Add support for the JDI LT070ME05000 WUXGA DSI panel used in Nexus 7 2013 devices.

Programming sequence for the panel is was originally found in the android-msm-flo-3.4-lollipop-release branch from: https://android.googlesource.com/kernel/msm.git

And video mode setting is from dsi-panel-jdi-dualmipi1-video.dtsi file in: git://codeaurora.org/kernel/msm-3.10.git LNX.LA.3.6_rb1.27

Cc: Archit Taneja archit.taneja@gmail.com Cc: Rob Clark robdclark@gmail.com Cc: Sumit Semwal sumit.semwal@linaro.org Cc: John Stultz john.stultz@linaro.org Cc: Emil Velikov emil.l.velikov@gmail.com Cc: Thierry Reding thierry.reding@gmail.com Cc: David Airlie airlied@linux.ie Signed-off-by: Sumit Semwal sumit.semwal@linaro.org Signed-off-by: John Stultz john.stultz@linaro.org Signed-off-by: Vinay Simha BN simhavcs@gmail.com Tested-by: John Stultz john.stultz@linaro.org Reviewed-by: Emil Velikov emil.l.velikov@gmail.com

--- v1: * sumit ported to drm/panel framework, john cherry-picked to mainline, folded down other fixes from Vinay and Archit, vinay removed interface setting cmd mode, video mode panel selected

v2: * incorporated code reviews from theiry, archit code style, alphabetical soring in Makefile, Kconfig, regulator_bulk, arrays of u8, generic helper function, documentation bindings,

v3: * dcs backlight support added * tested this panel driver in nexus7 2013 device

v4: * backlight interface added in the panel driver * incorporated width_mm and height_mm suggested by rob herring

v5: * theirry review comments incorporated panel model naming consistent, alphabetical soring in Kconfig Makefile, MAX_BRIGHTNESS dropped, regulator_names, parameterize panel width and height, descprition for control display, cabc and interface setting, temporary variable removed, consistent error reporting and commit message * removed tear on/off, scanline, since these are required only for command mode panels

v6: * emil review comments incorporated PANEL_NUM_REGULATORS dropped, return ret added at necessary places, if checks dropped for backlight and gpios

v7: * emil review comments incorporated added ARRAY_SIZE in struct, regulator_bulk_disable in poweroff, gpios checks dropped. some returns cannot be dropped, since drm panel framework return type required.

v8: * emil review commnets incorporated for jdi_panel_unprepare, dropped the returns (ref: panel-sharp-lq101r1sx01.c) and for jdi_panel_prepare(panel_on) it does not return prematurely and goes to poweroff if not success * few dev_err's for panel_init

v9: * function drm_panel_create_dsi_backlight made as static --- drivers/gpu/drm/panel/Kconfig | 11 + drivers/gpu/drm/panel/Makefile | 1 + drivers/gpu/drm/panel/panel-jdi-lt070me05000.c | 518 +++++++++++++++++++++++++ 3 files changed, 530 insertions(+) create mode 100644 drivers/gpu/drm/panel/panel-jdi-lt070me05000.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig index 1500ab9..62aba97 100644 --- a/drivers/gpu/drm/panel/Kconfig +++ b/drivers/gpu/drm/panel/Kconfig @@ -18,6 +18,17 @@ config DRM_PANEL_SIMPLE that it can be automatically turned off when the panel goes into a low power state.

+config DRM_PANEL_JDI_LT070ME05000 + tristate "JDI LT070ME05000 WUXGA DSI panel" + depends on OF + depends on DRM_MIPI_DSI + depends on BACKLIGHT_CLASS_DEVICE + help + Say Y here if you want to enable support for JDI DSI video mode + panel as found in Google Nexus 7 (2013) devices. + The panel has a 1200(RGB)×1920 (WUXGA) resolution and uses + 24 bit per pixel. + config DRM_PANEL_SAMSUNG_LD9040 tristate "Samsung LD9040 RGB/SPI panel" depends on OF && SPI diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile index f277eed..a5c7ec0 100644 --- a/drivers/gpu/drm/panel/Makefile +++ b/drivers/gpu/drm/panel/Makefile @@ -1,4 +1,5 @@ obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o +obj-$(CONFIG_DRM_PANEL_JDI_LT070ME05000) += panel-jdi-lt070me05000.o obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o obj-$(CONFIG_DRM_PANEL_PANASONIC_VVX10F034N00) += panel-panasonic-vvx10f034n00.o obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o diff --git a/drivers/gpu/drm/panel/panel-jdi-lt070me05000.c b/drivers/gpu/drm/panel/panel-jdi-lt070me05000.c new file mode 100644 index 0000000..517fa89 --- /dev/null +++ b/drivers/gpu/drm/panel/panel-jdi-lt070me05000.c @@ -0,0 +1,518 @@ +/* + * Copyright (C) 2016 InforceComputing + * Author: Vinay Simha BN simhavcs@gmail.com + * + * Copyright (C) 2016 Linaro Ltd + * Author: Sumit Semwal sumit.semwal@linaro.org + * + * From internet archives, the panel for Nexus 7 2nd Gen, 2013 model is a + * JDI model LT070ME05000, and its data sheet is at: + * http://panelone.net/en/7-0-inch/JDI_LT070ME05000_7.0_inch-datasheet + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see http://www.gnu.org/licenses/. + */ +#include <linux/backlight.h> +#include <linux/gpio/consumer.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/regulator/consumer.h> + +#include <drm/drmP.h> +#include <drm/drm_crtc.h> +#include <drm/drm_mipi_dsi.h> +#include <drm/drm_panel.h> + +#include <video/mipi_display.h> + +static const char * const regulator_names[] = { + "vddp", + "dcdc_en", + "vcc" +}; + +struct jdi_panel { + struct drm_panel base; + struct mipi_dsi_device *dsi; + + struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)]; + + struct gpio_desc *reset_gpio; + struct gpio_desc *enable_gpio; + struct backlight_device *backlight; + + bool prepared; + bool enabled; + + const struct drm_display_mode *mode; +}; + +static inline struct jdi_panel *to_jdi_panel(struct drm_panel *panel) +{ + return container_of(panel, struct jdi_panel, base); +} + +static int jdi_panel_init(struct jdi_panel *jdi) +{ + struct mipi_dsi_device *dsi = jdi->dsi; + struct device *dev = &jdi->dsi->dev; + int ret; + + dsi->mode_flags |= MIPI_DSI_MODE_LPM; + + ret = mipi_dsi_dcs_soft_reset(dsi); + if (ret < 0) + return ret; + + usleep_range(10000, 20000); + + ret = mipi_dsi_dcs_set_pixel_format(dsi, MIPI_DCS_PIXEL_FMT_24BIT << 4); + if (ret < 0) { + dev_err(dev, "failed to set pixel format: %d\n", ret); + return ret; + } + + ret = mipi_dsi_dcs_set_column_address(dsi, 0, jdi->mode->hdisplay - 1); + if (ret < 0) { + dev_err(dev, "failed to set column address: %d\n", ret); + return ret; + } + + ret = mipi_dsi_dcs_set_page_address(dsi, 0, jdi->mode->vdisplay - 1); + if (ret < 0) { + dev_err(dev, "failed to set page address: %d\n", ret); + return ret; + } + + /* + * BIT(5) BCTRL = 1 Backlight Control Block On, Brightness registers + * are active + * BIT(3) BL = 1 Backlight Control On + * BIT(2) DD = 0 Display Dimming is Off + */ + ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY, + (u8[]){ 0x24 }, 1); + if (ret < 0) { + dev_err(dev, "failed to write control display: %d\n", ret); + return ret; + } + + /* CABC off */ + ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_POWER_SAVE, + (u8[]){ 0x00 }, 1); + if (ret < 0) { + dev_err(dev, "failed to set cabc off: %d\n", ret); + return ret; + } + + ret = mipi_dsi_dcs_exit_sleep_mode(dsi); + if (ret < 0) { + dev_err(dev, "failed to set exit sleep mode: %d\n", ret); + return ret; + } + + msleep(120); + + ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x00}, 2); + if (ret < 0) { + dev_err(dev, "failed to set mcap: %d\n", ret); + return ret; + } + + mdelay(10); + + /* Interface setting, video mode */ + ret = mipi_dsi_generic_write(dsi, (u8[]) + {0xB3, 0x26, 0x08, 0x00, 0x20, 0x00}, 6); + if (ret < 0) { + dev_err(dev, "failed to set display interface setting: %d\n" + , ret); + return ret; + } + + mdelay(20); + + ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x03}, 2); + if (ret < 0) { + dev_err(dev, "failed to set default values for mcap: %d\n" + , ret); + return ret; + } + + return 0; +} + +static int jdi_panel_on(struct jdi_panel *jdi) +{ + struct mipi_dsi_device *dsi = jdi->dsi; + struct device *dev = &jdi->dsi->dev; + int ret; + + dsi->mode_flags |= MIPI_DSI_MODE_LPM; + + ret = mipi_dsi_dcs_set_display_on(dsi); + if (ret < 0) + dev_err(dev, "failed to set display on: %d\n", ret); + + return ret; +} + +static void jdi_panel_off(struct jdi_panel *jdi) +{ + struct mipi_dsi_device *dsi = jdi->dsi; + struct device *dev = &jdi->dsi->dev; + int ret; + + dsi->mode_flags &= ~MIPI_DSI_MODE_LPM; + + ret = mipi_dsi_dcs_set_display_off(dsi); + if (ret < 0) + dev_err(dev, "failed to set display off: %d\n", ret); + + ret = mipi_dsi_dcs_enter_sleep_mode(dsi); + if (ret < 0) + dev_err(dev, "failed to enter sleep mode: %d\n", ret); + + msleep(100); +} + +static int jdi_panel_disable(struct drm_panel *panel) +{ + struct jdi_panel *jdi = to_jdi_panel(panel); + + if (!jdi->enabled) + return 0; + + jdi->backlight->props.power = FB_BLANK_POWERDOWN; + backlight_update_status(jdi->backlight); + + jdi->enabled = false; + + return 0; +} + +static int jdi_panel_unprepare(struct drm_panel *panel) +{ + struct jdi_panel *jdi = to_jdi_panel(panel); + struct device *dev = &jdi->dsi->dev; + int ret; + + if (!jdi->prepared) + return 0; + + jdi_panel_off(jdi); + + ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies); + if (ret < 0) + dev_err(dev, "regulator disable failed, %d\n", ret); + + gpiod_set_value(jdi->enable_gpio, 0); + + gpiod_set_value(jdi->reset_gpio, 0); + + jdi->prepared = false; + + return 0; +} + +static int jdi_panel_prepare(struct drm_panel *panel) +{ + struct jdi_panel *jdi = to_jdi_panel(panel); + struct device *dev = &jdi->dsi->dev; + int ret; + + if (jdi->prepared) + return 0; + + ret = regulator_bulk_enable(ARRAY_SIZE(jdi->supplies), jdi->supplies); + if (ret < 0) { + dev_err(dev, "regulator enable failed, %d\n", ret); + return ret; + } + + msleep(20); + + gpiod_set_value(jdi->reset_gpio, 1); + usleep_range(10, 20); + + gpiod_set_value(jdi->enable_gpio, 1); + usleep_range(10, 20); + + ret = jdi_panel_init(jdi); + if (ret < 0) { + dev_err(dev, "failed to init panel: %d\n", ret); + goto poweroff; + } + + ret = jdi_panel_on(jdi); + if (ret < 0) { + dev_err(dev, "failed to set panel on: %d\n", ret); + goto poweroff; + } + + jdi->prepared = true; + + return 0; + +poweroff: + ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies); + if (ret < 0) + dev_err(dev, "regulator disable failed, %d\n", ret); + + gpiod_set_value(jdi->enable_gpio, 0); + + gpiod_set_value(jdi->reset_gpio, 0); + + return ret; +} + +static int jdi_panel_enable(struct drm_panel *panel) +{ + struct jdi_panel *jdi = to_jdi_panel(panel); + + if (jdi->enabled) + return 0; + + jdi->backlight->props.power = FB_BLANK_UNBLANK; + backlight_update_status(jdi->backlight); + + jdi->enabled = true; + + return 0; +} + +static const struct drm_display_mode default_mode = { + .clock = 155493, + .hdisplay = 1200, + .hsync_start = 1200 + 48, + .hsync_end = 1200 + 48 + 32, + .htotal = 1200 + 48 + 32 + 60, + .vdisplay = 1920, + .vsync_start = 1920 + 3, + .vsync_end = 1920 + 3 + 5, + .vtotal = 1920 + 3 + 5 + 6, + .vrefresh = 60, + .flags = 0, +}; + +static int jdi_panel_get_modes(struct drm_panel *panel) +{ + struct drm_display_mode *mode; + struct jdi_panel *jdi = to_jdi_panel(panel); + struct device *dev = &jdi->dsi->dev; + + mode = drm_mode_duplicate(panel->drm, &default_mode); + if (!mode) { + dev_err(dev, "failed to add mode %ux%ux@%u\n", + default_mode.hdisplay, default_mode.vdisplay, + default_mode.vrefresh); + return -ENOMEM; + } + + drm_mode_set_name(mode); + + drm_mode_probed_add(panel->connector, mode); + + panel->connector->display_info.width_mm = 95; + panel->connector->display_info.height_mm = 151; + + return 1; +} + +static int dsi_dcs_bl_get_brightness(struct backlight_device *bl) +{ + struct mipi_dsi_device *dsi = bl_get_data(bl); + int ret; + u16 brightness = bl->props.brightness; + + dsi->mode_flags &= ~MIPI_DSI_MODE_LPM; + + ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness); + if (ret < 0) + return ret; + + dsi->mode_flags |= MIPI_DSI_MODE_LPM; + + return brightness & 0xff; +} + +static int dsi_dcs_bl_update_status(struct backlight_device *bl) +{ + struct mipi_dsi_device *dsi = bl_get_data(bl); + int ret; + + dsi->mode_flags &= ~MIPI_DSI_MODE_LPM; + + ret = mipi_dsi_dcs_set_display_brightness(dsi, bl->props.brightness); + if (ret < 0) + return ret; + + dsi->mode_flags |= MIPI_DSI_MODE_LPM; + + return 0; +} + +static const struct backlight_ops dsi_bl_ops = { + .update_status = dsi_dcs_bl_update_status, + .get_brightness = dsi_dcs_bl_get_brightness, +}; + +static struct backlight_device * +drm_panel_create_dsi_backlight(struct mipi_dsi_device *dsi) +{ + struct device *dev = &dsi->dev; + struct backlight_properties props; + + memset(&props, 0, sizeof(props)); + props.type = BACKLIGHT_RAW; + props.brightness = 255; + props.max_brightness = 255; + + return devm_backlight_device_register(dev, dev_name(dev), dev, dsi, + &dsi_bl_ops, &props); +} + +static const struct drm_panel_funcs jdi_panel_funcs = { + .disable = jdi_panel_disable, + .unprepare = jdi_panel_unprepare, + .prepare = jdi_panel_prepare, + .enable = jdi_panel_enable, + .get_modes = jdi_panel_get_modes, +}; + +static const struct of_device_id jdi_of_match[] = { + { .compatible = "jdi,lt070me05000", }, + { } +}; +MODULE_DEVICE_TABLE(of, jdi_of_match); + +static int jdi_panel_add(struct jdi_panel *jdi) +{ + struct device *dev = &jdi->dsi->dev; + int ret; + unsigned int i; + + jdi->mode = &default_mode; + + for (i = 0; i < ARRAY_SIZE(jdi->supplies); i++) + jdi->supplies[i].supply = regulator_names[i]; + + ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(jdi->supplies), + jdi->supplies); + if (ret < 0) { + dev_err(dev, "failed to init regulator, ret=%d\n", ret); + return ret; + } + + jdi->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(jdi->reset_gpio)) { + ret = PTR_ERR(jdi->reset_gpio); + dev_err(dev, "cannot get reset-gpios %d\n", ret); + return ret; + } + + jdi->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW); + if (IS_ERR(jdi->enable_gpio)) { + ret = PTR_ERR(jdi->enable_gpio); + dev_err(dev, "cannot get enable-gpio %d\n", ret); + return ret; + } + + jdi->backlight = drm_panel_create_dsi_backlight(jdi->dsi); + if (IS_ERR(jdi->backlight)) { + ret = PTR_ERR(jdi->backlight); + dev_err(dev, "failed to register backlight %d\n", ret); + return ret; + } + + drm_panel_init(&jdi->base); + jdi->base.funcs = &jdi_panel_funcs; + jdi->base.dev = &jdi->dsi->dev; + + ret = drm_panel_add(&jdi->base); + + return ret; +} + +static void jdi_panel_del(struct jdi_panel *jdi) +{ + if (jdi->base.dev) + drm_panel_remove(&jdi->base); +} + +static int jdi_panel_probe(struct mipi_dsi_device *dsi) +{ + struct jdi_panel *jdi; + int ret; + + dsi->lanes = 4; + dsi->format = MIPI_DSI_FMT_RGB888; + dsi->mode_flags = MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO | + MIPI_DSI_CLOCK_NON_CONTINUOUS; + + jdi = devm_kzalloc(&dsi->dev, sizeof(*jdi), GFP_KERNEL); + if (!jdi) + return -ENOMEM; + + mipi_dsi_set_drvdata(dsi, jdi); + + jdi->dsi = dsi; + + ret = jdi_panel_add(jdi); + if (ret < 0) + return ret; + + return mipi_dsi_attach(dsi); +} + +static int jdi_panel_remove(struct mipi_dsi_device *dsi) +{ + struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi); + int ret; + + ret = jdi_panel_disable(&jdi->base); + if (ret < 0) + dev_err(&dsi->dev, "failed to disable panel: %d\n", ret); + + ret = mipi_dsi_detach(dsi); + if (ret < 0) + dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", + ret); + + drm_panel_detach(&jdi->base); + jdi_panel_del(jdi); + + return 0; +} + +static void jdi_panel_shutdown(struct mipi_dsi_device *dsi) +{ + struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi); + + jdi_panel_disable(&jdi->base); +} + +static struct mipi_dsi_driver jdi_panel_driver = { + .driver = { + .name = "panel-jdi-lt070me05000", + .of_match_table = jdi_of_match, + }, + .probe = jdi_panel_probe, + .remove = jdi_panel_remove, + .shutdown = jdi_panel_shutdown, +}; +module_mipi_dsi_driver(jdi_panel_driver); + +MODULE_AUTHOR("Sumit Semwal sumit.semwal@linaro.org"); +MODULE_AUTHOR("Vinay Simha BN simhavcs@gmail.com"); +MODULE_DESCRIPTION("JDI LT070ME05000 WUXGA"); +MODULE_LICENSE("GPL v2");