->dev->of_node, 1, 0,
+					  &icn->panel, NULL);
+	if (ret && ret != -EPROBE_DEFER) {
+		DRM_DEV_ERROR(dev, "Couldn't find the panel (ret = %d)\n", ret);
+		return ret;
+	}
+
+	icn->bridge.funcs = &chipone_bridge_funcs;
+	icn->bridge.of_node = dev->of_node;
+
+	drm_bridge_add(&icn->bridge);
+	mipi_dsi_set_drvdata(dsi, icn);
+	icn->desc = desc;
+
+	return mipi_dsi_attach(dsi);
+}
+
+static int chipone_remove(struct mipi_dsi_device *dsi)
+{
+	struct chipone *icn = mipi_dsi_get_drvdata(dsi);
+
+	mipi_dsi_detach(dsi);
+	drm_bridge_remove(&icn->bridge);
+
+	return 0;
+}
+
+static const struct of_device_id chipone_of_match[] = {
+	{ .compatible = "chipone,icn6211", .data = &icn6211_desc },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, chipone_of_match);
+
+static struct mipi_dsi_driver chipone_driver = {
+	.probe = chipone_probe,
+	.remove = chipone_remove,
+	.driver = {
+		.name = "chipone-icn6211",
+		.owner = THIS_MODULE,
+		.of_match_table = chipone_of_match,
+	},
+};
+module_mipi_dsi_driver(chipone_driver);
+
+MODULE_AUTHOR("Jagan Teki <jagan@amarulasolutions.com>");
+MODULE_DESCRIPTION("Chipone ICN6211 MIPI-DSI to RGB Convertor Bridge");
+MODULE_LICENSE("GPL v2");
-- 
2.18.0.321.gffc6fa0e3

[DO NOT MERGE] [PATCH v2 6/6] ARM: dts: sun8i: bananapi-m2m: Enable Bananapi S070WV20-CT16 DSI panel

[Jagan Teki]

This patch add support for Bananapi S070WV20-CT16 DSI panel to
BPI-M2M board.

Bananapi S070WV20-CT16 is a pure RGB output panel with ICN6211 DSI/RGB
convertor bridge, so enable bridge along with associated panel.

DSI panel connected via board DSI port with,
- DCDC1 as VCC-DSI supply
- PL5 gpio for bridge reset gpio pin
- PB7 gpio for lcd enable gpio pin
- PL4 gpio for backlight enable pin

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
 arch/arm/boot/dts/sun8i-r16-bananapi-m2m.dts | 86 ++++++++++++++++++++
 1 file changed, 86 insertions(+)

diff --git a/arch/arm/boot/dts/sun8i-r16-bananapi-m2m.dts b/arch/arm/boot/dts/sun8i-r16-bananapi-m2m.dts
index e1c75f7fa3ca..5f3f9523a03e 100644
--- a/arch/arm/boot/dts/sun8i-r16-bananapi-m2m.dts
+++ b/arch/arm/boot/dts/sun8i-r16-bananapi-m2m.dts
@@ -44,6 +44,7 @@
 #include "sun8i-a33.dtsi"
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/pwm/pwm.h>
 
 / {
 	model = "BananaPi M2 Magic";
@@ -61,6 +62,14 @@
 		stdout-path = "serial0:115200n8";
 	};
 
+	backlight: backlight {
+		compatible = "pwm-backlight";
+		pwms = <&pwm 0 50000 PWM_POLARITY_INVERTED>;
+		brightness-levels = <1 2 4 8 16 32 64 128 255>;
+		default-brightness-level = <8>;
+		enable-gpios = <&r_pio 0 4 GPIO_ACTIVE_HIGH>; /* LCD-BL-EN: PL4 */
+	};
+
 	leds {
 		compatible = "gpio-leds";
 
@@ -81,6 +90,18 @@
 		};
 	};
 
+	panel {
+		compatible = "bananapi,s070wv20-ct16", "simple-panel";
+		enable-gpios = <&pio 1 7 GPIO_ACTIVE_HIGH>; /* LCD-PWR-EN: PB7 */
+		backlight = <&backlight>;
+
+		port {
+			panel_out_bridge: endpoint {
+				remote-endpoint = <&bridge_out_panel>;
+			};
+		};
+	};
+
 	reg_vcc5v0: vcc5v0 {
 		compatible = "regulator-fixed";
 		regulator-name = "vcc5v0";
@@ -122,6 +143,61 @@
 	status = "okay";
 };
 
+&de {
+	status = "okay";
+};
+
+&dphy {
+	status = "okay";
+};
+
+&dsi {
+	vcc-dsi-supply = <&reg_dcdc1>;		/* VCC-DSI */
+	status = "okay";
+
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		dsi_out: port@0 {
+			reg = <0>;
+
+			dsi_out_bridge: endpoint {
+				remote-endpoint = <&bridge_out_dsi>;
+			};
+		};
+	};
+
+	bridge@0 {
+		compatible = "chipone,icn6211";
+		reg = <0>;
+		reset-gpios = <&r_pio 0 5 GPIO_ACTIVE_HIGH>; /* LCD-RST: PL5 */
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			bridge_in: port@0 {
+				reg = <0>;
+
+				bridge_out_dsi: endpoint {
+					remote-endpoint = <&dsi_out_bridge>;
+				};
+			};
+
+			bridge_out: port@1 {
+				reg = <1>;
+
+				bridge_out_panel: endpoint {
+					remote-endpoint = <&panel_out_bridge>;
+				};
+			};
+		};
+	};
+};
+
 &ehci0 {
 	status = "okay";
 };
@@ -157,6 +233,12 @@
 	status = "okay";
 };
 
+&pwm {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pwm0_pin>;
+	status = "okay";
+};
+
 &r_rsb {
 	status = "okay";
 
@@ -269,6 +351,10 @@
 	status = "okay";
 };
 
+&tcon0 {
+	status = "okay";
+};
+
 &uart0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart0_pb_pins>;
-- 
2.18.0.321.gffc6fa0e3

Re: [PATCH v2 3/6] drm/sun4i: dsi: Add bridge support

[Maxime Ripard]

Hi,

On Fri, May 24, 2019 at 04:13:14PM +0530, Jagan Teki wrote:
> Some display panels would come up with a non-DSI output which
> can have an option to connect DSI interface by means of bridge
> converter.
>
> This DSI to non-DSI bridge converter would require a bridge
> driver that would communicate the DSI controller for bridge
> functionalities.
>
> So, add support for bridge functionalities in Allwinner DSI
> controller.
>
> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> ---
>  drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 60 +++++++++++++++++++-------
>  drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h |  1 +
>  2 files changed, 45 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> index ae2fe31b05b1..2b4b1355a88f 100644
> --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> @@ -775,6 +775,9 @@ static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
>  	if (!IS_ERR(dsi->panel))
>  		drm_panel_prepare(dsi->panel);
>
> +	if (!IS_ERR(dsi->bridge))
> +		drm_bridge_pre_enable(dsi->bridge);
> +

drm_panel_bridge provides what's needed to deal with both a panel and
a bridge, I guess it would make sense to use this instead of
duplicating everything.

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

Re: [PATCH v2 4/6] dt-bindings: display: bridge: Add ICN6211 MIPI-DSI to RGB converter bridge

[Rob Herring]

On Fri, May 24, 2019 at 04:13:15PM +0530, Jagan Teki wrote:
> ICN6211 is MIPI-DSI/RGB converter bridge from chipone.
> It has a flexible configuration of MIPI DSI signal input
> and produce RGB565, RGB666, RGB888 output format.
> 
> Add dt-bingings for it.
> 
> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> ---
>  .../display/bridge/chipone,icn6211.txt        | 78 +++++++++++++++++++
>  1 file changed, 78 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
> new file mode 100644
> index 000000000000..53a9848ef8b6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
> @@ -0,0 +1,78 @@
> +Chipone ICN6211 MIPI-DSI to RGB Converter Bridge
> +
> +ICN6211 is MIPI-DSI/RGB converter bridge from chipone.
> +It has a flexible configuration of MIPI DSI signal input
> +and produce RGB565, RGB666, RGB888 output format.
> +
> +Required properties for RGB:
> +- compatible: must be "chipone,icn6211"
> +- reg: the virtual channel number of a DSI peripheral
> +- reset-gpios: a GPIO phandle for the reset pin
> +
> +The device node can contain following 'port' child nodes,
> +according to the OF graph bindings defined in [1]:
> +  0: DSI Input, not required, if the bridge is DSI controlled
> +  1: RGB Output, mandatory
> +
> +[1]: Documentation/devicetree/bindings/media/video-interfaces.txt
> +
> +Example:
> +
> +	panel {
> +		compatible = "bananapi,s070wv20-ct16", "simple-panel";

'simple-panel' is not a valid compatible string.

> +		enable-gpios = <&pio 1 7 GPIO_ACTIVE_HIGH>; /* LCD-PWR-EN: PB7 */
> +		backlight = <&backlight>;
> +
> +		port {
> +			panel_out_bridge: endpoint {
> +				remote-endpoint = <&bridge_out_panel>;
> +			};
> +		};
> +	};
> +
> +&dsi {
> +	vcc-dsi-supply = <&reg_dcdc1>;		/* VCC-DSI */
> +	status = "okay";
> +
> +	ports {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		dsi_out: port@0 {
> +			reg = <0>;
> +
> +			dsi_out_bridge: endpoint {
> +				remote-endpoint = <&bridge_out_dsi>;
> +			};
> +		};
> +	};
> +
> +	bridge@0 {
> +		compatible = "chipone,icn6211";
> +		reg = <0>;
> +		reset-gpios = <&r_pio 0 5 GPIO_ACTIVE_HIGH>; /* LCD-RST: PL5 */
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		ports {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +
> +			bridge_in: port@0 {
> +				reg = <0>;
> +
> +				bridge_out_dsi: endpoint {
> +					remote-endpoint = <&dsi_out_bridge>;
> +				};
> +			};
> +
> +			bridge_out: port@1 {
> +				reg = <1>;
> +
> +				bridge_out_panel: endpoint {
> +					remote-endpoint = <&panel_out_bridge>;
> +				};
> +			};
> +		};
> +	};
> +};
> -- 
> 2.18.0.321.gffc6fa0e3
>