drm/panel: Add JDI LT070ME05000 WUXGA DSI Panel

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>
Signed-off-by: Thierry Reding <treding@nvidia.com>

3 files changed, 544 insertions, 0 deletions

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 1500ab99f548..62aba976e744 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 f277eed933d6..a5c7ec0236e0 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 000000000000..5b2340ef74ed
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-jdi-lt070me05000.c
@@ -0,0 +1,532 @@
+/*
+ * 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",
+        "iovcc"
+};
+
+struct jdi_panel {
+        struct drm_panel base;
+        struct mipi_dsi_device *dsi;
+
+        struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
+
+        struct gpio_desc *enable_gpio;
+        struct gpio_desc *reset_gpio;
+        struct gpio_desc *dcdc_en_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, 1);
+
+        gpiod_set_value(jdi->dcdc_en_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->dcdc_en_gpio, 1);
+        usleep_range(10, 20);
+
+        gpiod_set_value(jdi->reset_gpio, 0);
+        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, 1);
+
+        gpiod_set_value(jdi->dcdc_en_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->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->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+        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->dcdc_en_gpio = devm_gpiod_get(dev, "dcdc-en", GPIOD_OUT_LOW);
+        if (IS_ERR(jdi->dcdc_en_gpio)) {
+                ret = PTR_ERR(jdi->dcdc_en_gpio);
+                dev_err(dev, "cannot get dcdc-en-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");