[PATCH v15 10/11] drm/mediatek: DP audio support for MT8195

From: Bo-Chen Chen
Date: Wed Jul 27 2022 - 00:51:47 EST

From: Guillaume Ranquet <granquet@xxxxxxxxxxxx>

This patch adds audio support to the DP driver for MT8195 with up to 8
channels.

Signed-off-by: Guillaume Ranquet <granquet@xxxxxxxxxxxx>
Signed-off-by: Bo-Chen Chen <rex-bc.chen@xxxxxxxxxxxx>
---
drivers/gpu/drm/mediatek/mtk_dp.c | 725 ++++++++++++++++++++++++++
drivers/gpu/drm/mediatek/mtk_dp_reg.h | 2 +
2 files changed, 727 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
index 637fd535704a..4fc61e0a1963 100644
--- a/drivers/gpu/drm/mediatek/mtk_dp.c
+++ b/drivers/gpu/drm/mediatek/mtk_dp.c
@@ -43,6 +43,7 @@
#define MTK_DP_TBC_BUF_READ_START_ADDR 0x08
#define MTK_DP_TRAIN_DOWNSCALE_RETRY 8
#define MTK_DP_TRAIN_CLEAR_RETRY 50
+#define MTK_DP_VERSION 0x11

struct mtk_dp_train_info {
bool tps3;
@@ -57,9 +58,43 @@ struct mtk_dp_train_info {
bool hpd_inerrupt;
};

+enum mtk_dp_sdp_type {
+ MTK_DP_SDP_NONE = 0x00,
+ MTK_DP_SDP_ACM = 0x01,
+ MTK_DP_SDP_ISRC = 0x02,
+ MTK_DP_SDP_AVI = 0x03,
+ MTK_DP_SDP_AUI = 0x04,
+ MTK_DP_SDP_SPD = 0x05,
+ MTK_DP_SDP_MPEG = 0x06,
+ MTK_DP_SDP_NTSC = 0x07,
+ MTK_DP_SDP_VSP = 0x08,
+ MTK_DP_SDP_VSC = 0x09,
+ MTK_DP_SDP_EXT = 0x0A,
+ MTK_DP_SDP_PPS0 = 0x0B,
+ MTK_DP_SDP_PPS1 = 0x0C,
+ MTK_DP_SDP_PPS2 = 0x0D,
+ MTK_DP_SDP_PPS3 = 0x0E,
+ MTK_DP_SDP_DRM = 0x10,
+ MTK_DP_SDP_MAX_NUM
+};
+
+struct mtk_dp_sdp_packet {
+ enum mtk_dp_sdp_type type;
+ struct dp_sdp sdp;
+};
+
+struct mtk_dp_audio_cfg {
+ int sample_rate;
+ int word_length_bits;
+ int channels;
+};
+
struct mtk_dp_info {
enum dp_pixelformat format;
struct videomode vm;
+ u8 frame_rate;
+ u32 pix_rate_khz;
+ struct mtk_dp_audio_cfg audio_caps;
};

struct dp_cal_data {
@@ -73,6 +108,7 @@ struct dp_cal_data {
struct mtk_dp {
struct device *dev;
struct platform_device *phy_dev;
+ struct platform_device *audio_pdev;
struct phy *phy;
struct dp_cal_data cal_data;
u8 max_lanes;
@@ -92,6 +128,19 @@ struct mtk_dp {
struct regmap *regs;

bool enabled;
+ bool audio_enable;
+
+ /* protect the plugged_cb as it's used in both bridge ops and audio */
+ struct mutex update_plugged_status_lock;
+ /* protect the eld data as it's used in both bridge ops and audio */
+ struct mutex eld_lock;
+ /* protect edid as it is used in both bridge ops and IRQ handler */
+ struct mutex edid_lock;
+ struct edid *edid;
+
+ hdmi_codec_plugged_cb plugged_cb;
+ struct device *codec_dev;
+ u8 connector_eld[MAX_ELD_BYTES];

struct drm_connector *conn;
bool need_debounce;
@@ -349,6 +398,125 @@ static void mtk_dp_pg_enable(struct mtk_dp *mtk_dp, bool enable)
4 << PGEN_PATTERN_SEL_SHIFT, PGEN_PATTERN_SEL_MASK);
}

+static void mtk_dp_audio_setup_channels(struct mtk_dp *mtk_dp,
+ struct mtk_dp_audio_cfg *cfg)
+{
+ u32 channel_enable_bits;
+
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3324,
+ AUDIO_SOURCE_MUX_DP_ENC1_P0_DPRX,
+ AUDIO_SOURCE_MUX_DP_ENC1_P0_MASK);
+
+ /* audio channel count change reset */
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_33F4, BIT(9), BIT(9));
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3304,
+ AU_PRTY_REGEN_DP_ENC1_P0_MASK,
+ AU_PRTY_REGEN_DP_ENC1_P0_MASK);
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3304,
+ AU_CH_STS_REGEN_DP_ENC1_P0_MASK,
+ AU_CH_STS_REGEN_DP_ENC1_P0_MASK);
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3304,
+ AUDIO_SAMPLE_PRSENT_REGEN_DP_ENC1_P0_MASK,
+ AUDIO_SAMPLE_PRSENT_REGEN_DP_ENC1_P0_MASK);
+
+ switch (cfg->channels) {
+ case 2:
+ channel_enable_bits = AUDIO_2CH_SEL_DP_ENC0_P0_MASK |
+ AUDIO_2CH_EN_DP_ENC0_P0_MASK;
+ break;
+ case 8:
+ default:
+ channel_enable_bits = AUDIO_8CH_SEL_DP_ENC0_P0_MASK |
+ AUDIO_8CH_EN_DP_ENC0_P0_MASK;
+ break;
+ }
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3088,
+ channel_enable_bits | AU_EN_DP_ENC0_P0_MASK,
+ AUDIO_2CH_SEL_DP_ENC0_P0_MASK |
+ AUDIO_2CH_EN_DP_ENC0_P0_MASK |
+ AUDIO_8CH_SEL_DP_ENC0_P0_MASK |
+ AUDIO_8CH_EN_DP_ENC0_P0_MASK |
+ AU_EN_DP_ENC0_P0_MASK);
+
+ /* audio channel count change reset */
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_33F4, 0, BIT(9));
+
+ /* enable audio reset */
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_33F4, BIT(0), BIT(0));
+}
+
+static void mtk_dp_audio_channel_status_set(struct mtk_dp *mtk_dp,
+ struct mtk_dp_audio_cfg *cfg)
+{
+ struct snd_aes_iec958 iec = { 0 };
+
+ switch (cfg->sample_rate) {
+ case 32000:
+ iec.status[3] = IEC958_AES3_CON_FS_32000;
+ break;
+ case 44100:
+ iec.status[3] = IEC958_AES3_CON_FS_44100;
+ break;
+ case 48000:
+ iec.status[3] = IEC958_AES3_CON_FS_48000;
+ break;
+ case 88200:
+ iec.status[3] = IEC958_AES3_CON_FS_88200;
+ break;
+ case 96000:
+ iec.status[3] = IEC958_AES3_CON_FS_96000;
+ break;
+ case 192000:
+ iec.status[3] = IEC958_AES3_CON_FS_192000;
+ break;
+ default:
+ iec.status[3] = IEC958_AES3_CON_FS_NOTID;
+ break;
+ }
+
+ switch (cfg->word_length_bits) {
+ case 16:
+ iec.status[4] = IEC958_AES4_CON_WORDLEN_20_16;
+ break;
+ case 20:
+ iec.status[4] = IEC958_AES4_CON_WORDLEN_20_16 |
+ IEC958_AES4_CON_MAX_WORDLEN_24;
+ break;
+ case 24:
+ iec.status[4] = IEC958_AES4_CON_WORDLEN_24_20 |
+ IEC958_AES4_CON_MAX_WORDLEN_24;
+ break;
+ default:
+ iec.status[4] = IEC958_AES4_CON_WORDLEN_NOTID;
+ }
+
+ /* IEC 60958 consumer channel status bits */
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_308C,
+ 0, CH_STATUS_0_DP_ENC0_P0_MASK);
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3090,
+ iec.status[3] << 8, CH_STATUS_1_DP_ENC0_P0_MASK);
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3094,
+ iec.status[4], CH_STATUS_2_DP_ENC0_P0_MASK);
+}
+
+static void mtk_dp_audio_sdp_asp_set_channels(struct mtk_dp *mtk_dp,
+ int channels)
+{
+ if (channels != 2 && channels != 8)
+ channels = 8;
+
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_312C,
+ (channels - 1) << ASP_HB3_DP_ENC0_P0_SHIFT,
+ ASP_HB2_DP_ENC0_P0_MASK | ASP_HB3_DP_ENC0_P0_MASK);
+}
+
+static void mtk_dp_audio_set_divider(struct mtk_dp *mtk_dp)
+{
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_30BC,
+ AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_DIV_2,
+ AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_MASK);
+}
+
static bool mtk_dp_plug_state(struct mtk_dp *mtk_dp)
{
return mtk_dp->train_info.cable_plugged_in;
@@ -362,6 +530,169 @@ static bool mtk_dp_plug_state_avoid_pulse(struct mtk_dp *mtk_dp)
4000, 7 * 4000));
}

+static void mtk_dp_sdp_trigger_packet(struct mtk_dp *mtk_dp,
+ enum mtk_dp_sdp_type type)
+{
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3280,
+ type, SDP_PACKET_TYPE_DP_ENC1_P0_MASK);
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3280,
+ SDP_PACKET_W_DP_ENC1_P0, SDP_PACKET_W_DP_ENC1_P0);
+}
+
+static void mtk_dp_sdp_set_data(struct mtk_dp *mtk_dp, u8 *data_bytes)
+{
+ mtk_dp_bulk_16bit_write(mtk_dp, MTK_DP_ENC1_P0_3200,
+ data_bytes, 0x10);
+}
+
+static void mtk_dp_sdp_set_header(struct mtk_dp *mtk_dp,
+ enum mtk_dp_sdp_type type,
+ struct dp_sdp_header *header)
+{
+ u32 db_addr;
+
+ switch (type) {
+ case MTK_DP_SDP_DRM:
+ db_addr = MTK_DP_ENC0_P0_3138;
+ break;
+ case MTK_DP_SDP_PPS0:
+ case MTK_DP_SDP_PPS1:
+ case MTK_DP_SDP_PPS2:
+ case MTK_DP_SDP_PPS3:
+ db_addr = MTK_DP_ENC0_P0_3130;
+ break;
+ default:
+ db_addr = MTK_DP_ENC0_P0_30D8 + (type - MTK_DP_SDP_ACM) * 8;
+ break;
+ }
+
+ mtk_dp_bulk_16bit_write(mtk_dp, db_addr, (u8 *)header, 4);
+}
+
+static const u32 sdp_type_to_reg[MTK_DP_SDP_MAX_NUM] = {
+ [MTK_DP_SDP_NONE] = 0x0,
+ [MTK_DP_SDP_ACM] = MTK_DP_ENC0_P0_30B4,
+ [MTK_DP_SDP_ISRC] = MTK_DP_ENC0_P0_30B4 + 1,
+ [MTK_DP_SDP_AVI] = MTK_DP_ENC0_P0_30A4 + 1,
+ [MTK_DP_SDP_AUI] = MTK_DP_ENC0_P0_30A8,
+ [MTK_DP_SDP_SPD] = MTK_DP_ENC0_P0_30A8 + 1,
+ [MTK_DP_SDP_MPEG] = MTK_DP_ENC0_P0_30AC,
+ [MTK_DP_SDP_NTSC] = MTK_DP_ENC0_P0_30AC + 1,
+ [MTK_DP_SDP_VSP] = MTK_DP_ENC0_P0_30B0,
+ [MTK_DP_SDP_VSC] = MTK_DP_ENC0_P0_30B8,
+ [MTK_DP_SDP_EXT] = MTK_DP_ENC0_P0_30B0 + 1,
+ [MTK_DP_SDP_PPS0] = MTK_DP_ENC0_P0_31E8,
+ [MTK_DP_SDP_PPS1] = MTK_DP_ENC0_P0_31E8,
+ [MTK_DP_SDP_PPS2] = MTK_DP_ENC0_P0_31E8,
+ [MTK_DP_SDP_PPS3] = MTK_DP_ENC0_P0_31E8,
+ [MTK_DP_SDP_DRM] = MTK_DP_ENC0_P0_31DC,
+};
+
+static void mtk_dp_disable_sdp(struct mtk_dp *mtk_dp, enum mtk_dp_sdp_type type)
+{
+ if (type == MTK_DP_SDP_NONE)
+ return;
+
+ /* Disable periodic send */
+ mtk_dp_update_bits(mtk_dp, sdp_type_to_reg[type] & 0xfffc, 0,
+ 0xFF << ((sdp_type_to_reg[type] & 3) * 8));
+}
+
+static void mtk_dp_setup_sdp(struct mtk_dp *mtk_dp,
+ struct mtk_dp_sdp_packet *packet)
+{
+ u32 reg, shift;
+
+ mtk_dp_sdp_set_data(mtk_dp, packet->sdp.db);
+ mtk_dp_sdp_set_header(mtk_dp, packet->type, &packet->sdp.sdp_header);
+
+ mtk_dp_disable_sdp(mtk_dp, packet->type);
+
+ switch (packet->type) {
+ case MTK_DP_SDP_ISRC:
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_31EC,
+ 0x1C << ISRC1_HB3_DP_ENC0_P0_SHIFT,
+ ISRC1_HB3_DP_ENC0_P0_MASK);
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3280,
+ MTK_DP_SDP_ISRC,
+ SDP_PACKET_TYPE_DP_ENC1_P0_MASK);
+
+ if (packet->sdp.sdp_header.HB3 & BIT(2))
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_30BC,
+ BIT(ISRC_CONT_DP_ENC0_P0_SHIFT),
+ ISRC_CONT_DP_ENC0_P0_MASK);
+ else
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_30BC,
+ 0, ISRC_CONT_DP_ENC0_P0_MASK);
+
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3280,
+ SDP_PACKET_W_DP_ENC1_P0,
+ SDP_PACKET_W_DP_ENC1_P0);
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_30B4,
+ 5 << ISRC_CFG_DP_ENC0_P0_SHIFT,
+ ISRC_CFG_DP_ENC0_P0_MASK);
+ break;
+ case MTK_DP_SDP_DRM:
+ mtk_dp_sdp_trigger_packet(mtk_dp, packet->type);
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_31DC,
+ 5 << HDR0_CFG_DP_ENC0_P0_SHIFT,
+ HDR0_CFG_DP_ENC0_P0_MASK);
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_31EC,
+ 0x1C << ISRC1_HB3_DP_ENC0_P0_SHIFT,
+ ISRC1_HB3_DP_ENC0_P0_MASK);
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3280,
+ MTK_DP_SDP_ISRC,
+ SDP_PACKET_TYPE_DP_ENC1_P0_MASK);
+
+ if (packet->sdp.sdp_header.HB3 & BIT(2))
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_30BC,
+ BIT(ISRC_CONT_DP_ENC0_P0_SHIFT),
+ ISRC_CONT_DP_ENC0_P0_MASK);
+ else
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_30BC,
+ 0, ISRC_CONT_DP_ENC0_P0_MASK);
+
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3280,
+ SDP_PACKET_W_DP_ENC1_P0,
+ SDP_PACKET_W_DP_ENC1_P0);
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_30B4,
+ 5 << ISRC_CFG_DP_ENC0_P0_SHIFT,
+ ISRC_CFG_DP_ENC0_P0_MASK);
+ break;
+ case MTK_DP_SDP_ACM:
+ case MTK_DP_SDP_AVI:
+ case MTK_DP_SDP_AUI:
+ case MTK_DP_SDP_SPD:
+ case MTK_DP_SDP_MPEG:
+ case MTK_DP_SDP_NTSC:
+ case MTK_DP_SDP_VSP:
+ case MTK_DP_SDP_VSC:
+ case MTK_DP_SDP_EXT:
+ case MTK_DP_SDP_PPS0:
+ case MTK_DP_SDP_PPS1:
+ case MTK_DP_SDP_PPS2:
+ case MTK_DP_SDP_PPS3:
+ reg = sdp_type_to_reg[packet->type];
+ shift = (reg & 3) * 8;
+
+ mtk_dp_sdp_trigger_packet(mtk_dp, packet->type);
+ /* Enable periodic sending */
+ mtk_dp_update_bits(mtk_dp, reg & 0xfffc,
+ 0x05 << shift, 0xff << shift);
+ break;
+ case MTK_DP_SDP_NONE:
+ default:
+ break;
+ }
+}
+
+static void mtk_dp_sdp_vsc_ext_disable(struct mtk_dp *mtk_dp)
+{
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_30A0,
+ 0, BIT(7) | BIT(8) | BIT(12));
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_328C, 0, BIT(7));
+}
+
static void mtk_dp_aux_irq_clear(struct mtk_dp *mtk_dp)
{
mtk_dp_write(mtk_dp, MTK_DP_AUX_P0_3640,
@@ -985,6 +1316,32 @@ static void mtk_dp_video_mute(struct mtk_dp *mtk_dp, bool enable)
MTK_DP_SIP_ATF_VIDEO_UNMUTE, enable);
}

+static void mtk_dp_audio_mute(struct mtk_dp *mtk_dp, bool mute)
+{
+ u32 val[3];
+
+ if (mute) {
+ val[0] = BIT(VBID_AUDIO_MUTE_SW_DP_ENC0_P0_SHIFT) |
+ BIT(VBID_AUDIO_MUTE_SEL_DP_ENC0_P0_SHIFT);
+ val[1] = 0;
+ val[2] = 0;
+ } else {
+ val[0] = 0;
+ val[1] = BIT(AU_EN_DP_ENC0_P0_SHIFT);
+ /* Send one every two frames */
+ val[2] = 0x0F;
+ }
+
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3030,
+ val[0],
+ VBID_AUDIO_MUTE_FLAG_SW_DP_ENC0_P0_MASK |
+ VBID_AUDIO_MUTE_FLAG_SEL_DP_ENC0_P0_MASK);
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3088,
+ val[1], AU_EN_DP_ENC0_P0_MASK);
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_30A4,
+ val[2], AU_TS_CFG_DP_ENC0_P0_MASK);
+}
+
static void mtk_dp_power_enable(struct mtk_dp *mtk_dp)
{
mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_RESET_AND_PROBE,
@@ -1025,6 +1382,80 @@ static void mtk_dp_initialize_priv_data(struct mtk_dp *mtk_dp)

mtk_dp->info.format = DP_PIXELFORMAT_RGB;
memset(&mtk_dp->info.vm, 0, sizeof(struct videomode));
+ mtk_dp->info.frame_rate = 60;
+ mtk_dp->info.pix_rate_khz = 0;
+ mtk_dp->audio_enable = false;
+}
+
+static void mtk_dp_sdp_set_down_cnt_init(struct mtk_dp *mtk_dp,
+ u32 sram_read_start)
+{
+ u32 sdp_down_cnt_init = 0;
+ struct drm_display_mode mode;
+ struct videomode *vm = &mtk_dp->info.vm;
+
+ drm_display_mode_from_videomode(vm, &mode);
+
+ if (mtk_dp->info.pix_rate_khz > 0)
+ sdp_down_cnt_init = sram_read_start *
+ mtk_dp->train_info.link_rate * 2700 * 8 /
+ (mtk_dp->info.pix_rate_khz * 4);
+
+ switch (mtk_dp->train_info.lane_count) {
+ case 1:
+ sdp_down_cnt_init = max_t(u32, sdp_down_cnt_init, 0x1A);
+ break;
+ case 2:
+ /* case for LowResolution && High Audio Sample Rate */
+ sdp_down_cnt_init = max_t(u32, sdp_down_cnt_init, 0x10);
+ sdp_down_cnt_init += mode.vtotal <= 525 ? 4 : 0;
+ break;
+ case 4:
+ default:
+ sdp_down_cnt_init = max_t(u32, sdp_down_cnt_init, 6);
+ break;
+ }
+
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3040,
+ sdp_down_cnt_init
+ << SDP_DOWN_CNT_INIT_DP_ENC0_P0_SHIFT,
+ SDP_DOWN_CNT_INIT_DP_ENC0_P0_MASK);
+}
+
+static void mtk_dp_sdp_set_down_cnt_init_in_hblank(struct mtk_dp *mtk_dp)
+{
+ int pix_clk_mhz;
+ u32 dc_offset;
+ u32 spd_down_cnt_init = 0;
+ struct drm_display_mode mode;
+ struct videomode *vm = &mtk_dp->info.vm;
+
+ drm_display_mode_from_videomode(vm, &mode);
+
+ pix_clk_mhz = mtk_dp->info.format == DP_PIXELFORMAT_YUV420 ?
+ mtk_dp->info.pix_rate_khz / 2000 :
+ mtk_dp->info.pix_rate_khz / 1000;
+
+ switch (mtk_dp->train_info.lane_count) {
+ case 1:
+ spd_down_cnt_init = 0x20;
+ break;
+ case 2:
+ dc_offset = (mode.vtotal <= 525) ? 0x14 : 0x00;
+ spd_down_cnt_init = 0x18 + dc_offset;
+ break;
+ case 4:
+ default:
+ dc_offset = (mode.vtotal <= 525) ? 0x08 : 0x00;
+ if (pix_clk_mhz > mtk_dp->train_info.link_rate * 27)
+ spd_down_cnt_init = 0x8;
+ else
+ spd_down_cnt_init = 0x10 + dc_offset;
+ break;
+ }
+
+ mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3364, spd_down_cnt_init,
+ SDP_DOWN_CNT_INIT_IN_HBLANK_DP_ENC1_P0_MASK);
}

static void mtk_dp_setup_tu(struct mtk_dp *mtk_dp)
@@ -1036,13 +1467,44 @@ static void mtk_dp_setup_tu(struct mtk_dp *mtk_dp)
MTK_DP_PIX_PER_ADDR);
mtk_dp_set_sram_read_start(mtk_dp, sram_read_start);
mtk_dp_setup_encoder(mtk_dp);
+ mtk_dp_sdp_set_down_cnt_init_in_hblank(mtk_dp);
+ mtk_dp_sdp_set_down_cnt_init(mtk_dp, sram_read_start);
+}
+
+static void mtk_dp_calculate_pixrate(struct mtk_dp *mtk_dp)
+{
+ u32 target_pixel_clk;
+ struct drm_display_mode mode;
+ struct videomode *vm = &mtk_dp->info.vm;
+
+ drm_display_mode_from_videomode(vm, &mode);
+
+ if (mtk_dp->info.frame_rate > 0) {
+ target_pixel_clk = mode.htotal * mode.vtotal *
+ mtk_dp->info.frame_rate;
+ } else if (mtk_dp->info.pix_rate_khz > 0) {
+ target_pixel_clk = mtk_dp->info.pix_rate_khz * 1000;
+ } else {
+ target_pixel_clk = mode.htotal * mode.vtotal * 60;
+ }
+
+ mtk_dp->info.pix_rate_khz = target_pixel_clk / 1000;
}

static void mtk_dp_set_tx_out(struct mtk_dp *mtk_dp)
{
+ mtk_dp_calculate_pixrate(mtk_dp);
mtk_dp_setup_tu(mtk_dp);
}

+static void mtk_dp_edid_free(struct mtk_dp *mtk_dp)
+{
+ mutex_lock(&mtk_dp->edid_lock);
+ kfree(mtk_dp->edid);
+ mtk_dp->edid = NULL;
+ mutex_unlock(&mtk_dp->edid_lock);
+}
+
static void mtk_dp_hpd_sink_event(struct mtk_dp *mtk_dp)
{
ssize_t ret;
@@ -1066,6 +1528,17 @@ static void mtk_dp_hpd_sink_event(struct mtk_dp *mtk_dp)
DP_REMOTE_CONTROL_COMMAND_PENDING);
}

+static void mtk_dp_sdp_stop_sending(struct mtk_dp *mtk_dp)
+{
+ u8 packet_type;
+
+ for (packet_type = MTK_DP_SDP_ACM; packet_type < MTK_DP_SDP_MAX_NUM;
+ packet_type++)
+ mtk_dp_disable_sdp(mtk_dp, packet_type);
+
+ mtk_dp_sdp_vsc_ext_disable(mtk_dp);
+}
+
static void mtk_dp_train_update_swing_pre(struct mtk_dp *mtk_dp, int lanes,
u8 dpcd_adjust_req[2])
{
@@ -1322,6 +1795,55 @@ static int mtk_dp_parse_capabilities(struct mtk_dp *mtk_dp)
return 0;
}

+static bool mtk_dp_edid_parse_audio_capabilities(struct mtk_dp *mtk_dp,
+ struct mtk_dp_audio_cfg *cfg)
+{
+ struct cea_sad *sads;
+ int sad_count;
+ int i;
+ bool ret = false;
+
+ if (mtk_dp_is_edp(mtk_dp))
+ return false;
+
+ mutex_lock(&mtk_dp->edid_lock);
+ if (!mtk_dp->edid) {
+ mutex_unlock(&mtk_dp->edid_lock);
+ dev_err(mtk_dp->dev, "EDID not found!\n");
+ return false;
+ }
+ sad_count = drm_edid_to_sad(mtk_dp->edid, &sads);
+ mutex_unlock(&mtk_dp->edid_lock);
+
+ if (sad_count <= 0) {
+ drm_info(mtk_dp->drm_dev, "The SADs is NULL\n");
+ return false;
+ }
+
+ for (i = 0; i < sad_count; i++) {
+ int sample_rate, word_length;
+
+ /* Only PCM supported at the moment */
+ if (sads[i].format != HDMI_AUDIO_CODING_TYPE_PCM)
+ continue;
+
+ sample_rate = drm_cea_sad_get_sample_rate(&sads[i]);
+ word_length =
+ drm_cea_sad_get_uncompressed_word_length(&sads[i]);
+ if (sample_rate <= 0 || word_length <= 0)
+ continue;
+
+ cfg->channels = sads[i].channels;
+ cfg->word_length_bits = word_length;
+ cfg->sample_rate = sample_rate;
+ ret = true;
+ break;
+ }
+ kfree(sads);
+
+ return ret;
+}
+
static void mtk_dp_train_change_mode(struct mtk_dp *mtk_dp)
{
phy_reset(mtk_dp->phy);
@@ -1419,6 +1941,47 @@ static void mtk_dp_video_enable(struct mtk_dp *mtk_dp, bool enable)
}
}

+static void mtk_dp_audio_sdp_setup(struct mtk_dp *mtk_dp,
+ struct mtk_dp_audio_cfg *cfg)
+{
+ struct mtk_dp_sdp_packet packet;
+ struct hdmi_audio_infoframe frame;
+
+ hdmi_audio_infoframe_init(&frame);
+ frame.coding_type = HDMI_AUDIO_CODING_TYPE_PCM;
+ frame.channels = cfg->channels;
+ frame.sample_frequency = cfg->sample_rate;
+
+ switch (cfg->word_length_bits) {
+ case 16:
+ frame.sample_size = HDMI_AUDIO_SAMPLE_SIZE_16;
+ break;
+ case 20:
+ frame.sample_size = HDMI_AUDIO_SAMPLE_SIZE_20;
+ break;
+ case 24:
+ default:
+ frame.sample_size = HDMI_AUDIO_SAMPLE_SIZE_24;
+ break;
+ }
+
+ packet.type = MTK_DP_SDP_AUI;
+ hdmi_audio_infoframe_pack_for_dp(&frame, &packet.sdp, MTK_DP_VERSION);
+
+ mtk_dp_audio_sdp_asp_set_channels(mtk_dp, cfg->channels);
+ mtk_dp_setup_sdp(mtk_dp, &packet);
+}
+
+static void mtk_dp_audio_setup(struct mtk_dp *mtk_dp,
+ struct mtk_dp_audio_cfg *cfg)
+{
+ mtk_dp_audio_sdp_setup(mtk_dp, cfg);
+ mtk_dp_audio_channel_status_set(mtk_dp, cfg);
+
+ mtk_dp_audio_setup_channels(mtk_dp, cfg);
+ mtk_dp_audio_set_divider(mtk_dp);
+}
+
static int mtk_dp_video_config(struct mtk_dp *mtk_dp)
{
int ret;
@@ -1459,6 +2022,17 @@ static int mtk_dp_training(struct mtk_dp *mtk_dp)
return ret;
mtk_dp_video_enable(mtk_dp, true);

+ mtk_dp->audio_enable =
+ mtk_dp_edid_parse_audio_capabilities(mtk_dp,
+ &mtk_dp->info.audio_caps);
+ if (mtk_dp->audio_enable) {
+ mtk_dp_audio_setup(mtk_dp, &mtk_dp->info.audio_caps);
+ mtk_dp_audio_mute(mtk_dp, false);
+ } else {
+ memset(&mtk_dp->info.audio_caps, 0,
+ sizeof(mtk_dp->info.audio_caps));
+ }
+
return 0;
}

@@ -1536,10 +2110,13 @@ static irqreturn_t mtk_dp_hpd_event(int hpd, void *dev)

if (!train_info->cable_plugged_in) {
mtk_dp_video_mute(mtk_dp, true);
+ mtk_dp_audio_mute(mtk_dp, true);

mtk_dp_initialize_priv_data(mtk_dp);
mtk_dp_set_idle_pattern(mtk_dp, true);
+ mtk_dp_sdp_stop_sending(mtk_dp);

+ mtk_dp_edid_free(mtk_dp);
mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
DP_PWR_STATE_BANDGAP_TPLL,
DP_PWR_STATE_MASK);
@@ -1596,6 +2173,18 @@ static int mtk_dp_dt_parse(struct mtk_dp *mtk_dp,
return 0;
}

+static void mtk_dp_update_plugged_status(struct mtk_dp *mtk_dp)
+{
+ bool connected, has_audio;
+
+ mutex_lock(&mtk_dp->update_plugged_status_lock);
+ connected = mtk_dp_plug_state_avoid_pulse(mtk_dp);
+ has_audio = drm_detect_monitor_audio(mtk_dp->edid);
+ if (mtk_dp->plugged_cb && mtk_dp->codec_dev)
+ mtk_dp->plugged_cb(mtk_dp->codec_dev, connected & has_audio);
+ mutex_unlock(&mtk_dp->update_plugged_status_lock);
+}
+
static enum drm_connector_status mtk_dp_bdg_detect(struct drm_bridge *bridge)
{
struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
@@ -1611,6 +2200,7 @@ static enum drm_connector_status mtk_dp_bdg_detect(struct drm_bridge *bridge)
ret = connector_status_connected;
}

+ mtk_dp_update_plugged_status(mtk_dp);
return ret;
}

@@ -1633,6 +2223,18 @@ static struct edid *mtk_dp_get_edid(struct drm_bridge *bridge,
if (!enabled)
drm_bridge_chain_post_disable(bridge);

+ mutex_lock(&mtk_dp->edid_lock);
+ kfree(mtk_dp->edid);
+ mtk_dp->edid = NULL;
+
+ if (!new_edid) {
+ mutex_unlock(&mtk_dp->edid_lock);
+ return NULL;
+ }
+
+ mtk_dp->edid = drm_edid_duplicate(new_edid);
+ mutex_unlock(&mtk_dp->edid_lock);
+
return new_edid;
}

@@ -1805,6 +2407,7 @@ static void mtk_dp_bridge_atomic_disable(struct drm_bridge *bridge,
}

mtk_dp_video_mute(mtk_dp, true);
+ mtk_dp_audio_mute(mtk_dp, true);

mtk_dp->enabled = false;
/* Ensure the sink is muted */
@@ -1815,6 +2418,7 @@ static void mtk_dp_parse_drm_mode_timings(struct mtk_dp *mtk_dp,
struct drm_display_mode *mode)
{
drm_display_mode_to_videomode(mode, &mtk_dp->info.vm);
+ mtk_dp->info.frame_rate = drm_mode_vrefresh(mode);
}

static void mtk_dp_bridge_atomic_enable(struct drm_bridge *bridge,
@@ -1832,6 +2436,8 @@ static void mtk_dp_bridge_atomic_enable(struct drm_bridge *bridge,
}

mtk_dp_video_mute(mtk_dp, true);
+ mtk_dp_audio_mute(mtk_dp, true);
+ mtk_dp_sdp_stop_sending(mtk_dp);

if (mtk_dp_parse_capabilities(mtk_dp)) {
drm_err(mtk_dp->drm_dev, "Can't parse capabilities\n");
@@ -1845,7 +2451,13 @@ static void mtk_dp_bridge_atomic_enable(struct drm_bridge *bridge,
return;
}

+ mutex_lock(&mtk_dp->eld_lock);
+ memcpy(mtk_dp->connector_eld, mtk_dp->conn->eld, MAX_ELD_BYTES);
+ mutex_unlock(&mtk_dp->eld_lock);
+
mtk_dp->enabled = true;
+
+ mtk_dp_update_plugged_status(mtk_dp);
}

static enum drm_mode_status
@@ -1983,6 +2595,102 @@ static void mtk_dp_debounce_timer(struct timer_list *t)
mtk_dp->need_debounce = true;
}

+/*
+ * HDMI audio codec callbacks
+ */
+static int mtk_dp_audio_hw_params(struct device *dev, void *data,
+ struct hdmi_codec_daifmt *daifmt,
+ struct hdmi_codec_params *params)
+{
+ struct mtk_dp *mtk_dp = dev_get_drvdata(dev);
+ struct mtk_dp_audio_cfg cfg;
+
+ if (!mtk_dp->enabled) {
+ dev_err(mtk_dp->dev, "%s, DP is not ready!\n", __func__);
+ return -ENODEV;
+ }
+
+ cfg.channels = params->cea.channels;
+ cfg.sample_rate = params->sample_rate;
+ cfg.word_length_bits = 24;
+
+ mtk_dp_audio_setup(mtk_dp, &cfg);
+
+ return 0;
+}
+
+static int mtk_dp_audio_startup(struct device *dev, void *data)
+{
+ struct mtk_dp *mtk_dp = dev_get_drvdata(dev);
+
+ mtk_dp_audio_mute(mtk_dp, false);
+
+ return 0;
+}
+
+static void mtk_dp_audio_shutdown(struct device *dev, void *data)
+{
+ struct mtk_dp *mtk_dp = dev_get_drvdata(dev);
+
+ mtk_dp_audio_mute(mtk_dp, true);
+}
+
+static int mtk_dp_audio_get_eld(struct device *dev, void *data, uint8_t *buf,
+ size_t len)
+{
+ struct mtk_dp *mtk_dp = dev_get_drvdata(dev);
+
+ if (mtk_dp->enabled)
+ memcpy(buf, mtk_dp->connector_eld, len);
+ else
+ memset(buf, 0, len);
+
+ return 0;
+}
+
+static int mtk_dp_audio_hook_plugged_cb(struct device *dev, void *data,
+ hdmi_codec_plugged_cb fn,
+ struct device *codec_dev)
+{
+ struct mtk_dp *mtk_dp = data;
+
+ mutex_lock(&mtk_dp->update_plugged_status_lock);
+ mtk_dp->plugged_cb = fn;
+ mtk_dp->codec_dev = codec_dev;
+ mutex_unlock(&mtk_dp->update_plugged_status_lock);
+
+ mtk_dp_update_plugged_status(mtk_dp);
+
+ return 0;
+}
+
+static const struct hdmi_codec_ops mtk_dp_audio_codec_ops = {
+ .hw_params = mtk_dp_audio_hw_params,
+ .audio_startup = mtk_dp_audio_startup,
+ .audio_shutdown = mtk_dp_audio_shutdown,
+ .get_eld = mtk_dp_audio_get_eld,
+ .hook_plugged_cb = mtk_dp_audio_hook_plugged_cb,
+ .no_capture_mute = 1,
+};
+
+static int mtk_dp_register_audio_driver(struct device *dev)
+{
+ struct mtk_dp *mtk_dp = dev_get_drvdata(dev);
+ struct hdmi_codec_pdata codec_data = {
+ .ops = &mtk_dp_audio_codec_ops,
+ .max_i2s_channels = 8,
+ .i2s = 1,
+ .data = mtk_dp,
+ };
+
+ mtk_dp->audio_pdev = platform_device_register_data(dev,
+ HDMI_CODEC_DRV_NAME,
+ PLATFORM_DEVID_AUTO,
+ &codec_data,
+ sizeof(codec_data));
+ return PTR_ERR_OR_ZERO(mtk_dp->audio_pdev);
+}
+
static int mtk_dp_probe(struct platform_device *pdev)
{
struct mtk_dp *mtk_dp;
@@ -2028,8 +2736,21 @@ static int mtk_dp_probe(struct platform_device *pdev)
return dev_err_probe(dev, -EPROBE_DEFER,
"failed to request mediatek dptx irq\n");

+ mutex_init(&mtk_dp->edid_lock);
+ mutex_init(&mtk_dp->eld_lock);
+ mutex_init(&mtk_dp->update_plugged_status_lock);
+
platform_set_drvdata(pdev, mtk_dp);

+ if (!mtk_dp_is_edp(mtk_dp)) {
+ ret = mtk_dp_register_audio_driver(dev);
+ if (ret) {
+ dev_err(dev, "Failed to register audio driver: %d\n",
+ ret);
+ return ret;
+ }
+ }
+
mtk_dp->phy_dev = platform_device_register_data(dev, "mediatek-dp-phy",
PLATFORM_DEVID_AUTO,
&mtk_dp->regs,
@@ -2074,7 +2795,11 @@ static int mtk_dp_remove(struct platform_device *pdev)
struct mtk_dp *mtk_dp = platform_get_drvdata(pdev);

platform_device_unregister(mtk_dp->phy_dev);
+ if (mtk_dp->audio_pdev)
+ platform_device_unregister(mtk_dp->audio_pdev);
+
mtk_dp_video_mute(mtk_dp, true);
+ mtk_dp_audio_mute(mtk_dp, true);
del_timer_sync(&mtk_dp->debounce_timer);

pm_runtime_disable(&pdev->dev);
diff --git a/drivers/gpu/drm/mediatek/mtk_dp_reg.h b/drivers/gpu/drm/mediatek/mtk_dp_reg.h
index 59086eb82868..325b01f43348 100644
--- a/drivers/gpu/drm/mediatek/mtk_dp_reg.h
+++ b/drivers/gpu/drm/mediatek/mtk_dp_reg.h
@@ -240,6 +240,8 @@
#define ASP_HB3_DP_ENC0_P0_MASK GENMASK(15, 8)
#define ASP_HB3_DP_ENC0_P0_SHIFT BIT(3)

+#define MTK_DP_ENC0_P0_3130 (ENC0_OFFSET + 0x130)
+#define MTK_DP_ENC0_P0_3138 (ENC0_OFFSET + 0x138)
#define MTK_DP_ENC0_P0_3154 (ENC0_OFFSET + 0x154)
#define PGEN_HTOTAL_DP_ENC0_P0_MASK GENMASK(13, 0)
#define MTK_DP_ENC0_P0_3158 (ENC0_OFFSET + 0x158)
--
2.18.0