drm/hisilicon/hibmc: Add support for display engine

Add display engine function, crtc/plane is initialized here.
Signed-off-by: Rongrong Zou <zourongrong@gmail.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Xinliang Liu <xinliang.liu@linaro.org>
Acked-by: Sean Paul <seanpaul@chromium.org>

drivers/gpu/drm/hisilicon/hibmc/Makefile

 ccflags-y := -Iinclude/drm
-hibmc-drm-y := hibmc_drm_drv.o hibmc_drm_fbdev.o hibmc_ttm.o
+hibmc-drm-y := hibmc_drm_drv.o hibmc_drm_de.o hibmc_drm_fbdev.o hibmc_ttm.o
 
 obj-$(CONFIG_DRM_HISI_HIBMC) += hibmc-drm.o

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c

+/* Hisilicon Hibmc SoC drm driver
+ *
+ * Based on the bochs drm driver.
+ *
+ * Copyright (c) 2016 Huawei Limited.
+ *
+ * Author:
+ *	Rongrong Zou <zourongrong@huawei.com>
+ *	Rongrong Zou <zourongrong@gmail.com>
+ *	Jianhua Li <lijianhua@huawei.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_plane_helper.h>
+
+#include "hibmc_drm_drv.h"
+#include "hibmc_drm_regs.h"
+
+struct hibmc_display_panel_pll {
+	unsigned long M;
+	unsigned long N;
+	unsigned long OD;
+	unsigned long POD;
+};
+
+struct hibmc_dislay_pll_config {
+	unsigned long hdisplay;
+	unsigned long vdisplay;
+	u32 pll1_config_value;
+	u32 pll2_config_value;
+};
+
+static const struct hibmc_dislay_pll_config hibmc_pll_table[] = {
+	{800, 600, CRT_PLL1_HS_40MHZ, CRT_PLL2_HS_40MHZ},
+	{1024, 768, CRT_PLL1_HS_65MHZ, CRT_PLL2_HS_65MHZ},
+	{1152, 864, CRT_PLL1_HS_80MHZ_1152, CRT_PLL2_HS_80MHZ},
+	{1280, 768, CRT_PLL1_HS_80MHZ, CRT_PLL2_HS_80MHZ},
+	{1280, 720, CRT_PLL1_HS_74MHZ, CRT_PLL2_HS_74MHZ},
+	{1280, 960, CRT_PLL1_HS_108MHZ, CRT_PLL2_HS_108MHZ},
+	{1280, 1024, CRT_PLL1_HS_108MHZ, CRT_PLL2_HS_108MHZ},
+	{1600, 1200, CRT_PLL1_HS_162MHZ, CRT_PLL2_HS_162MHZ},
+	{1920, 1080, CRT_PLL1_HS_148MHZ, CRT_PLL2_HS_148MHZ},
+	{1920, 1200, CRT_PLL1_HS_193MHZ, CRT_PLL2_HS_193MHZ},
+};
+
+#define PADDING(align, data) (((data) + (align) - 1) & (~((align) - 1)))
+
+static int hibmc_plane_atomic_check(struct drm_plane *plane,
+				    struct drm_plane_state *state)
+{
+	struct drm_framebuffer *fb = state->fb;
+	struct drm_crtc *crtc = state->crtc;
+	struct drm_crtc_state *crtc_state;
+	u32 src_w = state->src_w >> 16;
+	u32 src_h = state->src_h >> 16;
+
+	if (!crtc || !fb)
+		return 0;
+
+	crtc_state = drm_atomic_get_crtc_state(state->state, crtc);
+	if (IS_ERR(crtc_state))
+		return PTR_ERR(crtc_state);
+
+	if (src_w != state->crtc_w || src_h != state->crtc_h) {
+		DRM_DEBUG_ATOMIC("scale not support\n");
+		return -EINVAL;
+	}
+
+	if (state->crtc_x < 0 || state->crtc_y < 0) {
+		DRM_DEBUG_ATOMIC("crtc_x/y of drm_plane state is invalid\n");
+		return -EINVAL;
+	}
+
+	if (state->crtc_x + state->crtc_w >
+	    crtc_state->adjusted_mode.hdisplay ||
+	    state->crtc_y + state->crtc_h >
+	    crtc_state->adjusted_mode.vdisplay) {
+		DRM_DEBUG_ATOMIC("visible portion of plane is invalid\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void hibmc_plane_atomic_update(struct drm_plane *plane,
+				      struct drm_plane_state *old_state)
+{
+	struct drm_plane_state	*state	= plane->state;
+	u32 reg;
+	int ret;
+	u64 gpu_addr = 0;
+	unsigned int line_l;
+	struct hibmc_drm_private *priv = plane->dev->dev_private;
+	struct hibmc_framebuffer *hibmc_fb;
+	struct hibmc_bo *bo;
+
+	if (!state->fb)
+		return;
+
+	hibmc_fb = to_hibmc_framebuffer(state->fb);
+	bo = gem_to_hibmc_bo(hibmc_fb->obj);
+	ret = ttm_bo_reserve(&bo->bo, true, false, NULL);
+	if (ret) {
+		DRM_ERROR("failed to reserve ttm_bo: %d", ret);
+		return;
+	}
+
+	ret = hibmc_bo_pin(bo, TTM_PL_FLAG_VRAM, &gpu_addr);
+	ttm_bo_unreserve(&bo->bo);
+	if (ret) {
+		DRM_ERROR("failed to pin hibmc_bo: %d", ret);
+		return;
+	}
+
+	writel(gpu_addr, priv->mmio + HIBMC_CRT_FB_ADDRESS);
+
+	reg = state->fb->width * (state->fb->bits_per_pixel / 8);
+	/* now line_pad is 16 */
+	reg = PADDING(16, reg);
+
+	line_l = state->fb->width * state->fb->bits_per_pixel / 8;
+	line_l = PADDING(16, line_l);
+	writel(HIBMC_FIELD(HIBMC_CRT_FB_WIDTH_WIDTH, reg) |
+	       HIBMC_FIELD(HIBMC_CRT_FB_WIDTH_OFFS, line_l),
+	       priv->mmio + HIBMC_CRT_FB_WIDTH);
+
+	/* SET PIXEL FORMAT */
+	reg = readl(priv->mmio + HIBMC_CRT_DISP_CTL);
+	reg &= ~HIBMC_CRT_DISP_CTL_FORMAT_MASK;
+	reg |= HIBMC_FIELD(HIBMC_CRT_DISP_CTL_FORMAT,
+			   state->fb->bits_per_pixel / 16);
+	writel(reg, priv->mmio + HIBMC_CRT_DISP_CTL);
+}
+
+static const u32 channel_formats1[] = {
+	DRM_FORMAT_RGB565, DRM_FORMAT_BGR565, DRM_FORMAT_RGB888,
+	DRM_FORMAT_BGR888, DRM_FORMAT_XRGB8888, DRM_FORMAT_XBGR8888,
+	DRM_FORMAT_RGBA8888, DRM_FORMAT_BGRA8888, DRM_FORMAT_ARGB8888,
+	DRM_FORMAT_ABGR8888
+};
+
+static struct drm_plane_funcs hibmc_plane_funcs = {
+	.update_plane	= drm_atomic_helper_update_plane,
+	.disable_plane	= drm_atomic_helper_disable_plane,
+	.set_property = drm_atomic_helper_plane_set_property,
+	.destroy = drm_plane_cleanup,
+	.reset = drm_atomic_helper_plane_reset,
+	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
+};
+
+static const struct drm_plane_helper_funcs hibmc_plane_helper_funcs = {
+	.atomic_check = hibmc_plane_atomic_check,
+	.atomic_update = hibmc_plane_atomic_update,
+};
+
+static struct drm_plane *hibmc_plane_init(struct hibmc_drm_private *priv)
+{
+	struct drm_device *dev = priv->dev;
+	struct drm_plane *plane;
+	int ret = 0;
+
+	plane = devm_kzalloc(dev->dev, sizeof(*plane), GFP_KERNEL);
+	if (!plane) {
+		DRM_ERROR("failed to alloc memory when init plane\n");
+		return ERR_PTR(-ENOMEM);
+	}
+	/*
+	 * plane init
+	 * TODO: Now only support primary plane, overlay planes
+	 * need to do.
+	 */
+	ret = drm_universal_plane_init(dev, plane, 1, &hibmc_plane_funcs,
+				       channel_formats1,
+				       ARRAY_SIZE(channel_formats1),
+				       DRM_PLANE_TYPE_PRIMARY,
+				       NULL);
+	if (ret) {
+		DRM_ERROR("failed to init plane: %d\n", ret);
+		return ERR_PTR(ret);
+	}
+
+	drm_plane_helper_add(plane, &hibmc_plane_helper_funcs);
+	return plane;
+}
+
+static void hibmc_crtc_enable(struct drm_crtc *crtc)
+{
+	unsigned int reg;
+	struct hibmc_drm_private *priv = crtc->dev->dev_private;
+
+	hibmc_set_power_mode(priv, HIBMC_PW_MODE_CTL_MODE_MODE0);
+
+	/* Enable display power gate & LOCALMEM power gate*/
+	reg = readl(priv->mmio + HIBMC_CURRENT_GATE);
+	reg &= ~HIBMC_CURR_GATE_LOCALMEM_MASK;
+	reg &= ~HIBMC_CURR_GATE_DISPLAY_MASK;
+	reg |= HIBMC_CURR_GATE_LOCALMEM(1);
+	reg |= HIBMC_CURR_GATE_DISPLAY(1);
+	hibmc_set_current_gate(priv, reg);
+	drm_crtc_vblank_on(crtc);
+}
+
+static void hibmc_crtc_disable(struct drm_crtc *crtc)
+{
+	unsigned int reg;
+	struct hibmc_drm_private *priv = crtc->dev->dev_private;
+
+	drm_crtc_vblank_off(crtc);
+
+	hibmc_set_power_mode(priv, HIBMC_PW_MODE_CTL_MODE_SLEEP);
+
+	/* Enable display power gate & LOCALMEM power gate*/
+	reg = readl(priv->mmio + HIBMC_CURRENT_GATE);
+	reg &= ~HIBMC_CURR_GATE_LOCALMEM_MASK;
+	reg &= ~HIBMC_CURR_GATE_DISPLAY_MASK;
+	reg |= HIBMC_CURR_GATE_LOCALMEM(0);
+	reg |= HIBMC_CURR_GATE_DISPLAY(0);
+	hibmc_set_current_gate(priv, reg);
+}
+
+static unsigned int format_pll_reg(void)
+{
+	unsigned int pllreg = 0;
+	struct hibmc_display_panel_pll pll = {0};
+
+	/*
+	 * Note that all PLL's have the same format. Here,
+	 * we just use Panel PLL parameter to work out the bit
+	 * fields in the register.On returning a 32 bit number, the value can
+	 * be applied to any PLL in the calling function.
+	 */
+	pllreg |= HIBMC_FIELD(HIBMC_PLL_CTRL_BYPASS, 0);
+	pllreg |= HIBMC_FIELD(HIBMC_PLL_CTRL_POWER, 1);
+	pllreg |= HIBMC_FIELD(HIBMC_PLL_CTRL_INPUT, 0);
+	pllreg |= HIBMC_FIELD(HIBMC_PLL_CTRL_POD, pll.POD);
+	pllreg |= HIBMC_FIELD(HIBMC_PLL_CTRL_OD, pll.OD);
+	pllreg |= HIBMC_FIELD(HIBMC_PLL_CTRL_N, pll.N);
+	pllreg |= HIBMC_FIELD(HIBMC_PLL_CTRL_M, pll.M);
+
+	return pllreg;
+}
+
+static void set_vclock_hisilicon(struct drm_device *dev, unsigned long pll)
+{
+	u32 val;
+	struct hibmc_drm_private *priv = dev->dev_private;
+
+	val = readl(priv->mmio + CRT_PLL1_HS);
+	val &= ~(CRT_PLL1_HS_OUTER_BYPASS(1));
+	writel(val, priv->mmio + CRT_PLL1_HS);
+
+	val = CRT_PLL1_HS_INTER_BYPASS(1) | CRT_PLL1_HS_POWERON(1);
+	writel(val, priv->mmio + CRT_PLL1_HS);
+
+	writel(pll, priv->mmio + CRT_PLL1_HS);
+
+	usleep_range(1000, 2000);
+
+	val = pll & ~(CRT_PLL1_HS_POWERON(1));
+	writel(val, priv->mmio + CRT_PLL1_HS);
+
+	usleep_range(1000, 2000);
+
+	val &= ~(CRT_PLL1_HS_INTER_BYPASS(1));
+	writel(val, priv->mmio + CRT_PLL1_HS);
+
+	usleep_range(1000, 2000);
+
+	val |= CRT_PLL1_HS_OUTER_BYPASS(1);
+	writel(val, priv->mmio + CRT_PLL1_HS);
+}
+
+static void get_pll_config(unsigned long x, unsigned long y,
+			   u32 *pll1, u32 *pll2)
+{
+	int i;
+	int count = ARRAY_SIZE(hibmc_pll_table);
+
+	for (i = 0; i < count; i++) {
+		if (hibmc_pll_table[i].hdisplay == x &&
+		    hibmc_pll_table[i].vdisplay == y) {
+			*pll1 = hibmc_pll_table[i].pll1_config_value;
+			*pll2 = hibmc_pll_table[i].pll2_config_value;
+			return;
+		}
+	}
+
+	/* if found none, we use default value */
+	*pll1 = CRT_PLL1_HS_25MHZ;
+	*pll2 = CRT_PLL2_HS_25MHZ;
+}
+
+/*
+ * This function takes care the extra registers and bit fields required to
+ * setup a mode in board.
+ * Explanation about Display Control register:
+ * FPGA only supports 7 predefined pixel clocks, and clock select is
+ * in bit 4:0 of new register 0x802a8.
+ */
+static unsigned int display_ctrl_adjust(struct drm_device *dev,
+					struct drm_display_mode *mode,
+					unsigned int ctrl)
+{
+	unsigned long x, y;
+	u32 pll1; /* bit[31:0] of PLL */
+	u32 pll2; /* bit[63:32] of PLL */
+	struct hibmc_drm_private *priv = dev->dev_private;
+
+	x = mode->hdisplay;
+	y = mode->vdisplay;
+
+	get_pll_config(x, y, &pll1, &pll2);
+	writel(pll2, priv->mmio + CRT_PLL2_HS);
+	set_vclock_hisilicon(dev, pll1);
+
+	/*
+	 * Hisilicon has to set up the top-left and bottom-right
+	 * registers as well.
+	 * Note that normal chip only use those two register for
+	 * auto-centering mode.
+	 */
+	writel(HIBMC_FIELD(HIBMC_CRT_AUTO_CENTERING_TL_TOP, 0) |
+	       HIBMC_FIELD(HIBMC_CRT_AUTO_CENTERING_TL_LEFT, 0),
+	       priv->mmio + HIBMC_CRT_AUTO_CENTERING_TL);
+
+	writel(HIBMC_FIELD(HIBMC_CRT_AUTO_CENTERING_BR_BOTTOM, y - 1) |
+	       HIBMC_FIELD(HIBMC_CRT_AUTO_CENTERING_BR_RIGHT, x - 1),
+	       priv->mmio + HIBMC_CRT_AUTO_CENTERING_BR);
+
+	/*
+	 * Assume common fields in ctrl have been properly set before
+	 * calling this function.
+	 * This function only sets the extra fields in ctrl.
+	 */
+
+	/* Set bit 25 of display controller: Select CRT or VGA clock */
+	ctrl &= ~HIBMC_CRT_DISP_CTL_CRTSELECT_MASK;
+	ctrl &= ~HIBMC_CRT_DISP_CTL_CLOCK_PHASE_MASK;
+
+	ctrl |= HIBMC_CRT_DISP_CTL_CRTSELECT(HIBMC_CRTSELECT_CRT);
+
+	/* clock_phase_polarity is 0 */
+	ctrl |= HIBMC_CRT_DISP_CTL_CLOCK_PHASE(0);
+
+	writel(ctrl, priv->mmio + HIBMC_CRT_DISP_CTL);
+
+	return ctrl;
+}
+
+static void hibmc_crtc_mode_set_nofb(struct drm_crtc *crtc)
+{
+	unsigned int val;
+	struct drm_display_mode *mode = &crtc->state->mode;
+	struct drm_device *dev = crtc->dev;
+	struct hibmc_drm_private *priv = dev->dev_private;
+	int width = mode->hsync_end - mode->hsync_start;
+	int height = mode->vsync_end - mode->vsync_start;
+
+	writel(format_pll_reg(), priv->mmio + HIBMC_CRT_PLL_CTRL);
+	writel(HIBMC_FIELD(HIBMC_CRT_HORZ_TOTAL_TOTAL, mode->htotal - 1) |
+	       HIBMC_FIELD(HIBMC_CRT_HORZ_TOTAL_DISP_END, mode->hdisplay - 1),
+	       priv->mmio + HIBMC_CRT_HORZ_TOTAL);
+
+	writel(HIBMC_FIELD(HIBMC_CRT_HORZ_SYNC_WIDTH, width) |
+	       HIBMC_FIELD(HIBMC_CRT_HORZ_SYNC_START, mode->hsync_start - 1),
+	       priv->mmio + HIBMC_CRT_HORZ_SYNC);
+
+	writel(HIBMC_FIELD(HIBMC_CRT_VERT_TOTAL_TOTAL, mode->vtotal - 1) |
+	       HIBMC_FIELD(HIBMC_CRT_VERT_TOTAL_DISP_END, mode->vdisplay - 1),
+	       priv->mmio + HIBMC_CRT_VERT_TOTAL);
+
+	writel(HIBMC_FIELD(HIBMC_CRT_VERT_SYNC_HEIGHT, height) |
+	       HIBMC_FIELD(HIBMC_CRT_VERT_SYNC_START, mode->vsync_start - 1),
+	       priv->mmio + HIBMC_CRT_VERT_SYNC);
+
+	val = HIBMC_FIELD(HIBMC_CRT_DISP_CTL_VSYNC_PHASE, 0);
+	val |= HIBMC_FIELD(HIBMC_CRT_DISP_CTL_HSYNC_PHASE, 0);
+	val |= HIBMC_CRT_DISP_CTL_TIMING(1);
+	val |= HIBMC_CRT_DISP_CTL_PLANE(1);
+
+	display_ctrl_adjust(dev, mode, val);
+}
+
+static void hibmc_crtc_atomic_begin(struct drm_crtc *crtc,
+				    struct drm_crtc_state *old_state)
+{
+	unsigned int reg;
+	struct drm_device *dev = crtc->dev;
+	struct hibmc_drm_private *priv = dev->dev_private;
+
+	hibmc_set_power_mode(priv, HIBMC_PW_MODE_CTL_MODE_MODE0);
+
+	/* Enable display power gate & LOCALMEM power gate*/
+	reg = readl(priv->mmio + HIBMC_CURRENT_GATE);
+	reg &= ~HIBMC_CURR_GATE_DISPLAY_MASK;
+	reg &= ~HIBMC_CURR_GATE_LOCALMEM_MASK;
+	reg |= HIBMC_CURR_GATE_DISPLAY(1);
+	reg |= HIBMC_CURR_GATE_LOCALMEM(1);
+	hibmc_set_current_gate(priv, reg);
+
+	/* We can add more initialization as needed. */
+}
+
+static void hibmc_crtc_atomic_flush(struct drm_crtc *crtc,
+				    struct drm_crtc_state *old_state)
+
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&crtc->dev->event_lock, flags);
+	if (crtc->state->event)
+		drm_crtc_send_vblank_event(crtc, crtc->state->event);
+	crtc->state->event = NULL;
+	spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
+}
+
+static const struct drm_crtc_funcs hibmc_crtc_funcs = {
+	.page_flip = drm_atomic_helper_page_flip,
+	.set_config = drm_atomic_helper_set_config,
+	.destroy = drm_crtc_cleanup,
+	.reset = drm_atomic_helper_crtc_reset,
+	.atomic_duplicate_state =  drm_atomic_helper_crtc_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+};
+
+static const struct drm_crtc_helper_funcs hibmc_crtc_helper_funcs = {
+	.enable		= hibmc_crtc_enable,
+	.disable	= hibmc_crtc_disable,
+	.mode_set_nofb	= hibmc_crtc_mode_set_nofb,
+	.atomic_begin	= hibmc_crtc_atomic_begin,
+	.atomic_flush	= hibmc_crtc_atomic_flush,
+};
+
+int hibmc_de_init(struct hibmc_drm_private *priv)
+{
+	struct drm_device *dev = priv->dev;
+	struct drm_crtc *crtc;
+	struct drm_plane *plane;
+	int ret;
+
+	plane = hibmc_plane_init(priv);
+	if (IS_ERR(plane)) {
+		DRM_ERROR("failed to create plane: %ld\n", PTR_ERR(plane));
+		return PTR_ERR(plane);
+	}
+
+	crtc = devm_kzalloc(dev->dev, sizeof(*crtc), GFP_KERNEL);
+	if (!crtc) {
+		DRM_ERROR("failed to alloc memory when init crtc\n");
+		return -ENOMEM;
+	}
+
+	ret = drm_crtc_init_with_planes(dev, crtc, plane,
+					NULL, &hibmc_crtc_funcs, NULL);
+	if (ret) {
+		DRM_ERROR("failed to init crtc: %d\n", ret);
+		return ret;
+	}
+
+	ret = drm_mode_crtc_set_gamma_size(crtc, 256);
+	if (ret) {
+		DRM_ERROR("failed to set gamma size: %d\n", ret);
+		return ret;
+	}
+	drm_crtc_helper_add(crtc, &hibmc_crtc_helper_funcs);
+
+	return 0;
+}

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c

@@ -19,6 +19,9 @@
 #include <linux/console.h>
 #include <linux/module.h>
 
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+
 #include "hibmc_drm_drv.h"
 #include "hibmc_drm_regs.h"
 
@@ -44,7 +47,8 @@ static void hibmc_disable_vblank(struct drm_device *dev, unsigned int pipe)
 }
 
 static struct drm_driver hibmc_driver = {
-	.driver_features	= DRIVER_GEM,
+	.driver_features	= DRIVER_GEM | DRIVER_MODESET |
+				  DRIVER_ATOMIC,
 	.fops			= &hibmc_fops,
 	.name			= "hibmc",
 	.date			= "20160828",
@@ -62,11 +66,31 @@ static struct drm_driver hibmc_driver = {
 
 static int hibmc_pm_suspend(struct device *dev)
 {
+	struct pci_dev *pdev = to_pci_dev(dev);
+	struct drm_device *drm_dev = pci_get_drvdata(pdev);
+	struct hibmc_drm_private *priv = drm_dev->dev_private;
+
+	drm_kms_helper_poll_disable(drm_dev);
+	priv->suspend_state = drm_atomic_helper_suspend(drm_dev);
+	if (IS_ERR(priv->suspend_state)) {
+		DRM_ERROR("drm_atomic_helper_suspend failed: %ld\n",
+			  PTR_ERR(priv->suspend_state));
+		drm_kms_helper_poll_enable(drm_dev);
+		return PTR_ERR(priv->suspend_state);
+	}
+
 	return 0;
 }
 
 static int hibmc_pm_resume(struct device *dev)
 {
+	struct pci_dev *pdev = to_pci_dev(dev);
+	struct drm_device *drm_dev = pci_get_drvdata(pdev);
+	struct hibmc_drm_private *priv = drm_dev->dev_private;
+
+	drm_atomic_helper_resume(drm_dev, priv->suspend_state);
+	drm_kms_helper_poll_enable(drm_dev);
+
 	return 0;
 }
 
@@ -75,6 +99,41 @@ static const struct dev_pm_ops hibmc_pm_ops = {
 				hibmc_pm_resume)
 };
 
+static int hibmc_kms_init(struct hibmc_drm_private *priv)
+{
+	int ret;
+
+	drm_mode_config_init(priv->dev);
+	priv->mode_config_initialized = true;
+
+	priv->dev->mode_config.min_width = 0;
+	priv->dev->mode_config.min_height = 0;
+	priv->dev->mode_config.max_width = 1920;
+	priv->dev->mode_config.max_height = 1440;
+
+	priv->dev->mode_config.fb_base = priv->fb_base;
+	priv->dev->mode_config.preferred_depth = 24;
+	priv->dev->mode_config.prefer_shadow = 0;
+
+	priv->dev->mode_config.funcs = (void *)&hibmc_mode_funcs;
+
+	ret = hibmc_de_init(priv);
+	if (ret) {
+		DRM_ERROR("failed to init de: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void hibmc_kms_fini(struct hibmc_drm_private *priv)
+{
+	if (priv->mode_config_initialized) {
+		drm_mode_config_cleanup(priv->dev);
+		priv->mode_config_initialized = false;
+	}
+}
+
 /*
  * It can operate in one of three modes: 0, 1 or Sleep.
  */
@@ -203,6 +262,7 @@ static int hibmc_unload(struct drm_device *dev)
 	struct hibmc_drm_private *priv = dev->dev_private;
 
 	hibmc_fbdev_fini(priv);
+	hibmc_kms_fini(priv);
 	hibmc_mm_fini(priv);
 	dev->dev_private = NULL;
 	return 0;
@@ -229,6 +289,13 @@ static int hibmc_load(struct drm_device *dev)
 	if (ret)
 		goto err;
 
+	ret = hibmc_kms_init(priv);
+	if (ret)
+		goto err;
+
+	/* reset all the states of crtc/plane/encoder/connector */
+	drm_mode_config_reset(dev);
+
 	ret = hibmc_fbdev_init(priv);
 	if (ret) {
 		DRM_ERROR("failed to initialize fbdev: %d\n", ret);

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h

@@ -20,6 +20,7 @@
 #define HIBMC_DRM_DRV_H
 
 #include <drm/drmP.h>
+#include <drm/drm_atomic.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_gem.h>
 #include <drm/ttm/ttm_bo_driver.h>
@@ -44,6 +45,8 @@ struct hibmc_drm_private {
 
 	/* drm */
 	struct drm_device  *dev;
+	bool mode_config_initialized;
+	struct drm_atomic_state *suspend_state;
 
 	/* ttm */
 	struct drm_global_reference mem_global_ref;
@@ -82,6 +85,7 @@ void hibmc_set_power_mode(struct hibmc_drm_private *priv,
 void hibmc_set_current_gate(struct hibmc_drm_private *priv,
 			    unsigned int gate);
 
+int hibmc_de_init(struct hibmc_drm_private *priv);
 int hibmc_fbdev_init(struct hibmc_drm_private *priv);
 void hibmc_fbdev_fini(struct hibmc_drm_private *priv);
 
@@ -103,4 +107,6 @@ int hibmc_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
 			   u32 handle, u64 *offset);
 int hibmc_mmap(struct file *filp, struct vm_area_struct *vma);
 
+extern const struct drm_mode_config_funcs hibmc_mode_funcs;
+
 #endif

drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c

@@ -550,3 +550,9 @@ hibmc_user_framebuffer_create(struct drm_device *dev,
 	}
 	return &hibmc_fb->fb;
 }
+
+const struct drm_mode_config_funcs hibmc_mode_funcs = {
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+	.fb_create = hibmc_user_framebuffer_create,
+};