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Subject[PATCH 10/12] drm/panel: Add Bananapi S070WV20-CT16 MIPI-DSI panel driver
Date
Bananapi S070WV20-CT16 is 800x480, 4-lane MIPI-DSI panel which
can be used to connect via BPI-M64 board, so add a driver for it.

The same panel PCB comes with parallel RBG which is supported via
panel-simple driver with "bananapi,s070wv20-ct16" compatible.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
drivers/gpu/drm/panel/Kconfig | 9 +
drivers/gpu/drm/panel/Makefile | 1 +
.../gpu/drm/panel/panel-bananapi-s070wv20.c | 336 ++++++++++++++++++
3 files changed, 346 insertions(+)
create mode 100644 drivers/gpu/drm/panel/panel-bananapi-s070wv20.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 6020c30a33b3..d25960a63b10 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -17,6 +17,15 @@ config DRM_PANEL_ARM_VERSATILE
reference designs. The panel is detected using special registers
in the Versatile family syscon registers.

+config DRM_PANEL_BANANAPI_S070WV20
+ tristate "Bananapi S070WV20-CT16 MIPI-DSI panel driver"
+ depends on OF
+ depends on DRM_MIPI_DSI
+ depends on BACKLIGHT_CLASS_DEVICE
+ help
+ Say Y if you want to enable support for panels based on the
+ Bananapi S070WV20-CT16 MIPI-DSI controller.
+
config DRM_PANEL_LVDS
tristate "Generic LVDS panel driver"
depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 5ccaaa9d13af..345b6475d3a4 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -1,5 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_DRM_PANEL_ARM_VERSATILE) += panel-arm-versatile.o
+obj-$(CONFIG_DRM_PANEL_BANANAPI_S070WV20) += panel-bananapi-s070wv20.o
obj-$(CONFIG_DRM_PANEL_LVDS) += panel-lvds.o
obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o
obj-$(CONFIG_DRM_PANEL_ILITEK_IL9322) += panel-ilitek-ili9322.o
diff --git a/drivers/gpu/drm/panel/panel-bananapi-s070wv20.c b/drivers/gpu/drm/panel/panel-bananapi-s070wv20.c
new file mode 100644
index 000000000000..6c9adbec6dd8
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-bananapi-s070wv20.c
@@ -0,0 +1,336 @@
+// SPDX-License-Identifier: (GPL-2.0+ or MIT)
+/*
+ * Copyright (C) 2018 Amarula Solutions
+ * Author: Jagan Teki <jagan@amarulasolutions.com>
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/fb.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include <linux/gpio/consumer.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+
+#include <video/mipi_display.h>
+
+struct s070wv20 {
+ struct drm_panel panel;
+ struct mipi_dsi_device *dsi;
+
+ struct backlight_device *backlight;
+ struct regulator *dvdd;
+ struct regulator *avdd;
+ struct gpio_desc *reset;
+
+ bool is_enabled;
+ bool is_prepared;
+};
+
+static inline struct s070wv20 *panel_to_s070wv20(struct drm_panel *panel)
+{
+ return container_of(panel, struct s070wv20, panel);
+}
+
+struct s070wv20_init_cmd {
+ size_t len;
+ const char *data;
+};
+
+#define S070WV20_INIT_CMD(...) { \
+ .len = sizeof((char[]){__VA_ARGS__}), \
+ .data = (char[]){__VA_ARGS__} }
+
+static const struct s070wv20_init_cmd s070wv20_init_cmds[] = {
+ S070WV20_INIT_CMD(0x7A, 0xC1),
+ S070WV20_INIT_CMD(0x20, 0x20),
+ S070WV20_INIT_CMD(0x21, 0xE0),
+ S070WV20_INIT_CMD(0x22, 0x13),
+ S070WV20_INIT_CMD(0x23, 0x28),
+ S070WV20_INIT_CMD(0x24, 0x30),
+ S070WV20_INIT_CMD(0x25, 0x28),
+ S070WV20_INIT_CMD(0x26, 0x00),
+ S070WV20_INIT_CMD(0x27, 0x0D),
+ S070WV20_INIT_CMD(0x28, 0x03),
+ S070WV20_INIT_CMD(0x29, 0x1D),
+ S070WV20_INIT_CMD(0x34, 0x80),
+ S070WV20_INIT_CMD(0x36, 0x28),
+ S070WV20_INIT_CMD(0xB5, 0xA0),
+ S070WV20_INIT_CMD(0x5C, 0xFF),
+ S070WV20_INIT_CMD(0x2A, 0x01),
+ S070WV20_INIT_CMD(0x56, 0x92),
+ S070WV20_INIT_CMD(0x6B, 0x71),
+ S070WV20_INIT_CMD(0x69, 0x2B),
+ S070WV20_INIT_CMD(0x10, 0x40),
+ S070WV20_INIT_CMD(0x11, 0x98),
+ S070WV20_INIT_CMD(0xB6, 0x20),
+ S070WV20_INIT_CMD(0x51, 0x20),
+ S070WV20_INIT_CMD(0x09, 0x10),
+};
+
+static int s070wv20_prepare(struct drm_panel *panel)
+{
+ struct s070wv20 *ctx = panel_to_s070wv20(panel);
+ struct mipi_dsi_device *dsi = ctx->dsi;
+ unsigned int i;
+ int ret;
+
+ if (ctx->is_prepared)
+ return 0;
+
+ msleep(50);
+
+ gpiod_set_value(ctx->reset, 1);
+ msleep(50);
+
+ gpiod_set_value(ctx->reset, 0);
+ msleep(50);
+
+ gpiod_set_value(ctx->reset, 1);
+ msleep(20);
+
+ ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
+ if (ret < 0) {
+ dev_err(panel->dev, "failed to exit sleep mode: %d\n", ret);
+ return ret;
+ }
+
+ msleep(120);
+
+ for (i = 0; i < ARRAY_SIZE(s070wv20_init_cmds); i++) {
+ const struct s070wv20_init_cmd *cmd = &s070wv20_init_cmds[i];
+
+ ret = mipi_dsi_generic_write(dsi, cmd->data, cmd->len);
+ if (ret < 0)
+ return ret;
+
+ msleep(10);
+ }
+
+ ret = mipi_dsi_dcs_set_display_on(dsi);
+ if (ret < 0) {
+ dev_err(panel->dev, "failed to set display on: %d\n", ret);
+ return ret;
+ }
+
+ ctx->is_prepared = true;
+
+ return 0;
+}
+
+static int s070wv20_enable(struct drm_panel *panel)
+{
+ struct s070wv20 *ctx = panel_to_s070wv20(panel);
+
+ if (ctx->is_enabled)
+ return 0;
+
+ msleep(120);
+
+ backlight_enable(ctx->backlight);
+ ctx->is_enabled = true;
+
+ return 0;
+}
+
+static int s070wv20_disable(struct drm_panel *panel)
+{
+ struct s070wv20 *ctx = panel_to_s070wv20(panel);
+
+ if (!ctx->is_enabled)
+ return 0;
+
+ backlight_disable(ctx->backlight);
+ ctx->is_enabled = false;
+
+ return 0;
+}
+
+static int s070wv20_unprepare(struct drm_panel *panel)
+{
+ struct s070wv20 *ctx = panel_to_s070wv20(panel);
+ int ret;
+
+ if (!ctx->is_prepared)
+ return 0;
+
+ ret = mipi_dsi_dcs_set_display_off(ctx->dsi);
+ if (ret < 0)
+ dev_err(panel->dev, "failed to set display off: %d\n", ret);
+
+ ret = mipi_dsi_dcs_enter_sleep_mode(ctx->dsi);
+ if (ret < 0)
+ dev_err(panel->dev, "failed to enter sleep mode: %d\n", ret);
+
+ msleep(100);
+
+ regulator_disable(ctx->avdd);
+
+ regulator_disable(ctx->dvdd);
+
+ gpiod_set_value(ctx->reset, 0);
+
+ gpiod_set_value(ctx->reset, 1);
+
+ gpiod_set_value(ctx->reset, 0);
+
+ ctx->is_prepared = false;
+
+ return 0;
+}
+
+static const struct drm_display_mode s070wv20_default_mode = {
+ .clock = 30000,
+ .vrefresh = 60,
+
+ .hdisplay = 800,
+ .hsync_start = 800 + 40,
+ .hsync_end = 800 + 40 + 48,
+ .htotal = 800 + 40 + 48 + 40,
+
+ .vdisplay = 480,
+ .vsync_start = 480 + 13,
+ .vsync_end = 480 + 13 + 3,
+ .vtotal = 480 + 13 + 3 + 29,
+};
+
+static int s070wv20_get_modes(struct drm_panel *panel)
+{
+ struct drm_connector *connector = panel->connector;
+ struct s070wv20 *ctx = panel_to_s070wv20(panel);
+ struct drm_display_mode *mode;
+
+ mode = drm_mode_duplicate(panel->drm, &s070wv20_default_mode);
+ if (!mode) {
+ dev_err(&ctx->dsi->dev, "failed to add mode %ux%ux@%u\n",
+ s070wv20_default_mode.hdisplay,
+ s070wv20_default_mode.vdisplay,
+ s070wv20_default_mode.vrefresh);
+ return -ENOMEM;
+ }
+
+ drm_mode_set_name(mode);
+
+ mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+ drm_mode_probed_add(connector, mode);
+
+ panel->connector->display_info.width_mm = 86;
+ panel->connector->display_info.height_mm = 154;
+
+ return 1;
+}
+
+static const struct drm_panel_funcs s070wv20_funcs = {
+ .disable = s070wv20_disable,
+ .unprepare = s070wv20_unprepare,
+ .prepare = s070wv20_prepare,
+ .enable = s070wv20_enable,
+ .get_modes = s070wv20_get_modes,
+};
+
+static int s070wv20_dsi_probe(struct mipi_dsi_device *dsi)
+{
+ struct device_node *np;
+ struct s070wv20 *ctx;
+ int ret;
+
+ ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+ mipi_dsi_set_drvdata(dsi, ctx);
+ ctx->dsi = dsi;
+
+ drm_panel_init(&ctx->panel);
+ ctx->panel.dev = &dsi->dev;
+ ctx->panel.funcs = &s070wv20_funcs;
+
+ ctx->dvdd = devm_regulator_get(&dsi->dev, "dvdd");
+ if (IS_ERR(ctx->dvdd)) {
+ dev_err(&dsi->dev, "Couldn't get dvdd regulator\n");
+ return PTR_ERR(ctx->dvdd);
+ }
+
+ ctx->avdd = devm_regulator_get(&dsi->dev, "avdd");
+ if (IS_ERR(ctx->avdd)) {
+ dev_err(&dsi->dev, "Couldn't get avdd regulator\n");
+ return PTR_ERR(ctx->avdd);
+ }
+
+ ret = regulator_enable(ctx->dvdd);
+ if (ret)
+ return ret;
+
+ msleep(5);
+
+ ret = regulator_enable(ctx->avdd);
+ if (ret)
+ return ret;
+
+ msleep(5);
+
+ ctx->reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW);
+ if (IS_ERR(ctx->reset)) {
+ dev_err(&dsi->dev, "Couldn't get our reset GPIO\n");
+ return PTR_ERR(ctx->reset);
+ }
+
+ np = of_parse_phandle(dsi->dev.of_node, "backlight", 0);
+ if (np) {
+ ctx->backlight = of_find_backlight_by_node(np);
+ of_node_put(np);
+
+ if (!ctx->backlight)
+ return -EPROBE_DEFER;
+ }
+
+ ret = drm_panel_add(&ctx->panel);
+ if (ret < 0)
+ return ret;
+
+ dsi->mode_flags = MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
+ dsi->format = MIPI_DSI_FMT_RGB888;
+ dsi->lanes = 4;
+
+ return mipi_dsi_attach(dsi);
+}
+
+static int s070wv20_dsi_remove(struct mipi_dsi_device *dsi)
+{
+ struct s070wv20 *ctx = mipi_dsi_get_drvdata(dsi);
+
+ mipi_dsi_detach(dsi);
+ drm_panel_remove(&ctx->panel);
+
+ if (ctx->backlight)
+ put_device(&ctx->backlight->dev);
+
+ return 0;
+}
+
+static const struct of_device_id s070wv20_of_match[] = {
+ { .compatible = "bananapi,s070wv20-ct16-dsi", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, s070wv20_of_match);
+
+static struct mipi_dsi_driver s070wv20_driver = {
+ .probe = s070wv20_dsi_probe,
+ .remove = s070wv20_dsi_remove,
+ .driver = {
+ .name = "bananapi-s070wv20-ct16-dsi",
+ .of_match_table = s070wv20_of_match,
+ },
+};
+module_mipi_dsi_driver(s070wv20_driver);
+
+MODULE_AUTHOR("Jagan Teki <jagan@amarulasolutions.com>");
+MODULE_DESCRIPTION("Bananapi S070WV20-CT16 MIPI-DSI");
+MODULE_LICENSE("GPL v2");
--
2.18.0.321.gffc6fa0e3
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