drivers/gpu/drm/exynos/exynos_drm_plane.c - linux - Git at Google

 /*
  * Copyright (C) 2011 Samsung Electronics Co.Ltd
  * Authors: Joonyoung Shim <jy0922.shim@samsung.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/drmP.h>

 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_plane_helper.h>
 #include <drm/exynos_drm.h>
 #include "exynos_drm_drv.h"
 #include "exynos_drm_crtc.h"
 #include "exynos_drm_fb.h"
 #include "exynos_drm_gem.h"
 #include "exynos_drm_plane.h"

 /*
  * This function is to get X or Y size shown via screen. This needs length and
  * start position of CRTC.
  *
  *      <--- length --->
  * CRTC ----------------
  *      ^ start        ^ end
  *
  * There are six cases from a to f.
  *
  *             <----- SCREEN ----->
  *             0                 last
  *   ----------|------------------|----------
  * CRTCs
  * a -------
  *        b -------
  *        c --------------------------
  *                 d --------
  *                           e -------
  *                                  f -------
  */
 static int exynos_plane_get_size(int start, unsigned length, unsigned last)
 {
 	int end = start + length;
 	int size = 0;

 	if (start <= 0) {
 		if (end > 0)
 			size = min_t(unsigned, end, last);
 	} else if (start <= last) {
 		size = min_t(unsigned, last - start, length);
 	}

 	return size;
 }

 static void exynos_plane_mode_set(struct exynos_drm_plane_state *exynos_state)
 {
 	struct drm_plane_state *state = &exynos_state->base;
 	struct drm_crtc *crtc = state->crtc;
 	struct drm_crtc_state *crtc_state =
 			drm_atomic_get_existing_crtc_state(state->state, crtc);
 	struct drm_display_mode *mode = &crtc_state->adjusted_mode;
 	int crtc_x, crtc_y;
 	unsigned int crtc_w, crtc_h;
 	unsigned int src_x, src_y;
 	unsigned int src_w, src_h;
 	unsigned int actual_w;
 	unsigned int actual_h;

 	/*
 	 * The original src/dest coordinates are stored in exynos_state->base,
 	 * but we want to keep another copy internal to our driver that we can
 	 * clip/modify ourselves.
 	 */

 	crtc_x = state->crtc_x;
 	crtc_y = state->crtc_y;
 	crtc_w = state->crtc_w;
 	crtc_h = state->crtc_h;

 	src_x = state->src_x >> 16;
 	src_y = state->src_y >> 16;
 	src_w = state->src_w >> 16;
 	src_h = state->src_h >> 16;

 	/* set ratio */
 	exynos_state->h_ratio = (src_w << 16) / crtc_w;
 	exynos_state->v_ratio = (src_h << 16) / crtc_h;

 	/* clip to visible area */
 	actual_w = exynos_plane_get_size(crtc_x, crtc_w, mode->hdisplay);
 	actual_h = exynos_plane_get_size(crtc_y, crtc_h, mode->vdisplay);

 	if (crtc_x < 0) {
 		if (actual_w)
 			src_x += ((-crtc_x) * exynos_state->h_ratio) >> 16;
 		crtc_x = 0;
 	}

 	if (crtc_y < 0) {
 		if (actual_h)
 			src_y += ((-crtc_y) * exynos_state->v_ratio) >> 16;
 		crtc_y = 0;
 	}

 	/* set drm framebuffer data. */
 	exynos_state->src.x = src_x;
 	exynos_state->src.y = src_y;
 	exynos_state->src.w = (actual_w * exynos_state->h_ratio) >> 16;
 	exynos_state->src.h = (actual_h * exynos_state->v_ratio) >> 16;

 	/* set plane range to be displayed. */
 	exynos_state->crtc.x = crtc_x;
 	exynos_state->crtc.y = crtc_y;
 	exynos_state->crtc.w = actual_w;
 	exynos_state->crtc.h = actual_h;

 	DRM_DEBUG_KMS("plane : offset_x/y(%d,%d), width/height(%d,%d)",
 			exynos_state->crtc.x, exynos_state->crtc.y,
 			exynos_state->crtc.w, exynos_state->crtc.h);
 }

 static void exynos_drm_plane_reset(struct drm_plane *plane)
 {
 	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 	struct exynos_drm_plane_state *exynos_state;

 	if (plane->state) {
 		exynos_state = to_exynos_plane_state(plane->state);
 		if (exynos_state->base.fb)
 			drm_framebuffer_put(exynos_state->base.fb);
 		kfree(exynos_state);
 		plane->state = NULL;
 	}

 	exynos_state = kzalloc(sizeof(*exynos_state), GFP_KERNEL);
 	if (exynos_state) {
 		plane->state = &exynos_state->base;
 		plane->state->plane = plane;
 		plane->state->zpos = exynos_plane->config->zpos;
 	}
 }

 static struct drm_plane_state *
 exynos_drm_plane_duplicate_state(struct drm_plane *plane)
 {
 	struct exynos_drm_plane_state *exynos_state;
 	struct exynos_drm_plane_state *copy;

 	exynos_state = to_exynos_plane_state(plane->state);
 	copy = kzalloc(sizeof(*exynos_state), GFP_KERNEL);
 	if (!copy)
 		return NULL;

 	__drm_atomic_helper_plane_duplicate_state(plane, &copy->base);
 	return &copy->base;
 }

 static void exynos_drm_plane_destroy_state(struct drm_plane *plane,
 					   struct drm_plane_state *old_state)
 {
 	struct exynos_drm_plane_state *old_exynos_state =
 					to_exynos_plane_state(old_state);
 	__drm_atomic_helper_plane_destroy_state(old_state);
 	kfree(old_exynos_state);
 }

 static struct drm_plane_funcs exynos_plane_funcs = {
 	.update_plane	= drm_atomic_helper_update_plane,
 	.disable_plane	= drm_atomic_helper_disable_plane,
 	.destroy	= drm_plane_cleanup,
 	.reset		= exynos_drm_plane_reset,
 	.atomic_duplicate_state = exynos_drm_plane_duplicate_state,
 	.atomic_destroy_state = exynos_drm_plane_destroy_state,
 };

 static int
 exynos_drm_plane_check_format(const struct exynos_drm_plane_config *config,
 			      struct exynos_drm_plane_state *state)
 {
 	struct drm_framebuffer *fb = state->base.fb;

 	switch (fb->modifier) {
 	case DRM_FORMAT_MOD_SAMSUNG_64_32_TILE:
 		if (!(config->capabilities & EXYNOS_DRM_PLANE_CAP_TILE))
 			return -ENOTSUPP;
 		break;

 	case DRM_FORMAT_MOD_LINEAR:
 		break;

 	default:
 		DRM_ERROR("unsupported pixel format modifier");
 		return -ENOTSUPP;
 	}

 	return 0;
 }

 static int
 exynos_drm_plane_check_size(const struct exynos_drm_plane_config *config,
 			    struct exynos_drm_plane_state *state)
 {
 	bool width_ok = false, height_ok = false;

 	if (config->capabilities & EXYNOS_DRM_PLANE_CAP_SCALE)
 		return 0;

 	if (state->src.w == state->crtc.w)
 		width_ok = true;

 	if (state->src.h == state->crtc.h)
 		height_ok = true;

 	if ((config->capabilities & EXYNOS_DRM_PLANE_CAP_DOUBLE) &&
 	    state->h_ratio == (1 << 15))
 		width_ok = true;

 	if ((config->capabilities & EXYNOS_DRM_PLANE_CAP_DOUBLE) &&
 	    state->v_ratio == (1 << 15))
 		height_ok = true;

 	if (width_ok && height_ok)
 		return 0;

 	DRM_DEBUG_KMS("scaling mode is not supported");
 	return -ENOTSUPP;
 }

 static int exynos_plane_atomic_check(struct drm_plane *plane,
 				     struct drm_plane_state *state)
 {
 	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 	struct exynos_drm_plane_state *exynos_state =
 						to_exynos_plane_state(state);
 	int ret = 0;

 	if (!state->crtc || !state->fb)
 		return 0;

 	/* translate state into exynos_state */
 	exynos_plane_mode_set(exynos_state);

 	ret = exynos_drm_plane_check_format(exynos_plane->config, exynos_state);
 	if (ret)
 		return ret;

 	ret = exynos_drm_plane_check_size(exynos_plane->config, exynos_state);
 	return ret;
 }

 static void exynos_plane_atomic_update(struct drm_plane *plane,
 				       struct drm_plane_state *old_state)
 {
 	struct drm_plane_state *state = plane->state;
 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(state->crtc);
 	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);

 	if (!state->crtc)
 		return;

 	if (exynos_crtc->ops->update_plane)
 		exynos_crtc->ops->update_plane(exynos_crtc, exynos_plane);
 }

 static void exynos_plane_atomic_disable(struct drm_plane *plane,
 					struct drm_plane_state *old_state)
 {
 	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(old_state->crtc);

 	if (!old_state->crtc)
 		return;

 	if (exynos_crtc->ops->disable_plane)
 		exynos_crtc->ops->disable_plane(exynos_crtc, exynos_plane);
 }

 static const struct drm_plane_helper_funcs plane_helper_funcs = {
 	.atomic_check = exynos_plane_atomic_check,
 	.atomic_update = exynos_plane_atomic_update,
 	.atomic_disable = exynos_plane_atomic_disable,
 };

 static void exynos_plane_attach_zpos_property(struct drm_plane *plane,
 					      int zpos, bool immutable)
 {
 	if (immutable)
 		drm_plane_create_zpos_immutable_property(plane, zpos);
 	else
 		drm_plane_create_zpos_property(plane, zpos, 0, MAX_PLANE - 1);
 }

 int exynos_plane_init(struct drm_device *dev,
 		      struct exynos_drm_plane *exynos_plane, unsigned int index,
 		      const struct exynos_drm_plane_config *config)
 {
 	int err;

 	err = drm_universal_plane_init(dev, &exynos_plane->base,
 				       1 << dev->mode_config.num_crtc,
 				       &exynos_plane_funcs,
 				       config->pixel_formats,
 				       config->num_pixel_formats,
 				       NULL, config->type, NULL);
 	if (err) {
 		DRM_ERROR("failed to initialize plane\n");
 		return err;
 	}

 	drm_plane_helper_add(&exynos_plane->base, &plane_helper_funcs);

 	exynos_plane->index = index;
 	exynos_plane->config = config;

 	exynos_plane_attach_zpos_property(&exynos_plane->base, config->zpos,
 			   !(config->capabilities & EXYNOS_DRM_PLANE_CAP_ZPOS));

 	return 0;
 }
	/*
	* Copyright (C) 2011 Samsung Electronics Co.Ltd
	* Authors: Joonyoung Shim <jy0922.shim@samsung.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/drmP.h>

	#include <drm/drm_atomic.h>
	#include <drm/drm_atomic_helper.h>
	#include <drm/drm_plane_helper.h>
	#include <drm/exynos_drm.h>
	#include "exynos_drm_drv.h"
	#include "exynos_drm_crtc.h"
	#include "exynos_drm_fb.h"
	#include "exynos_drm_gem.h"
	#include "exynos_drm_plane.h"

	/*
	* This function is to get X or Y size shown via screen. This needs length and
	* start position of CRTC.
	*
	* <--- length --->
	* CRTC ----------------
	* ^ start ^ end
	*
	* There are six cases from a to f.
	*
	* <----- SCREEN ----->
	* 0 last
	* ----------\|------------------\|----------
	* CRTCs
	* a -------
	* b -------
	* c --------------------------
	* d --------
	* e -------
	* f -------
	*/
	static int exynos_plane_get_size(int start, unsigned length, unsigned last)
	{
	int end = start + length;
	int size = 0;

	if (start <= 0) {
	if (end > 0)
	size = min_t(unsigned, end, last);
	} else if (start <= last) {
	size = min_t(unsigned, last - start, length);
	}

	return size;
	}

	static void exynos_plane_mode_set(struct exynos_drm_plane_state *exynos_state)
	{
	struct drm_plane_state *state = &exynos_state->base;
	struct drm_crtc *crtc = state->crtc;
	struct drm_crtc_state *crtc_state =
	drm_atomic_get_existing_crtc_state(state->state, crtc);
	struct drm_display_mode *mode = &crtc_state->adjusted_mode;
	int crtc_x, crtc_y;
	unsigned int crtc_w, crtc_h;
	unsigned int src_x, src_y;
	unsigned int src_w, src_h;
	unsigned int actual_w;
	unsigned int actual_h;

	/*
	* The original src/dest coordinates are stored in exynos_state->base,
	* but we want to keep another copy internal to our driver that we can
	* clip/modify ourselves.
	*/

	crtc_x = state->crtc_x;
	crtc_y = state->crtc_y;
	crtc_w = state->crtc_w;
	crtc_h = state->crtc_h;

	src_x = state->src_x >> 16;
	src_y = state->src_y >> 16;
	src_w = state->src_w >> 16;
	src_h = state->src_h >> 16;

	/* set ratio */
	exynos_state->h_ratio = (src_w << 16) / crtc_w;
	exynos_state->v_ratio = (src_h << 16) / crtc_h;

	/* clip to visible area */
	actual_w = exynos_plane_get_size(crtc_x, crtc_w, mode->hdisplay);
	actual_h = exynos_plane_get_size(crtc_y, crtc_h, mode->vdisplay);

	if (crtc_x < 0) {
	if (actual_w)
	src_x += ((-crtc_x) * exynos_state->h_ratio) >> 16;
	crtc_x = 0;
	}

	if (crtc_y < 0) {
	if (actual_h)
	src_y += ((-crtc_y) * exynos_state->v_ratio) >> 16;
	crtc_y = 0;
	}

	/* set drm framebuffer data. */
	exynos_state->src.x = src_x;
	exynos_state->src.y = src_y;
	exynos_state->src.w = (actual_w * exynos_state->h_ratio) >> 16;
	exynos_state->src.h = (actual_h * exynos_state->v_ratio) >> 16;

	/* set plane range to be displayed. */
	exynos_state->crtc.x = crtc_x;
	exynos_state->crtc.y = crtc_y;
	exynos_state->crtc.w = actual_w;
	exynos_state->crtc.h = actual_h;

	DRM_DEBUG_KMS("plane : offset_x/y(%d,%d), width/height(%d,%d)",
	exynos_state->crtc.x, exynos_state->crtc.y,
	exynos_state->crtc.w, exynos_state->crtc.h);
	}

	static void exynos_drm_plane_reset(struct drm_plane *plane)
	{
	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
	struct exynos_drm_plane_state *exynos_state;

	if (plane->state) {
	exynos_state = to_exynos_plane_state(plane->state);
	if (exynos_state->base.fb)
	drm_framebuffer_put(exynos_state->base.fb);
	kfree(exynos_state);
	plane->state = NULL;
	}

	exynos_state = kzalloc(sizeof(*exynos_state), GFP_KERNEL);
	if (exynos_state) {
	plane->state = &exynos_state->base;
	plane->state->plane = plane;
	plane->state->zpos = exynos_plane->config->zpos;
	}
	}

	static struct drm_plane_state *
	exynos_drm_plane_duplicate_state(struct drm_plane *plane)
	{
	struct exynos_drm_plane_state *exynos_state;
	struct exynos_drm_plane_state *copy;

	exynos_state = to_exynos_plane_state(plane->state);
	copy = kzalloc(sizeof(*exynos_state), GFP_KERNEL);
	if (!copy)
	return NULL;

	__drm_atomic_helper_plane_duplicate_state(plane, &copy->base);
	return &copy->base;
	}

	static void exynos_drm_plane_destroy_state(struct drm_plane *plane,
	struct drm_plane_state *old_state)
	{
	struct exynos_drm_plane_state *old_exynos_state =
	to_exynos_plane_state(old_state);
	__drm_atomic_helper_plane_destroy_state(old_state);
	kfree(old_exynos_state);
	}

	static struct drm_plane_funcs exynos_plane_funcs = {
	.update_plane = drm_atomic_helper_update_plane,
	.disable_plane = drm_atomic_helper_disable_plane,
	.destroy = drm_plane_cleanup,
	.reset = exynos_drm_plane_reset,
	.atomic_duplicate_state = exynos_drm_plane_duplicate_state,
	.atomic_destroy_state = exynos_drm_plane_destroy_state,
	};

	static int
	exynos_drm_plane_check_format(const struct exynos_drm_plane_config *config,
	struct exynos_drm_plane_state *state)
	{
	struct drm_framebuffer *fb = state->base.fb;

	switch (fb->modifier) {
	case DRM_FORMAT_MOD_SAMSUNG_64_32_TILE:
	if (!(config->capabilities & EXYNOS_DRM_PLANE_CAP_TILE))
	return -ENOTSUPP;
	break;

	case DRM_FORMAT_MOD_LINEAR:
	break;

	default:
	DRM_ERROR("unsupported pixel format modifier");
	return -ENOTSUPP;
	}

	return 0;
	}

	static int
	exynos_drm_plane_check_size(const struct exynos_drm_plane_config *config,
	struct exynos_drm_plane_state *state)
	{
	bool width_ok = false, height_ok = false;

	if (config->capabilities & EXYNOS_DRM_PLANE_CAP_SCALE)
	return 0;

	if (state->src.w == state->crtc.w)
	width_ok = true;

	if (state->src.h == state->crtc.h)
	height_ok = true;

	if ((config->capabilities & EXYNOS_DRM_PLANE_CAP_DOUBLE) &&
	state->h_ratio == (1 << 15))
	width_ok = true;

	if ((config->capabilities & EXYNOS_DRM_PLANE_CAP_DOUBLE) &&
	state->v_ratio == (1 << 15))
	height_ok = true;

	if (width_ok && height_ok)
	return 0;

	DRM_DEBUG_KMS("scaling mode is not supported");
	return -ENOTSUPP;
	}

	static int exynos_plane_atomic_check(struct drm_plane *plane,
	struct drm_plane_state *state)
	{
	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
	struct exynos_drm_plane_state *exynos_state =
	to_exynos_plane_state(state);
	int ret = 0;

	if (!state->crtc \|\| !state->fb)
	return 0;

	/* translate state into exynos_state */
	exynos_plane_mode_set(exynos_state);

	ret = exynos_drm_plane_check_format(exynos_plane->config, exynos_state);
	if (ret)
	return ret;

	ret = exynos_drm_plane_check_size(exynos_plane->config, exynos_state);
	return ret;
	}

	static void exynos_plane_atomic_update(struct drm_plane *plane,
	struct drm_plane_state *old_state)
	{
	struct drm_plane_state *state = plane->state;
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(state->crtc);
	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);

	if (!state->crtc)
	return;

	if (exynos_crtc->ops->update_plane)
	exynos_crtc->ops->update_plane(exynos_crtc, exynos_plane);
	}

	static void exynos_plane_atomic_disable(struct drm_plane *plane,
	struct drm_plane_state *old_state)
	{
	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(old_state->crtc);

	if (!old_state->crtc)
	return;

	if (exynos_crtc->ops->disable_plane)
	exynos_crtc->ops->disable_plane(exynos_crtc, exynos_plane);
	}

	static const struct drm_plane_helper_funcs plane_helper_funcs = {
	.atomic_check = exynos_plane_atomic_check,
	.atomic_update = exynos_plane_atomic_update,
	.atomic_disable = exynos_plane_atomic_disable,
	};

	static void exynos_plane_attach_zpos_property(struct drm_plane *plane,
	int zpos, bool immutable)
	{
	if (immutable)
	drm_plane_create_zpos_immutable_property(plane, zpos);
	else
	drm_plane_create_zpos_property(plane, zpos, 0, MAX_PLANE - 1);
	}

	int exynos_plane_init(struct drm_device *dev,
	struct exynos_drm_plane *exynos_plane, unsigned int index,
	const struct exynos_drm_plane_config *config)
	{
	int err;

	err = drm_universal_plane_init(dev, &exynos_plane->base,
	1 << dev->mode_config.num_crtc,
	&exynos_plane_funcs,
	config->pixel_formats,
	config->num_pixel_formats,
	NULL, config->type, NULL);
	if (err) {
	DRM_ERROR("failed to initialize plane\n");
	return err;
	}

	drm_plane_helper_add(&exynos_plane->base, &plane_helper_funcs);

	exynos_plane->index = index;
	exynos_plane->config = config;

	exynos_plane_attach_zpos_property(&exynos_plane->base, config->zpos,
	!(config->capabilities & EXYNOS_DRM_PLANE_CAP_ZPOS));

	return 0;
	}