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/*

 * Copyright 2008 Advanced Micro Devices, Inc.

 * Copyright 2008 Red Hat Inc.

 * Copyright 2009 Jerome Glisse.

 *

 * 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 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.

 *

 * Authors: Dave Airlie

 *          Alex Deucher

 *          Jerome Glisse

 */

#include 

#include "radeon.h"

#include 

#include "radeon_asic.h"

#include 

#include 

#include 

#include "radeon_kfd.h"

#if defined(CONFIG_VGA_SWITCHEROO)

bool radeon_has_atpx(void);

#else

static inline bool radeon_has_atpx(void) { return false; }

#endif

/*

 * VBlank related functions.

 */

/**

 * radeon_get_vblank_counter_kms - get frame count

 *

 * @dev: drm dev pointer

 * @pipe: crtc to get the frame count from

 *

 * Gets the frame count on the requested crtc (all asics).

 * Returns frame count on success, -EINVAL on failure.

 */

u32 radeon_get_vblank_counter_kms(struct drm_device *dev, unsigned int pipe)

{

	int vpos, hpos, stat;

	u32 count;

	struct radeon_device *rdev = dev->dev_private;

	if (pipe >= rdev->num_crtc) {

		DRM_ERROR("Invalid crtc %u\n", pipe);

		return -EINVAL;

	}

	/* The hw increments its frame counter at start of vsync, not at start

	 * of vblank, as is required by DRM core vblank counter handling.

	 * Cook the hw count here to make it appear to the caller as if it

	 * incremented at start of vblank. We measure distance to start of

	 * vblank in vpos. vpos therefore will be >= 0 between start of vblank

	 * and start of vsync, so vpos >= 0 means to bump the hw frame counter

	 * result by 1 to give the proper appearance to caller.

	 */

	if (rdev->mode_info.crtcs[pipe]) {

		/* Repeat readout if needed to provide stable result if

		 * we cross start of vsync during the queries.

		 */

		do {

			count = radeon_get_vblank_counter(rdev, pipe);

			/* Ask radeon_get_crtc_scanoutpos to return vpos as

			 * distance to start of vblank, instead of regular

			 * vertical scanout pos.

			 */

			stat = radeon_get_crtc_scanoutpos(

				dev, pipe, GET_DISTANCE_TO_VBLANKSTART,

				&vpos, &hpos, NULL, NULL,

				&rdev->mode_info.crtcs[pipe]->base.hwmode);

		} while (count != radeon_get_vblank_counter(rdev, pipe));

		if (((stat & (DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_ACCURATE)) !=

		    (DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_ACCURATE))) {

			DRM_DEBUG_VBL("Query failed! stat %d\n", stat);

		}

		else {

			DRM_DEBUG_VBL("crtc %u: dist from vblank start %d\n",

				      pipe, vpos);

			/* Bump counter if we are at >= leading edge of vblank,

			 * but before vsync where vpos would turn negative and

			 * the hw counter really increments.

			 */

			if (vpos >= 0)

				count++;

		}

	}

	else {

	    /* Fallback to use value as is. */

	    count = radeon_get_vblank_counter(rdev, pipe);

	    DRM_DEBUG_VBL("NULL mode info! Returned count may be wrong.\n");

	}

	return count;

}

/**

 * radeon_enable_vblank_kms - enable vblank interrupt

 *

 * @dev: drm dev pointer

 * @crtc: crtc to enable vblank interrupt for

 *

 * Enable the interrupt on the requested crtc (all asics).

 * Returns 0 on success, -EINVAL on failure.

 */

int radeon_enable_vblank_kms(struct drm_device *dev, int crtc)

{

	struct radeon_device *rdev = dev->dev_private;

	unsigned long irqflags;

	int r;

	if (crtc < 0 || crtc >= rdev->num_crtc) {

		DRM_ERROR("Invalid crtc %d\n", crtc);

		return -EINVAL;

	}

	spin_lock_irqsave(&rdev->irq.lock, irqflags);

	rdev->irq.crtc_vblank_int[crtc] = true;

	r = radeon_irq_set(rdev);

	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);

	return r;

}

/**

 * radeon_disable_vblank_kms - disable vblank interrupt

 *

 * @dev: drm dev pointer

 * @crtc: crtc to disable vblank interrupt for

 *

 * Disable the interrupt on the requested crtc (all asics).

 */

void radeon_disable_vblank_kms(struct drm_device *dev, int crtc)

{

	struct radeon_device *rdev = dev->dev_private;

	unsigned long irqflags;

	if (crtc < 0 || crtc >= rdev->num_crtc) {

		DRM_ERROR("Invalid crtc %d\n", crtc);

		return;

	}

	spin_lock_irqsave(&rdev->irq.lock, irqflags);

	rdev->irq.crtc_vblank_int[crtc] = false;

	radeon_irq_set(rdev);

	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);

}

/**

 * radeon_get_vblank_timestamp_kms - get vblank timestamp

 *

 * @dev: drm dev pointer

 * @crtc: crtc to get the timestamp for

 * @max_error: max error

 * @vblank_time: time value

 * @flags: flags passed to the driver

 *

 * Gets the timestamp on the requested crtc based on the

 * scanout position.  (all asics).

 * Returns postive status flags on success, negative error on failure.

 */

int radeon_get_vblank_timestamp_kms(struct drm_device *dev, int crtc,

				    int *max_error,

				    struct timeval *vblank_time,

				    unsigned flags)

{

	struct drm_crtc *drmcrtc;

	struct radeon_device *rdev = dev->dev_private;

	if (crtc < 0 || crtc >= dev->num_crtcs) {

		DRM_ERROR("Invalid crtc %d\n", crtc);

		return -EINVAL;

	}

	/* Get associated drm_crtc: */

	drmcrtc = &rdev->mode_info.crtcs[crtc]->base;

	if (!drmcrtc)

		return -EINVAL;

	/* Helper routine in DRM core does all the work: */

	return drm_calc_vbltimestamp_from_scanoutpos(dev, crtc, max_error,

						     vblank_time, flags,

						     &drmcrtc->hwmode);

}