drivers/gpu/drm/radeon/dce3_1_afmt.c - linux - Git at Google

 /*
  * Copyright 2013 Advanced Micro Devices, Inc.
  * Copyright 2014 Rafał Miłecki
  *
  * 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.
  */
 #include <linux/hdmi.h>

 #include "radeon.h"
 #include "radeon_asic.h"
 #include "radeon_audio.h"
 #include "r600d.h"

 void dce3_2_afmt_hdmi_write_speaker_allocation(struct drm_encoder *encoder,
 	u8 *sadb, int sad_count)
 {
 	struct radeon_device *rdev = encoder->dev->dev_private;
 	u32 tmp;

 	/* program the speaker allocation */
 	tmp = RREG32_ENDPOINT(0, AZ_F0_CODEC_PIN0_CONTROL_CHANNEL_SPEAKER);
 	tmp &= ~(DP_CONNECTION | SPEAKER_ALLOCATION_MASK);
 	/* set HDMI mode */
 	tmp |= HDMI_CONNECTION;
 	if (sad_count)
 		tmp |= SPEAKER_ALLOCATION(sadb[0]);
 	else
 		tmp |= SPEAKER_ALLOCATION(5); /* stereo */
 	WREG32_ENDPOINT(0, AZ_F0_CODEC_PIN0_CONTROL_CHANNEL_SPEAKER, tmp);
 }

 void dce3_2_afmt_dp_write_speaker_allocation(struct drm_encoder *encoder,
 	u8 *sadb, int sad_count)
 {
 	struct radeon_device *rdev = encoder->dev->dev_private;
 	u32 tmp;

 	/* program the speaker allocation */
 	tmp = RREG32_ENDPOINT(0, AZ_F0_CODEC_PIN0_CONTROL_CHANNEL_SPEAKER);
 	tmp &= ~(HDMI_CONNECTION | SPEAKER_ALLOCATION_MASK);
 	/* set DP mode */
 	tmp |= DP_CONNECTION;
 	if (sad_count)
 		tmp |= SPEAKER_ALLOCATION(sadb[0]);
 	else
 		tmp |= SPEAKER_ALLOCATION(5); /* stereo */
 	WREG32_ENDPOINT(0, AZ_F0_CODEC_PIN0_CONTROL_CHANNEL_SPEAKER, tmp);
 }

 void dce3_2_afmt_write_sad_regs(struct drm_encoder *encoder,
 	struct cea_sad *sads, int sad_count)
 {
 	int i;
 	struct radeon_device *rdev = encoder->dev->dev_private;
 	static const u16 eld_reg_to_type[][2] = {
 		{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR0, HDMI_AUDIO_CODING_TYPE_PCM },
 		{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR1, HDMI_AUDIO_CODING_TYPE_AC3 },
 		{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR2, HDMI_AUDIO_CODING_TYPE_MPEG1 },
 		{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR3, HDMI_AUDIO_CODING_TYPE_MP3 },
 		{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR4, HDMI_AUDIO_CODING_TYPE_MPEG2 },
 		{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR5, HDMI_AUDIO_CODING_TYPE_AAC_LC },
 		{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR6, HDMI_AUDIO_CODING_TYPE_DTS },
 		{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR7, HDMI_AUDIO_CODING_TYPE_ATRAC },
 		{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR9, HDMI_AUDIO_CODING_TYPE_EAC3 },
 		{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR10, HDMI_AUDIO_CODING_TYPE_DTS_HD },
 		{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR11, HDMI_AUDIO_CODING_TYPE_MLP },
 		{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR13, HDMI_AUDIO_CODING_TYPE_WMA_PRO },
 	};

 	for (i = 0; i < ARRAY_SIZE(eld_reg_to_type); i++) {
 		u32 value = 0;
 		u8 stereo_freqs = 0;
 		int max_channels = -1;
 		int j;

 		for (j = 0; j < sad_count; j++) {
 			struct cea_sad *sad = &sads[j];

 			if (sad->format == eld_reg_to_type[i][1]) {
 				if (sad->channels > max_channels) {
 					value = MAX_CHANNELS(sad->channels) |
 						DESCRIPTOR_BYTE_2(sad->byte2) |
 						SUPPORTED_FREQUENCIES(sad->freq);
 					max_channels = sad->channels;
 				}

 				if (sad->format == HDMI_AUDIO_CODING_TYPE_PCM)
 					stereo_freqs |= sad->freq;
 				else
 					break;
 			}
 		}

 		value |= SUPPORTED_FREQUENCIES_STEREO(stereo_freqs);

 		WREG32_ENDPOINT(0, eld_reg_to_type[i][0], value);
 	}
 }

 void dce3_2_audio_set_dto(struct radeon_device *rdev,
 	struct radeon_crtc *crtc, unsigned int clock)
 {
 	struct radeon_encoder *radeon_encoder;
 	struct radeon_encoder_atom_dig *dig;
 	unsigned int max_ratio = clock / 24000;
 	u32 dto_phase;
 	u32 wallclock_ratio;
 	u32 dto_cntl;

 	if (!crtc)
 		return;

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

 	if (!dig)
 		return;

 	if (max_ratio >= 8) {
 		dto_phase = 192 * 1000;
 		wallclock_ratio = 3;
 	} else if (max_ratio >= 4) {
 		dto_phase = 96 * 1000;
 		wallclock_ratio = 2;
 	} else if (max_ratio >= 2) {
 		dto_phase = 48 * 1000;
 		wallclock_ratio = 1;
 	} else {
 		dto_phase = 24 * 1000;
 		wallclock_ratio = 0;
 	}

 	/* Express [24MHz / target pixel clock] as an exact rational
 	 * number (coefficient of two integer numbers.  DCCG_AUDIO_DTOx_PHASE
 	 * is the numerator, DCCG_AUDIO_DTOx_MODULE is the denominator
 	 */
 	if (dig->dig_encoder == 0) {
 		dto_cntl = RREG32(DCCG_AUDIO_DTO0_CNTL) & ~DCCG_AUDIO_DTO_WALLCLOCK_RATIO_MASK;
 		dto_cntl |= DCCG_AUDIO_DTO_WALLCLOCK_RATIO(wallclock_ratio);
 		WREG32(DCCG_AUDIO_DTO0_CNTL, dto_cntl);
 		WREG32(DCCG_AUDIO_DTO0_PHASE, dto_phase);
 		WREG32(DCCG_AUDIO_DTO0_MODULE, clock);
 		WREG32(DCCG_AUDIO_DTO_SELECT, 0); /* select DTO0 */
 	} else {
 		dto_cntl = RREG32(DCCG_AUDIO_DTO1_CNTL) & ~DCCG_AUDIO_DTO_WALLCLOCK_RATIO_MASK;
 		dto_cntl |= DCCG_AUDIO_DTO_WALLCLOCK_RATIO(wallclock_ratio);
 		WREG32(DCCG_AUDIO_DTO1_CNTL, dto_cntl);
 		WREG32(DCCG_AUDIO_DTO1_PHASE, dto_phase);
 		WREG32(DCCG_AUDIO_DTO1_MODULE, clock);
 		WREG32(DCCG_AUDIO_DTO_SELECT, 1); /* select DTO1 */
 	}
 }

 void dce3_2_hdmi_update_acr(struct drm_encoder *encoder, long offset,
 	const struct radeon_hdmi_acr *acr)
 {
 	struct drm_device *dev = encoder->dev;
 	struct radeon_device *rdev = dev->dev_private;

 	WREG32(DCE3_HDMI0_ACR_PACKET_CONTROL + offset,
 		HDMI0_ACR_SOURCE |		/* select SW CTS value */
 		HDMI0_ACR_AUTO_SEND);	/* allow hw to sent ACR packets when required */

 	WREG32_P(HDMI0_ACR_32_0 + offset,
 		HDMI0_ACR_CTS_32(acr->cts_32khz),
 		~HDMI0_ACR_CTS_32_MASK);
 	WREG32_P(HDMI0_ACR_32_1 + offset,
 		HDMI0_ACR_N_32(acr->n_32khz),
 		~HDMI0_ACR_N_32_MASK);

 	WREG32_P(HDMI0_ACR_44_0 + offset,
 		HDMI0_ACR_CTS_44(acr->cts_44_1khz),
 		~HDMI0_ACR_CTS_44_MASK);
 	WREG32_P(HDMI0_ACR_44_1 + offset,
 		HDMI0_ACR_N_44(acr->n_44_1khz),
 		~HDMI0_ACR_N_44_MASK);

 	WREG32_P(HDMI0_ACR_48_0 + offset,
 		HDMI0_ACR_CTS_48(acr->cts_48khz),
 		~HDMI0_ACR_CTS_48_MASK);
 	WREG32_P(HDMI0_ACR_48_1 + offset,
 		HDMI0_ACR_N_48(acr->n_48khz),
 		~HDMI0_ACR_N_48_MASK);
 }

 void dce3_2_set_audio_packet(struct drm_encoder *encoder, u32 offset)
 {
 	struct drm_device *dev = encoder->dev;
 	struct radeon_device *rdev = dev->dev_private;

 	WREG32(HDMI0_AUDIO_PACKET_CONTROL + offset,
 		HDMI0_AUDIO_DELAY_EN(1) |			/* default audio delay */
 		HDMI0_AUDIO_PACKETS_PER_LINE(3));	/* should be suffient for all audio modes and small enough for all hblanks */

 	WREG32(AFMT_AUDIO_PACKET_CONTROL + offset,
 		AFMT_AUDIO_SAMPLE_SEND |			/* send audio packets */
 		AFMT_60958_CS_UPDATE);				/* allow 60958 channel status fields to be updated */

 	WREG32_OR(HDMI0_INFOFRAME_CONTROL0 + offset,
 		HDMI0_AUDIO_INFO_SEND |				/* enable audio info frames (frames won't be set until audio is enabled) */
 		HDMI0_AUDIO_INFO_CONT);				/* send audio info frames every frame/field */

 	WREG32_OR(HDMI0_INFOFRAME_CONTROL1 + offset,
 		HDMI0_AUDIO_INFO_LINE(2));			/* anything other than 0 */
 }

 void dce3_2_set_mute(struct drm_encoder *encoder, u32 offset, bool mute)
 {
 	struct drm_device *dev = encoder->dev;
 	struct radeon_device *rdev = dev->dev_private;

 	if (mute)
 		WREG32_OR(HDMI0_GC + offset, HDMI0_GC_AVMUTE);
 	else
 		WREG32_AND(HDMI0_GC + offset, ~HDMI0_GC_AVMUTE);
 }
	/*
	* Copyright 2013 Advanced Micro Devices, Inc.
	* Copyright 2014 Rafał Miłecki
	*
	* 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.
	*/
	#include <linux/hdmi.h>

	#include "radeon.h"
	#include "radeon_asic.h"
	#include "radeon_audio.h"
	#include "r600d.h"

	void dce3_2_afmt_hdmi_write_speaker_allocation(struct drm_encoder *encoder,
	u8 *sadb, int sad_count)
	{
	struct radeon_device *rdev = encoder->dev->dev_private;
	u32 tmp;

	/* program the speaker allocation */
	tmp = RREG32_ENDPOINT(0, AZ_F0_CODEC_PIN0_CONTROL_CHANNEL_SPEAKER);
	tmp &= ~(DP_CONNECTION \| SPEAKER_ALLOCATION_MASK);
	/* set HDMI mode */
	tmp \|= HDMI_CONNECTION;
	if (sad_count)
	tmp \|= SPEAKER_ALLOCATION(sadb[0]);
	else
	tmp \|= SPEAKER_ALLOCATION(5); /* stereo */
	WREG32_ENDPOINT(0, AZ_F0_CODEC_PIN0_CONTROL_CHANNEL_SPEAKER, tmp);
	}

	void dce3_2_afmt_dp_write_speaker_allocation(struct drm_encoder *encoder,
	u8 *sadb, int sad_count)
	{
	struct radeon_device *rdev = encoder->dev->dev_private;
	u32 tmp;

	/* program the speaker allocation */
	tmp = RREG32_ENDPOINT(0, AZ_F0_CODEC_PIN0_CONTROL_CHANNEL_SPEAKER);
	tmp &= ~(HDMI_CONNECTION \| SPEAKER_ALLOCATION_MASK);
	/* set DP mode */
	tmp \|= DP_CONNECTION;
	if (sad_count)
	tmp \|= SPEAKER_ALLOCATION(sadb[0]);
	else
	tmp \|= SPEAKER_ALLOCATION(5); /* stereo */
	WREG32_ENDPOINT(0, AZ_F0_CODEC_PIN0_CONTROL_CHANNEL_SPEAKER, tmp);
	}

	void dce3_2_afmt_write_sad_regs(struct drm_encoder *encoder,
	struct cea_sad *sads, int sad_count)
	{
	int i;
	struct radeon_device *rdev = encoder->dev->dev_private;
	static const u16 eld_reg_to_type[][2] = {
	{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR0, HDMI_AUDIO_CODING_TYPE_PCM },
	{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR1, HDMI_AUDIO_CODING_TYPE_AC3 },
	{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR2, HDMI_AUDIO_CODING_TYPE_MPEG1 },
	{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR3, HDMI_AUDIO_CODING_TYPE_MP3 },
	{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR4, HDMI_AUDIO_CODING_TYPE_MPEG2 },
	{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR5, HDMI_AUDIO_CODING_TYPE_AAC_LC },
	{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR6, HDMI_AUDIO_CODING_TYPE_DTS },
	{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR7, HDMI_AUDIO_CODING_TYPE_ATRAC },
	{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR9, HDMI_AUDIO_CODING_TYPE_EAC3 },
	{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR10, HDMI_AUDIO_CODING_TYPE_DTS_HD },
	{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR11, HDMI_AUDIO_CODING_TYPE_MLP },
	{ AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR13, HDMI_AUDIO_CODING_TYPE_WMA_PRO },
	};

	for (i = 0; i < ARRAY_SIZE(eld_reg_to_type); i++) {
	u32 value = 0;
	u8 stereo_freqs = 0;
	int max_channels = -1;
	int j;

	for (j = 0; j < sad_count; j++) {
	struct cea_sad *sad = &sads[j];

	if (sad->format == eld_reg_to_type[i][1]) {
	if (sad->channels > max_channels) {
	value = MAX_CHANNELS(sad->channels) \|
	DESCRIPTOR_BYTE_2(sad->byte2) \|
	SUPPORTED_FREQUENCIES(sad->freq);
	max_channels = sad->channels;
	}

	if (sad->format == HDMI_AUDIO_CODING_TYPE_PCM)
	stereo_freqs \|= sad->freq;
	else
	break;
	}
	}

	value \|= SUPPORTED_FREQUENCIES_STEREO(stereo_freqs);

	WREG32_ENDPOINT(0, eld_reg_to_type[i][0], value);
	}
	}

	void dce3_2_audio_set_dto(struct radeon_device *rdev,
	struct radeon_crtc *crtc, unsigned int clock)
	{
	struct radeon_encoder *radeon_encoder;
	struct radeon_encoder_atom_dig *dig;
	unsigned int max_ratio = clock / 24000;
	u32 dto_phase;
	u32 wallclock_ratio;
	u32 dto_cntl;

	if (!crtc)
	return;

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

	if (!dig)
	return;

	if (max_ratio >= 8) {
	dto_phase = 192 * 1000;
	wallclock_ratio = 3;
	} else if (max_ratio >= 4) {
	dto_phase = 96 * 1000;
	wallclock_ratio = 2;
	} else if (max_ratio >= 2) {
	dto_phase = 48 * 1000;
	wallclock_ratio = 1;
	} else {
	dto_phase = 24 * 1000;
	wallclock_ratio = 0;
	}

	/* Express [24MHz / target pixel clock] as an exact rational
	* number (coefficient of two integer numbers. DCCG_AUDIO_DTOx_PHASE
	* is the numerator, DCCG_AUDIO_DTOx_MODULE is the denominator
	*/
	if (dig->dig_encoder == 0) {
	dto_cntl = RREG32(DCCG_AUDIO_DTO0_CNTL) & ~DCCG_AUDIO_DTO_WALLCLOCK_RATIO_MASK;
	dto_cntl \|= DCCG_AUDIO_DTO_WALLCLOCK_RATIO(wallclock_ratio);
	WREG32(DCCG_AUDIO_DTO0_CNTL, dto_cntl);
	WREG32(DCCG_AUDIO_DTO0_PHASE, dto_phase);
	WREG32(DCCG_AUDIO_DTO0_MODULE, clock);
	WREG32(DCCG_AUDIO_DTO_SELECT, 0); /* select DTO0 */
	} else {
	dto_cntl = RREG32(DCCG_AUDIO_DTO1_CNTL) & ~DCCG_AUDIO_DTO_WALLCLOCK_RATIO_MASK;
	dto_cntl \|= DCCG_AUDIO_DTO_WALLCLOCK_RATIO(wallclock_ratio);
	WREG32(DCCG_AUDIO_DTO1_CNTL, dto_cntl);
	WREG32(DCCG_AUDIO_DTO1_PHASE, dto_phase);
	WREG32(DCCG_AUDIO_DTO1_MODULE, clock);
	WREG32(DCCG_AUDIO_DTO_SELECT, 1); /* select DTO1 */
	}
	}

	void dce3_2_hdmi_update_acr(struct drm_encoder *encoder, long offset,
	const struct radeon_hdmi_acr *acr)
	{
	struct drm_device *dev = encoder->dev;
	struct radeon_device *rdev = dev->dev_private;

	WREG32(DCE3_HDMI0_ACR_PACKET_CONTROL + offset,
	HDMI0_ACR_SOURCE \| /* select SW CTS value */
	HDMI0_ACR_AUTO_SEND); /* allow hw to sent ACR packets when required */

	WREG32_P(HDMI0_ACR_32_0 + offset,
	HDMI0_ACR_CTS_32(acr->cts_32khz),
	~HDMI0_ACR_CTS_32_MASK);
	WREG32_P(HDMI0_ACR_32_1 + offset,
	HDMI0_ACR_N_32(acr->n_32khz),
	~HDMI0_ACR_N_32_MASK);

	WREG32_P(HDMI0_ACR_44_0 + offset,
	HDMI0_ACR_CTS_44(acr->cts_44_1khz),
	~HDMI0_ACR_CTS_44_MASK);
	WREG32_P(HDMI0_ACR_44_1 + offset,
	HDMI0_ACR_N_44(acr->n_44_1khz),
	~HDMI0_ACR_N_44_MASK);

	WREG32_P(HDMI0_ACR_48_0 + offset,
	HDMI0_ACR_CTS_48(acr->cts_48khz),
	~HDMI0_ACR_CTS_48_MASK);
	WREG32_P(HDMI0_ACR_48_1 + offset,
	HDMI0_ACR_N_48(acr->n_48khz),
	~HDMI0_ACR_N_48_MASK);
	}

	void dce3_2_set_audio_packet(struct drm_encoder *encoder, u32 offset)
	{
	struct drm_device *dev = encoder->dev;
	struct radeon_device *rdev = dev->dev_private;

	WREG32(HDMI0_AUDIO_PACKET_CONTROL + offset,
	HDMI0_AUDIO_DELAY_EN(1) \| /* default audio delay */
	HDMI0_AUDIO_PACKETS_PER_LINE(3)); /* should be suffient for all audio modes and small enough for all hblanks */

	WREG32(AFMT_AUDIO_PACKET_CONTROL + offset,
	AFMT_AUDIO_SAMPLE_SEND \| /* send audio packets */
	AFMT_60958_CS_UPDATE); /* allow 60958 channel status fields to be updated */

	WREG32_OR(HDMI0_INFOFRAME_CONTROL0 + offset,
	HDMI0_AUDIO_INFO_SEND \| /* enable audio info frames (frames won't be set until audio is enabled) */
	HDMI0_AUDIO_INFO_CONT); /* send audio info frames every frame/field */

	WREG32_OR(HDMI0_INFOFRAME_CONTROL1 + offset,
	HDMI0_AUDIO_INFO_LINE(2)); /* anything other than 0 */
	}

	void dce3_2_set_mute(struct drm_encoder *encoder, u32 offset, bool mute)
	{
	struct drm_device *dev = encoder->dev;
	struct radeon_device *rdev = dev->dev_private;

	if (mute)
	WREG32_OR(HDMI0_GC + offset, HDMI0_GC_AVMUTE);
	else
	WREG32_AND(HDMI0_GC + offset, ~HDMI0_GC_AVMUTE);
	}