[PATCH v3 2/2] drm: bridge: Add Chipone ICN6211 MIPI-DSI to RGB bridge

Jagan Teki
2021-02-14T17:54:51Z

ICN6211 is MIPI-DSI to RGB Convertor 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>
---
Changes for v3:
- updated the driver to inline with new drm bridge style

MAINTAINERS | 6 +
drivers/gpu/drm/bridge/Kconfig | 11 ++
drivers/gpu/drm/bridge/Makefile | 1 +
drivers/gpu/drm/bridge/chipone-icn6211.c | 222 +++++++++++++++++++++++
4 files changed, 240 insertions(+)
create mode 100644 drivers/gpu/drm/bridge/chipone-icn6211.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 9d241b832aae..4f1084aae50d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5529,6 +5529,12 @@ S: Maintained
F: Documentation/devicetree/bindings/display/panel/boe,himax8279d.yaml
F: drivers/gpu/drm/panel/panel-boe-himax8279d.c

+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.yaml
+
DRM DRIVER FOR FARADAY TVE200 TV ENCODER
M: Linus Walleij <linus.walleij@linaro.org>
S: Maintained
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index e4110d6ca7b3..49d1565b7f25 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -27,6 +27,17 @@ 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 Convertor bridge"
+ depends on OF
+ select DRM_MIPI_DSI
+ select DRM_PANEL_BRIDGE
+ help
+ ICN6211 is MIPI-DSI/RGB Convertor bridge from chipone.
+
+ It has a flexible configuration of MIPI DSI signal input
+ and produce RGB565, RGB666, RGB888 output format.
+
config DRM_CHRONTEL_CH7033
tristate "Chrontel CH7033 Video Encoder"
depends on OF
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index 86e7acc76f8d..3eb84b638988 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -1,5 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o
+obj-$(CONFIG_DRM_CHIPONE_ICN6211) += chipone-icn6211.o
obj-$(CONFIG_DRM_CHRONTEL_CH7033) += chrontel-ch7033.o
obj-$(CONFIG_DRM_DISPLAY_CONNECTOR) += display-connector.o
obj-$(CONFIG_DRM_LONTIUM_LT9611) += lontium-lt9611.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..3f478f21a4a5
--- /dev/null
+++ b/drivers/gpu/drm/bridge/chipone-icn6211.c
@@ -0,0 +1,222 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Amarula Solutions(India)
+ * Author: Jagan Teki <jagan@amarulasolutions.com>
+ */
+
+#include <drm/drm_of.h>
+#include <drm/drm_print.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 <video/mipi_display.h>
+
+struct chipone {
+ struct device *dev;
+ struct drm_bridge bridge;
+ struct drm_bridge *panel_bridge;
+ struct gpio_desc *reset_gpio;
+};
+
+static inline struct chipone *bridge_to_chipone(struct drm_bridge *bridge)
+{
+ return container_of(bridge, struct chipone, bridge);
+}
+
+static struct drm_display_mode *bridge_to_mode(struct drm_bridge *bridge)
+{
+ return &bridge->encoder->crtc->state->adjusted_mode;
+}
+
+static void chipone_post_disable(struct drm_bridge *bridge)
+{
+ struct chipone *icn = bridge_to_chipone(bridge);
+
+ gpiod_set_value(icn->reset_gpio, 0);
+
+ msleep(50);
+}
+
+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 chipone_enable(struct drm_bridge *bridge)
+{
+ struct chipone *icn = bridge_to_chipone(bridge);
+ struct drm_display_mode *mode = bridge_to_mode(bridge);
+
+ 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);
+
+ msleep(120);
+}
+
+static void chipone_pre_enable(struct drm_bridge *bridge)
+{
+ struct chipone *icn = bridge_to_chipone(bridge);
+
+ gpiod_set_value(icn->reset_gpio, 1);
+ msleep(20);
+
+ gpiod_set_value(icn->reset_gpio, 0);
+ msleep(20);
+
+ gpiod_set_value(icn->reset_gpio, 1);
+ msleep(50);
+}
+
+static int chipone_attach(struct drm_bridge *bridge, enum drm_bridge_attach_flags flags)
+{
+ struct chipone *icn = bridge_to_chipone(bridge);
+
+ return drm_bridge_attach(bridge->encoder, icn->panel_bridge, bridge, flags);
+}
+
+static const struct drm_bridge_funcs chipone_bridge_funcs = {
+ .post_disable = chipone_post_disable,
+ .enable = chipone_enable,
+ .pre_enable = chipone_pre_enable,
+ .attach = chipone_attach,
+};
+
+static int chipone_probe(struct mipi_dsi_device *dsi)
+{
+ struct device *dev = &dsi->dev;
+ struct drm_panel *panel;
+ struct chipone *icn;
+ int ret;
+
+ icn = devm_kzalloc(dev, sizeof(struct chipone), GFP_KERNEL);
+ if (!icn)
+ return -ENOMEM;
+
+ mipi_dsi_set_drvdata(dsi, icn);
+ icn->dev = dev;
+
+ dsi->mode_flags = MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
+ dsi->format = MIPI_DSI_FMT_RGB888;
+ dsi->lanes = 4;
+
+ icn->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+ if (IS_ERR(icn->reset_gpio)) {
+ DRM_DEV_ERROR(dev, "failed to get reset GPIO\n");
+ return PTR_ERR(icn->reset_gpio);
+ }
+
+ ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL);
+ if (ret)
+ return ret;
+
+ icn->panel_bridge = devm_drm_panel_bridge_add(dev, panel);
+ if (IS_ERR(icn->panel_bridge))
+ return PTR_ERR(icn->panel_bridge);
+
+ icn->bridge.funcs = &chipone_bridge_funcs;
+ icn->bridge.type = DRM_MODE_CONNECTOR_DPI;
+ icn->bridge.of_node = dev->of_node;
+
+ drm_bridge_add(&icn->bridge);
+
+ ret = mipi_dsi_attach(dsi);
+ if (ret < 0) {
+ drm_bridge_remove(&icn->bridge);
+ dev_err(dev, "failed to attach dsi\n");
+ }
+
+ return ret;
+}
+
+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", },
+ { /* 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");
--
2.25.1