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/*

 * Copyright (C) 2014 Intel Corporation

 *

 * DRM universal plane helper functions

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice (including the next

 * paragraph) shall be included in all copies or substantial portions of the

 * Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

 * SOFTWARE.

 */

#include 

#include 

#include 

#include 

#include 

#define SUBPIXEL_MASK 0xffff

/*

 * This is the minimal list of formats that seem to be safe for modeset use

 * with all current DRM drivers.  Most hardware can actually support more

 * formats than this and drivers may specify a more accurate list when

 * creating the primary plane.  However drivers that still call

 * drm_plane_init() will use this minimal format list as the default.

 */

static const uint32_t safe_modeset_formats[] = {

	DRM_FORMAT_XRGB8888,

	DRM_FORMAT_ARGB8888,

};

/*

 * Returns the connectors currently associated with a CRTC.  This function

 * should be called twice:  once with a NULL connector list to retrieve

 * the list size, and once with the properly allocated list to be filled in.

 */

static int get_connectors_for_crtc(struct drm_crtc *crtc,

				   struct drm_connector **connector_list,

				   int num_connectors)

{

	struct drm_device *dev = crtc->dev;

	struct drm_connector *connector;

	int count = 0;

	/*

	 * Note: Once we change the plane hooks to more fine-grained locking we

	 * need to grab the connection_mutex here to be able to make these

	 * checks.

	 */

	WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));

	list_for_each_entry(connector, &dev->mode_config.connector_list, head)

		if (connector->encoder && connector->encoder->crtc == crtc) {

			if (connector_list != NULL && count < num_connectors)

				*(connector_list++) = connector;

			count++;

		}

	return count;

}

/**

 * drm_plane_helper_check_update() - Check plane update for validity

 * @plane: plane object to update

 * @crtc: owning CRTC of owning plane

 * @fb: framebuffer to flip onto plane

 * @src: source coordinates in 16.16 fixed point

 * @dest: integer destination coordinates

 * @clip: integer clipping coordinates

 * @min_scale: minimum @src:@dest scaling factor in 16.16 fixed point

 * @max_scale: maximum @src:@dest scaling factor in 16.16 fixed point

 * @can_position: is it legal to position the plane such that it

 *                doesn't cover the entire crtc?  This will generally

 *                only be false for primary planes.

 * @can_update_disabled: can the plane be updated while the crtc

 *                       is disabled?

 * @visible: output parameter indicating whether plane is still visible after

 *           clipping

 *

 * Checks that a desired plane update is valid.  Drivers that provide

 * their own plane handling rather than helper-provided implementations may

 * still wish to call this function to avoid duplication of error checking

 * code.

 *

 * RETURNS:

 * Zero if update appears valid, error code on failure

 */

int drm_plane_helper_check_update(struct drm_plane *plane,

				    struct drm_crtc *crtc,

				    struct drm_framebuffer *fb,

				    struct drm_rect *src,

				    struct drm_rect *dest,

				    const struct drm_rect *clip,

				    int min_scale,

				    int max_scale,

				    bool can_position,

				    bool can_update_disabled,

				    bool *visible)

{

	int hscale, vscale;

	if (!crtc->enabled && !can_update_disabled) {

		DRM_DEBUG_KMS("Cannot update plane of a disabled CRTC.\n");

		return -EINVAL;

	}

	/* Check scaling */

	hscale = drm_rect_calc_hscale(src, dest, min_scale, max_scale);

	vscale = drm_rect_calc_vscale(src, dest, min_scale, max_scale);

	if (hscale < 0 || vscale < 0) {

		DRM_DEBUG_KMS("Invalid scaling of plane\n");

		return -ERANGE;

	}

	*visible = drm_rect_clip_scaled(src, dest, clip, hscale, vscale);

	if (!*visible)

		/*

		 * Plane isn't visible; some drivers can handle this

		 * so we just return success here.  Drivers that can't

		 * (including those that use the primary plane helper's

		 * update function) will return an error from their

		 * update_plane handler.

		 */

		return 0;

	if (!can_position && !drm_rect_equals(dest, clip)) {

		DRM_DEBUG_KMS("Plane must cover entire CRTC\n");

		return -EINVAL;

	}

	return 0;

}

EXPORT_SYMBOL(drm_plane_helper_check_update);

/**

 * drm_primary_helper_update() - Helper for primary plane update

 * @plane: plane object to update

 * @crtc: owning CRTC of owning plane

 * @fb: framebuffer to flip onto plane

 * @crtc_x: x offset of primary plane on crtc

 * @crtc_y: y offset of primary plane on crtc

 * @crtc_w: width of primary plane rectangle on crtc

 * @crtc_h: height of primary plane rectangle on crtc

 * @src_x: x offset of @fb for panning

 * @src_y: y offset of @fb for panning

 * @src_w: width of source rectangle in @fb

 * @src_h: height of source rectangle in @fb

 *

 * Provides a default plane update handler for primary planes.  This is handler

 * is called in response to a userspace SetPlane operation on the plane with a

 * non-NULL framebuffer.  We call the driver's modeset handler to update the

 * framebuffer.

 *

 * SetPlane() on a primary plane of a disabled CRTC is not supported, and will

 * return an error.

 *

 * Note that we make some assumptions about hardware limitations that may not be

 * true for all hardware --

 *   1) Primary plane cannot be repositioned.

 *   2) Primary plane cannot be scaled.

 *   3) Primary plane must cover the entire CRTC.

 *   4) Subpixel positioning is not supported.

 * Drivers for hardware that don't have these restrictions can provide their

 * own implementation rather than using this helper.

 *

 * RETURNS:

 * Zero on success, error code on failure

 */

int drm_primary_helper_update(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 drm_mode_set set = {

		.crtc = crtc,

		.fb = fb,

		.mode = &crtc->mode,

		.x = src_x >> 16,

		.y = src_y >> 16,

	};

	struct drm_rect src = {

		.x1 = src_x,

		.y1 = src_y,

		.x2 = src_x + src_w,

		.y2 = src_y + src_h,

	};

	struct drm_rect dest = {

		.x1 = crtc_x,

		.y1 = crtc_y,

		.x2 = crtc_x + crtc_w,

		.y2 = crtc_y + crtc_h,

	};

	const struct drm_rect clip = {

		.x2 = crtc->mode.hdisplay,

		.y2 = crtc->mode.vdisplay,

	};

	struct drm_connector **connector_list;

	int num_connectors, ret;

	bool visible;

	ret = drm_plane_helper_check_update(plane, crtc, fb,

					    &src, &dest, &clip,

					    DRM_PLANE_HELPER_NO_SCALING,

					    DRM_PLANE_HELPER_NO_SCALING,

					    false, false, &visible);

	if (ret)

		return ret;

	if (!visible)

		/*

		 * Primary plane isn't visible.  Note that unless a driver

		 * provides their own disable function, this will just

		 * wind up returning -EINVAL to userspace.

		 */

		return plane->funcs->disable_plane(plane);

	/* Find current connectors for CRTC */

	num_connectors = get_connectors_for_crtc(crtc, NULL, 0);

	BUG_ON(num_connectors == 0);

	connector_list = kzalloc(num_connectors * sizeof(*connector_list),

				 GFP_KERNEL);

	if (!connector_list)

		return -ENOMEM;

	get_connectors_for_crtc(crtc, connector_list, num_connectors);

	set.connectors = connector_list;

	set.num_connectors = num_connectors;

	/*

	 * We call set_config() directly here rather than using

	 * drm_mode_set_config_internal.  We're reprogramming the same

	 * connectors that were already in use, so we shouldn't need the extra

	 * cross-CRTC fb refcounting to accomodate stealing connectors.

	 * drm_mode_setplane() already handles the basic refcounting for the

	 * framebuffers involved in this operation.

	 */

	ret = crtc->funcs->set_config(&set);

	kfree(connector_list);

	return ret;

}

EXPORT_SYMBOL(drm_primary_helper_update);

/**

 * drm_primary_helper_disable() - Helper for primary plane disable

 * @plane: plane to disable

 *

 * Provides a default plane disable handler for primary planes.  This is handler

 * is called in response to a userspace SetPlane operation on the plane with a

 * NULL framebuffer parameter.  It unconditionally fails the disable call with

 * -EINVAL the only way to disable the primary plane without driver support is

 * to disable the entier CRTC. Which does not match the plane ->disable hook.

 *

 * Note that some hardware may be able to disable the primary plane without

 * disabling the whole CRTC.  Drivers for such hardware should provide their

 * own disable handler that disables just the primary plane (and they'll likely

 * need to provide their own update handler as well to properly re-enable a

 * disabled primary plane).

 *

 * RETURNS:

 * Unconditionally returns -EINVAL.

 */

int drm_primary_helper_disable(struct drm_plane *plane)

{

	return -EINVAL;

}

EXPORT_SYMBOL(drm_primary_helper_disable);

/**

 * drm_primary_helper_destroy() - Helper for primary plane destruction

 * @plane: plane to destroy

 *

 * Provides a default plane destroy handler for primary planes.  This handler

 * is called during CRTC destruction.  We disable the primary plane, remove

 * it from the DRM plane list, and deallocate the plane structure.

 */

void drm_primary_helper_destroy(struct drm_plane *plane)

{

	drm_plane_cleanup(plane);

	kfree(plane);

}

EXPORT_SYMBOL(drm_primary_helper_destroy);

const struct drm_plane_funcs drm_primary_helper_funcs = {

	.update_plane = drm_primary_helper_update,

	.disable_plane = drm_primary_helper_disable,

	.destroy = drm_primary_helper_destroy,

};

EXPORT_SYMBOL(drm_primary_helper_funcs);

/**

 * drm_primary_helper_create_plane() - Create a generic primary plane

 * @dev: drm device

 * @formats: pixel formats supported, or NULL for a default safe list

 * @num_formats: size of @formats; ignored if @formats is NULL

 *

 * Allocates and initializes a primary plane that can be used with the primary

 * plane helpers.  Drivers that wish to use driver-specific plane structures or

 * provide custom handler functions may perform their own allocation and

 * initialization rather than calling this function.

 */

struct drm_plane *drm_primary_helper_create_plane(struct drm_device *dev,

						  const uint32_t *formats,

						  int num_formats)

{

	struct drm_plane *primary;

	int ret;

	primary = kzalloc(sizeof(*primary), GFP_KERNEL);

	if (primary == NULL) {

		DRM_DEBUG_KMS("Failed to allocate primary plane\n");

		return NULL;

	}

	if (formats == NULL) {

		formats = safe_modeset_formats;

		num_formats = ARRAY_SIZE(safe_modeset_formats);

	}

	/* possible_crtc's will be filled in later by crtc_init */

	ret = drm_universal_plane_init(dev, primary, 0,

				       &drm_primary_helper_funcs,

			     formats, num_formats,

			     DRM_PLANE_TYPE_PRIMARY);

	if (ret) {

		kfree(primary);

		primary = NULL;

	}

	return primary;

}

EXPORT_SYMBOL(drm_primary_helper_create_plane);

/**

 * drm_crtc_init - Legacy CRTC initialization function

 * @dev: DRM device

 * @crtc: CRTC object to init

 * @funcs: callbacks for the new CRTC

 *

 * Initialize a CRTC object with a default helper-provided primary plane and no

 * cursor plane.

 *

 * Returns:

 * Zero on success, error code on failure.

 */

int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,

		  const struct drm_crtc_funcs *funcs)

{

	struct drm_plane *primary;

	primary = drm_primary_helper_create_plane(dev, NULL, 0);

	return drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs);

}

EXPORT_SYMBOL(drm_crtc_init);