[PATCH 3/9] drm: add driver for panels used by the Rockchip DRM

@@ -5,7 +5,8 @@
 ccflags-y := -Iinclude/drm -Idrivers/gpu/drm/rockchip
 
 rockchipdrm-y := rockchip_drm_drv.o rockchip_drm_gem.o \
-		rockchip_drm_fb.o rockchip_drm_fbdev.o
+		rockchip_drm_fb.o rockchip_drm_fbdev.o \
+		rockchip_panel.o
 
 obj-$(CONFIG_DRM_ROCKCHIP_CONNECTOR) += rockchip_drm_connector.o
 obj-$(CONFIG_DRM_ROCKCHIP_LCDC) += rockchip_drm_lcdc.o

@@ -0,0 +1,297 @@
+/*
+ * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
+ * Author:mark yao <mark.yao-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
+ *
+ * based on panel-simple.c
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#include <linux/gpio.h>
+#include <linux/module.h>
+#include <linux/of_gpio.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <video/of_videomode.h>
+#include <video/videomode.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_panel.h>
+
+#include "rockchip_drm_drv.h"
+
+/* TODO: convert to gpiod_*() API once it's been merged */
+#define GPIO_ACTIVE_LOW	(1 << 0)
+
+struct pwr_gpio {
+	struct list_head head;
+	unsigned long enable_gpio_flags;
+	int enable_gpio;
+};
+
+struct rockchip_panel {
+	struct drm_panel base;
+	bool enabled;
+
+	struct drm_display_mode mode;
+	struct rockchip_panel_special priv;
+
+	struct list_head pwrlist;
+};
+
+static inline struct rockchip_panel *to_rockchip_panel(struct drm_panel *panel)
+{
+	return container_of(panel, struct rockchip_panel, base);
+}
+
+static int rockchip_panel_disable(struct drm_panel *panel)
+{
+	struct rockchip_panel *p = to_rockchip_panel(panel);
+	struct pwr_gpio *pwr;
+	struct list_head *pos;
+
+	if (!p->enabled)
+		return 0;
+
+	list_for_each(pos, &p->pwrlist) {
+		pwr = list_entry(pos, struct pwr_gpio, head);
+		if (gpio_is_valid(pwr->enable_gpio)) {
+			if (pwr->enable_gpio_flags & GPIO_ACTIVE_LOW)
+				gpio_set_value(pwr->enable_gpio, 1);
+			else
+				gpio_set_value(pwr->enable_gpio, 0);
+		}
+	}
+
+	p->enabled = false;
+
+	return 0;
+}
+
+static int rockchip_panel_enable(struct drm_panel *panel)
+{
+	struct rockchip_panel *p = to_rockchip_panel(panel);
+	struct pwr_gpio *pwr;
+	struct list_head *pos;
+
+	if (p->enabled)
+		return 0;
+
+	list_for_each(pos, &p->pwrlist) {
+		pwr = list_entry(pos, struct pwr_gpio, head);
+		if (gpio_is_valid(pwr->enable_gpio)) {
+			if (pwr->enable_gpio_flags & GPIO_ACTIVE_LOW)
+				gpio_set_value(pwr->enable_gpio, 0);
+			else
+				gpio_set_value(pwr->enable_gpio, 1);
+		}
+	}
+
+	p->enabled = true;
+
+	return 0;
+}
+
+static int rockchip_panel_get_modes(struct drm_panel *panel)
+{
+	struct rockchip_panel *p = to_rockchip_panel(panel);
+	struct drm_device *drm = panel->drm;
+	struct drm_connector *connector = panel->connector;
+	const struct drm_display_mode *m = &p->mode;
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_duplicate(drm, m);
+	if (!mode) {
+		dev_err(drm->dev, "failed to add mode %ux%u@%u\n",
+			m->hdisplay, m->vdisplay, m->vrefresh);
+		return 0;
+	}
+
+	drm_mode_set_name(mode);
+	drm_mode_probed_add(connector, mode);
+
+	return 1;
+}
+
+static const struct drm_panel_funcs rockchip_panel_funcs = {
+	.disable = rockchip_panel_disable,
+	.enable = rockchip_panel_enable,
+	.get_modes = rockchip_panel_get_modes,
+};
+
+static int rockchip_name_to_face(const char *s)
+{
+	if (!s)
+		return 0;
+
+	if (strncmp(s, "r8g8b8", 6) == 0)
+		return ROCKCHIP_OUTFACE_P888;
+	else if (strncmp(s, "r6g6b6", 6) == 0)
+		return ROCKCHIP_OUTFACE_P666;
+	else if (strncmp(s, "r5g6b5", 6) == 0)
+		return ROCKCHIP_OUTFACE_P565;
+
+	DRM_ERROR("unsupport display output face[%s]\n", s);
+
+	return 0;
+}
+
+static int rockchip_panel_probe(struct platform_device *pdev)
+{
+	struct rockchip_panel *panel;
+	struct device *dev = &pdev->dev;
+	struct rockchip_panel_special *priv;
+	struct device_node *dn = dev->of_node;
+	struct device_node *np;
+	enum of_gpio_flags flags;
+	struct videomode vm;
+	const char *name;
+	struct pwr_gpio *pwr;
+	struct list_head *pos;
+	int value;
+	int err, i;
+	int num_gpio;
+
+	panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
+	if (!panel)
+		return -ENOMEM;
+
+	priv = &panel->priv;
+
+	INIT_LIST_HEAD(&panel->pwrlist);
+	num_gpio = of_gpio_named_count(dn, "enable-gpios");
+	for (i = 0; i < num_gpio; i++) {
+		pwr = kmalloc(sizeof(*pwr), GFP_KERNEL);
+		pwr->enable_gpio = of_get_named_gpio_flags(dn,
+							   "enable-gpios", i,
+							   &flags);
+		if (flags & OF_GPIO_ACTIVE_LOW)
+			pwr->enable_gpio_flags |= GPIO_ACTIVE_LOW;
+
+		if (gpio_is_valid(pwr->enable_gpio)) {
+			err = gpio_request(pwr->enable_gpio, NULL);
+			if (err < 0) {
+				dev_err(dev, "failed to request GPIO#%u: %d\n",
+					pwr->enable_gpio, err);
+				gpio_free(pwr->enable_gpio);
+				kfree(pwr);
+				continue;
+			}
+			value = (pwr->enable_gpio_flags & GPIO_ACTIVE_LOW) != 0;
+			err = gpio_direction_output(pwr->enable_gpio, value);
+			if (err < 0) {
+				dev_err(dev, "failed to setup GPIO%u: %d\n",
+					pwr->enable_gpio, err);
+				gpio_free(pwr->enable_gpio);
+				kfree(pwr);
+				continue;
+			}
+
+			list_add_tail(&pwr->head, &panel->pwrlist);
+		}
+	}
+
+	if (of_property_read_bool(dn, "color-swap-rb"))
+		priv->color_swap = ROCKCHIP_COLOR_SWAP_RB;
+
+	if (of_property_read_bool(dn, "color-swap-rg"))
+		priv->color_swap |= ROCKCHIP_COLOR_SWAP_RG;
+
+	if (of_property_read_bool(dn, "color-swap-gb"))
+		priv->color_swap |= ROCKCHIP_COLOR_SWAP_GB;
+
+	if (of_property_read_string(dn, "rockchip,output-face", &name))
+		/* default set it as RGB screen */
+		priv->out_face = ROCKCHIP_OUTFACE_P666;
+	else
+		priv->out_face = rockchip_name_to_face(name);
+
+	priv->pwr18 = of_property_read_bool(dn, "lcd-vcc18");
+	priv->dither = of_property_read_bool(dn, "output-dither");
+
+	np = of_get_child_by_name(dn, "display-timings");
+	if (!np) {
+		DRM_ERROR("can't find display timings\n");
+		return 0;
+	}
+
+	of_node_put(np);
+	memset(&vm, 0, sizeof(vm));
+
+	err = of_get_videomode(dn, &vm, 0);
+	if (err < 0)
+		return err;
+
+	drm_display_mode_from_videomode(&vm, &panel->mode);
+	panel->mode.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+
+	priv->flags = vm.flags;
+	panel->mode.private = (void *)priv;
+
+	drm_panel_init(&panel->base);
+	panel->base.dev = dev;
+	panel->base.funcs = &rockchip_panel_funcs;
+
+	err = drm_panel_add(&panel->base);
+	if (err < 0)
+		goto free_gpio;
+
+	dev_set_drvdata(dev, panel);
+
+	return 0;
+
+free_gpio:
+	list_for_each(pos, &panel->pwrlist) {
+		pwr = list_entry(pos, struct pwr_gpio, head);
+		if (gpio_is_valid(pwr->enable_gpio))
+			gpio_free(pwr->enable_gpio);
+		kfree(pwr);
+	}
+	return err;
+}
+
+static const struct of_device_id platform_of_match[] = {
+	{
+		.compatible = "rockchip,panel",
+	}, {
+		/* sentinel */
+	}
+};
+MODULE_DEVICE_TABLE(of, platform_of_match);
+
+static int rockchip_panel_remove(struct platform_device *pdev)
+{
+	struct rockchip_panel *panel = dev_get_drvdata(&pdev->dev);
+	struct pwr_gpio *pwr;
+	struct list_head *pos;
+
+	drm_panel_detach(&panel->base);
+	drm_panel_remove(&panel->base);
+
+	list_for_each(pos, &panel->pwrlist) {
+		pwr = list_entry(pos, struct pwr_gpio, head);
+		if (gpio_is_valid(pwr->enable_gpio))
+			gpio_free(pwr->enable_gpio);
+		kfree(pwr);
+	}
+
+	return 0;
+}
+
+struct platform_driver rockchip_panel_platform_driver = {
+	.driver = {
+		.name = "rockchip,panel",
+		.owner = THIS_MODULE,
+		.of_match_table = platform_of_match,
+	},
+	.probe = rockchip_panel_probe,
+	.remove = rockchip_panel_remove,
+};