drivers/staging/imx-drm/ipuv3-crtc.c - linux - Git at Google

 /*
  * i.MX IPUv3 Graphics driver
  *
  * Copyright (C) 2011 Sascha Hauer, Pengutronix
  *
  * 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.
  * 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, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  * MA 02110-1301, USA.
  */
 #include <linux/module.h>
 #include <linux/export.h>
 #include <linux/device.h>
 #include <linux/platform_device.h>
 #include <drm/drmP.h>
 #include <drm/drm_crtc_helper.h>
 #include <linux/fb.h>
 #include <linux/clk.h>
 #include <linux/errno.h>
 #include <drm/drm_gem_cma_helper.h>
 #include <drm/drm_fb_cma_helper.h>

 #include "ipu-v3/imx-ipu-v3.h"
 #include "imx-drm.h"
 #include "ipuv3-plane.h"

 #define DRIVER_DESC		"i.MX IPUv3 Graphics"

 struct ipu_crtc {
 	struct device		*dev;
 	struct drm_crtc		base;
 	struct imx_drm_crtc	*imx_crtc;

 	/* plane[0] is the full plane, plane[1] is the partial plane */
 	struct ipu_plane	*plane[2];

 	struct ipu_dc		*dc;
 	struct ipu_di		*di;
 	int			enabled;
 	struct drm_pending_vblank_event *page_flip_event;
 	struct drm_framebuffer	*newfb;
 	int			irq;
 	u32			interface_pix_fmt;
 	unsigned long		di_clkflags;
 	int			di_hsync_pin;
 	int			di_vsync_pin;
 };

 #define to_ipu_crtc(x) container_of(x, struct ipu_crtc, base)

 static void ipu_fb_enable(struct ipu_crtc *ipu_crtc)
 {
 	if (ipu_crtc->enabled)
 		return;

 	ipu_di_enable(ipu_crtc->di);
 	ipu_dc_enable_channel(ipu_crtc->dc);
 	ipu_plane_enable(ipu_crtc->plane[0]);

 	ipu_crtc->enabled = 1;
 }

 static void ipu_fb_disable(struct ipu_crtc *ipu_crtc)
 {
 	if (!ipu_crtc->enabled)
 		return;

 	ipu_plane_disable(ipu_crtc->plane[0]);
 	ipu_dc_disable_channel(ipu_crtc->dc);
 	ipu_di_disable(ipu_crtc->di);

 	ipu_crtc->enabled = 0;
 }

 static void ipu_crtc_dpms(struct drm_crtc *crtc, int mode)
 {
 	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);

 	dev_dbg(ipu_crtc->dev, "%s mode: %d\n", __func__, mode);

 	switch (mode) {
 	case DRM_MODE_DPMS_ON:
 		ipu_fb_enable(ipu_crtc);
 		break;
 	case DRM_MODE_DPMS_STANDBY:
 	case DRM_MODE_DPMS_SUSPEND:
 	case DRM_MODE_DPMS_OFF:
 		ipu_fb_disable(ipu_crtc);
 		break;
 	}
 }

 static int ipu_page_flip(struct drm_crtc *crtc,
 		struct drm_framebuffer *fb,
 		struct drm_pending_vblank_event *event,
 		uint32_t page_flip_flags)
 {
 	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 	int ret;

 	if (ipu_crtc->newfb)
 		return -EBUSY;

 	ret = imx_drm_crtc_vblank_get(ipu_crtc->imx_crtc);
 	if (ret) {
 		dev_dbg(ipu_crtc->dev, "failed to acquire vblank counter\n");
 		list_del(&event->base.link);

 		return ret;
 	}

 	ipu_crtc->newfb = fb;
 	ipu_crtc->page_flip_event = event;
 	crtc->fb = fb;

 	return 0;
 }

 static const struct drm_crtc_funcs ipu_crtc_funcs = {
 	.set_config = drm_crtc_helper_set_config,
 	.destroy = drm_crtc_cleanup,
 	.page_flip = ipu_page_flip,
 };

 static int ipu_crtc_mode_set(struct drm_crtc *crtc,
 			       struct drm_display_mode *orig_mode,
 			       struct drm_display_mode *mode,
 			       int x, int y,
 			       struct drm_framebuffer *old_fb)
 {
 	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 	int ret;
 	struct ipu_di_signal_cfg sig_cfg = {};
 	u32 out_pixel_fmt;

 	dev_dbg(ipu_crtc->dev, "%s: mode->hdisplay: %d\n", __func__,
 			mode->hdisplay);
 	dev_dbg(ipu_crtc->dev, "%s: mode->vdisplay: %d\n", __func__,
 			mode->vdisplay);

 	out_pixel_fmt = ipu_crtc->interface_pix_fmt;

 	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 		sig_cfg.interlaced = 1;
 	if (mode->flags & DRM_MODE_FLAG_PHSYNC)
 		sig_cfg.Hsync_pol = 1;
 	if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 		sig_cfg.Vsync_pol = 1;

 	sig_cfg.enable_pol = 1;
 	sig_cfg.clk_pol = 1;
 	sig_cfg.width = mode->hdisplay;
 	sig_cfg.height = mode->vdisplay;
 	sig_cfg.pixel_fmt = out_pixel_fmt;
 	sig_cfg.h_start_width = mode->htotal - mode->hsync_end;
 	sig_cfg.h_sync_width = mode->hsync_end - mode->hsync_start;
 	sig_cfg.h_end_width = mode->hsync_start - mode->hdisplay;

 	sig_cfg.v_start_width = mode->vtotal - mode->vsync_end;
 	sig_cfg.v_sync_width = mode->vsync_end - mode->vsync_start;
 	sig_cfg.v_end_width = mode->vsync_start - mode->vdisplay;
 	sig_cfg.pixelclock = mode->clock * 1000;
 	sig_cfg.clkflags = ipu_crtc->di_clkflags;

 	sig_cfg.v_to_h_sync = 0;

 	sig_cfg.hsync_pin = ipu_crtc->di_hsync_pin;
 	sig_cfg.vsync_pin = ipu_crtc->di_vsync_pin;

 	ret = ipu_dc_init_sync(ipu_crtc->dc, ipu_crtc->di, sig_cfg.interlaced,
 			out_pixel_fmt, mode->hdisplay);
 	if (ret) {
 		dev_err(ipu_crtc->dev,
 				"initializing display controller failed with %d\n",
 				ret);
 		return ret;
 	}

 	ret = ipu_di_init_sync_panel(ipu_crtc->di, &sig_cfg);
 	if (ret) {
 		dev_err(ipu_crtc->dev,
 				"initializing panel failed with %d\n", ret);
 		return ret;
 	}

 	return ipu_plane_mode_set(ipu_crtc->plane[0], crtc, mode, crtc->fb,
 				  0, 0, mode->hdisplay, mode->vdisplay,
 				  x, y, mode->hdisplay, mode->vdisplay);
 }

 static void ipu_crtc_handle_pageflip(struct ipu_crtc *ipu_crtc)
 {
 	unsigned long flags;
 	struct drm_device *drm = ipu_crtc->base.dev;

 	spin_lock_irqsave(&drm->event_lock, flags);
 	if (ipu_crtc->page_flip_event)
 		drm_send_vblank_event(drm, -1, ipu_crtc->page_flip_event);
 	ipu_crtc->page_flip_event = NULL;
 	imx_drm_crtc_vblank_put(ipu_crtc->imx_crtc);
 	spin_unlock_irqrestore(&drm->event_lock, flags);
 }

 static irqreturn_t ipu_irq_handler(int irq, void *dev_id)
 {
 	struct ipu_crtc *ipu_crtc = dev_id;

 	imx_drm_handle_vblank(ipu_crtc->imx_crtc);

 	if (ipu_crtc->newfb) {
 		ipu_crtc->newfb = NULL;
 		ipu_plane_set_base(ipu_crtc->plane[0], ipu_crtc->base.fb,
 				ipu_crtc->plane[0]->x, ipu_crtc->plane[0]->y);
 		ipu_crtc_handle_pageflip(ipu_crtc);
 	}

 	return IRQ_HANDLED;
 }

 static bool ipu_crtc_mode_fixup(struct drm_crtc *crtc,
 				  const struct drm_display_mode *mode,
 				  struct drm_display_mode *adjusted_mode)
 {
 	return true;
 }

 static void ipu_crtc_prepare(struct drm_crtc *crtc)
 {
 	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);

 	ipu_fb_disable(ipu_crtc);
 }

 static void ipu_crtc_commit(struct drm_crtc *crtc)
 {
 	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);

 	ipu_fb_enable(ipu_crtc);
 }

 static struct drm_crtc_helper_funcs ipu_helper_funcs = {
 	.dpms = ipu_crtc_dpms,
 	.mode_fixup = ipu_crtc_mode_fixup,
 	.mode_set = ipu_crtc_mode_set,
 	.prepare = ipu_crtc_prepare,
 	.commit = ipu_crtc_commit,
 };

 static int ipu_enable_vblank(struct drm_crtc *crtc)
 {
 	return 0;
 }

 static void ipu_disable_vblank(struct drm_crtc *crtc)
 {
 	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);

 	ipu_crtc->page_flip_event = NULL;
 	ipu_crtc->newfb = NULL;
 }

 static int ipu_set_interface_pix_fmt(struct drm_crtc *crtc, u32 encoder_type,
 		u32 pixfmt, int hsync_pin, int vsync_pin)
 {
 	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);

 	ipu_crtc->interface_pix_fmt = pixfmt;
 	ipu_crtc->di_hsync_pin = hsync_pin;
 	ipu_crtc->di_vsync_pin = vsync_pin;

 	switch (encoder_type) {
 	case DRM_MODE_ENCODER_DAC:
 	case DRM_MODE_ENCODER_TVDAC:
 	case DRM_MODE_ENCODER_LVDS:
 		ipu_crtc->di_clkflags = IPU_DI_CLKMODE_SYNC |
 			IPU_DI_CLKMODE_EXT;
 		break;
 	case DRM_MODE_ENCODER_NONE:
 		ipu_crtc->di_clkflags = 0;
 		break;
 	}

 	return 0;
 }

 static const struct imx_drm_crtc_helper_funcs ipu_crtc_helper_funcs = {
 	.enable_vblank = ipu_enable_vblank,
 	.disable_vblank = ipu_disable_vblank,
 	.set_interface_pix_fmt = ipu_set_interface_pix_fmt,
 	.crtc_funcs = &ipu_crtc_funcs,
 	.crtc_helper_funcs = &ipu_helper_funcs,
 };

 static void ipu_put_resources(struct ipu_crtc *ipu_crtc)
 {
 	if (!IS_ERR_OR_NULL(ipu_crtc->dc))
 		ipu_dc_put(ipu_crtc->dc);
 	if (!IS_ERR_OR_NULL(ipu_crtc->di))
 		ipu_di_put(ipu_crtc->di);
 }

 static int ipu_get_resources(struct ipu_crtc *ipu_crtc,
 		struct ipu_client_platformdata *pdata)
 {
 	struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 	int ret;

 	ipu_crtc->dc = ipu_dc_get(ipu, pdata->dc);
 	if (IS_ERR(ipu_crtc->dc)) {
 		ret = PTR_ERR(ipu_crtc->dc);
 		goto err_out;
 	}

 	ipu_crtc->di = ipu_di_get(ipu, pdata->di);
 	if (IS_ERR(ipu_crtc->di)) {
 		ret = PTR_ERR(ipu_crtc->di);
 		goto err_out;
 	}

 	return 0;
 err_out:
 	ipu_put_resources(ipu_crtc);

 	return ret;
 }

 static int ipu_crtc_init(struct ipu_crtc *ipu_crtc,
 		struct ipu_client_platformdata *pdata)
 {
 	struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 	int dp = -EINVAL;
 	int ret;
 	int id;

 	ret = ipu_get_resources(ipu_crtc, pdata);
 	if (ret) {
 		dev_err(ipu_crtc->dev, "getting resources failed with %d.\n",
 				ret);
 		return ret;
 	}

 	ret = imx_drm_add_crtc(&ipu_crtc->base,
 			&ipu_crtc->imx_crtc,
 			&ipu_crtc_helper_funcs, THIS_MODULE,
 			ipu_crtc->dev->parent->of_node, pdata->di);
 	if (ret) {
 		dev_err(ipu_crtc->dev, "adding crtc failed with %d.\n", ret);
 		goto err_put_resources;
 	}

 	if (pdata->dp >= 0)
 		dp = IPU_DP_FLOW_SYNC_BG;
 	id = imx_drm_crtc_id(ipu_crtc->imx_crtc);
 	ipu_crtc->plane[0] = ipu_plane_init(ipu_crtc->base.dev, ipu,
 					    pdata->dma[0], dp, BIT(id), true);
 	ret = ipu_plane_get_resources(ipu_crtc->plane[0]);
 	if (ret) {
 		dev_err(ipu_crtc->dev, "getting plane 0 resources failed with %d.\n",
 			ret);
 		goto err_remove_crtc;
 	}

 	/* If this crtc is using the DP, add an overlay plane */
 	if (pdata->dp >= 0 && pdata->dma[1] > 0) {
 		ipu_crtc->plane[1] = ipu_plane_init(ipu_crtc->base.dev, ipu,
 						    pdata->dma[1],
 						    IPU_DP_FLOW_SYNC_FG,
 						    BIT(id), false);
 		if (IS_ERR(ipu_crtc->plane[1]))
 			ipu_crtc->plane[1] = NULL;
 	}

 	ipu_crtc->irq = ipu_plane_irq(ipu_crtc->plane[0]);
 	ret = devm_request_irq(ipu_crtc->dev, ipu_crtc->irq, ipu_irq_handler, 0,
 			"imx_drm", ipu_crtc);
 	if (ret < 0) {
 		dev_err(ipu_crtc->dev, "irq request failed with %d.\n", ret);
 		goto err_put_plane_res;
 	}

 	return 0;

 err_put_plane_res:
 	ipu_plane_put_resources(ipu_crtc->plane[0]);
 err_remove_crtc:
 	imx_drm_remove_crtc(ipu_crtc->imx_crtc);
 err_put_resources:
 	ipu_put_resources(ipu_crtc);

 	return ret;
 }

 static int ipu_drm_probe(struct platform_device *pdev)
 {
 	struct ipu_client_platformdata *pdata = pdev->dev.platform_data;
 	struct ipu_crtc *ipu_crtc;
 	int ret;

 	if (!pdata)
 		return -EINVAL;

 	ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 	if (ret)
 		return ret;

 	ipu_crtc = devm_kzalloc(&pdev->dev, sizeof(*ipu_crtc), GFP_KERNEL);
 	if (!ipu_crtc)
 		return -ENOMEM;

 	ipu_crtc->dev = &pdev->dev;

 	ret = ipu_crtc_init(ipu_crtc, pdata);
 	if (ret)
 		return ret;

 	platform_set_drvdata(pdev, ipu_crtc);

 	return 0;
 }

 static int ipu_drm_remove(struct platform_device *pdev)
 {
 	struct ipu_crtc *ipu_crtc = platform_get_drvdata(pdev);

 	imx_drm_remove_crtc(ipu_crtc->imx_crtc);

 	ipu_plane_put_resources(ipu_crtc->plane[0]);
 	ipu_put_resources(ipu_crtc);

 	return 0;
 }

 static struct platform_driver ipu_drm_driver = {
 	.driver = {
 		.name = "imx-ipuv3-crtc",
 	},
 	.probe = ipu_drm_probe,
 	.remove = ipu_drm_remove,
 };
 module_platform_driver(ipu_drm_driver);

 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:imx-ipuv3-crtc");
	/*
	* i.MX IPUv3 Graphics driver
	*
	* Copyright (C) 2011 Sascha Hauer, Pengutronix
	*
	* 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.
	* 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, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
	* MA 02110-1301, USA.
	*/
	#include <linux/module.h>
	#include <linux/export.h>
	#include <linux/device.h>
	#include <linux/platform_device.h>
	#include <drm/drmP.h>
	#include <drm/drm_crtc_helper.h>
	#include <linux/fb.h>
	#include <linux/clk.h>
	#include <linux/errno.h>
	#include <drm/drm_gem_cma_helper.h>
	#include <drm/drm_fb_cma_helper.h>

	#include "ipu-v3/imx-ipu-v3.h"
	#include "imx-drm.h"
	#include "ipuv3-plane.h"

	#define DRIVER_DESC "i.MX IPUv3 Graphics"

	struct ipu_crtc {
	struct device *dev;
	struct drm_crtc base;
	struct imx_drm_crtc *imx_crtc;

	/* plane[0] is the full plane, plane[1] is the partial plane */
	struct ipu_plane *plane[2];

	struct ipu_dc *dc;
	struct ipu_di *di;
	int enabled;
	struct drm_pending_vblank_event *page_flip_event;
	struct drm_framebuffer *newfb;
	int irq;
	u32 interface_pix_fmt;
	unsigned long di_clkflags;
	int di_hsync_pin;
	int di_vsync_pin;
	};

	#define to_ipu_crtc(x) container_of(x, struct ipu_crtc, base)

	static void ipu_fb_enable(struct ipu_crtc *ipu_crtc)
	{
	if (ipu_crtc->enabled)
	return;

	ipu_di_enable(ipu_crtc->di);
	ipu_dc_enable_channel(ipu_crtc->dc);
	ipu_plane_enable(ipu_crtc->plane[0]);

	ipu_crtc->enabled = 1;
	}

	static void ipu_fb_disable(struct ipu_crtc *ipu_crtc)
	{
	if (!ipu_crtc->enabled)
	return;

	ipu_plane_disable(ipu_crtc->plane[0]);
	ipu_dc_disable_channel(ipu_crtc->dc);
	ipu_di_disable(ipu_crtc->di);

	ipu_crtc->enabled = 0;
	}

	static void ipu_crtc_dpms(struct drm_crtc *crtc, int mode)
	{
	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);

	dev_dbg(ipu_crtc->dev, "%s mode: %d\n", __func__, mode);

	switch (mode) {
	case DRM_MODE_DPMS_ON:
	ipu_fb_enable(ipu_crtc);
	break;
	case DRM_MODE_DPMS_STANDBY:
	case DRM_MODE_DPMS_SUSPEND:
	case DRM_MODE_DPMS_OFF:
	ipu_fb_disable(ipu_crtc);
	break;
	}
	}

	static int ipu_page_flip(struct drm_crtc *crtc,
	struct drm_framebuffer *fb,
	struct drm_pending_vblank_event *event,
	uint32_t page_flip_flags)
	{
	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
	int ret;

	if (ipu_crtc->newfb)
	return -EBUSY;

	ret = imx_drm_crtc_vblank_get(ipu_crtc->imx_crtc);
	if (ret) {
	dev_dbg(ipu_crtc->dev, "failed to acquire vblank counter\n");
	list_del(&event->base.link);

	return ret;
	}

	ipu_crtc->newfb = fb;
	ipu_crtc->page_flip_event = event;
	crtc->fb = fb;

	return 0;
	}

	static const struct drm_crtc_funcs ipu_crtc_funcs = {
	.set_config = drm_crtc_helper_set_config,
	.destroy = drm_crtc_cleanup,
	.page_flip = ipu_page_flip,
	};

	static int ipu_crtc_mode_set(struct drm_crtc *crtc,
	struct drm_display_mode *orig_mode,
	struct drm_display_mode *mode,
	int x, int y,
	struct drm_framebuffer *old_fb)
	{
	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
	int ret;
	struct ipu_di_signal_cfg sig_cfg = {};
	u32 out_pixel_fmt;

	dev_dbg(ipu_crtc->dev, "%s: mode->hdisplay: %d\n", __func__,
	mode->hdisplay);
	dev_dbg(ipu_crtc->dev, "%s: mode->vdisplay: %d\n", __func__,
	mode->vdisplay);

	out_pixel_fmt = ipu_crtc->interface_pix_fmt;

	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
	sig_cfg.interlaced = 1;
	if (mode->flags & DRM_MODE_FLAG_PHSYNC)
	sig_cfg.Hsync_pol = 1;
	if (mode->flags & DRM_MODE_FLAG_PVSYNC)
	sig_cfg.Vsync_pol = 1;

	sig_cfg.enable_pol = 1;
	sig_cfg.clk_pol = 1;
	sig_cfg.width = mode->hdisplay;
	sig_cfg.height = mode->vdisplay;
	sig_cfg.pixel_fmt = out_pixel_fmt;
	sig_cfg.h_start_width = mode->htotal - mode->hsync_end;
	sig_cfg.h_sync_width = mode->hsync_end - mode->hsync_start;
	sig_cfg.h_end_width = mode->hsync_start - mode->hdisplay;

	sig_cfg.v_start_width = mode->vtotal - mode->vsync_end;
	sig_cfg.v_sync_width = mode->vsync_end - mode->vsync_start;
	sig_cfg.v_end_width = mode->vsync_start - mode->vdisplay;
	sig_cfg.pixelclock = mode->clock * 1000;
	sig_cfg.clkflags = ipu_crtc->di_clkflags;

	sig_cfg.v_to_h_sync = 0;

	sig_cfg.hsync_pin = ipu_crtc->di_hsync_pin;
	sig_cfg.vsync_pin = ipu_crtc->di_vsync_pin;

	ret = ipu_dc_init_sync(ipu_crtc->dc, ipu_crtc->di, sig_cfg.interlaced,
	out_pixel_fmt, mode->hdisplay);
	if (ret) {
	dev_err(ipu_crtc->dev,
	"initializing display controller failed with %d\n",
	ret);
	return ret;
	}

	ret = ipu_di_init_sync_panel(ipu_crtc->di, &sig_cfg);
	if (ret) {
	dev_err(ipu_crtc->dev,
	"initializing panel failed with %d\n", ret);
	return ret;
	}

	return ipu_plane_mode_set(ipu_crtc->plane[0], crtc, mode, crtc->fb,
	0, 0, mode->hdisplay, mode->vdisplay,
	x, y, mode->hdisplay, mode->vdisplay);
	}

	static void ipu_crtc_handle_pageflip(struct ipu_crtc *ipu_crtc)
	{
	unsigned long flags;
	struct drm_device *drm = ipu_crtc->base.dev;

	spin_lock_irqsave(&drm->event_lock, flags);
	if (ipu_crtc->page_flip_event)
	drm_send_vblank_event(drm, -1, ipu_crtc->page_flip_event);
	ipu_crtc->page_flip_event = NULL;
	imx_drm_crtc_vblank_put(ipu_crtc->imx_crtc);
	spin_unlock_irqrestore(&drm->event_lock, flags);
	}

	static irqreturn_t ipu_irq_handler(int irq, void *dev_id)
	{
	struct ipu_crtc *ipu_crtc = dev_id;

	imx_drm_handle_vblank(ipu_crtc->imx_crtc);

	if (ipu_crtc->newfb) {
	ipu_crtc->newfb = NULL;
	ipu_plane_set_base(ipu_crtc->plane[0], ipu_crtc->base.fb,
	ipu_crtc->plane[0]->x, ipu_crtc->plane[0]->y);
	ipu_crtc_handle_pageflip(ipu_crtc);
	}

	return IRQ_HANDLED;
	}

	static bool ipu_crtc_mode_fixup(struct drm_crtc *crtc,
	const struct drm_display_mode *mode,
	struct drm_display_mode *adjusted_mode)
	{
	return true;
	}

	static void ipu_crtc_prepare(struct drm_crtc *crtc)
	{
	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);

	ipu_fb_disable(ipu_crtc);
	}

	static void ipu_crtc_commit(struct drm_crtc *crtc)
	{
	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);

	ipu_fb_enable(ipu_crtc);
	}

	static struct drm_crtc_helper_funcs ipu_helper_funcs = {
	.dpms = ipu_crtc_dpms,
	.mode_fixup = ipu_crtc_mode_fixup,
	.mode_set = ipu_crtc_mode_set,
	.prepare = ipu_crtc_prepare,
	.commit = ipu_crtc_commit,
	};

	static int ipu_enable_vblank(struct drm_crtc *crtc)
	{
	return 0;
	}

	static void ipu_disable_vblank(struct drm_crtc *crtc)
	{
	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);

	ipu_crtc->page_flip_event = NULL;
	ipu_crtc->newfb = NULL;
	}

	static int ipu_set_interface_pix_fmt(struct drm_crtc *crtc, u32 encoder_type,
	u32 pixfmt, int hsync_pin, int vsync_pin)
	{
	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);

	ipu_crtc->interface_pix_fmt = pixfmt;
	ipu_crtc->di_hsync_pin = hsync_pin;
	ipu_crtc->di_vsync_pin = vsync_pin;

	switch (encoder_type) {
	case DRM_MODE_ENCODER_DAC:
	case DRM_MODE_ENCODER_TVDAC:
	case DRM_MODE_ENCODER_LVDS:
	ipu_crtc->di_clkflags = IPU_DI_CLKMODE_SYNC \|
	IPU_DI_CLKMODE_EXT;
	break;
	case DRM_MODE_ENCODER_NONE:
	ipu_crtc->di_clkflags = 0;
	break;
	}

	return 0;
	}

	static const struct imx_drm_crtc_helper_funcs ipu_crtc_helper_funcs = {
	.enable_vblank = ipu_enable_vblank,
	.disable_vblank = ipu_disable_vblank,
	.set_interface_pix_fmt = ipu_set_interface_pix_fmt,
	.crtc_funcs = &ipu_crtc_funcs,
	.crtc_helper_funcs = &ipu_helper_funcs,
	};

	static void ipu_put_resources(struct ipu_crtc *ipu_crtc)
	{
	if (!IS_ERR_OR_NULL(ipu_crtc->dc))
	ipu_dc_put(ipu_crtc->dc);
	if (!IS_ERR_OR_NULL(ipu_crtc->di))
	ipu_di_put(ipu_crtc->di);
	}

	static int ipu_get_resources(struct ipu_crtc *ipu_crtc,
	struct ipu_client_platformdata *pdata)
	{
	struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
	int ret;

	ipu_crtc->dc = ipu_dc_get(ipu, pdata->dc);
	if (IS_ERR(ipu_crtc->dc)) {
	ret = PTR_ERR(ipu_crtc->dc);
	goto err_out;
	}

	ipu_crtc->di = ipu_di_get(ipu, pdata->di);
	if (IS_ERR(ipu_crtc->di)) {
	ret = PTR_ERR(ipu_crtc->di);
	goto err_out;
	}

	return 0;
	err_out:
	ipu_put_resources(ipu_crtc);

	return ret;
	}

	static int ipu_crtc_init(struct ipu_crtc *ipu_crtc,
	struct ipu_client_platformdata *pdata)
	{
	struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
	int dp = -EINVAL;
	int ret;
	int id;

	ret = ipu_get_resources(ipu_crtc, pdata);
	if (ret) {
	dev_err(ipu_crtc->dev, "getting resources failed with %d.\n",
	ret);
	return ret;
	}

	ret = imx_drm_add_crtc(&ipu_crtc->base,
	&ipu_crtc->imx_crtc,
	&ipu_crtc_helper_funcs, THIS_MODULE,
	ipu_crtc->dev->parent->of_node, pdata->di);
	if (ret) {
	dev_err(ipu_crtc->dev, "adding crtc failed with %d.\n", ret);
	goto err_put_resources;
	}

	if (pdata->dp >= 0)
	dp = IPU_DP_FLOW_SYNC_BG;
	id = imx_drm_crtc_id(ipu_crtc->imx_crtc);
	ipu_crtc->plane[0] = ipu_plane_init(ipu_crtc->base.dev, ipu,
	pdata->dma[0], dp, BIT(id), true);
	ret = ipu_plane_get_resources(ipu_crtc->plane[0]);
	if (ret) {
	dev_err(ipu_crtc->dev, "getting plane 0 resources failed with %d.\n",
	ret);
	goto err_remove_crtc;
	}

	/* If this crtc is using the DP, add an overlay plane */
	if (pdata->dp >= 0 && pdata->dma[1] > 0) {
	ipu_crtc->plane[1] = ipu_plane_init(ipu_crtc->base.dev, ipu,
	pdata->dma[1],
	IPU_DP_FLOW_SYNC_FG,
	BIT(id), false);
	if (IS_ERR(ipu_crtc->plane[1]))
	ipu_crtc->plane[1] = NULL;
	}

	ipu_crtc->irq = ipu_plane_irq(ipu_crtc->plane[0]);
	ret = devm_request_irq(ipu_crtc->dev, ipu_crtc->irq, ipu_irq_handler, 0,
	"imx_drm", ipu_crtc);
	if (ret < 0) {
	dev_err(ipu_crtc->dev, "irq request failed with %d.\n", ret);
	goto err_put_plane_res;
	}

	return 0;

	err_put_plane_res:
	ipu_plane_put_resources(ipu_crtc->plane[0]);
	err_remove_crtc:
	imx_drm_remove_crtc(ipu_crtc->imx_crtc);
	err_put_resources:
	ipu_put_resources(ipu_crtc);

	return ret;
	}

	static int ipu_drm_probe(struct platform_device *pdev)
	{
	struct ipu_client_platformdata *pdata = pdev->dev.platform_data;
	struct ipu_crtc *ipu_crtc;
	int ret;

	if (!pdata)
	return -EINVAL;

	ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
	if (ret)
	return ret;

	ipu_crtc = devm_kzalloc(&pdev->dev, sizeof(*ipu_crtc), GFP_KERNEL);
	if (!ipu_crtc)
	return -ENOMEM;

	ipu_crtc->dev = &pdev->dev;

	ret = ipu_crtc_init(ipu_crtc, pdata);
	if (ret)
	return ret;

	platform_set_drvdata(pdev, ipu_crtc);

	return 0;
	}

	static int ipu_drm_remove(struct platform_device *pdev)
	{
	struct ipu_crtc *ipu_crtc = platform_get_drvdata(pdev);

	imx_drm_remove_crtc(ipu_crtc->imx_crtc);

	ipu_plane_put_resources(ipu_crtc->plane[0]);
	ipu_put_resources(ipu_crtc);

	return 0;
	}

	static struct platform_driver ipu_drm_driver = {
	.driver = {
	.name = "imx-ipuv3-crtc",
	},
	.probe = ipu_drm_probe,
	.remove = ipu_drm_remove,
	};
	module_platform_driver(ipu_drm_driver);

	MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
	MODULE_DESCRIPTION(DRIVER_DESC);
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:imx-ipuv3-crtc");