drivers/gpu/drm/tegra/plane.c - third_party/linux - Git at Google

 /*
  * Copyright (C) 2017 NVIDIA CORPORATION.  All rights reserved.
  *
  * 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.
  */

 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_plane_helper.h>

 #include "dc.h"
 #include "plane.h"

 static void tegra_plane_destroy(struct drm_plane *plane)
 {
 	struct tegra_plane *p = to_tegra_plane(plane);

 	drm_plane_cleanup(plane);
 	kfree(p);
 }

 static void tegra_plane_reset(struct drm_plane *plane)
 {
 	struct tegra_plane *p = to_tegra_plane(plane);
 	struct tegra_plane_state *state;

 	if (plane->state)
 		__drm_atomic_helper_plane_destroy_state(plane->state);

 	kfree(plane->state);
 	plane->state = NULL;

 	state = kzalloc(sizeof(*state), GFP_KERNEL);
 	if (state) {
 		plane->state = &state->base;
 		plane->state->plane = plane;
 		plane->state->zpos = p->index;
 		plane->state->normalized_zpos = p->index;
 	}
 }

 static struct drm_plane_state *
 tegra_plane_atomic_duplicate_state(struct drm_plane *plane)
 {
 	struct tegra_plane_state *state = to_tegra_plane_state(plane->state);
 	struct tegra_plane_state *copy;
 	unsigned int i;

 	copy = kmalloc(sizeof(*copy), GFP_KERNEL);
 	if (!copy)
 		return NULL;

 	__drm_atomic_helper_plane_duplicate_state(plane, &copy->base);
 	copy->tiling = state->tiling;
 	copy->format = state->format;
 	copy->swap = state->swap;
 	copy->bottom_up = state->bottom_up;
 	copy->opaque = state->opaque;

 	for (i = 0; i < 2; i++)
 		copy->blending[i] = state->blending[i];

 	return &copy->base;
 }

 static void tegra_plane_atomic_destroy_state(struct drm_plane *plane,
 					     struct drm_plane_state *state)
 {
 	__drm_atomic_helper_plane_destroy_state(state);
 	kfree(state);
 }

 static bool tegra_plane_format_mod_supported(struct drm_plane *plane,
 					     uint32_t format,
 					     uint64_t modifier)
 {
 	const struct drm_format_info *info = drm_format_info(format);

 	if (modifier == DRM_FORMAT_MOD_LINEAR)
 		return true;

 	if (info->num_planes == 1)
 		return true;

 	return false;
 }

 const struct drm_plane_funcs tegra_plane_funcs = {
 	.update_plane = drm_atomic_helper_update_plane,
 	.disable_plane = drm_atomic_helper_disable_plane,
 	.destroy = tegra_plane_destroy,
 	.reset = tegra_plane_reset,
 	.atomic_duplicate_state = tegra_plane_atomic_duplicate_state,
 	.atomic_destroy_state = tegra_plane_atomic_destroy_state,
 	.format_mod_supported = tegra_plane_format_mod_supported,
 };

 int tegra_plane_state_add(struct tegra_plane *plane,
 			  struct drm_plane_state *state)
 {
 	struct drm_crtc_state *crtc_state;
 	struct tegra_dc_state *tegra;
 	int err;

 	/* Propagate errors from allocation or locking failures. */
 	crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
 	if (IS_ERR(crtc_state))
 		return PTR_ERR(crtc_state);

 	/* Check plane state for visibility and calculate clipping bounds */
 	err = drm_atomic_helper_check_plane_state(state, crtc_state,
 						  0, INT_MAX, true, true);
 	if (err < 0)
 		return err;

 	tegra = to_dc_state(crtc_state);

 	tegra->planes |= WIN_A_ACT_REQ << plane->index;

 	return 0;
 }

 int tegra_plane_format(u32 fourcc, u32 *format, u32 *swap)
 {
 	/* assume no swapping of fetched data */
 	if (swap)
 		*swap = BYTE_SWAP_NOSWAP;

 	switch (fourcc) {
 	case DRM_FORMAT_ARGB4444:
 		*format = WIN_COLOR_DEPTH_B4G4R4A4;
 		break;

 	case DRM_FORMAT_ARGB1555:
 		*format = WIN_COLOR_DEPTH_B5G5R5A1;
 		break;

 	case DRM_FORMAT_RGB565:
 		*format = WIN_COLOR_DEPTH_B5G6R5;
 		break;

 	case DRM_FORMAT_RGBA5551:
 		*format = WIN_COLOR_DEPTH_A1B5G5R5;
 		break;

 	case DRM_FORMAT_ARGB8888:
 		*format = WIN_COLOR_DEPTH_B8G8R8A8;
 		break;

 	case DRM_FORMAT_ABGR8888:
 		*format = WIN_COLOR_DEPTH_R8G8B8A8;
 		break;

 	case DRM_FORMAT_ABGR4444:
 		*format = WIN_COLOR_DEPTH_R4G4B4A4;
 		break;

 	case DRM_FORMAT_ABGR1555:
 		*format = WIN_COLOR_DEPTH_R5G5B5A;
 		break;

 	case DRM_FORMAT_BGRA5551:
 		*format = WIN_COLOR_DEPTH_AR5G5B5;
 		break;

 	case DRM_FORMAT_XRGB1555:
 		*format = WIN_COLOR_DEPTH_B5G5R5X1;
 		break;

 	case DRM_FORMAT_RGBX5551:
 		*format = WIN_COLOR_DEPTH_X1B5G5R5;
 		break;

 	case DRM_FORMAT_XBGR1555:
 		*format = WIN_COLOR_DEPTH_R5G5B5X1;
 		break;

 	case DRM_FORMAT_BGRX5551:
 		*format = WIN_COLOR_DEPTH_X1R5G5B5;
 		break;

 	case DRM_FORMAT_BGR565:
 		*format = WIN_COLOR_DEPTH_R5G6B5;
 		break;

 	case DRM_FORMAT_BGRA8888:
 		*format = WIN_COLOR_DEPTH_A8R8G8B8;
 		break;

 	case DRM_FORMAT_RGBA8888:
 		*format = WIN_COLOR_DEPTH_A8B8G8R8;
 		break;

 	case DRM_FORMAT_XRGB8888:
 		*format = WIN_COLOR_DEPTH_B8G8R8X8;
 		break;

 	case DRM_FORMAT_XBGR8888:
 		*format = WIN_COLOR_DEPTH_R8G8B8X8;
 		break;

 	case DRM_FORMAT_UYVY:
 		*format = WIN_COLOR_DEPTH_YCbCr422;
 		break;

 	case DRM_FORMAT_YUYV:
 		if (!swap)
 			return -EINVAL;

 		*format = WIN_COLOR_DEPTH_YCbCr422;
 		*swap = BYTE_SWAP_SWAP2;
 		break;

 	case DRM_FORMAT_YUV420:
 		*format = WIN_COLOR_DEPTH_YCbCr420P;
 		break;

 	case DRM_FORMAT_YUV422:
 		*format = WIN_COLOR_DEPTH_YCbCr422P;
 		break;

 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 bool tegra_plane_format_is_yuv(unsigned int format, bool *planar)
 {
 	switch (format) {
 	case WIN_COLOR_DEPTH_YCbCr422:
 	case WIN_COLOR_DEPTH_YUV422:
 		if (planar)
 			*planar = false;

 		return true;

 	case WIN_COLOR_DEPTH_YCbCr420P:
 	case WIN_COLOR_DEPTH_YUV420P:
 	case WIN_COLOR_DEPTH_YCbCr422P:
 	case WIN_COLOR_DEPTH_YUV422P:
 	case WIN_COLOR_DEPTH_YCbCr422R:
 	case WIN_COLOR_DEPTH_YUV422R:
 	case WIN_COLOR_DEPTH_YCbCr422RA:
 	case WIN_COLOR_DEPTH_YUV422RA:
 		if (planar)
 			*planar = true;

 		return true;
 	}

 	if (planar)
 		*planar = false;

 	return false;
 }

 static bool __drm_format_has_alpha(u32 format)
 {
 	switch (format) {
 	case DRM_FORMAT_ARGB1555:
 	case DRM_FORMAT_RGBA5551:
 	case DRM_FORMAT_ABGR8888:
 	case DRM_FORMAT_ARGB8888:
 		return true;
 	}

 	return false;
 }

 static int tegra_plane_format_get_alpha(unsigned int opaque,
 					unsigned int *alpha)
 {
 	if (tegra_plane_format_is_yuv(opaque, NULL)) {
 		*alpha = opaque;
 		return 0;
 	}

 	switch (opaque) {
 	case WIN_COLOR_DEPTH_B5G5R5X1:
 		*alpha = WIN_COLOR_DEPTH_B5G5R5A1;
 		return 0;

 	case WIN_COLOR_DEPTH_X1B5G5R5:
 		*alpha = WIN_COLOR_DEPTH_A1B5G5R5;
 		return 0;

 	case WIN_COLOR_DEPTH_R8G8B8X8:
 		*alpha = WIN_COLOR_DEPTH_R8G8B8A8;
 		return 0;

 	case WIN_COLOR_DEPTH_B8G8R8X8:
 		*alpha = WIN_COLOR_DEPTH_B8G8R8A8;
 		return 0;

 	case WIN_COLOR_DEPTH_B5G6R5:
 		*alpha = opaque;
 		return 0;
 	}

 	return -EINVAL;
 }

 /*
  * This is applicable to Tegra20 and Tegra30 only where the opaque formats can
  * be emulated using the alpha formats and alpha blending disabled.
  */
 static int tegra_plane_setup_opacity(struct tegra_plane *tegra,
 				     struct tegra_plane_state *state)
 {
 	unsigned int format;
 	int err;

 	switch (state->format) {
 	case WIN_COLOR_DEPTH_B5G5R5A1:
 	case WIN_COLOR_DEPTH_A1B5G5R5:
 	case WIN_COLOR_DEPTH_R8G8B8A8:
 	case WIN_COLOR_DEPTH_B8G8R8A8:
 		state->opaque = false;
 		break;

 	default:
 		err = tegra_plane_format_get_alpha(state->format, &format);
 		if (err < 0)
 			return err;

 		state->format = format;
 		state->opaque = true;
 		break;
 	}

 	return 0;
 }

 static int tegra_plane_check_transparency(struct tegra_plane *tegra,
 					  struct tegra_plane_state *state)
 {
 	struct drm_plane_state *old, *plane_state;
 	struct drm_plane *plane;

 	old = drm_atomic_get_old_plane_state(state->base.state, &tegra->base);

 	/* check if zpos / transparency changed */
 	if (old->normalized_zpos == state->base.normalized_zpos &&
 	    to_tegra_plane_state(old)->opaque == state->opaque)
 		return 0;

 	/* include all sibling planes into this commit */
 	drm_for_each_plane(plane, tegra->base.dev) {
 		struct tegra_plane *p = to_tegra_plane(plane);

 		/* skip this plane and planes on different CRTCs */
 		if (p == tegra || p->dc != tegra->dc)
 			continue;

 		plane_state = drm_atomic_get_plane_state(state->base.state,
 							 plane);
 		if (IS_ERR(plane_state))
 			return PTR_ERR(plane_state);
 	}

 	return 1;
 }

 static unsigned int tegra_plane_get_overlap_index(struct tegra_plane *plane,
 						  struct tegra_plane *other)
 {
 	unsigned int index = 0, i;

 	WARN_ON(plane == other);

 	for (i = 0; i < 3; i++) {
 		if (i == plane->index)
 			continue;

 		if (i == other->index)
 			break;

 		index++;
 	}

 	return index;
 }

 static void tegra_plane_update_transparency(struct tegra_plane *tegra,
 					    struct tegra_plane_state *state)
 {
 	struct drm_plane_state *new;
 	struct drm_plane *plane;
 	unsigned int i;

 	for_each_new_plane_in_state(state->base.state, plane, new, i) {
 		struct tegra_plane *p = to_tegra_plane(plane);
 		unsigned index;

 		/* skip this plane and planes on different CRTCs */
 		if (p == tegra || p->dc != tegra->dc)
 			continue;

 		index = tegra_plane_get_overlap_index(tegra, p);

 		if (new->fb && __drm_format_has_alpha(new->fb->format->format))
 			state->blending[index].alpha = true;
 		else
 			state->blending[index].alpha = false;

 		if (new->normalized_zpos > state->base.normalized_zpos)
 			state->blending[index].top = true;
 		else
 			state->blending[index].top = false;

 		/*
 		 * Missing framebuffer means that plane is disabled, in this
 		 * case mark B / C window as top to be able to differentiate
 		 * windows indices order in regards to zPos for the middle
 		 * window X / Y registers programming.
 		 */
 		if (!new->fb)
 			state->blending[index].top = (index == 1);
 	}
 }

 static int tegra_plane_setup_transparency(struct tegra_plane *tegra,
 					  struct tegra_plane_state *state)
 {
 	struct tegra_plane_state *tegra_state;
 	struct drm_plane_state *new;
 	struct drm_plane *plane;
 	int err;

 	/*
 	 * If planes zpos / transparency changed, sibling planes blending
 	 * state may require adjustment and in this case they will be included
 	 * into this atom commit, otherwise blending state is unchanged.
 	 */
 	err = tegra_plane_check_transparency(tegra, state);
 	if (err <= 0)
 		return err;

 	/*
 	 * All planes are now in the atomic state, walk them up and update
 	 * transparency state for each plane.
 	 */
 	drm_for_each_plane(plane, tegra->base.dev) {
 		struct tegra_plane *p = to_tegra_plane(plane);

 		/* skip planes on different CRTCs */
 		if (p->dc != tegra->dc)
 			continue;

 		new = drm_atomic_get_new_plane_state(state->base.state, plane);
 		tegra_state = to_tegra_plane_state(new);

 		/*
 		 * There is no need to update blending state for the disabled
 		 * plane.
 		 */
 		if (new->fb)
 			tegra_plane_update_transparency(p, tegra_state);
 	}

 	return 0;
 }

 int tegra_plane_setup_legacy_state(struct tegra_plane *tegra,
 				   struct tegra_plane_state *state)
 {
 	int err;

 	err = tegra_plane_setup_opacity(tegra, state);
 	if (err < 0)
 		return err;

 	err = tegra_plane_setup_transparency(tegra, state);
 	if (err < 0)
 		return err;

 	return 0;
 }
	/*
	* Copyright (C) 2017 NVIDIA CORPORATION. All rights reserved.
	*
	* 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.
	*/

	#include <drm/drm_atomic.h>
	#include <drm/drm_atomic_helper.h>
	#include <drm/drm_plane_helper.h>

	#include "dc.h"
	#include "plane.h"

	static void tegra_plane_destroy(struct drm_plane *plane)
	{
	struct tegra_plane *p = to_tegra_plane(plane);

	drm_plane_cleanup(plane);
	kfree(p);
	}

	static void tegra_plane_reset(struct drm_plane *plane)
	{
	struct tegra_plane *p = to_tegra_plane(plane);
	struct tegra_plane_state *state;

	if (plane->state)
	__drm_atomic_helper_plane_destroy_state(plane->state);

	kfree(plane->state);
	plane->state = NULL;

	state = kzalloc(sizeof(*state), GFP_KERNEL);
	if (state) {
	plane->state = &state->base;
	plane->state->plane = plane;
	plane->state->zpos = p->index;
	plane->state->normalized_zpos = p->index;
	}
	}

	static struct drm_plane_state *
	tegra_plane_atomic_duplicate_state(struct drm_plane *plane)
	{
	struct tegra_plane_state *state = to_tegra_plane_state(plane->state);
	struct tegra_plane_state *copy;
	unsigned int i;

	copy = kmalloc(sizeof(*copy), GFP_KERNEL);
	if (!copy)
	return NULL;

	__drm_atomic_helper_plane_duplicate_state(plane, &copy->base);
	copy->tiling = state->tiling;
	copy->format = state->format;
	copy->swap = state->swap;
	copy->bottom_up = state->bottom_up;
	copy->opaque = state->opaque;

	for (i = 0; i < 2; i++)
	copy->blending[i] = state->blending[i];

	return &copy->base;
	}

	static void tegra_plane_atomic_destroy_state(struct drm_plane *plane,
	struct drm_plane_state *state)
	{
	__drm_atomic_helper_plane_destroy_state(state);
	kfree(state);
	}

	static bool tegra_plane_format_mod_supported(struct drm_plane *plane,
	uint32_t format,
	uint64_t modifier)
	{
	const struct drm_format_info *info = drm_format_info(format);

	if (modifier == DRM_FORMAT_MOD_LINEAR)
	return true;

	if (info->num_planes == 1)
	return true;

	return false;
	}

	const struct drm_plane_funcs tegra_plane_funcs = {
	.update_plane = drm_atomic_helper_update_plane,
	.disable_plane = drm_atomic_helper_disable_plane,
	.destroy = tegra_plane_destroy,
	.reset = tegra_plane_reset,
	.atomic_duplicate_state = tegra_plane_atomic_duplicate_state,
	.atomic_destroy_state = tegra_plane_atomic_destroy_state,
	.format_mod_supported = tegra_plane_format_mod_supported,
	};

	int tegra_plane_state_add(struct tegra_plane *plane,
	struct drm_plane_state *state)
	{
	struct drm_crtc_state *crtc_state;
	struct tegra_dc_state *tegra;
	int err;

	/* Propagate errors from allocation or locking failures. */
	crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
	if (IS_ERR(crtc_state))
	return PTR_ERR(crtc_state);

	/* Check plane state for visibility and calculate clipping bounds */
	err = drm_atomic_helper_check_plane_state(state, crtc_state,
	0, INT_MAX, true, true);
	if (err < 0)
	return err;

	tegra = to_dc_state(crtc_state);

	tegra->planes \|= WIN_A_ACT_REQ << plane->index;

	return 0;
	}

	int tegra_plane_format(u32 fourcc, u32 format, u32 swap)
	{
	/* assume no swapping of fetched data */
	if (swap)
	*swap = BYTE_SWAP_NOSWAP;

	switch (fourcc) {
	case DRM_FORMAT_ARGB4444:
	*format = WIN_COLOR_DEPTH_B4G4R4A4;
	break;

	case DRM_FORMAT_ARGB1555:
	*format = WIN_COLOR_DEPTH_B5G5R5A1;
	break;

	case DRM_FORMAT_RGB565:
	*format = WIN_COLOR_DEPTH_B5G6R5;
	break;

	case DRM_FORMAT_RGBA5551:
	*format = WIN_COLOR_DEPTH_A1B5G5R5;
	break;

	case DRM_FORMAT_ARGB8888:
	*format = WIN_COLOR_DEPTH_B8G8R8A8;
	break;

	case DRM_FORMAT_ABGR8888:
	*format = WIN_COLOR_DEPTH_R8G8B8A8;
	break;

	case DRM_FORMAT_ABGR4444:
	*format = WIN_COLOR_DEPTH_R4G4B4A4;
	break;

	case DRM_FORMAT_ABGR1555:
	*format = WIN_COLOR_DEPTH_R5G5B5A;
	break;

	case DRM_FORMAT_BGRA5551:
	*format = WIN_COLOR_DEPTH_AR5G5B5;
	break;

	case DRM_FORMAT_XRGB1555:
	*format = WIN_COLOR_DEPTH_B5G5R5X1;
	break;

	case DRM_FORMAT_RGBX5551:
	*format = WIN_COLOR_DEPTH_X1B5G5R5;
	break;

	case DRM_FORMAT_XBGR1555:
	*format = WIN_COLOR_DEPTH_R5G5B5X1;
	break;

	case DRM_FORMAT_BGRX5551:
	*format = WIN_COLOR_DEPTH_X1R5G5B5;
	break;

	case DRM_FORMAT_BGR565:
	*format = WIN_COLOR_DEPTH_R5G6B5;
	break;

	case DRM_FORMAT_BGRA8888:
	*format = WIN_COLOR_DEPTH_A8R8G8B8;
	break;

	case DRM_FORMAT_RGBA8888:
	*format = WIN_COLOR_DEPTH_A8B8G8R8;
	break;

	case DRM_FORMAT_XRGB8888:
	*format = WIN_COLOR_DEPTH_B8G8R8X8;
	break;

	case DRM_FORMAT_XBGR8888:
	*format = WIN_COLOR_DEPTH_R8G8B8X8;
	break;

	case DRM_FORMAT_UYVY:
	*format = WIN_COLOR_DEPTH_YCbCr422;
	break;

	case DRM_FORMAT_YUYV:
	if (!swap)
	return -EINVAL;

	*format = WIN_COLOR_DEPTH_YCbCr422;
	*swap = BYTE_SWAP_SWAP2;
	break;

	case DRM_FORMAT_YUV420:
	*format = WIN_COLOR_DEPTH_YCbCr420P;
	break;

	case DRM_FORMAT_YUV422:
	*format = WIN_COLOR_DEPTH_YCbCr422P;
	break;

	default:
	return -EINVAL;
	}

	return 0;
	}

	bool tegra_plane_format_is_yuv(unsigned int format, bool *planar)
	{
	switch (format) {
	case WIN_COLOR_DEPTH_YCbCr422:
	case WIN_COLOR_DEPTH_YUV422:
	if (planar)
	*planar = false;

	return true;

	case WIN_COLOR_DEPTH_YCbCr420P:
	case WIN_COLOR_DEPTH_YUV420P:
	case WIN_COLOR_DEPTH_YCbCr422P:
	case WIN_COLOR_DEPTH_YUV422P:
	case WIN_COLOR_DEPTH_YCbCr422R:
	case WIN_COLOR_DEPTH_YUV422R:
	case WIN_COLOR_DEPTH_YCbCr422RA:
	case WIN_COLOR_DEPTH_YUV422RA:
	if (planar)
	*planar = true;

	return true;
	}

	if (planar)
	*planar = false;

	return false;
	}

	static bool __drm_format_has_alpha(u32 format)
	{
	switch (format) {
	case DRM_FORMAT_ARGB1555:
	case DRM_FORMAT_RGBA5551:
	case DRM_FORMAT_ABGR8888:
	case DRM_FORMAT_ARGB8888:
	return true;
	}

	return false;
	}

	static int tegra_plane_format_get_alpha(unsigned int opaque,
	unsigned int *alpha)
	{
	if (tegra_plane_format_is_yuv(opaque, NULL)) {
	*alpha = opaque;
	return 0;
	}

	switch (opaque) {
	case WIN_COLOR_DEPTH_B5G5R5X1:
	*alpha = WIN_COLOR_DEPTH_B5G5R5A1;
	return 0;

	case WIN_COLOR_DEPTH_X1B5G5R5:
	*alpha = WIN_COLOR_DEPTH_A1B5G5R5;
	return 0;

	case WIN_COLOR_DEPTH_R8G8B8X8:
	*alpha = WIN_COLOR_DEPTH_R8G8B8A8;
	return 0;

	case WIN_COLOR_DEPTH_B8G8R8X8:
	*alpha = WIN_COLOR_DEPTH_B8G8R8A8;
	return 0;

	case WIN_COLOR_DEPTH_B5G6R5:
	*alpha = opaque;
	return 0;
	}

	return -EINVAL;
	}

	/*
	* This is applicable to Tegra20 and Tegra30 only where the opaque formats can
	* be emulated using the alpha formats and alpha blending disabled.
	*/
	static int tegra_plane_setup_opacity(struct tegra_plane *tegra,
	struct tegra_plane_state *state)
	{
	unsigned int format;
	int err;

	switch (state->format) {
	case WIN_COLOR_DEPTH_B5G5R5A1:
	case WIN_COLOR_DEPTH_A1B5G5R5:
	case WIN_COLOR_DEPTH_R8G8B8A8:
	case WIN_COLOR_DEPTH_B8G8R8A8:
	state->opaque = false;
	break;

	default:
	err = tegra_plane_format_get_alpha(state->format, &format);
	if (err < 0)
	return err;

	state->format = format;
	state->opaque = true;
	break;
	}

	return 0;
	}

	static int tegra_plane_check_transparency(struct tegra_plane *tegra,
	struct tegra_plane_state *state)
	{
	struct drm_plane_state old, plane_state;
	struct drm_plane *plane;

	old = drm_atomic_get_old_plane_state(state->base.state, &tegra->base);

	/* check if zpos / transparency changed */
	if (old->normalized_zpos == state->base.normalized_zpos &&
	to_tegra_plane_state(old)->opaque == state->opaque)
	return 0;

	/* include all sibling planes into this commit */
	drm_for_each_plane(plane, tegra->base.dev) {
	struct tegra_plane *p = to_tegra_plane(plane);

	/* skip this plane and planes on different CRTCs */
	if (p == tegra \|\| p->dc != tegra->dc)
	continue;

	plane_state = drm_atomic_get_plane_state(state->base.state,
	plane);
	if (IS_ERR(plane_state))
	return PTR_ERR(plane_state);
	}

	return 1;
	}

	static unsigned int tegra_plane_get_overlap_index(struct tegra_plane *plane,
	struct tegra_plane *other)
	{
	unsigned int index = 0, i;

	WARN_ON(plane == other);

	for (i = 0; i < 3; i++) {
	if (i == plane->index)
	continue;

	if (i == other->index)
	break;

	index++;
	}

	return index;
	}

	static void tegra_plane_update_transparency(struct tegra_plane *tegra,
	struct tegra_plane_state *state)
	{
	struct drm_plane_state *new;
	struct drm_plane *plane;
	unsigned int i;

	for_each_new_plane_in_state(state->base.state, plane, new, i) {
	struct tegra_plane *p = to_tegra_plane(plane);
	unsigned index;

	/* skip this plane and planes on different CRTCs */
	if (p == tegra \|\| p->dc != tegra->dc)
	continue;

	index = tegra_plane_get_overlap_index(tegra, p);

	if (new->fb && __drm_format_has_alpha(new->fb->format->format))
	state->blending[index].alpha = true;
	else
	state->blending[index].alpha = false;

	if (new->normalized_zpos > state->base.normalized_zpos)
	state->blending[index].top = true;
	else
	state->blending[index].top = false;

	/*
	* Missing framebuffer means that plane is disabled, in this
	* case mark B / C window as top to be able to differentiate
	* windows indices order in regards to zPos for the middle
	* window X / Y registers programming.
	*/
	if (!new->fb)
	state->blending[index].top = (index == 1);
	}
	}

	static int tegra_plane_setup_transparency(struct tegra_plane *tegra,
	struct tegra_plane_state *state)
	{
	struct tegra_plane_state *tegra_state;
	struct drm_plane_state *new;
	struct drm_plane *plane;
	int err;

	/*
	* If planes zpos / transparency changed, sibling planes blending
	* state may require adjustment and in this case they will be included
	* into this atom commit, otherwise blending state is unchanged.
	*/
	err = tegra_plane_check_transparency(tegra, state);
	if (err <= 0)
	return err;

	/*
	* All planes are now in the atomic state, walk them up and update
	* transparency state for each plane.
	*/
	drm_for_each_plane(plane, tegra->base.dev) {
	struct tegra_plane *p = to_tegra_plane(plane);

	/* skip planes on different CRTCs */
	if (p->dc != tegra->dc)
	continue;

	new = drm_atomic_get_new_plane_state(state->base.state, plane);
	tegra_state = to_tegra_plane_state(new);

	/*
	* There is no need to update blending state for the disabled
	* plane.
	*/
	if (new->fb)
	tegra_plane_update_transparency(p, tegra_state);
	}

	return 0;
	}

	int tegra_plane_setup_legacy_state(struct tegra_plane *tegra,
	struct tegra_plane_state *state)
	{
	int err;

	err = tegra_plane_setup_opacity(tegra, state);
	if (err < 0)
	return err;

	err = tegra_plane_setup_transparency(tegra, state);
	if (err < 0)
	return err;

	return 0;
	}