drivers/gpu/drm/radeon/radeon_audio.c

/*
 * Copyright 2014 Advanced Micro Devices, 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: Slava Grigorev <slava.grigorev@amd.com>
 */

#include <linux/gcd.h>
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include "radeon.h"
#include "atom.h"
#include "radeon_audio.h"

void r600_audio_enable(struct radeon_device *rdev, struct r600_audio_pin *pin,
		u8 enable_mask);
void dce4_audio_enable(struct radeon_device *rdev, struct r600_audio_pin *pin,
		u8 enable_mask);
void dce6_audio_enable(struct radeon_device *rdev, struct r600_audio_pin *pin,
		u8 enable_mask);
u32 dce6_endpoint_rreg(struct radeon_device *rdev, u32 offset, u32 reg);
void dce6_endpoint_wreg(struct radeon_device *rdev,
		u32 offset, u32 reg, u32 v);
void dce3_2_afmt_write_sad_regs(struct drm_encoder *encoder,
		struct cea_sad *sads, int sad_count);
void evergreen_hdmi_write_sad_regs(struct drm_encoder *encoder,
		struct cea_sad *sads, int sad_count);
void dce6_afmt_write_sad_regs(struct drm_encoder *encoder,
		struct cea_sad *sads, int sad_count);
void dce3_2_afmt_hdmi_write_speaker_allocation(struct drm_encoder *encoder,
		u8 *sadb, int sad_count);
void dce3_2_afmt_dp_write_speaker_allocation(struct drm_encoder *encoder,
		u8 *sadb, int sad_count);
void dce4_afmt_hdmi_write_speaker_allocation(struct drm_encoder *encoder,
		u8 *sadb, int sad_count);
void dce4_afmt_dp_write_speaker_allocation(struct drm_encoder *encoder,
		u8 *sadb, int sad_count);
void dce6_afmt_hdmi_write_speaker_allocation(struct drm_encoder *encoder,
		u8 *sadb, int sad_count);
void dce6_afmt_dp_write_speaker_allocation(struct drm_encoder *encoder,
		u8 *sadb, int sad_count);
void dce4_afmt_write_latency_fields(struct drm_encoder *encoder,
		struct drm_connector *connector, struct drm_display_mode *mode);
void dce6_afmt_write_latency_fields(struct drm_encoder *encoder,
		struct drm_connector *connector, struct drm_display_mode *mode);
struct r600_audio_pin* r600_audio_get_pin(struct radeon_device *rdev);
struct r600_audio_pin* dce6_audio_get_pin(struct radeon_device *rdev);
void dce6_afmt_select_pin(struct drm_encoder *encoder);
void r600_hdmi_audio_set_dto(struct radeon_device *rdev,
	struct radeon_crtc *crtc, unsigned int clock);
void dce3_2_audio_set_dto(struct radeon_device *rdev,
	struct radeon_crtc *crtc, unsigned int clock);
void dce4_hdmi_audio_set_dto(struct radeon_device *rdev,
	struct radeon_crtc *crtc, unsigned int clock);
void dce4_dp_audio_set_dto(struct radeon_device *rdev,
	struct radeon_crtc *crtc, unsigned int clock);
void dce6_hdmi_audio_set_dto(struct radeon_device *rdev,
	struct radeon_crtc *crtc, unsigned int clock);
void dce6_dp_audio_set_dto(struct radeon_device *rdev,
	struct radeon_crtc *crtc, unsigned int clock);
void r600_set_avi_packet(struct radeon_device *rdev, u32 offset,
	unsigned char *buffer, size_t size);
void evergreen_set_avi_packet(struct radeon_device *rdev, u32 offset,
	unsigned char *buffer, size_t size);
void r600_hdmi_update_acr(struct drm_encoder *encoder, long offset,
	const struct radeon_hdmi_acr *acr);
void dce3_2_hdmi_update_acr(struct drm_encoder *encoder, long offset,
	const struct radeon_hdmi_acr *acr);
void evergreen_hdmi_update_acr(struct drm_encoder *encoder, long offset,
	const struct radeon_hdmi_acr *acr);
void r600_set_vbi_packet(struct drm_encoder *encoder, u32 offset);
void dce4_set_vbi_packet(struct drm_encoder *encoder, u32 offset);
void dce4_hdmi_set_color_depth(struct drm_encoder *encoder,
	u32 offset, int bpc);
void r600_set_audio_packet(struct drm_encoder *encoder, u32 offset);
void dce3_2_set_audio_packet(struct drm_encoder *encoder, u32 offset);
void dce4_set_audio_packet(struct drm_encoder *encoder, u32 offset);
void r600_set_mute(struct drm_encoder *encoder, u32 offset, bool mute);
void dce3_2_set_mute(struct drm_encoder *encoder, u32 offset, bool mute);
void dce4_set_mute(struct drm_encoder *encoder, u32 offset, bool mute);
static void radeon_audio_hdmi_mode_set(struct drm_encoder *encoder,
	struct drm_display_mode *mode);
static void radeon_audio_dp_mode_set(struct drm_encoder *encoder,
	struct drm_display_mode *mode);
void r600_hdmi_enable(struct drm_encoder *encoder, bool enable);
void evergreen_hdmi_enable(struct drm_encoder *encoder, bool enable);
void evergreen_dp_enable(struct drm_encoder *encoder, bool enable);

static const u32 pin_offsets[7] =
{
	(0x5e00 - 0x5e00),
	(0x5e18 - 0x5e00),
	(0x5e30 - 0x5e00),
	(0x5e48 - 0x5e00),
	(0x5e60 - 0x5e00),
	(0x5e78 - 0x5e00),
	(0x5e90 - 0x5e00),
};

static u32 radeon_audio_rreg(struct radeon_device *rdev, u32 offset, u32 reg)
{
	return RREG32(reg);
}

static void radeon_audio_wreg(struct radeon_device *rdev, u32 offset,
		u32 reg, u32 v)
{
	WREG32(reg, v);
}

static struct radeon_audio_basic_funcs r600_funcs = {
	.endpoint_rreg = radeon_audio_rreg,
	.endpoint_wreg = radeon_audio_wreg,
	.enable = r600_audio_enable,
};

static struct radeon_audio_basic_funcs dce32_funcs = {
	.endpoint_rreg = radeon_audio_rreg,
	.endpoint_wreg = radeon_audio_wreg,
	.enable = r600_audio_enable,
};

static struct radeon_audio_basic_funcs dce4_funcs = {
	.endpoint_rreg = radeon_audio_rreg,
	.endpoint_wreg = radeon_audio_wreg,
	.enable = dce4_audio_enable,
};

static struct radeon_audio_basic_funcs dce6_funcs = {
	.endpoint_rreg = dce6_endpoint_rreg,
	.endpoint_wreg = dce6_endpoint_wreg,
	.enable = dce6_audio_enable,
};

static struct radeon_audio_funcs r600_hdmi_funcs = {
	.get_pin = r600_audio_get_pin,
	.set_dto = r600_hdmi_audio_set_dto,
	.update_acr = r600_hdmi_update_acr,
	.set_vbi_packet = r600_set_vbi_packet,
	.set_avi_packet = r600_set_avi_packet,
	.set_audio_packet = r600_set_audio_packet,
	.set_mute = r600_set_mute,
	.mode_set = radeon_audio_hdmi_mode_set,
	.dpms = r600_hdmi_enable,
};

static struct radeon_audio_funcs dce32_hdmi_funcs = {
	.get_pin = r600_audio_get_pin,
	.write_sad_regs = dce3_2_afmt_write_sad_regs,
	.write_speaker_allocation = dce3_2_afmt_hdmi_write_speaker_allocation,
	.set_dto = dce3_2_audio_set_dto,
	.update_acr = dce3_2_hdmi_update_acr,
	.set_vbi_packet = r600_set_vbi_packet,
	.set_avi_packet = r600_set_avi_packet,
	.set_audio_packet = dce3_2_set_audio_packet,
	.set_mute = dce3_2_set_mute,
	.mode_set = radeon_audio_hdmi_mode_set,
	.dpms = r600_hdmi_enable,
};

static struct radeon_audio_funcs dce32_dp_funcs = {
	.get_pin = r600_audio_get_pin,
	.write_sad_regs = dce3_2_afmt_write_sad_regs,
	.write_speaker_allocation = dce3_2_afmt_dp_write_speaker_allocation,
	.set_dto = dce3_2_audio_set_dto,
	.set_avi_packet = r600_set_avi_packet,
	.set_audio_packet = dce3_2_set_audio_packet,
};

static struct radeon_audio_funcs dce4_hdmi_funcs = {
	.get_pin = r600_audio_get_pin,
	.write_sad_regs = evergreen_hdmi_write_sad_regs,
	.write_speaker_allocation = dce4_afmt_hdmi_write_speaker_allocation,
	.write_latency_fields = dce4_afmt_write_latency_fields,
	.set_dto = dce4_hdmi_audio_set_dto,
	.update_acr = evergreen_hdmi_update_acr,
	.set_vbi_packet = dce4_set_vbi_packet,
	.set_color_depth = dce4_hdmi_set_color_depth,
	.set_avi_packet = evergreen_set_avi_packet,
	.set_audio_packet = dce4_set_audio_packet,
	.set_mute = dce4_set_mute,
	.mode_set = radeon_audio_hdmi_mode_set,
	.dpms = evergreen_hdmi_enable,
};

static struct radeon_audio_funcs dce4_dp_funcs = {
	.get_pin = r600_audio_get_pin,
	.write_sad_regs = evergreen_hdmi_write_sad_regs,
	.write_speaker_allocation = dce4_afmt_dp_write_speaker_allocation,
	.write_latency_fields = dce4_afmt_write_latency_fields,
	.set_dto = dce4_dp_audio_set_dto,
	.set_avi_packet = evergreen_set_avi_packet,
	.set_audio_packet = dce4_set_audio_packet,
	.mode_set = radeon_audio_dp_mode_set,
	.dpms = evergreen_dp_enable,
};

static struct radeon_audio_funcs dce6_hdmi_funcs = {
	.select_pin = dce6_afmt_select_pin,
	.get_pin = dce6_audio_get_pin,
	.write_sad_regs = dce6_afmt_write_sad_regs,
	.write_speaker_allocation = dce6_afmt_hdmi_write_speaker_allocation,
	.write_latency_fields = dce6_afmt_write_latency_fields,
	.set_dto = dce6_hdmi_audio_set_dto,
	.update_acr = evergreen_hdmi_update_acr,
	.set_vbi_packet = dce4_set_vbi_packet,
	.set_color_depth = dce4_hdmi_set_color_depth,
	.set_avi_packet = evergreen_set_avi_packet,
	.set_audio_packet = dce4_set_audio_packet,
	.set_mute = dce4_set_mute,
	.mode_set = radeon_audio_hdmi_mode_set,
	.dpms = evergreen_hdmi_enable,
};

static struct radeon_audio_funcs dce6_dp_funcs = {
	.select_pin = dce6_afmt_select_pin,
	.get_pin = dce6_audio_get_pin,
	.write_sad_regs = dce6_afmt_write_sad_regs,
	.write_speaker_allocation = dce6_afmt_dp_write_speaker_allocation,
	.write_latency_fields = dce6_afmt_write_latency_fields,
	.set_dto = dce6_dp_audio_set_dto,
	.set_avi_packet = evergreen_set_avi_packet,
	.set_audio_packet = dce4_set_audio_packet,
	.mode_set = radeon_audio_dp_mode_set,
	.dpms = evergreen_dp_enable,
};

static void radeon_audio_interface_init(struct radeon_device *rdev)
{
	if (ASIC_IS_DCE6(rdev)) {
		rdev->audio.funcs = &dce6_funcs;
		rdev->audio.hdmi_funcs = &dce6_hdmi_funcs;
		rdev->audio.dp_funcs = &dce6_dp_funcs;
	} else if (ASIC_IS_DCE4(rdev)) {
		rdev->audio.funcs = &dce4_funcs;
		rdev->audio.hdmi_funcs = &dce4_hdmi_funcs;
		rdev->audio.dp_funcs = &dce4_dp_funcs;
	} else if (ASIC_IS_DCE32(rdev)) {
		rdev->audio.funcs = &dce32_funcs;
		rdev->audio.hdmi_funcs = &dce32_hdmi_funcs;
		rdev->audio.dp_funcs = &dce32_dp_funcs;
	} else {
		rdev->audio.funcs = &r600_funcs;
		rdev->audio.hdmi_funcs = &r600_hdmi_funcs;
		rdev->audio.dp_funcs = 0;
	}
}

static int radeon_audio_chipset_supported(struct radeon_device *rdev)
{
	return ASIC_IS_DCE2(rdev) && !ASIC_IS_NODCE(rdev);
}

int radeon_audio_init(struct radeon_device *rdev)
{
	int i;

	if (!radeon_audio || !radeon_audio_chipset_supported(rdev))
		return 0;

	rdev->audio.enabled = true;

	if (ASIC_IS_DCE83(rdev))		/* KB: 2 streams, 3 endpoints */
		rdev->audio.num_pins = 3;
	else if (ASIC_IS_DCE81(rdev))	/* KV: 4 streams, 7 endpoints */
		rdev->audio.num_pins = 7;
	else if (ASIC_IS_DCE8(rdev))	/* BN/HW: 6 streams, 7 endpoints */
		rdev->audio.num_pins = 7;
	else if (ASIC_IS_DCE64(rdev))	/* OL: 2 streams, 2 endpoints */
		rdev->audio.num_pins = 2;
	else if (ASIC_IS_DCE61(rdev))	/* TN: 4 streams, 6 endpoints */
		rdev->audio.num_pins = 6;
	else if (ASIC_IS_DCE6(rdev))	/* SI: 6 streams, 6 endpoints */
		rdev->audio.num_pins = 6;
	else
		rdev->audio.num_pins = 1;

	for (i = 0; i < rdev->audio.num_pins; i++) {
		rdev->audio.pin[i].channels = -1;
		rdev->audio.pin[i].rate = -1;
		rdev->audio.pin[i].bits_per_sample = -1;
		rdev->audio.pin[i].status_bits = 0;
		rdev->audio.pin[i].category_code = 0;
		rdev->audio.pin[i].connected = false;
		rdev->audio.pin[i].offset = pin_offsets[i];
		rdev->audio.pin[i].id = i;
	}

	radeon_audio_interface_init(rdev);

	/* disable audio.  it will be set up later */
	for (i = 0; i < rdev->audio.num_pins; i++)
		radeon_audio_enable(rdev, &rdev->audio.pin[i], false);

	return 0;
}

u32 radeon_audio_endpoint_rreg(struct radeon_device *rdev, u32 offset, u32 reg)
{
	if (rdev->audio.funcs->endpoint_rreg)
		return rdev->audio.funcs->endpoint_rreg(rdev, offset, reg);

	return 0;
}

void radeon_audio_endpoint_wreg(struct radeon_device *rdev, u32 offset,
	u32 reg, u32 v)
{
	if (rdev->audio.funcs->endpoint_wreg)
		rdev->audio.funcs->endpoint_wreg(rdev, offset, reg, v);
}

static void radeon_audio_write_sad_regs(struct drm_encoder *encoder)
{
	struct radeon_encoder *radeon_encoder;
	struct drm_connector *connector;
	struct radeon_connector *radeon_connector = NULL;
	struct cea_sad *sads;
	int sad_count;

	list_for_each_entry(connector,
		&encoder->dev->mode_config.connector_list, head) {
		if (connector->encoder == encoder) {
			radeon_connector = to_radeon_connector(connector);
			break;
		}
	}

	if (!radeon_connector) {
		DRM_ERROR("Couldn't find encoder's connector\n");
		return;
	}

	sad_count = drm_edid_to_sad(radeon_connector_edid(connector), &sads);
	if (sad_count <= 0) {
		DRM_ERROR("Couldn't read SADs: %d\n", sad_count);
		return;
	}
	BUG_ON(!sads);

	radeon_encoder = to_radeon_encoder(encoder);

	if (radeon_encoder->audio && radeon_encoder->audio->write_sad_regs)
		radeon_encoder->audio->write_sad_regs(encoder, sads, sad_count);

	kfree(sads);
}

static void radeon_audio_write_speaker_allocation(struct drm_encoder *encoder)
{
	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
	struct drm_connector *connector;
	struct radeon_connector *radeon_connector = NULL;
	u8 *sadb = NULL;
	int sad_count;

	list_for_each_entry(connector,
			    &encoder->dev->mode_config.connector_list, head) {
		if (connector->encoder == encoder) {
			radeon_connector = to_radeon_connector(connector);
			break;
		}
	}

	if (!radeon_connector) {
		DRM_ERROR("Couldn't find encoder's connector\n");
		return;
	}

	sad_count = drm_edid_to_speaker_allocation(
		radeon_connector_edid(connector), &sadb);
	if (sad_count < 0) {
		DRM_DEBUG("Couldn't read Speaker Allocation Data Block: %d\n",
			  sad_count);
		sad_count = 0;
	}

	if (radeon_encoder->audio && radeon_encoder->audio->write_speaker_allocation)
		radeon_encoder->audio->write_speaker_allocation(encoder, sadb, sad_count);

	kfree(sadb);
}

static void radeon_audio_write_latency_fields(struct drm_encoder *encoder,
	struct drm_display_mode *mode)
{
	struct radeon_encoder *radeon_encoder;
	struct drm_connector *connector;
	struct radeon_connector *radeon_connector = 0;

	list_for_each_entry(connector,
		&encoder->dev->mode_config.connector_list, head) {
		if (connector->encoder == encoder) {
			radeon_connector = to_radeon_connector(connector);
			break;
		}
	}

	if (!radeon_connector) {
		DRM_ERROR("Couldn't find encoder's connector\n");
		return;
	}

	radeon_encoder = to_radeon_encoder(encoder);

	if (radeon_encoder->audio && radeon_encoder->audio->write_latency_fields)
		radeon_encoder->audio->write_latency_fields(encoder, connector, mode);
}

struct r600_audio_pin* radeon_audio_get_pin(struct drm_encoder *encoder)
{
	struct radeon_device *rdev = encoder->dev->dev_private;
	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);

	if (radeon_encoder->audio && radeon_encoder->audio->get_pin)
		return radeon_encoder->audio->get_pin(rdev);

	return NULL;
}

static void radeon_audio_select_pin(struct drm_encoder *encoder)
{
	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);

	if (radeon_encoder->audio && radeon_encoder->audio->select_pin)
		radeon_encoder->audio->select_pin(encoder);
}

void radeon_audio_enable(struct radeon_device *rdev,
	struct r600_audio_pin *pin, u8 enable_mask)
{
	if (rdev->audio.funcs->enable)
		rdev->audio.funcs->enable(rdev, pin, enable_mask);
}

void radeon_audio_detect(struct drm_connector *connector,
			 enum drm_connector_status status)
{
	struct radeon_device *rdev;
	struct radeon_encoder *radeon_encoder;
	struct radeon_encoder_atom_dig *dig;

	if (!connector || !connector->encoder)
		return;

	rdev = connector->encoder->dev->dev_private;

	if (!radeon_audio_chipset_supported(rdev))
		return;

	radeon_encoder = to_radeon_encoder(connector->encoder);
	dig = radeon_encoder->enc_priv;

	if (status == connector_status_connected) {
		struct radeon_connector *radeon_connector;
		int sink_type;

		if (!drm_detect_monitor_audio(radeon_connector_edid(connector))) {
			radeon_encoder->audio = NULL;
			return;
		}

		radeon_connector = to_radeon_connector(connector);
		sink_type = radeon_dp_getsinktype(radeon_connector);

		if (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort &&
			sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT)
			radeon_encoder->audio = rdev->audio.dp_funcs;
		else
			radeon_encoder->audio = rdev->audio.hdmi_funcs;

		dig->afmt->pin = radeon_audio_get_pin(connector->encoder);
		radeon_audio_enable(rdev, dig->afmt->pin, 0xf);
	} else {
		radeon_audio_enable(rdev, dig->afmt->pin, 0);
		dig->afmt->pin = NULL;
	}
}

void radeon_audio_fini(struct radeon_device *rdev)
{
	int i;

	if (!rdev->audio.enabled)
		return;

	for (i = 0; i < rdev->audio.num_pins; i++)
		radeon_audio_enable(rdev, &rdev->audio.pin[i], false);

	rdev->audio.enabled = false;
}

static void radeon_audio_set_dto(struct drm_encoder *encoder, unsigned int clock)
{
	struct radeon_device *rdev = encoder->dev->dev_private;
	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
	struct radeon_crtc *crtc = to_radeon_crtc(encoder->crtc);

	if (radeon_encoder->audio && radeon_encoder->audio->set_dto)
		radeon_encoder->audio->set_dto(rdev, crtc, clock);
}

static int radeon_audio_set_avi_packet(struct drm_encoder *encoder,
	struct drm_display_mode *mode)
{
	struct radeon_device *rdev = encoder->dev->dev_private;
	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
	struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
	struct drm_connector *connector;
	struct radeon_connector *radeon_connector = NULL;
	u8 buffer[HDMI_INFOFRAME_HEADER_SIZE + HDMI_AVI_INFOFRAME_SIZE];
	struct hdmi_avi_infoframe frame;
	int err;

	list_for_each_entry(connector,
		&encoder->dev->mode_config.connector_list, head) {
		if (connector->encoder == encoder) {
			radeon_connector = to_radeon_connector(connector);
			break;
		}
	}

	if (!radeon_connector) {
		DRM_ERROR("Couldn't find encoder's connector\n");
		return -ENOENT;
	}

	err = drm_hdmi_avi_infoframe_from_display_mode(&frame, mode);
	if (err < 0) {
		DRM_ERROR("failed to setup AVI infoframe: %d\n", err);
		return err;
	}

	if (drm_rgb_quant_range_selectable(radeon_connector_edid(connector))) {
		if (radeon_encoder->output_csc == RADEON_OUTPUT_CSC_TVRGB)
			frame.quantization_range = HDMI_QUANTIZATION_RANGE_LIMITED;
		else
			frame.quantization_range = HDMI_QUANTIZATION_RANGE_FULL;
	} else {
		frame.quantization_range = HDMI_QUANTIZATION_RANGE_DEFAULT;
	}

	err = hdmi_avi_infoframe_pack(&frame, buffer, sizeof(buffer));
	if (err < 0) {
		DRM_ERROR("failed to pack AVI infoframe: %d\n", err);
		return err;
	}

	if (dig && dig->afmt &&
		radeon_encoder->audio && radeon_encoder->audio->set_avi_packet)
		radeon_encoder->audio->set_avi_packet(rdev, dig->afmt->offset,
			buffer, sizeof(buffer));

	return 0;
}

/*
 * calculate CTS and N values if they are not found in the table
 */
static void radeon_audio_calc_cts(unsigned int clock, int *CTS, int *N, int freq)
{
	int n, cts;
	unsigned long div, mul;

	/* Safe, but overly large values */
	n = 128 * freq;
	cts = clock * 1000;

	/* Smallest valid fraction */
	div = gcd(n, cts);

	n /= div;
	cts /= div;

	/*
	 * The optimal N is 128*freq/1000. Calculate the closest larger
	 * value that doesn't truncate any bits.
	 */
	mul = ((128*freq/1000) + (n-1))/n;

	n *= mul;
	cts *= mul;

	/* Check that we are in spec (not always possible) */
	if (n < (128*freq/1500))
		printk(KERN_WARNING "Calculated ACR N value is too small. You may experience audio problems.\n");
	if (n > (128*freq/300))
		printk(KERN_WARNING "Calculated ACR N value is too large. You may experience audio problems.\n");

	*N = n;
	*CTS = cts;

	DRM_DEBUG("Calculated ACR timing N=%d CTS=%d for frequency %d\n",
		*N, *CTS, freq);
}

static const struct radeon_hdmi_acr* radeon_audio_acr(unsigned int clock)
{
	static struct radeon_hdmi_acr res;
	u8 i;

	static const struct radeon_hdmi_acr hdmi_predefined_acr[] = {
		/*       32kHz    44.1kHz   48kHz    */
		/* Clock      N     CTS      N     CTS      N     CTS */
		{  25175,  4096,  25175, 28224, 125875,  6144,  25175 }, /*  25,20/1.001 MHz */
		{  25200,  4096,  25200,  6272,  28000,  6144,  25200 }, /*  25.20       MHz */
		{  27000,  4096,  27000,  6272,  30000,  6144,  27000 }, /*  27.00       MHz */
		{  27027,  4096,  27027,  6272,  30030,  6144,  27027 }, /*  27.00*1.001 MHz */
		{  54000,  4096,  54000,  6272,  60000,  6144,  54000 }, /*  54.00       MHz */
		{  54054,  4096,  54054,  6272,  60060,  6144,  54054 }, /*  54.00*1.001 MHz */
		{  74176,  4096,  74176,  5733,  75335,  6144,  74176 }, /*  74.25/1.001 MHz */
		{  74250,  4096,  74250,  6272,  82500,  6144,  74250 }, /*  74.25       MHz */
		{ 148352,  4096, 148352,  5733, 150670,  6144, 148352 }, /* 148.50/1.001 MHz */
		{ 148500,  4096, 148500,  6272, 165000,  6144, 148500 }, /* 148.50       MHz */
	};

	/* Precalculated values for common clocks */
	for (i = 0; i < ARRAY_SIZE(hdmi_predefined_acr); i++)
		if (hdmi_predefined_acr[i].clock == clock)
			return &hdmi_predefined_acr[i];

	/* And odd clocks get manually calculated */
	radeon_audio_calc_cts(clock, &res.cts_32khz, &res.n_32khz, 32000);
	radeon_audio_calc_cts(clock, &res.cts_44_1khz, &res.n_44_1khz, 44100);
	radeon_audio_calc_cts(clock, &res.cts_48khz, &res.n_48khz, 48000);

	return &res;
}

/*
 * update the N and CTS parameters for a given pixel clock rate
 */
static void radeon_audio_update_acr(struct drm_encoder *encoder, unsigned int clock)
{
	const struct radeon_hdmi_acr *acr = radeon_audio_acr(clock);
	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
	struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;

	if (!dig || !dig->afmt)
		return;

	if (radeon_encoder->audio && radeon_encoder->audio->update_acr)
		radeon_encoder->audio->update_acr(encoder, dig->afmt->offset, acr);
}

static void radeon_audio_set_vbi_packet(struct drm_encoder *encoder)
{
	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
	struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;

	if (!dig || !dig->afmt)
		return;

	if (radeon_encoder->audio && radeon_encoder->audio->set_vbi_packet)
		radeon_encoder->audio->set_vbi_packet(encoder, dig->afmt->offset);
}

static void radeon_hdmi_set_color_depth(struct drm_encoder *encoder)
{
	int bpc = 8;
	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
	struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;

	if (!dig || !dig->afmt)
		return;

	if (encoder->crtc) {
		struct radeon_crtc *radeon_crtc = to_radeon_crtc(encoder->crtc);
		bpc = radeon_crtc->bpc;
	}

	if (radeon_encoder->audio && radeon_encoder->audio->set_color_depth)
		radeon_encoder->audio->set_color_depth(encoder, dig->afmt->offset, bpc);
}

static void radeon_audio_set_audio_packet(struct drm_encoder *encoder)
{
	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
	struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;

	if (!dig || !dig->afmt)
		return;

	if (radeon_encoder->audio && radeon_encoder->audio->set_audio_packet)
		radeon_encoder->audio->set_audio_packet(encoder, dig->afmt->offset);
}

static void radeon_audio_set_mute(struct drm_encoder *encoder, bool mute)
{
	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
	struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;

	if (!dig || !dig->afmt)
		return;

	if (radeon_encoder->audio && radeon_encoder->audio->set_mute)
		radeon_encoder->audio->set_mute(encoder, dig->afmt->offset, mute);
}

/*
 * update the info frames with the data from the current display mode
 */
static void radeon_audio_hdmi_mode_set(struct drm_encoder *encoder,
				       struct drm_display_mode *mode)
{
	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
	struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;

	if (!dig || !dig->afmt)
		return;

	radeon_audio_set_mute(encoder, true);

	radeon_audio_write_speaker_allocation(encoder);
	radeon_audio_write_sad_regs(encoder);
	radeon_audio_write_latency_fields(encoder, mode);
	radeon_audio_set_dto(encoder, mode->clock);
	radeon_audio_set_vbi_packet(encoder);
	radeon_hdmi_set_color_depth(encoder);
	radeon_audio_update_acr(encoder, mode->clock);
	radeon_audio_set_audio_packet(encoder);
	radeon_audio_select_pin(encoder);

	if (radeon_audio_set_avi_packet(encoder, mode) < 0)
		return;

	radeon_audio_set_mute(encoder, false);
}

static void radeon_audio_dp_mode_set(struct drm_encoder *encoder,
	struct drm_display_mode *mode)
{
	struct drm_device *dev = encoder->dev;
	struct radeon_device *rdev = dev->dev_private;
	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
	struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
	struct drm_connector *connector = radeon_get_connector_for_encoder(encoder);
	struct radeon_connector *radeon_connector = to_radeon_connector(connector);
	struct radeon_connector_atom_dig *dig_connector =
		radeon_connector->con_priv;

	if (!dig || !dig->afmt)
		return;

	radeon_audio_write_speaker_allocation(encoder);
	radeon_audio_write_sad_regs(encoder);
	radeon_audio_write_latency_fields(encoder, mode);
	if (rdev->clock.dp_extclk || ASIC_IS_DCE5(rdev))
		radeon_audio_set_dto(encoder, rdev->clock.default_dispclk * 10);
	else
		radeon_audio_set_dto(encoder, dig_connector->dp_clock);
	radeon_audio_set_audio_packet(encoder);
	radeon_audio_select_pin(encoder);

	if (radeon_audio_set_avi_packet(encoder, mode) < 0)
		return;
}

void radeon_audio_mode_set(struct drm_encoder *encoder,
	struct drm_display_mode *mode)
{
	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);

	if (radeon_encoder->audio && radeon_encoder->audio->mode_set)
		radeon_encoder->audio->mode_set(encoder, mode);
}

void radeon_audio_dpms(struct drm_encoder *encoder, int mode)
{
	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);

	if (radeon_encoder->audio && radeon_encoder->audio->dpms)
		radeon_encoder->audio->dpms(encoder, mode == DRM_MODE_DPMS_ON);
}