linux/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c

/*
 * Copyright 2007-8 Advanced Micro Devices, Inc.
 * Copyright 2008 Red Hat Inc.
 *
 * 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
 */
#include <drm/drmP.h>
#include <drm/amdgpu_drm.h>
#include "amdgpu.h"
#include "amdgpu_i2c.h"
#include "atom.h"
#include "amdgpu_connectors.h"
#include <asm/div64.h>

#include <linux/pm_runtime.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_edid.h>


static void amdgpu_flip_work_func(struct work_struct *__work)
{
	struct amdgpu_flip_work *work =
		container_of(__work, struct amdgpu_flip_work, flip_work);
	struct amdgpu_device *adev = work->adev;
	struct amdgpu_crtc *amdgpuCrtc = adev->mode_info.crtcs[work->crtc_id];

	struct drm_crtc *crtc = &amdgpuCrtc->base;
	struct amdgpu_fence *fence;
	unsigned long flags;
	int r;

	down_read(&adev->exclusive_lock);
	if (work->fence) {
		fence = to_amdgpu_fence(work->fence);
		if (fence) {
			r = fence_wait(&fence->base, false);
			if (r == -EDEADLK) {
				up_read(&adev->exclusive_lock);
				r = amdgpu_gpu_reset(adev);
				down_read(&adev->exclusive_lock);
			}
		} else
			r = fence_wait(work->fence, false);

		if (r)
			DRM_ERROR("failed to wait on page flip fence (%d)!\n", r);

		/* We continue with the page flip even if we failed to wait on
		 * the fence, otherwise the DRM core and userspace will be
		 * confused about which BO the CRTC is scanning out
		 */

		fence_put(work->fence);
		work->fence = NULL;
	}

	/* We borrow the event spin lock for protecting flip_status */
	spin_lock_irqsave(&crtc->dev->event_lock, flags);

	/* set the proper interrupt */
	amdgpu_irq_get(adev, &adev->pageflip_irq, work->crtc_id);
	/* do the flip (mmio) */
	adev->mode_info.funcs->page_flip(adev, work->crtc_id, work->base);
	/* set the flip status */
	amdgpuCrtc->pflip_status = AMDGPU_FLIP_SUBMITTED;

	spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
	up_read(&adev->exclusive_lock);
}

/*
 * Handle unpin events outside the interrupt handler proper.
 */
static void amdgpu_unpin_work_func(struct work_struct *__work)
{
	struct amdgpu_flip_work *work =
		container_of(__work, struct amdgpu_flip_work, unpin_work);
	int r;

	/* unpin of the old buffer */
	r = amdgpu_bo_reserve(work->old_rbo, false);
	if (likely(r == 0)) {
		r = amdgpu_bo_unpin(work->old_rbo);
		if (unlikely(r != 0)) {
			DRM_ERROR("failed to unpin buffer after flip\n");
		}
		amdgpu_bo_unreserve(work->old_rbo);
	} else
		DRM_ERROR("failed to reserve buffer after flip\n");

	drm_gem_object_unreference_unlocked(&work->old_rbo->gem_base);
	kfree(work);
}

int amdgpu_crtc_page_flip(struct drm_crtc *crtc,
			  struct drm_framebuffer *fb,
			  struct drm_pending_vblank_event *event,
			  uint32_t page_flip_flags)
{
	struct drm_device *dev = crtc->dev;
	struct amdgpu_device *adev = dev->dev_private;
	struct amdgpu_crtc *amdgpu_crtc = to_amdgpu_crtc(crtc);
	struct amdgpu_framebuffer *old_amdgpu_fb;
	struct amdgpu_framebuffer *new_amdgpu_fb;
	struct drm_gem_object *obj;
	struct amdgpu_flip_work *work;
	struct amdgpu_bo *new_rbo;
	unsigned long flags;
	u64 tiling_flags;
	u64 base;
	int r;

	work = kzalloc(sizeof *work, GFP_KERNEL);
	if (work == NULL)
		return -ENOMEM;

	INIT_WORK(&work->flip_work, amdgpu_flip_work_func);
	INIT_WORK(&work->unpin_work, amdgpu_unpin_work_func);

	work->event = event;
	work->adev = adev;
	work->crtc_id = amdgpu_crtc->crtc_id;

	/* schedule unpin of the old buffer */
	old_amdgpu_fb = to_amdgpu_framebuffer(crtc->primary->fb);
	obj = old_amdgpu_fb->obj;

	/* take a reference to the old object */
	drm_gem_object_reference(obj);
	work->old_rbo = gem_to_amdgpu_bo(obj);

	new_amdgpu_fb = to_amdgpu_framebuffer(fb);
	obj = new_amdgpu_fb->obj;
	new_rbo = gem_to_amdgpu_bo(obj);

	/* pin the new buffer */
	r = amdgpu_bo_reserve(new_rbo, false);
	if (unlikely(r != 0)) {
		DRM_ERROR("failed to reserve new rbo buffer before flip\n");
		goto cleanup;
	}

	r = amdgpu_bo_pin_restricted(new_rbo, AMDGPU_GEM_DOMAIN_VRAM, 0, 0, &base);
	if (unlikely(r != 0)) {
		amdgpu_bo_unreserve(new_rbo);
		r = -EINVAL;
		DRM_ERROR("failed to pin new rbo buffer before flip\n");
		goto cleanup;
	}

	work->fence = fence_get(reservation_object_get_excl(new_rbo->tbo.resv));
	amdgpu_bo_get_tiling_flags(new_rbo, &tiling_flags);
	amdgpu_bo_unreserve(new_rbo);

	work->base = base;

	r = drm_vblank_get(crtc->dev, amdgpu_crtc->crtc_id);
	if (r) {
		DRM_ERROR("failed to get vblank before flip\n");
		goto pflip_cleanup;
	}

	/* we borrow the event spin lock for protecting flip_wrok */
	spin_lock_irqsave(&crtc->dev->event_lock, flags);
	if (amdgpu_crtc->pflip_status != AMDGPU_FLIP_NONE) {
		DRM_DEBUG_DRIVER("flip queue: crtc already busy\n");
		spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
		r = -EBUSY;
		goto vblank_cleanup;
	}

	amdgpu_crtc->pflip_status = AMDGPU_FLIP_PENDING;
	amdgpu_crtc->pflip_works = work;

	/* update crtc fb */
	crtc->primary->fb = fb;
	spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
	queue_work(amdgpu_crtc->pflip_queue, &work->flip_work);
	return 0;

vblank_cleanup:
	drm_vblank_put(crtc->dev, amdgpu_crtc->crtc_id);

pflip_cleanup:
	if (unlikely(amdgpu_bo_reserve(new_rbo, false) != 0)) {
		DRM_ERROR("failed to reserve new rbo in error path\n");
		goto cleanup;
	}
	if (unlikely(amdgpu_bo_unpin(new_rbo) != 0)) {
		DRM_ERROR("failed to unpin new rbo in error path\n");
	}
	amdgpu_bo_unreserve(new_rbo);

cleanup:
	drm_gem_object_unreference_unlocked(&work->old_rbo->gem_base);
	fence_put(work->fence);
	kfree(work);

	return r;
}

int amdgpu_crtc_set_config(struct drm_mode_set *set)
{
	struct drm_device *dev;
	struct amdgpu_device *adev;
	struct drm_crtc *crtc;
	bool active = false;
	int ret;

	if (!set || !set->crtc)
		return -EINVAL;

	dev = set->crtc->dev;

	ret = pm_runtime_get_sync(dev->dev);
	if (ret < 0)
		return ret;

	ret = drm_crtc_helper_set_config(set);

	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
		if (crtc->enabled)
			active = true;

	pm_runtime_mark_last_busy(dev->dev);

	adev = dev->dev_private;
	/* if we have active crtcs and we don't have a power ref,
	   take the current one */
	if (active && !adev->have_disp_power_ref) {
		adev->have_disp_power_ref = true;
		return ret;
	}
	/* if we have no active crtcs, then drop the power ref
	   we got before */
	if (!active && adev->have_disp_power_ref) {
		pm_runtime_put_autosuspend(dev->dev);
		adev->have_disp_power_ref = false;
	}

	/* drop the power reference we got coming in here */
	pm_runtime_put_autosuspend(dev->dev);
	return ret;
}

static const char *encoder_names[38] = {
	"NONE",
	"INTERNAL_LVDS",
	"INTERNAL_TMDS1",
	"INTERNAL_TMDS2",
	"INTERNAL_DAC1",
	"INTERNAL_DAC2",
	"INTERNAL_SDVOA",
	"INTERNAL_SDVOB",
	"SI170B",
	"CH7303",
	"CH7301",
	"INTERNAL_DVO1",
	"EXTERNAL_SDVOA",
	"EXTERNAL_SDVOB",
	"TITFP513",
	"INTERNAL_LVTM1",
	"VT1623",
	"HDMI_SI1930",
	"HDMI_INTERNAL",
	"INTERNAL_KLDSCP_TMDS1",
	"INTERNAL_KLDSCP_DVO1",
	"INTERNAL_KLDSCP_DAC1",
	"INTERNAL_KLDSCP_DAC2",
	"SI178",
	"MVPU_FPGA",
	"INTERNAL_DDI",
	"VT1625",
	"HDMI_SI1932",
	"DP_AN9801",
	"DP_DP501",
	"INTERNAL_UNIPHY",
	"INTERNAL_KLDSCP_LVTMA",
	"INTERNAL_UNIPHY1",
	"INTERNAL_UNIPHY2",
	"NUTMEG",
	"TRAVIS",
	"INTERNAL_VCE",
	"INTERNAL_UNIPHY3",
};

static const char *hpd_names[6] = {
	"HPD1",
	"HPD2",
	"HPD3",
	"HPD4",
	"HPD5",
	"HPD6",
};

void amdgpu_print_display_setup(struct drm_device *dev)
{
	struct drm_connector *connector;
	struct amdgpu_connector *amdgpu_connector;
	struct drm_encoder *encoder;
	struct amdgpu_encoder *amdgpu_encoder;
	uint32_t devices;
	int i = 0;

	DRM_INFO("AMDGPU Display Connectors\n");
	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
		amdgpu_connector = to_amdgpu_connector(connector);
		DRM_INFO("Connector %d:\n", i);
		DRM_INFO("  %s\n", connector->name);
		if (amdgpu_connector->hpd.hpd != AMDGPU_HPD_NONE)
			DRM_INFO("  %s\n", hpd_names[amdgpu_connector->hpd.hpd]);
		if (amdgpu_connector->ddc_bus) {
			DRM_INFO("  DDC: 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n",
				 amdgpu_connector->ddc_bus->rec.mask_clk_reg,
				 amdgpu_connector->ddc_bus->rec.mask_data_reg,
				 amdgpu_connector->ddc_bus->rec.a_clk_reg,
				 amdgpu_connector->ddc_bus->rec.a_data_reg,
				 amdgpu_connector->ddc_bus->rec.en_clk_reg,
				 amdgpu_connector->ddc_bus->rec.en_data_reg,
				 amdgpu_connector->ddc_bus->rec.y_clk_reg,
				 amdgpu_connector->ddc_bus->rec.y_data_reg);
			if (amdgpu_connector->router.ddc_valid)
				DRM_INFO("  DDC Router 0x%x/0x%x\n",
					 amdgpu_connector->router.ddc_mux_control_pin,
					 amdgpu_connector->router.ddc_mux_state);
			if (amdgpu_connector->router.cd_valid)
				DRM_INFO("  Clock/Data Router 0x%x/0x%x\n",
					 amdgpu_connector->router.cd_mux_control_pin,
					 amdgpu_connector->router.cd_mux_state);
		} else {
			if (connector->connector_type == DRM_MODE_CONNECTOR_VGA ||
			    connector->connector_type == DRM_MODE_CONNECTOR_DVII ||
			    connector->connector_type == DRM_MODE_CONNECTOR_DVID ||
			    connector->connector_type == DRM_MODE_CONNECTOR_DVIA ||
			    connector->connector_type == DRM_MODE_CONNECTOR_HDMIA ||
			    connector->connector_type == DRM_MODE_CONNECTOR_HDMIB)
				DRM_INFO("  DDC: no ddc bus - possible BIOS bug - please report to xorg-driver-ati@lists.x.org\n");
		}
		DRM_INFO("  Encoders:\n");
		list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
			amdgpu_encoder = to_amdgpu_encoder(encoder);
			devices = amdgpu_encoder->devices & amdgpu_connector->devices;
			if (devices) {
				if (devices & ATOM_DEVICE_CRT1_SUPPORT)
					DRM_INFO("    CRT1: %s\n", encoder_names[amdgpu_encoder->encoder_id]);
				if (devices & ATOM_DEVICE_CRT2_SUPPORT)
					DRM_INFO("    CRT2: %s\n", encoder_names[amdgpu_encoder->encoder_id]);
				if (devices & ATOM_DEVICE_LCD1_SUPPORT)
					DRM_INFO("    LCD1: %s\n", encoder_names[amdgpu_encoder->encoder_id]);
				if (devices & ATOM_DEVICE_DFP1_SUPPORT)
					DRM_INFO("    DFP1: %s\n", encoder_names[amdgpu_encoder->encoder_id]);
				if (devices & ATOM_DEVICE_DFP2_SUPPORT)
					DRM_INFO("    DFP2: %s\n", encoder_names[amdgpu_encoder->encoder_id]);
				if (devices & ATOM_DEVICE_DFP3_SUPPORT)
					DRM_INFO("    DFP3: %s\n", encoder_names[amdgpu_encoder->encoder_id]);
				if (devices & ATOM_DEVICE_DFP4_SUPPORT)
					DRM_INFO("    DFP4: %s\n", encoder_names[amdgpu_encoder->encoder_id]);
				if (devices & ATOM_DEVICE_DFP5_SUPPORT)
					DRM_INFO("    DFP5: %s\n", encoder_names[amdgpu_encoder->encoder_id]);
				if (devices & ATOM_DEVICE_DFP6_SUPPORT)
					DRM_INFO("    DFP6: %s\n", encoder_names[amdgpu_encoder->encoder_id]);
				if (devices & ATOM_DEVICE_TV1_SUPPORT)
					DRM_INFO("    TV1: %s\n", encoder_names[amdgpu_encoder->encoder_id]);
				if (devices & ATOM_DEVICE_CV_SUPPORT)
					DRM_INFO("    CV: %s\n", encoder_names[amdgpu_encoder->encoder_id]);
			}
		}
		i++;
	}
}

/**
 * amdgpu_ddc_probe
 *
 */
bool amdgpu_ddc_probe(struct amdgpu_connector *amdgpu_connector,
		       bool use_aux)
{
	u8 out = 0x0;
	u8 buf[8];
	int ret;
	struct i2c_msg msgs[] = {
		{
			.addr = DDC_ADDR,
			.flags = 0,
			.len = 1,
			.buf = &out,
		},
		{
			.addr = DDC_ADDR,
			.flags = I2C_M_RD,
			.len = 8,
			.buf = buf,
		}
	};

	/* on hw with routers, select right port */
	if (amdgpu_connector->router.ddc_valid)
		amdgpu_i2c_router_select_ddc_port(amdgpu_connector);

	if (use_aux) {
		ret = i2c_transfer(&amdgpu_connector->ddc_bus->aux.ddc, msgs, 2);
	} else {
		ret = i2c_transfer(&amdgpu_connector->ddc_bus->adapter, msgs, 2);
	}

	if (ret != 2)
		/* Couldn't find an accessible DDC on this connector */
		return false;
	/* Probe also for valid EDID header
	 * EDID header starts with:
	 * 0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00.
	 * Only the first 6 bytes must be valid as
	 * drm_edid_block_valid() can fix the last 2 bytes */
	if (drm_edid_header_is_valid(buf) < 6) {
		/* Couldn't find an accessible EDID on this
		 * connector */
		return false;
	}
	return true;
}

static void amdgpu_user_framebuffer_destroy(struct drm_framebuffer *fb)
{
	struct amdgpu_framebuffer *amdgpu_fb = to_amdgpu_framebuffer(fb);

	if (amdgpu_fb->obj) {
		drm_gem_object_unreference_unlocked(amdgpu_fb->obj);
	}
	drm_framebuffer_cleanup(fb);
	kfree(amdgpu_fb);
}

static int amdgpu_user_framebuffer_create_handle(struct drm_framebuffer *fb,
						  struct drm_file *file_priv,
						  unsigned int *handle)
{
	struct amdgpu_framebuffer *amdgpu_fb = to_amdgpu_framebuffer(fb);

	return drm_gem_handle_create(file_priv, amdgpu_fb->obj, handle);
}

static const struct drm_framebuffer_funcs amdgpu_fb_funcs = {
	.destroy = amdgpu_user_framebuffer_destroy,
	.create_handle = amdgpu_user_framebuffer_create_handle,
};

int
amdgpu_framebuffer_init(struct drm_device *dev,
			struct amdgpu_framebuffer *rfb,
			struct drm_mode_fb_cmd2 *mode_cmd,
			struct drm_gem_object *obj)
{
	int ret;
	rfb->obj = obj;
	drm_helper_mode_fill_fb_struct(&rfb->base, mode_cmd);
	ret = drm_framebuffer_init(dev, &rfb->base, &amdgpu_fb_funcs);
	if (ret) {
		rfb->obj = NULL;
		return ret;
	}
	return 0;
}

static struct drm_framebuffer *
amdgpu_user_framebuffer_create(struct drm_device *dev,
			       struct drm_file *file_priv,
			       struct drm_mode_fb_cmd2 *mode_cmd)
{
	struct drm_gem_object *obj;
	struct amdgpu_framebuffer *amdgpu_fb;
	int ret;

	obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[0]);
	if (obj ==  NULL) {
		dev_err(&dev->pdev->dev, "No GEM object associated to handle 0x%08X, "
			"can't create framebuffer\n", mode_cmd->handles[0]);
		return ERR_PTR(-ENOENT);
	}

	amdgpu_fb = kzalloc(sizeof(*amdgpu_fb), GFP_KERNEL);
	if (amdgpu_fb == NULL) {
		drm_gem_object_unreference_unlocked(obj);
		return ERR_PTR(-ENOMEM);
	}

	ret = amdgpu_framebuffer_init(dev, amdgpu_fb, mode_cmd, obj);
	if (ret) {
		kfree(amdgpu_fb);
		drm_gem_object_unreference_unlocked(obj);
		return ERR_PTR(ret);
	}

	return &amdgpu_fb->base;
}

static void amdgpu_output_poll_changed(struct drm_device *dev)
{
	struct amdgpu_device *adev = dev->dev_private;
	amdgpu_fb_output_poll_changed(adev);
}

const struct drm_mode_config_funcs amdgpu_mode_funcs = {
	.fb_create = amdgpu_user_framebuffer_create,
	.output_poll_changed = amdgpu_output_poll_changed
};

static struct drm_prop_enum_list amdgpu_underscan_enum_list[] =
{	{ UNDERSCAN_OFF, "off" },
	{ UNDERSCAN_ON, "on" },
	{ UNDERSCAN_AUTO, "auto" },
};

static struct drm_prop_enum_list amdgpu_audio_enum_list[] =
{	{ AMDGPU_AUDIO_DISABLE, "off" },
	{ AMDGPU_AUDIO_ENABLE, "on" },
	{ AMDGPU_AUDIO_AUTO, "auto" },
};

/* XXX support different dither options? spatial, temporal, both, etc. */
static struct drm_prop_enum_list amdgpu_dither_enum_list[] =
{	{ AMDGPU_FMT_DITHER_DISABLE, "off" },
	{ AMDGPU_FMT_DITHER_ENABLE, "on" },
};

int amdgpu_modeset_create_props(struct amdgpu_device *adev)
{
	int sz;

	if (adev->is_atom_bios) {
		adev->mode_info.coherent_mode_property =
			drm_property_create_range(adev->ddev, 0 , "coherent", 0, 1);
		if (!adev->mode_info.coherent_mode_property)
			return -ENOMEM;
	}

	adev->mode_info.load_detect_property =
		drm_property_create_range(adev->ddev, 0, "load detection", 0, 1);
	if (!adev->mode_info.load_detect_property)
		return -ENOMEM;

	drm_mode_create_scaling_mode_property(adev->ddev);

	sz = ARRAY_SIZE(amdgpu_underscan_enum_list);
	adev->mode_info.underscan_property =
		drm_property_create_enum(adev->ddev, 0,
				    "underscan",
				    amdgpu_underscan_enum_list, sz);

	adev->mode_info.underscan_hborder_property =
		drm_property_create_range(adev->ddev, 0,
					"underscan hborder", 0, 128);
	if (!adev->mode_info.underscan_hborder_property)
		return -ENOMEM;

	adev->mode_info.underscan_vborder_property =
		drm_property_create_range(adev->ddev, 0,
					"underscan vborder", 0, 128);
	if (!adev->mode_info.underscan_vborder_property)
		return -ENOMEM;

	sz = ARRAY_SIZE(amdgpu_audio_enum_list);
	adev->mode_info.audio_property =
		drm_property_create_enum(adev->ddev, 0,
					 "audio",
					 amdgpu_audio_enum_list, sz);

	sz = ARRAY_SIZE(amdgpu_dither_enum_list);
	adev->mode_info.dither_property =
		drm_property_create_enum(adev->ddev, 0,
					 "dither",
					 amdgpu_dither_enum_list, sz);

	return 0;
}

void amdgpu_update_display_priority(struct amdgpu_device *adev)
{
	/* adjustment options for the display watermarks */
	if ((amdgpu_disp_priority == 0) || (amdgpu_disp_priority > 2))
		adev->mode_info.disp_priority = 0;
	else
		adev->mode_info.disp_priority = amdgpu_disp_priority;

}

static bool is_hdtv_mode(const struct drm_display_mode *mode)
{
	/* try and guess if this is a tv or a monitor */
	if ((mode->vdisplay == 480 && mode->hdisplay == 720) || /* 480p */
	    (mode->vdisplay == 576) || /* 576p */
	    (mode->vdisplay == 720) || /* 720p */
	    (mode->vdisplay == 1080)) /* 1080p */
		return true;
	else
		return false;
}

bool amdgpu_crtc_scaling_mode_fixup(struct drm_crtc *crtc,
				    const struct drm_display_mode *mode,
				    struct drm_display_mode *adjusted_mode)
{
	struct drm_device *dev = crtc->dev;
	struct drm_encoder *encoder;
	struct amdgpu_crtc *amdgpu_crtc = to_amdgpu_crtc(crtc);
	struct amdgpu_encoder *amdgpu_encoder;
	struct drm_connector *connector;
	struct amdgpu_connector *amdgpu_connector;
	u32 src_v = 1, dst_v = 1;
	u32 src_h = 1, dst_h = 1;

	amdgpu_crtc->h_border = 0;
	amdgpu_crtc->v_border = 0;

	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
		if (encoder->crtc != crtc)
			continue;
		amdgpu_encoder = to_amdgpu_encoder(encoder);
		connector = amdgpu_get_connector_for_encoder(encoder);
		amdgpu_connector = to_amdgpu_connector(connector);

		/* set scaling */
		if (amdgpu_encoder->rmx_type == RMX_OFF)
			amdgpu_crtc->rmx_type = RMX_OFF;
		else if (mode->hdisplay < amdgpu_encoder->native_mode.hdisplay ||
			 mode->vdisplay < amdgpu_encoder->native_mode.vdisplay)
			amdgpu_crtc->rmx_type = amdgpu_encoder->rmx_type;
		else
			amdgpu_crtc->rmx_type = RMX_OFF;
		/* copy native mode */
		memcpy(&amdgpu_crtc->native_mode,
		       &amdgpu_encoder->native_mode,
		       sizeof(struct drm_display_mode));
		src_v = crtc->mode.vdisplay;
		dst_v = amdgpu_crtc->native_mode.vdisplay;
		src_h = crtc->mode.hdisplay;
		dst_h = amdgpu_crtc->native_mode.hdisplay;

		/* fix up for overscan on hdmi */
		if ((!(mode->flags & DRM_MODE_FLAG_INTERLACE)) &&
		    ((amdgpu_encoder->underscan_type == UNDERSCAN_ON) ||
		     ((amdgpu_encoder->underscan_type == UNDERSCAN_AUTO) &&
		      drm_detect_hdmi_monitor(amdgpu_connector_edid(connector)) &&
		      is_hdtv_mode(mode)))) {
			if (amdgpu_encoder->underscan_hborder != 0)
				amdgpu_crtc->h_border = amdgpu_encoder->underscan_hborder;
			else
				amdgpu_crtc->h_border = (mode->hdisplay >> 5) + 16;
			if (amdgpu_encoder->underscan_vborder != 0)
				amdgpu_crtc->v_border = amdgpu_encoder->underscan_vborder;
			else
				amdgpu_crtc->v_border = (mode->vdisplay >> 5) + 16;
			amdgpu_crtc->rmx_type = RMX_FULL;
			src_v = crtc->mode.vdisplay;
			dst_v = crtc->mode.vdisplay - (amdgpu_crtc->v_border * 2);
			src_h = crtc->mode.hdisplay;
			dst_h = crtc->mode.hdisplay - (amdgpu_crtc->h_border * 2);
		}
	}
	if (amdgpu_crtc->rmx_type != RMX_OFF) {
		fixed20_12 a, b;
		a.full = dfixed_const(src_v);
		b.full = dfixed_const(dst_v);
		amdgpu_crtc->vsc.full = dfixed_div(a, b);
		a.full = dfixed_const(src_h);
		b.full = dfixed_const(dst_h);
		amdgpu_crtc->hsc.full = dfixed_div(a, b);
	} else {
		amdgpu_crtc->vsc.full = dfixed_const(1);
		amdgpu_crtc->hsc.full = dfixed_const(1);
	}
	return true;
}

/*
 * Retrieve current video scanout position of crtc on a given gpu, and
 * an optional accurate timestamp of when query happened.
 *
 * \param dev Device to query.
 * \param crtc Crtc to query.
 * \param flags Flags from caller (DRM_CALLED_FROM_VBLIRQ or 0).
 * \param *vpos Location where vertical scanout position should be stored.
 * \param *hpos Location where horizontal scanout position should go.
 * \param *stime Target location for timestamp taken immediately before
 *               scanout position query. Can be NULL to skip timestamp.
 * \param *etime Target location for timestamp taken immediately after
 *               scanout position query. Can be NULL to skip timestamp.
 *
 * Returns vpos as a positive number while in active scanout area.
 * Returns vpos as a negative number inside vblank, counting the number
 * of scanlines to go until end of vblank, e.g., -1 means "one scanline
 * until start of active scanout / end of vblank."
 *
 * \return Flags, or'ed together as follows:
 *
 * DRM_SCANOUTPOS_VALID = Query successful.
 * DRM_SCANOUTPOS_INVBL = Inside vblank.
 * DRM_SCANOUTPOS_ACCURATE = Returned position is accurate. A lack of
 * this flag means that returned position may be offset by a constant but
 * unknown small number of scanlines wrt. real scanout position.
 *
 */
int amdgpu_get_crtc_scanoutpos(struct drm_device *dev, int crtc, unsigned int flags,
			       int *vpos, int *hpos, ktime_t *stime, ktime_t *etime)
{
	u32 vbl = 0, position = 0;
	int vbl_start, vbl_end, vtotal, ret = 0;
	bool in_vbl = true;

	struct amdgpu_device *adev = dev->dev_private;

	/* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */

	/* Get optional system timestamp before query. */
	if (stime)
		*stime = ktime_get();

	if (amdgpu_display_page_flip_get_scanoutpos(adev, crtc, &vbl, &position) == 0)
		ret |= DRM_SCANOUTPOS_VALID;

	/* Get optional system timestamp after query. */
	if (etime)
		*etime = ktime_get();

	/* preempt_enable_rt() should go right here in PREEMPT_RT patchset. */

	/* Decode into vertical and horizontal scanout position. */
	*vpos = position & 0x1fff;
	*hpos = (position >> 16) & 0x1fff;

	/* Valid vblank area boundaries from gpu retrieved? */
	if (vbl > 0) {
		/* Yes: Decode. */
		ret |= DRM_SCANOUTPOS_ACCURATE;
		vbl_start = vbl & 0x1fff;
		vbl_end = (vbl >> 16) & 0x1fff;
	}
	else {
		/* No: Fake something reasonable which gives at least ok results. */
		vbl_start = adev->mode_info.crtcs[crtc]->base.hwmode.crtc_vdisplay;
		vbl_end = 0;
	}

	/* Test scanout position against vblank region. */
	if ((*vpos < vbl_start) && (*vpos >= vbl_end))
		in_vbl = false;

	/* Check if inside vblank area and apply corrective offsets:
	 * vpos will then be >=0 in video scanout area, but negative
	 * within vblank area, counting down the number of lines until
	 * start of scanout.
	 */

	/* Inside "upper part" of vblank area? Apply corrective offset if so: */
	if (in_vbl && (*vpos >= vbl_start)) {
		vtotal = adev->mode_info.crtcs[crtc]->base.hwmode.crtc_vtotal;
		*vpos = *vpos - vtotal;
	}

	/* Correct for shifted end of vbl at vbl_end. */
	*vpos = *vpos - vbl_end;

	/* In vblank? */
	if (in_vbl)
		ret |= DRM_SCANOUTPOS_IN_VBLANK;

	/* Is vpos outside nominal vblank area, but less than
	 * 1/100 of a frame height away from start of vblank?
	 * If so, assume this isn't a massively delayed vblank
	 * interrupt, but a vblank interrupt that fired a few
	 * microseconds before true start of vblank. Compensate
	 * by adding a full frame duration to the final timestamp.
	 * Happens, e.g., on ATI R500, R600.
	 *
	 * We only do this if DRM_CALLED_FROM_VBLIRQ.
	 */
	if ((flags & DRM_CALLED_FROM_VBLIRQ) && !in_vbl) {
		vbl_start = adev->mode_info.crtcs[crtc]->base.hwmode.crtc_vdisplay;
		vtotal = adev->mode_info.crtcs[crtc]->base.hwmode.crtc_vtotal;

		if (vbl_start - *vpos < vtotal / 100) {
			*vpos -= vtotal;

			/* Signal this correction as "applied". */
			ret |= 0x8;
		}
	}

	return ret;
}

int amdgpu_crtc_idx_to_irq_type(struct amdgpu_device *adev, int crtc)
{
	if (crtc < 0 || crtc >= adev->mode_info.num_crtc)
		return AMDGPU_CRTC_IRQ_NONE;

	switch (crtc) {
	case 0:
		return AMDGPU_CRTC_IRQ_VBLANK1;
	case 1:
		return AMDGPU_CRTC_IRQ_VBLANK2;
	case 2:
		return AMDGPU_CRTC_IRQ_VBLANK3;
	case 3:
		return AMDGPU_CRTC_IRQ_VBLANK4;
	case 4:
		return AMDGPU_CRTC_IRQ_VBLANK5;
	case 5:
		return AMDGPU_CRTC_IRQ_VBLANK6;
	default:
		return AMDGPU_CRTC_IRQ_NONE;
	}
}