drm/panel: Add Panasonic VVX10F034N00 MIPI DSI panel

This adds support for the Panasonic panel found in some Xperia Z2
tablets.

Signed-off-by: Werner Johansson <werner.johansson@sonymobile.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

3 files changed, 345 insertions, 0 deletions

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 7d4704b1292b..15a396014a59 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -31,6 +31,16 @@ config DRM_PANEL_LG_LG4573
           Say Y here if you want to enable support for LG4573 RGB panel.
           To compile this driver as a module, choose M here.
 
+config DRM_PANEL_PANASONIC_VVX10F034N00
+        tristate "Panasonic VVX10F034N00 1920x1200 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 Panasonic VVX10F034N00
+          WUXGA (1920x1200) Novatek NT1397-based DSI panel as found in some
+          Xperia Z2 tablets
+
 config DRM_PANEL_SAMSUNG_S6E8AA0
         tristate "Samsung S6E8AA0 DSI video mode panel"
         depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index d0f016dd7ddb..053287a72825 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -1,5 +1,6 @@
 obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o
 obj-$(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
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o
 obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
diff --git a/drivers/gpu/drm/panel/panel-panasonic-vvx10f034n00.c b/drivers/gpu/drm/panel/panel-panasonic-vvx10f034n00.c
new file mode 100644
index 000000000000..7f915f706fa6
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-panasonic-vvx10f034n00.c
@@ -0,0 +1,334 @@
+/*
+ * 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/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>
+
+/*
+ * When power is turned off to this panel a minimum off time of 500ms has to be
+ * observed before powering back on as there's no external reset pin. Keep
+ * track of earliest wakeup time and delay subsequent prepare call accordingly
+ */
+#define MIN_POFF_MS (500)
+
+struct wuxga_nt_panel {
+        struct drm_panel base;
+        struct mipi_dsi_device *dsi;
+
+        struct backlight_device *backlight;
+        struct regulator *supply;
+
+        bool prepared;
+        bool enabled;
+
+        ktime_t earliest_wake;
+
+        const struct drm_display_mode *mode;
+};
+
+static inline struct wuxga_nt_panel *to_wuxga_nt_panel(struct drm_panel *panel)
+{
+        return container_of(panel, struct wuxga_nt_panel, base);
+}
+
+static int wuxga_nt_panel_on(struct wuxga_nt_panel *wuxga_nt)
+{
+        struct mipi_dsi_device *dsi = wuxga_nt->dsi;
+        int ret;
+
+        ret = mipi_dsi_turn_on_peripheral(dsi);
+        if (ret < 0)
+                return ret;
+
+        return 0;
+}
+
+static int wuxga_nt_panel_disable(struct drm_panel *panel)
+{
+        struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
+
+        if (!wuxga_nt->enabled)
+                return 0;
+
+        mipi_dsi_shutdown_peripheral(wuxga_nt->dsi);
+
+        if (wuxga_nt->backlight) {
+                wuxga_nt->backlight->props.power = FB_BLANK_POWERDOWN;
+                wuxga_nt->backlight->props.state |= BL_CORE_FBBLANK;
+                backlight_update_status(wuxga_nt->backlight);
+        }
+
+        wuxga_nt->enabled = false;
+
+        return 0;
+}
+
+static int wuxga_nt_panel_unprepare(struct drm_panel *panel)
+{
+        struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
+
+        if (!wuxga_nt->prepared)
+                return 0;
+
+        regulator_disable(wuxga_nt->supply);
+        wuxga_nt->earliest_wake = ktime_add_ms(ktime_get_real(), MIN_POFF_MS);
+        wuxga_nt->prepared = false;
+
+        return 0;
+}
+
+static int wuxga_nt_panel_prepare(struct drm_panel *panel)
+{
+        struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
+        int ret;
+        s64 enablewait;
+
+        if (wuxga_nt->prepared)
+                return 0;
+
+        /*
+         * If the user re-enabled the panel before the required off-time then
+         * we need to wait the remaining period before re-enabling regulator
+         */
+        enablewait = ktime_ms_delta(wuxga_nt->earliest_wake, ktime_get_real());
+
+        /* Sanity check, this should never happen */
+        if (enablewait > MIN_POFF_MS)
+                enablewait = MIN_POFF_MS;
+
+        if (enablewait > 0)
+                msleep(enablewait);
+
+        ret = regulator_enable(wuxga_nt->supply);
+        if (ret < 0)
+                return ret;
+
+        /*
+         * A minimum delay of 250ms is required after power-up until commands
+         * can be sent
+         */
+        msleep(250);
+
+        ret = wuxga_nt_panel_on(wuxga_nt);
+        if (ret < 0) {
+                dev_err(panel->dev, "failed to set panel on: %d\n", ret);
+                goto poweroff;
+        }
+
+        wuxga_nt->prepared = true;
+
+        return 0;
+
+poweroff:
+        regulator_disable(wuxga_nt->supply);
+
+        return ret;
+}
+
+static int wuxga_nt_panel_enable(struct drm_panel *panel)
+{
+        struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
+
+        if (wuxga_nt->enabled)
+                return 0;
+
+        if (wuxga_nt->backlight) {
+                wuxga_nt->backlight->props.power = FB_BLANK_UNBLANK;
+                wuxga_nt->backlight->props.state &= ~BL_CORE_FBBLANK;
+                backlight_update_status(wuxga_nt->backlight);
+        }
+
+        wuxga_nt->enabled = true;
+
+        return 0;
+}
+
+static const struct drm_display_mode default_mode = {
+        .clock = 164402,
+        .hdisplay = 1920,
+        .hsync_start = 1920 + 152,
+        .hsync_end = 1920 + 152 + 52,
+        .htotal = 1920 + 152 + 52 + 20,
+        .vdisplay = 1200,
+        .vsync_start = 1200 + 24,
+        .vsync_end = 1200 + 24 + 6,
+        .vtotal = 1200 + 24 + 6 + 48,
+        .vrefresh = 60,
+};
+
+static int wuxga_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 = 217;
+        panel->connector->display_info.height_mm = 136;
+
+        return 1;
+}
+
+static const struct drm_panel_funcs wuxga_nt_panel_funcs = {
+        .disable = wuxga_nt_panel_disable,
+        .unprepare = wuxga_nt_panel_unprepare,
+        .prepare = wuxga_nt_panel_prepare,
+        .enable = wuxga_nt_panel_enable,
+        .get_modes = wuxga_nt_panel_get_modes,
+};
+
+static const struct of_device_id wuxga_nt_of_match[] = {
+        { .compatible = "panasonic,vvx10f034n00", },
+        { }
+};
+MODULE_DEVICE_TABLE(of, wuxga_nt_of_match);
+
+static int wuxga_nt_panel_add(struct wuxga_nt_panel *wuxga_nt)
+{
+        struct device *dev = &wuxga_nt->dsi->dev;
+        struct device_node *np;
+        int ret;
+
+        wuxga_nt->mode = &default_mode;
+
+        wuxga_nt->supply = devm_regulator_get(dev, "power");
+        if (IS_ERR(wuxga_nt->supply))
+                return PTR_ERR(wuxga_nt->supply);
+
+        np = of_parse_phandle(dev->of_node, "backlight", 0);
+        if (np) {
+                wuxga_nt->backlight = of_find_backlight_by_node(np);
+                of_node_put(np);
+
+                if (!wuxga_nt->backlight)
+                        return -EPROBE_DEFER;
+        }
+
+        drm_panel_init(&wuxga_nt->base);
+        wuxga_nt->base.funcs = &wuxga_nt_panel_funcs;
+        wuxga_nt->base.dev = &wuxga_nt->dsi->dev;
+
+        ret = drm_panel_add(&wuxga_nt->base);
+        if (ret < 0)
+                goto put_backlight;
+
+        return 0;
+
+put_backlight:
+        if (wuxga_nt->backlight)
+                put_device(&wuxga_nt->backlight->dev);
+
+        return ret;
+}
+
+static void wuxga_nt_panel_del(struct wuxga_nt_panel *wuxga_nt)
+{
+        if (wuxga_nt->base.dev)
+                drm_panel_remove(&wuxga_nt->base);
+
+        if (wuxga_nt->backlight)
+                put_device(&wuxga_nt->backlight->dev);
+}
+
+static int wuxga_nt_panel_probe(struct mipi_dsi_device *dsi)
+{
+        struct wuxga_nt_panel *wuxga_nt;
+        int ret;
+
+        dsi->lanes = 4;
+        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_LPM;
+
+        wuxga_nt = devm_kzalloc(&dsi->dev, sizeof(*wuxga_nt), GFP_KERNEL);
+        if (!wuxga_nt)
+                return -ENOMEM;
+
+        mipi_dsi_set_drvdata(dsi, wuxga_nt);
+
+        wuxga_nt->dsi = dsi;
+
+        ret = wuxga_nt_panel_add(wuxga_nt);
+        if (ret < 0)
+                return ret;
+
+        return mipi_dsi_attach(dsi);
+}
+
+static int wuxga_nt_panel_remove(struct mipi_dsi_device *dsi)
+{
+        struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);
+        int ret;
+
+        ret = wuxga_nt_panel_disable(&wuxga_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(&wuxga_nt->base);
+        wuxga_nt_panel_del(wuxga_nt);
+
+        return 0;
+}
+
+static void wuxga_nt_panel_shutdown(struct mipi_dsi_device *dsi)
+{
+        struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);
+
+        wuxga_nt_panel_disable(&wuxga_nt->base);
+}
+
+static struct mipi_dsi_driver wuxga_nt_panel_driver = {
+        .driver = {
+                .name = "panel-panasonic-vvx10f034n00",
+                .of_match_table = wuxga_nt_of_match,
+        },
+        .probe = wuxga_nt_panel_probe,
+        .remove = wuxga_nt_panel_remove,
+        .shutdown = wuxga_nt_panel_shutdown,
+};
+module_mipi_dsi_driver(wuxga_nt_panel_driver);
+
+MODULE_AUTHOR("Werner Johansson <werner.johansson@sonymobile.com>");
+MODULE_DESCRIPTION("Panasonic VVX10F034N00 Novatek NT1397-based WUXGA (1920x1200) video mode panel driver");
+MODULE_LICENSE("GPL v2");