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

 /*
  * i.MX IPUv3 DP Overlay Planes
  *
  * Copyright (C) 2013 Philipp Zabel, 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.
  */

 #include <drm/drmP.h>
 #include <drm/drm_fb_cma_helper.h>
 #include <drm/drm_gem_cma_helper.h>

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

 #define to_ipu_plane(x)	container_of(x, struct ipu_plane, base)

 static const uint32_t ipu_plane_formats[] = {
 	DRM_FORMAT_XRGB1555,
 	DRM_FORMAT_XBGR1555,
 	DRM_FORMAT_ARGB8888,
 	DRM_FORMAT_XRGB8888,
 	DRM_FORMAT_ABGR8888,
 	DRM_FORMAT_XBGR8888,
 	DRM_FORMAT_YUYV,
 	DRM_FORMAT_YVYU,
 	DRM_FORMAT_YUV420,
 	DRM_FORMAT_YVU420,
 };

 int ipu_plane_irq(struct ipu_plane *ipu_plane)
 {
 	return ipu_idmac_channel_irq(ipu_plane->ipu, ipu_plane->ipu_ch,
 				     IPU_IRQ_EOF);
 }

 static int calc_vref(struct drm_display_mode *mode)
 {
 	unsigned long htotal, vtotal;

 	htotal = mode->htotal;
 	vtotal = mode->vtotal;

 	if (!htotal || !vtotal)
 		return 60;

 	return DIV_ROUND_UP(mode->clock * 1000, vtotal * htotal);
 }

 static inline int calc_bandwidth(int width, int height, unsigned int vref)
 {
 	return width * height * vref;
 }

 int ipu_plane_set_base(struct ipu_plane *ipu_plane, struct drm_framebuffer *fb,
 		       int x, int y)
 {
 	struct ipu_ch_param __iomem *cpmem;
 	struct drm_gem_cma_object *cma_obj;

 	cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
 	if (!cma_obj) {
 		DRM_LOG_KMS("entry is null.\n");
 		return -EFAULT;
 	}

 	dev_dbg(ipu_plane->base.dev->dev, "phys = 0x%x, x = %d, y = %d",
 		cma_obj->paddr, x, y);

 	cpmem = ipu_get_cpmem(ipu_plane->ipu_ch);
 	ipu_cpmem_set_stride(cpmem, fb->pitches[0]);
 	ipu_cpmem_set_buffer(cpmem, 0, cma_obj->paddr + fb->offsets[0] +
 			     fb->pitches[0] * y + x);

 	return 0;
 }

 int ipu_plane_mode_set(struct ipu_plane *ipu_plane, struct drm_crtc *crtc,
 		       struct drm_display_mode *mode,
 		       struct drm_framebuffer *fb, int crtc_x, int crtc_y,
 		       unsigned int crtc_w, unsigned int crtc_h,
 		       uint32_t src_x, uint32_t src_y,
 		       uint32_t src_w, uint32_t src_h)
 {
 	struct ipu_ch_param __iomem *cpmem;
 	struct device *dev = ipu_plane->base.dev->dev;
 	int ret;

 	/* no scaling */
 	if (src_w != crtc_w || src_h != crtc_h)
 		return -EINVAL;

 	/* clip to crtc bounds */
 	if (crtc_x < 0) {
 		if (-crtc_x > crtc_w)
 			return -EINVAL;
 		src_x += -crtc_x;
 		src_w -= -crtc_x;
 		crtc_w -= -crtc_x;
 		crtc_x = 0;
 	}
 	if (crtc_y < 0) {
 		if (-crtc_y > crtc_h)
 			return -EINVAL;
 		src_y += -crtc_y;
 		src_h -= -crtc_y;
 		crtc_h -= -crtc_y;
 		crtc_y = 0;
 	}
 	if (crtc_x + crtc_w > mode->hdisplay) {
 		if (crtc_x > mode->hdisplay)
 			return -EINVAL;
 		crtc_w = mode->hdisplay - crtc_x;
 		src_w = crtc_w;
 	}
 	if (crtc_y + crtc_h > mode->vdisplay) {
 		if (crtc_y > mode->vdisplay)
 			return -EINVAL;
 		crtc_h = mode->vdisplay - crtc_y;
 		src_h = crtc_h;
 	}
 	/* full plane minimum width is 13 pixels */
 	if (crtc_w < 13 && (ipu_plane->dp_flow != IPU_DP_FLOW_SYNC_FG))
 		return -EINVAL;
 	if (crtc_h < 2)
 		return -EINVAL;

 	switch (ipu_plane->dp_flow) {
 	case IPU_DP_FLOW_SYNC_BG:
 		ret = ipu_dp_setup_channel(ipu_plane->dp,
 				IPUV3_COLORSPACE_RGB,
 				IPUV3_COLORSPACE_RGB);
 		if (ret) {
 			dev_err(dev,
 				"initializing display processor failed with %d\n",
 				ret);
 			return ret;
 		}
 		ipu_dp_set_global_alpha(ipu_plane->dp, 1, 0, 1);
 		break;
 	case IPU_DP_FLOW_SYNC_FG:
 		ipu_dp_setup_channel(ipu_plane->dp,
 				ipu_drm_fourcc_to_colorspace(fb->pixel_format),
 				IPUV3_COLORSPACE_UNKNOWN);
 		ipu_dp_set_window_pos(ipu_plane->dp, crtc_x, crtc_y);
 		break;
 	}

 	ret = ipu_dmfc_init_channel(ipu_plane->dmfc, crtc_w);
 	if (ret) {
 		dev_err(dev, "initializing dmfc channel failed with %d\n", ret);
 		return ret;
 	}

 	ret = ipu_dmfc_alloc_bandwidth(ipu_plane->dmfc,
 			calc_bandwidth(crtc_w, crtc_h,
 				       calc_vref(mode)), 64);
 	if (ret) {
 		dev_err(dev, "allocating dmfc bandwidth failed with %d\n", ret);
 		return ret;
 	}

 	cpmem = ipu_get_cpmem(ipu_plane->ipu_ch);
 	ipu_ch_param_zero(cpmem);
 	ipu_cpmem_set_resolution(cpmem, src_w, src_h);
 	ret = ipu_cpmem_set_fmt(cpmem, fb->pixel_format);
 	if (ret < 0) {
 		dev_err(dev, "unsupported pixel format 0x%08x\n",
 			fb->pixel_format);
 		return ret;
 	}
 	ipu_cpmem_set_high_priority(ipu_plane->ipu_ch);

 	ret = ipu_plane_set_base(ipu_plane, fb, src_x, src_y);
 	if (ret < 0)
 		return ret;

 	return 0;
 }

 void ipu_plane_put_resources(struct ipu_plane *ipu_plane)
 {
 	if (!IS_ERR_OR_NULL(ipu_plane->dp))
 		ipu_dp_put(ipu_plane->dp);
 	if (!IS_ERR_OR_NULL(ipu_plane->dmfc))
 		ipu_dmfc_put(ipu_plane->dmfc);
 	if (!IS_ERR_OR_NULL(ipu_plane->ipu_ch))
 		ipu_idmac_put(ipu_plane->ipu_ch);
 }

 int ipu_plane_get_resources(struct ipu_plane *ipu_plane)
 {
 	int ret;

 	ipu_plane->ipu_ch = ipu_idmac_get(ipu_plane->ipu, ipu_plane->dma);
 	if (IS_ERR(ipu_plane->ipu_ch)) {
 		ret = PTR_ERR(ipu_plane->ipu_ch);
 		DRM_ERROR("failed to get idmac channel: %d\n", ret);
 		return ret;
 	}

 	ipu_plane->dmfc = ipu_dmfc_get(ipu_plane->ipu, ipu_plane->dma);
 	if (IS_ERR(ipu_plane->dmfc)) {
 		ret = PTR_ERR(ipu_plane->dmfc);
 		DRM_ERROR("failed to get dmfc: ret %d\n", ret);
 		goto err_out;
 	}

 	if (ipu_plane->dp_flow >= 0) {
 		ipu_plane->dp = ipu_dp_get(ipu_plane->ipu, ipu_plane->dp_flow);
 		if (IS_ERR(ipu_plane->dp)) {
 			ret = PTR_ERR(ipu_plane->dp);
 			DRM_ERROR("failed to get dp flow: %d\n", ret);
 			goto err_out;
 		}
 	}

 	return 0;
 err_out:
 	ipu_plane_put_resources(ipu_plane);

 	return ret;
 }

 void ipu_plane_enable(struct ipu_plane *ipu_plane)
 {
 	ipu_dmfc_enable_channel(ipu_plane->dmfc);
 	ipu_idmac_enable_channel(ipu_plane->ipu_ch);
 	if (ipu_plane->dp)
 		ipu_dp_enable_channel(ipu_plane->dp);

 	ipu_plane->enabled = true;
 }

 void ipu_plane_disable(struct ipu_plane *ipu_plane)
 {
 	ipu_plane->enabled = false;

 	ipu_idmac_wait_busy(ipu_plane->ipu_ch, 50);

 	if (ipu_plane->dp)
 		ipu_dp_disable_channel(ipu_plane->dp);
 	ipu_idmac_disable_channel(ipu_plane->ipu_ch);
 	ipu_dmfc_disable_channel(ipu_plane->dmfc);
 }

 static void ipu_plane_dpms(struct ipu_plane *ipu_plane, int mode)
 {
 	bool enable;

 	DRM_DEBUG_KMS("mode = %d", mode);

 	enable = (mode == DRM_MODE_DPMS_ON);

 	if (enable == ipu_plane->enabled)
 		return;

 	if (enable) {
 		ipu_plane_enable(ipu_plane);
 	} else {
 		ipu_plane_disable(ipu_plane);

 		ipu_idmac_put(ipu_plane->ipu_ch);
 		ipu_dmfc_put(ipu_plane->dmfc);
 		ipu_dp_put(ipu_plane->dp);
 	}
 }

 /*
  * drm_plane API
  */

 static int ipu_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
 			    struct drm_framebuffer *fb, int crtc_x, int crtc_y,
 			    unsigned int crtc_w, unsigned int crtc_h,
 			    uint32_t src_x, uint32_t src_y,
 			    uint32_t src_w, uint32_t src_h)
 {
 	struct ipu_plane *ipu_plane = to_ipu_plane(plane);
 	int ret = 0;

 	DRM_DEBUG_KMS("plane - %p\n", plane);

 	if (!ipu_plane->enabled)
 		ret = ipu_plane_get_resources(ipu_plane);
 	if (ret < 0)
 		return ret;

 	ret = ipu_plane_mode_set(ipu_plane, crtc, &crtc->hwmode, fb,
 			crtc_x, crtc_y, crtc_w, crtc_h,
 			src_x >> 16, src_y >> 16, src_w >> 16, src_h >> 16);
 	if (ret < 0) {
 		ipu_plane_put_resources(ipu_plane);
 		return ret;
 	}

 	if (crtc != plane->crtc)
 		dev_info(plane->dev->dev, "crtc change: %p -> %p\n",
 				plane->crtc, crtc);
 	plane->crtc = crtc;

 	ipu_plane_dpms(ipu_plane, DRM_MODE_DPMS_ON);

 	return 0;
 }

 static int ipu_disable_plane(struct drm_plane *plane)
 {
 	struct ipu_plane *ipu_plane = to_ipu_plane(plane);

 	DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);

 	ipu_plane_dpms(ipu_plane, DRM_MODE_DPMS_OFF);

 	ipu_plane_put_resources(ipu_plane);

 	return 0;
 }

 static void ipu_plane_destroy(struct drm_plane *plane)
 {
 	struct ipu_plane *ipu_plane = to_ipu_plane(plane);

 	DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);

 	ipu_disable_plane(plane);
 	drm_plane_cleanup(plane);
 	kfree(ipu_plane);
 }

 static struct drm_plane_funcs ipu_plane_funcs = {
 	.update_plane	= ipu_update_plane,
 	.disable_plane	= ipu_disable_plane,
 	.destroy	= ipu_plane_destroy,
 };

 struct ipu_plane *ipu_plane_init(struct drm_device *dev, struct ipu_soc *ipu,
 				 int dma, int dp, unsigned int possible_crtcs,
 				 bool priv)
 {
 	struct ipu_plane *ipu_plane;
 	int ret;

 	DRM_DEBUG_KMS("channel %d, dp flow %d, possible_crtcs=0x%x\n",
 		      dma, dp, possible_crtcs);

 	ipu_plane = kzalloc(sizeof(*ipu_plane), GFP_KERNEL);
 	if (!ipu_plane) {
 		DRM_ERROR("failed to allocate plane\n");
 		return ERR_PTR(-ENOMEM);
 	}

 	ipu_plane->ipu = ipu;
 	ipu_plane->dma = dma;
 	ipu_plane->dp_flow = dp;

 	ret = drm_plane_init(dev, &ipu_plane->base, possible_crtcs,
 			     &ipu_plane_funcs, ipu_plane_formats,
 			     ARRAY_SIZE(ipu_plane_formats),
 			     priv);
 	if (ret) {
 		DRM_ERROR("failed to initialize plane\n");
 		kfree(ipu_plane);
 		return ERR_PTR(ret);
 	}

 	return ipu_plane;
 }
	/*
	* i.MX IPUv3 DP Overlay Planes
	*
	* Copyright (C) 2013 Philipp Zabel, 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.
	*/

	#include <drm/drmP.h>
	#include <drm/drm_fb_cma_helper.h>
	#include <drm/drm_gem_cma_helper.h>

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

	#define to_ipu_plane(x) container_of(x, struct ipu_plane, base)

	static const uint32_t ipu_plane_formats[] = {
	DRM_FORMAT_XRGB1555,
	DRM_FORMAT_XBGR1555,
	DRM_FORMAT_ARGB8888,
	DRM_FORMAT_XRGB8888,
	DRM_FORMAT_ABGR8888,
	DRM_FORMAT_XBGR8888,
	DRM_FORMAT_YUYV,
	DRM_FORMAT_YVYU,
	DRM_FORMAT_YUV420,
	DRM_FORMAT_YVU420,
	};

	int ipu_plane_irq(struct ipu_plane *ipu_plane)
	{
	return ipu_idmac_channel_irq(ipu_plane->ipu, ipu_plane->ipu_ch,
	IPU_IRQ_EOF);
	}

	static int calc_vref(struct drm_display_mode *mode)
	{
	unsigned long htotal, vtotal;

	htotal = mode->htotal;
	vtotal = mode->vtotal;

	if (!htotal \|\| !vtotal)
	return 60;

	return DIV_ROUND_UP(mode->clock * 1000, vtotal * htotal);
	}

	static inline int calc_bandwidth(int width, int height, unsigned int vref)
	{
	return width * height * vref;
	}

	int ipu_plane_set_base(struct ipu_plane ipu_plane, struct drm_framebuffer fb,
	int x, int y)
	{
	struct ipu_ch_param __iomem *cpmem;
	struct drm_gem_cma_object *cma_obj;

	cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
	if (!cma_obj) {
	DRM_LOG_KMS("entry is null.\n");
	return -EFAULT;
	}

	dev_dbg(ipu_plane->base.dev->dev, "phys = 0x%x, x = %d, y = %d",
	cma_obj->paddr, x, y);

	cpmem = ipu_get_cpmem(ipu_plane->ipu_ch);
	ipu_cpmem_set_stride(cpmem, fb->pitches[0]);
	ipu_cpmem_set_buffer(cpmem, 0, cma_obj->paddr + fb->offsets[0] +
	fb->pitches[0] * y + x);

	return 0;
	}

	int ipu_plane_mode_set(struct ipu_plane ipu_plane, struct drm_crtc crtc,
	struct drm_display_mode *mode,
	struct drm_framebuffer *fb, int crtc_x, int crtc_y,
	unsigned int crtc_w, unsigned int crtc_h,
	uint32_t src_x, uint32_t src_y,
	uint32_t src_w, uint32_t src_h)
	{
	struct ipu_ch_param __iomem *cpmem;
	struct device *dev = ipu_plane->base.dev->dev;
	int ret;

	/* no scaling */
	if (src_w != crtc_w \|\| src_h != crtc_h)
	return -EINVAL;

	/* clip to crtc bounds */
	if (crtc_x < 0) {
	if (-crtc_x > crtc_w)
	return -EINVAL;
	src_x += -crtc_x;
	src_w -= -crtc_x;
	crtc_w -= -crtc_x;
	crtc_x = 0;
	}
	if (crtc_y < 0) {
	if (-crtc_y > crtc_h)
	return -EINVAL;
	src_y += -crtc_y;
	src_h -= -crtc_y;
	crtc_h -= -crtc_y;
	crtc_y = 0;
	}
	if (crtc_x + crtc_w > mode->hdisplay) {
	if (crtc_x > mode->hdisplay)
	return -EINVAL;
	crtc_w = mode->hdisplay - crtc_x;
	src_w = crtc_w;
	}
	if (crtc_y + crtc_h > mode->vdisplay) {
	if (crtc_y > mode->vdisplay)
	return -EINVAL;
	crtc_h = mode->vdisplay - crtc_y;
	src_h = crtc_h;
	}
	/* full plane minimum width is 13 pixels */
	if (crtc_w < 13 && (ipu_plane->dp_flow != IPU_DP_FLOW_SYNC_FG))
	return -EINVAL;
	if (crtc_h < 2)
	return -EINVAL;

	switch (ipu_plane->dp_flow) {
	case IPU_DP_FLOW_SYNC_BG:
	ret = ipu_dp_setup_channel(ipu_plane->dp,
	IPUV3_COLORSPACE_RGB,
	IPUV3_COLORSPACE_RGB);
	if (ret) {
	dev_err(dev,
	"initializing display processor failed with %d\n",
	ret);
	return ret;
	}
	ipu_dp_set_global_alpha(ipu_plane->dp, 1, 0, 1);
	break;
	case IPU_DP_FLOW_SYNC_FG:
	ipu_dp_setup_channel(ipu_plane->dp,
	ipu_drm_fourcc_to_colorspace(fb->pixel_format),
	IPUV3_COLORSPACE_UNKNOWN);
	ipu_dp_set_window_pos(ipu_plane->dp, crtc_x, crtc_y);
	break;
	}

	ret = ipu_dmfc_init_channel(ipu_plane->dmfc, crtc_w);
	if (ret) {
	dev_err(dev, "initializing dmfc channel failed with %d\n", ret);
	return ret;
	}

	ret = ipu_dmfc_alloc_bandwidth(ipu_plane->dmfc,
	calc_bandwidth(crtc_w, crtc_h,
	calc_vref(mode)), 64);
	if (ret) {
	dev_err(dev, "allocating dmfc bandwidth failed with %d\n", ret);
	return ret;
	}

	cpmem = ipu_get_cpmem(ipu_plane->ipu_ch);
	ipu_ch_param_zero(cpmem);
	ipu_cpmem_set_resolution(cpmem, src_w, src_h);
	ret = ipu_cpmem_set_fmt(cpmem, fb->pixel_format);
	if (ret < 0) {
	dev_err(dev, "unsupported pixel format 0x%08x\n",
	fb->pixel_format);
	return ret;
	}
	ipu_cpmem_set_high_priority(ipu_plane->ipu_ch);

	ret = ipu_plane_set_base(ipu_plane, fb, src_x, src_y);
	if (ret < 0)
	return ret;

	return 0;
	}

	void ipu_plane_put_resources(struct ipu_plane *ipu_plane)
	{
	if (!IS_ERR_OR_NULL(ipu_plane->dp))
	ipu_dp_put(ipu_plane->dp);
	if (!IS_ERR_OR_NULL(ipu_plane->dmfc))
	ipu_dmfc_put(ipu_plane->dmfc);
	if (!IS_ERR_OR_NULL(ipu_plane->ipu_ch))
	ipu_idmac_put(ipu_plane->ipu_ch);
	}

	int ipu_plane_get_resources(struct ipu_plane *ipu_plane)
	{
	int ret;

	ipu_plane->ipu_ch = ipu_idmac_get(ipu_plane->ipu, ipu_plane->dma);
	if (IS_ERR(ipu_plane->ipu_ch)) {
	ret = PTR_ERR(ipu_plane->ipu_ch);
	DRM_ERROR("failed to get idmac channel: %d\n", ret);
	return ret;
	}

	ipu_plane->dmfc = ipu_dmfc_get(ipu_plane->ipu, ipu_plane->dma);
	if (IS_ERR(ipu_plane->dmfc)) {
	ret = PTR_ERR(ipu_plane->dmfc);
	DRM_ERROR("failed to get dmfc: ret %d\n", ret);
	goto err_out;
	}

	if (ipu_plane->dp_flow >= 0) {
	ipu_plane->dp = ipu_dp_get(ipu_plane->ipu, ipu_plane->dp_flow);
	if (IS_ERR(ipu_plane->dp)) {
	ret = PTR_ERR(ipu_plane->dp);
	DRM_ERROR("failed to get dp flow: %d\n", ret);
	goto err_out;
	}
	}

	return 0;
	err_out:
	ipu_plane_put_resources(ipu_plane);

	return ret;
	}

	void ipu_plane_enable(struct ipu_plane *ipu_plane)
	{
	ipu_dmfc_enable_channel(ipu_plane->dmfc);
	ipu_idmac_enable_channel(ipu_plane->ipu_ch);
	if (ipu_plane->dp)
	ipu_dp_enable_channel(ipu_plane->dp);

	ipu_plane->enabled = true;
	}

	void ipu_plane_disable(struct ipu_plane *ipu_plane)
	{
	ipu_plane->enabled = false;

	ipu_idmac_wait_busy(ipu_plane->ipu_ch, 50);

	if (ipu_plane->dp)
	ipu_dp_disable_channel(ipu_plane->dp);
	ipu_idmac_disable_channel(ipu_plane->ipu_ch);
	ipu_dmfc_disable_channel(ipu_plane->dmfc);
	}

	static void ipu_plane_dpms(struct ipu_plane *ipu_plane, int mode)
	{
	bool enable;

	DRM_DEBUG_KMS("mode = %d", mode);

	enable = (mode == DRM_MODE_DPMS_ON);

	if (enable == ipu_plane->enabled)
	return;

	if (enable) {
	ipu_plane_enable(ipu_plane);
	} else {
	ipu_plane_disable(ipu_plane);

	ipu_idmac_put(ipu_plane->ipu_ch);
	ipu_dmfc_put(ipu_plane->dmfc);
	ipu_dp_put(ipu_plane->dp);
	}
	}

	/*
	* drm_plane API
	*/

	static int ipu_update_plane(struct drm_plane plane, struct drm_crtc crtc,
	struct drm_framebuffer *fb, int crtc_x, int crtc_y,
	unsigned int crtc_w, unsigned int crtc_h,
	uint32_t src_x, uint32_t src_y,
	uint32_t src_w, uint32_t src_h)
	{
	struct ipu_plane *ipu_plane = to_ipu_plane(plane);
	int ret = 0;

	DRM_DEBUG_KMS("plane - %p\n", plane);

	if (!ipu_plane->enabled)
	ret = ipu_plane_get_resources(ipu_plane);
	if (ret < 0)
	return ret;

	ret = ipu_plane_mode_set(ipu_plane, crtc, &crtc->hwmode, fb,
	crtc_x, crtc_y, crtc_w, crtc_h,
	src_x >> 16, src_y >> 16, src_w >> 16, src_h >> 16);
	if (ret < 0) {
	ipu_plane_put_resources(ipu_plane);
	return ret;
	}

	if (crtc != plane->crtc)
	dev_info(plane->dev->dev, "crtc change: %p -> %p\n",
	plane->crtc, crtc);
	plane->crtc = crtc;

	ipu_plane_dpms(ipu_plane, DRM_MODE_DPMS_ON);

	return 0;
	}

	static int ipu_disable_plane(struct drm_plane *plane)
	{
	struct ipu_plane *ipu_plane = to_ipu_plane(plane);

	DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);

	ipu_plane_dpms(ipu_plane, DRM_MODE_DPMS_OFF);

	ipu_plane_put_resources(ipu_plane);

	return 0;
	}

	static void ipu_plane_destroy(struct drm_plane *plane)
	{
	struct ipu_plane *ipu_plane = to_ipu_plane(plane);

	DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);

	ipu_disable_plane(plane);
	drm_plane_cleanup(plane);
	kfree(ipu_plane);
	}

	static struct drm_plane_funcs ipu_plane_funcs = {
	.update_plane = ipu_update_plane,
	.disable_plane = ipu_disable_plane,
	.destroy = ipu_plane_destroy,
	};

	struct ipu_plane ipu_plane_init(struct drm_device dev, struct ipu_soc *ipu,
	int dma, int dp, unsigned int possible_crtcs,
	bool priv)
	{
	struct ipu_plane *ipu_plane;
	int ret;

	DRM_DEBUG_KMS("channel %d, dp flow %d, possible_crtcs=0x%x\n",
	dma, dp, possible_crtcs);

	ipu_plane = kzalloc(sizeof(*ipu_plane), GFP_KERNEL);
	if (!ipu_plane) {
	DRM_ERROR("failed to allocate plane\n");
	return ERR_PTR(-ENOMEM);
	}

	ipu_plane->ipu = ipu;
	ipu_plane->dma = dma;
	ipu_plane->dp_flow = dp;

	ret = drm_plane_init(dev, &ipu_plane->base, possible_crtcs,
	&ipu_plane_funcs, ipu_plane_formats,
	ARRAY_SIZE(ipu_plane_formats),
	priv);
	if (ret) {
	DRM_ERROR("failed to initialize plane\n");
	kfree(ipu_plane);
	return ERR_PTR(ret);
	}

	return ipu_plane;
	}