drm/panel: Add Sharp LS043T1LE01 MIPI DSI panel

The Sharp LS043T1LE01 is a 4.3", 540x960 TFT-LCD panel connected using
two DSI lanes. It is for example found on the Qualcomm Snapdragon 800
Dragonboard (APQ8074).

Signed-off-by: Werner Johansson <werner.johansson@sonymobile.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Reviewed-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>

3 files changed, 397 insertions, 0 deletions

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 15a396014a59..1500ab99f548 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -61,4 +61,13 @@ config DRM_PANEL_SHARP_LQ101R1SX01
           To compile this driver as a module, choose M here: the module
           will be called panel-sharp-lq101r1sx01.
 
+config DRM_PANEL_SHARP_LS043T1LE01
+        tristate "Sharp LS043T1LE01 qHD video mode 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 Sharp LS043T1LE01 qHD
+          (540x960) DSI panel as found on the Qualcomm APQ8074 Dragonboard
+
 endmenu
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 053287a72825..f277eed933d6 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -4,3 +4,4 @@ obj-$(CONFIG_DRM_PANEL_PANASONIC_VVX10F034N00) += panel-panasonic-vvx10f034n00.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o
 obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
+obj-$(CONFIG_DRM_PANEL_SHARP_LS043T1LE01) += panel-sharp-ls043t1le01.o
diff --git a/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c b/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c
new file mode 100644
index 000000000000..3aeb0bda4947
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c
@@ -0,0 +1,387 @@
+/*
+ * Copyright (C) 2015 Red Hat
+ * Copyright (C) 2015 Sony Mobile Communications Inc.
+ * Author: Werner Johansson <werner.johansson@sonymobile.com>
+ *
+ * Based on AUO panel driver by Rob Clark <robdclark@gmail.com>
+ *
+ * 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>
+
+struct sharp_nt_panel {
+        struct drm_panel base;
+        struct mipi_dsi_device *dsi;
+
+        struct backlight_device *backlight;
+        struct regulator *supply;
+        struct gpio_desc *reset_gpio;
+
+        bool prepared;
+        bool enabled;
+
+        const struct drm_display_mode *mode;
+};
+
+static inline struct sharp_nt_panel *to_sharp_nt_panel(struct drm_panel *panel)
+{
+        return container_of(panel, struct sharp_nt_panel, base);
+}
+
+static int sharp_nt_panel_init(struct sharp_nt_panel *sharp_nt)
+{
+        struct mipi_dsi_device *dsi = sharp_nt->dsi;
+        int ret;
+
+        dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+        ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
+        if (ret < 0)
+                return ret;
+
+        msleep(120);
+
+        /* Novatek two-lane operation */
+        ret = mipi_dsi_dcs_write(dsi, 0xae, (u8[]){ 0x03 }, 1);
+        if (ret < 0)
+                return ret;
+
+        /* Set both MCU and RGB I/F to 24bpp */
+        ret = mipi_dsi_dcs_set_pixel_format(dsi, MIPI_DCS_PIXEL_FMT_24BIT |
+                                        (MIPI_DCS_PIXEL_FMT_24BIT << 4));
+        if (ret < 0)
+                return ret;
+
+        return 0;
+}
+
+static int sharp_nt_panel_on(struct sharp_nt_panel *sharp_nt)
+{
+        struct mipi_dsi_device *dsi = sharp_nt->dsi;
+        int ret;
+
+        dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+        ret = mipi_dsi_dcs_set_display_on(dsi);
+        if (ret < 0)
+                return ret;
+
+        return 0;
+}
+
+static int sharp_nt_panel_off(struct sharp_nt_panel *sharp_nt)
+{
+        struct mipi_dsi_device *dsi = sharp_nt->dsi;
+        int ret;
+
+        dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+        ret = mipi_dsi_dcs_set_display_off(dsi);
+        if (ret < 0)
+                return ret;
+
+        ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
+        if (ret < 0)
+                return ret;
+
+        return 0;
+}
+
+
+static int sharp_nt_panel_disable(struct drm_panel *panel)
+{
+        struct sharp_nt_panel *sharp_nt = to_sharp_nt_panel(panel);
+
+        if (!sharp_nt->enabled)
+                return 0;
+
+        if (sharp_nt->backlight) {
+                sharp_nt->backlight->props.power = FB_BLANK_POWERDOWN;
+                backlight_update_status(sharp_nt->backlight);
+        }
+
+        sharp_nt->enabled = false;
+
+        return 0;
+}
+
+static int sharp_nt_panel_unprepare(struct drm_panel *panel)
+{
+        struct sharp_nt_panel *sharp_nt = to_sharp_nt_panel(panel);
+        int ret;
+
+        if (!sharp_nt->prepared)
+                return 0;
+
+        ret = sharp_nt_panel_off(sharp_nt);
+        if (ret < 0) {
+                dev_err(panel->dev, "failed to set panel off: %d\n", ret);
+                return ret;
+        }
+
+        regulator_disable(sharp_nt->supply);
+        if (sharp_nt->reset_gpio)
+                gpiod_set_value(sharp_nt->reset_gpio, 0);
+
+        sharp_nt->prepared = false;
+
+        return 0;
+}
+
+static int sharp_nt_panel_prepare(struct drm_panel *panel)
+{
+        struct sharp_nt_panel *sharp_nt = to_sharp_nt_panel(panel);
+        int ret;
+
+        if (sharp_nt->prepared)
+                return 0;
+
+        ret = regulator_enable(sharp_nt->supply);
+        if (ret < 0)
+                return ret;
+
+        msleep(20);
+
+        if (sharp_nt->reset_gpio) {
+                gpiod_set_value(sharp_nt->reset_gpio, 1);
+                msleep(1);
+                gpiod_set_value(sharp_nt->reset_gpio, 0);
+                msleep(1);
+                gpiod_set_value(sharp_nt->reset_gpio, 1);
+                msleep(10);
+        }
+
+        ret = sharp_nt_panel_init(sharp_nt);
+        if (ret < 0) {
+                dev_err(panel->dev, "failed to init panel: %d\n", ret);
+                goto poweroff;
+        }
+
+        ret = sharp_nt_panel_on(sharp_nt);
+        if (ret < 0) {
+                dev_err(panel->dev, "failed to set panel on: %d\n", ret);
+                goto poweroff;
+        }
+
+        sharp_nt->prepared = true;
+
+        return 0;
+
+poweroff:
+        regulator_disable(sharp_nt->supply);
+        if (sharp_nt->reset_gpio)
+                gpiod_set_value(sharp_nt->reset_gpio, 0);
+        return ret;
+}
+
+static int sharp_nt_panel_enable(struct drm_panel *panel)
+{
+        struct sharp_nt_panel *sharp_nt = to_sharp_nt_panel(panel);
+
+        if (sharp_nt->enabled)
+                return 0;
+
+        if (sharp_nt->backlight) {
+                sharp_nt->backlight->props.power = FB_BLANK_UNBLANK;
+                backlight_update_status(sharp_nt->backlight);
+        }
+
+        sharp_nt->enabled = true;
+
+        return 0;
+}
+
+static const struct drm_display_mode default_mode = {
+        .clock = 41118,
+        .hdisplay = 540,
+        .hsync_start = 540 + 48,
+        .hsync_end = 540 + 48 + 80,
+        .htotal = 540 + 48 + 80 + 32,
+        .vdisplay = 960,
+        .vsync_start = 960 + 3,
+        .vsync_end = 960 + 3 + 15,
+        .vtotal = 960 + 3 + 15 + 1,
+        .vrefresh = 60,
+};
+
+static int sharp_nt_panel_get_modes(struct drm_panel *panel)
+{
+        struct drm_display_mode *mode;
+
+        mode = drm_mode_duplicate(panel->drm, &default_mode);
+        if (!mode) {
+                dev_err(panel->drm->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 = 54;
+        panel->connector->display_info.height_mm = 95;
+
+        return 1;
+}
+
+static const struct drm_panel_funcs sharp_nt_panel_funcs = {
+        .disable = sharp_nt_panel_disable,
+        .unprepare = sharp_nt_panel_unprepare,
+        .prepare = sharp_nt_panel_prepare,
+        .enable = sharp_nt_panel_enable,
+        .get_modes = sharp_nt_panel_get_modes,
+};
+
+static int sharp_nt_panel_add(struct sharp_nt_panel *sharp_nt)
+{
+        struct device *dev = &sharp_nt->dsi->dev;
+        struct device_node *np;
+        int ret;
+
+        sharp_nt->mode = &default_mode;
+
+        sharp_nt->supply = devm_regulator_get(dev, "avdd");
+        if (IS_ERR(sharp_nt->supply))
+                return PTR_ERR(sharp_nt->supply);
+
+        sharp_nt->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+        if (IS_ERR(sharp_nt->reset_gpio)) {
+                dev_err(dev, "cannot get reset-gpios %ld\n",
+                        PTR_ERR(sharp_nt->reset_gpio));
+                sharp_nt->reset_gpio = NULL;
+        } else {
+                gpiod_set_value(sharp_nt->reset_gpio, 0);
+        }
+
+        np = of_parse_phandle(dev->of_node, "backlight", 0);
+        if (np) {
+                sharp_nt->backlight = of_find_backlight_by_node(np);
+                of_node_put(np);
+
+                if (!sharp_nt->backlight)
+                        return -EPROBE_DEFER;
+        }
+
+        drm_panel_init(&sharp_nt->base);
+        sharp_nt->base.funcs = &sharp_nt_panel_funcs;
+        sharp_nt->base.dev = &sharp_nt->dsi->dev;
+
+        ret = drm_panel_add(&sharp_nt->base);
+        if (ret < 0)
+                goto put_backlight;
+
+        return 0;
+
+put_backlight:
+        if (sharp_nt->backlight)
+                put_device(&sharp_nt->backlight->dev);
+
+        return ret;
+}
+
+static void sharp_nt_panel_del(struct sharp_nt_panel *sharp_nt)
+{
+        if (sharp_nt->base.dev)
+                drm_panel_remove(&sharp_nt->base);
+
+        if (sharp_nt->backlight)
+                put_device(&sharp_nt->backlight->dev);
+}
+
+static int sharp_nt_panel_probe(struct mipi_dsi_device *dsi)
+{
+        struct sharp_nt_panel *sharp_nt;
+        int ret;
+
+        dsi->lanes = 2;
+        dsi->format = MIPI_DSI_FMT_RGB888;
+        dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
+                        MIPI_DSI_MODE_VIDEO_HSE |
+                        MIPI_DSI_CLOCK_NON_CONTINUOUS |
+                        MIPI_DSI_MODE_EOT_PACKET;
+
+        sharp_nt = devm_kzalloc(&dsi->dev, sizeof(*sharp_nt), GFP_KERNEL);
+        if (!sharp_nt)
+                return -ENOMEM;
+
+        mipi_dsi_set_drvdata(dsi, sharp_nt);
+
+        sharp_nt->dsi = dsi;
+
+        ret = sharp_nt_panel_add(sharp_nt);
+        if (ret < 0)
+                return ret;
+
+        return mipi_dsi_attach(dsi);
+}
+
+static int sharp_nt_panel_remove(struct mipi_dsi_device *dsi)
+{
+        struct sharp_nt_panel *sharp_nt = mipi_dsi_get_drvdata(dsi);
+        int ret;
+
+        ret = sharp_nt_panel_disable(&sharp_nt->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(&sharp_nt->base);
+        sharp_nt_panel_del(sharp_nt);
+
+        return 0;
+}
+
+static void sharp_nt_panel_shutdown(struct mipi_dsi_device *dsi)
+{
+        struct sharp_nt_panel *sharp_nt = mipi_dsi_get_drvdata(dsi);
+
+        sharp_nt_panel_disable(&sharp_nt->base);
+}
+
+static const struct of_device_id sharp_nt_of_match[] = {
+        { .compatible = "sharp,ls043t1le01-qhd", },
+        { }
+};
+MODULE_DEVICE_TABLE(of, sharp_nt_of_match);
+
+static struct mipi_dsi_driver sharp_nt_panel_driver = {
+        .driver = {
+                .name = "panel-sharp-ls043t1le01-qhd",
+                .of_match_table = sharp_nt_of_match,
+        },
+        .probe = sharp_nt_panel_probe,
+        .remove = sharp_nt_panel_remove,
+        .shutdown = sharp_nt_panel_shutdown,
+};
+module_mipi_dsi_driver(sharp_nt_panel_driver);
+
+MODULE_AUTHOR("Werner Johansson <werner.johansson@sonymobile.com>");
+MODULE_DESCRIPTION("Sharp LS043T1LE01 NT35565-based qHD (540x960) video mode panel driver");
+MODULE_LICENSE("GPL v2");