diff options
Diffstat (limited to 'drivers/gpu/drm/radeon/atombios_dp.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/atombios_dp.c | 858 |
1 files changed, 858 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c new file mode 100644 index 000000000..009333645 --- /dev/null +++ b/drivers/gpu/drm/radeon/atombios_dp.c @@ -0,0 +1,858 @@ +/* + * 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 + * Jerome Glisse + */ + +#include <drm/radeon_drm.h> +#include "radeon.h" + +#include "atom.h" +#include "atom-bits.h" +#include <drm/display/drm_dp_helper.h> + +/* move these to drm_dp_helper.c/h */ +#define DP_LINK_CONFIGURATION_SIZE 9 +#define DP_DPCD_SIZE DP_RECEIVER_CAP_SIZE + +static char *voltage_names[] = { + "0.4V", "0.6V", "0.8V", "1.2V" +}; +static char *pre_emph_names[] = { + "0dB", "3.5dB", "6dB", "9.5dB" +}; + +/***** radeon AUX functions *****/ + +/* Atom needs data in little endian format so swap as appropriate when copying + * data to or from atom. Note that atom operates on dw units. + * + * Use to_le=true when sending data to atom and provide at least + * ALIGN(num_bytes,4) bytes in the dst buffer. + * + * Use to_le=false when receiving data from atom and provide ALIGN(num_bytes,4) + * byes in the src buffer. + */ +void radeon_atom_copy_swap(u8 *dst, u8 *src, u8 num_bytes, bool to_le) +{ +#ifdef __BIG_ENDIAN + u32 src_tmp[5], dst_tmp[5]; + int i; + u8 align_num_bytes = ALIGN(num_bytes, 4); + + if (to_le) { + memcpy(src_tmp, src, num_bytes); + for (i = 0; i < align_num_bytes / 4; i++) + dst_tmp[i] = cpu_to_le32(src_tmp[i]); + memcpy(dst, dst_tmp, align_num_bytes); + } else { + memcpy(src_tmp, src, align_num_bytes); + for (i = 0; i < align_num_bytes / 4; i++) + dst_tmp[i] = le32_to_cpu(src_tmp[i]); + memcpy(dst, dst_tmp, num_bytes); + } +#else + memcpy(dst, src, num_bytes); +#endif +} + +union aux_channel_transaction { + PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION v1; + PROCESS_AUX_CHANNEL_TRANSACTION_PARAMETERS_V2 v2; +}; + +static int radeon_process_aux_ch(struct radeon_i2c_chan *chan, + u8 *send, int send_bytes, + u8 *recv, int recv_size, + u8 delay, u8 *ack) +{ + struct drm_device *dev = chan->dev; + struct radeon_device *rdev = dev->dev_private; + union aux_channel_transaction args; + int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction); + unsigned char *base; + int recv_bytes; + int r = 0; + + memset(&args, 0, sizeof(args)); + + mutex_lock(&chan->mutex); + mutex_lock(&rdev->mode_info.atom_context->scratch_mutex); + + base = (unsigned char *)(rdev->mode_info.atom_context->scratch + 1); + + radeon_atom_copy_swap(base, send, send_bytes, true); + + args.v1.lpAuxRequest = cpu_to_le16((u16)(0 + 4)); + args.v1.lpDataOut = cpu_to_le16((u16)(16 + 4)); + args.v1.ucDataOutLen = 0; + args.v1.ucChannelID = chan->rec.i2c_id; + args.v1.ucDelay = delay / 10; + if (ASIC_IS_DCE4(rdev)) + args.v2.ucHPD_ID = chan->rec.hpd; + + atom_execute_table_scratch_unlocked(rdev->mode_info.atom_context, index, (uint32_t *)&args); + + *ack = args.v1.ucReplyStatus; + + /* timeout */ + if (args.v1.ucReplyStatus == 1) { + DRM_DEBUG_KMS("dp_aux_ch timeout\n"); + r = -ETIMEDOUT; + goto done; + } + + /* flags not zero */ + if (args.v1.ucReplyStatus == 2) { + DRM_DEBUG_KMS("dp_aux_ch flags not zero\n"); + r = -EIO; + goto done; + } + + /* error */ + if (args.v1.ucReplyStatus == 3) { + DRM_DEBUG_KMS("dp_aux_ch error\n"); + r = -EIO; + goto done; + } + + recv_bytes = args.v1.ucDataOutLen; + if (recv_bytes > recv_size) + recv_bytes = recv_size; + + if (recv && recv_size) + radeon_atom_copy_swap(recv, base + 16, recv_bytes, false); + + r = recv_bytes; +done: + mutex_unlock(&rdev->mode_info.atom_context->scratch_mutex); + mutex_unlock(&chan->mutex); + + return r; +} + +#define BARE_ADDRESS_SIZE 3 +#define HEADER_SIZE (BARE_ADDRESS_SIZE + 1) + +static ssize_t +radeon_dp_aux_transfer_atom(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) +{ + struct radeon_i2c_chan *chan = + container_of(aux, struct radeon_i2c_chan, aux); + int ret; + u8 tx_buf[20]; + size_t tx_size; + u8 ack, delay = 0; + + if (WARN_ON(msg->size > 16)) + return -E2BIG; + + tx_buf[0] = msg->address & 0xff; + tx_buf[1] = (msg->address >> 8) & 0xff; + tx_buf[2] = (msg->request << 4) | + ((msg->address >> 16) & 0xf); + tx_buf[3] = msg->size ? (msg->size - 1) : 0; + + switch (msg->request & ~DP_AUX_I2C_MOT) { + case DP_AUX_NATIVE_WRITE: + case DP_AUX_I2C_WRITE: + case DP_AUX_I2C_WRITE_STATUS_UPDATE: + /* The atom implementation only supports writes with a max payload of + * 12 bytes since it uses 4 bits for the total count (header + payload) + * in the parameter space. The atom interface supports 16 byte + * payloads for reads. The hw itself supports up to 16 bytes of payload. + */ + if (WARN_ON_ONCE(msg->size > 12)) + return -E2BIG; + /* tx_size needs to be 4 even for bare address packets since the atom + * table needs the info in tx_buf[3]. + */ + tx_size = HEADER_SIZE + msg->size; + if (msg->size == 0) + tx_buf[3] |= BARE_ADDRESS_SIZE << 4; + else + tx_buf[3] |= tx_size << 4; + memcpy(tx_buf + HEADER_SIZE, msg->buffer, msg->size); + ret = radeon_process_aux_ch(chan, + tx_buf, tx_size, NULL, 0, delay, &ack); + if (ret >= 0) + /* Return payload size. */ + ret = msg->size; + break; + case DP_AUX_NATIVE_READ: + case DP_AUX_I2C_READ: + /* tx_size needs to be 4 even for bare address packets since the atom + * table needs the info in tx_buf[3]. + */ + tx_size = HEADER_SIZE; + if (msg->size == 0) + tx_buf[3] |= BARE_ADDRESS_SIZE << 4; + else + tx_buf[3] |= tx_size << 4; + ret = radeon_process_aux_ch(chan, + tx_buf, tx_size, msg->buffer, msg->size, delay, &ack); + break; + default: + ret = -EINVAL; + break; + } + + if (ret >= 0) + msg->reply = ack >> 4; + + return ret; +} + +void radeon_dp_aux_init(struct radeon_connector *radeon_connector) +{ + struct drm_device *dev = radeon_connector->base.dev; + struct radeon_device *rdev = dev->dev_private; + int ret; + + radeon_connector->ddc_bus->rec.hpd = radeon_connector->hpd.hpd; + radeon_connector->ddc_bus->aux.dev = radeon_connector->base.kdev; + radeon_connector->ddc_bus->aux.drm_dev = radeon_connector->base.dev; + if (ASIC_IS_DCE5(rdev)) { + if (radeon_auxch) + radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_native; + else + radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_atom; + } else { + radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_atom; + } + + ret = drm_dp_aux_register(&radeon_connector->ddc_bus->aux); + if (!ret) + radeon_connector->ddc_bus->has_aux = true; + + WARN(ret, "drm_dp_aux_register() failed with error %d\n", ret); +} + +/***** general DP utility functions *****/ + +#define DP_VOLTAGE_MAX DP_TRAIN_VOLTAGE_SWING_LEVEL_3 +#define DP_PRE_EMPHASIS_MAX DP_TRAIN_PRE_EMPH_LEVEL_3 + +static void dp_get_adjust_train(const u8 link_status[DP_LINK_STATUS_SIZE], + int lane_count, + u8 train_set[4]) +{ + u8 v = 0; + u8 p = 0; + int lane; + + for (lane = 0; lane < lane_count; lane++) { + u8 this_v = drm_dp_get_adjust_request_voltage(link_status, lane); + u8 this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane); + + DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n", + lane, + voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT], + pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]); + + if (this_v > v) + v = this_v; + if (this_p > p) + p = this_p; + } + + if (v >= DP_VOLTAGE_MAX) + v |= DP_TRAIN_MAX_SWING_REACHED; + + if (p >= DP_PRE_EMPHASIS_MAX) + p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED; + + DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n", + voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT], + pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]); + + for (lane = 0; lane < 4; lane++) + train_set[lane] = v | p; +} + +/* convert bits per color to bits per pixel */ +/* get bpc from the EDID */ +static int convert_bpc_to_bpp(int bpc) +{ + if (bpc == 0) + return 24; + else + return bpc * 3; +} + +/***** radeon specific DP functions *****/ + +static int radeon_dp_get_dp_link_config(struct drm_connector *connector, + const u8 dpcd[DP_DPCD_SIZE], + unsigned pix_clock, + unsigned *dp_lanes, unsigned *dp_rate) +{ + int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector)); + static const unsigned link_rates[3] = { 162000, 270000, 540000 }; + unsigned max_link_rate = drm_dp_max_link_rate(dpcd); + unsigned max_lane_num = drm_dp_max_lane_count(dpcd); + unsigned lane_num, i, max_pix_clock; + + if (radeon_connector_encoder_get_dp_bridge_encoder_id(connector) == + ENCODER_OBJECT_ID_NUTMEG) { + for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) { + max_pix_clock = (lane_num * 270000 * 8) / bpp; + if (max_pix_clock >= pix_clock) { + *dp_lanes = lane_num; + *dp_rate = 270000; + return 0; + } + } + } else { + for (i = 0; i < ARRAY_SIZE(link_rates) && link_rates[i] <= max_link_rate; i++) { + for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) { + max_pix_clock = (lane_num * link_rates[i] * 8) / bpp; + if (max_pix_clock >= pix_clock) { + *dp_lanes = lane_num; + *dp_rate = link_rates[i]; + return 0; + } + } + } + } + + return -EINVAL; +} + +static u8 radeon_dp_encoder_service(struct radeon_device *rdev, + int action, int dp_clock, + u8 ucconfig, u8 lane_num) +{ + DP_ENCODER_SERVICE_PARAMETERS args; + int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService); + + memset(&args, 0, sizeof(args)); + args.ucLinkClock = dp_clock / 10; + args.ucConfig = ucconfig; + args.ucAction = action; + args.ucLaneNum = lane_num; + args.ucStatus = 0; + + atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args); + return args.ucStatus; +} + +u8 radeon_dp_getsinktype(struct radeon_connector *radeon_connector) +{ + struct drm_device *dev = radeon_connector->base.dev; + struct radeon_device *rdev = dev->dev_private; + + return radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_GET_SINK_TYPE, 0, + radeon_connector->ddc_bus->rec.i2c_id, 0); +} + +static void radeon_dp_probe_oui(struct radeon_connector *radeon_connector) +{ + struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv; + u8 buf[3]; + + if (!(dig_connector->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT)) + return; + + if (drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_SINK_OUI, buf, 3) == 3) + DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n", + buf[0], buf[1], buf[2]); + + if (drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_BRANCH_OUI, buf, 3) == 3) + DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n", + buf[0], buf[1], buf[2]); +} + +bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector) +{ + struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv; + u8 msg[DP_DPCD_SIZE]; + int ret; + + ret = drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_DPCD_REV, msg, + DP_DPCD_SIZE); + if (ret == DP_DPCD_SIZE) { + memcpy(dig_connector->dpcd, msg, DP_DPCD_SIZE); + + DRM_DEBUG_KMS("DPCD: %*ph\n", (int)sizeof(dig_connector->dpcd), + dig_connector->dpcd); + + radeon_dp_probe_oui(radeon_connector); + + return true; + } + + dig_connector->dpcd[0] = 0; + return false; +} + +int radeon_dp_get_panel_mode(struct drm_encoder *encoder, + struct drm_connector *connector) +{ + struct drm_device *dev = encoder->dev; + struct radeon_device *rdev = dev->dev_private; + struct radeon_connector *radeon_connector = to_radeon_connector(connector); + int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE; + u16 dp_bridge = radeon_connector_encoder_get_dp_bridge_encoder_id(connector); + u8 tmp; + + if (!ASIC_IS_DCE4(rdev)) + return panel_mode; + + if (!radeon_connector->con_priv) + return panel_mode; + + if (dp_bridge != ENCODER_OBJECT_ID_NONE) { + /* DP bridge chips */ + if (drm_dp_dpcd_readb(&radeon_connector->ddc_bus->aux, + DP_EDP_CONFIGURATION_CAP, &tmp) == 1) { + if (tmp & 1) + panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE; + else if ((dp_bridge == ENCODER_OBJECT_ID_NUTMEG) || + (dp_bridge == ENCODER_OBJECT_ID_TRAVIS)) + panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE; + else + panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE; + } + } else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) { + /* eDP */ + if (drm_dp_dpcd_readb(&radeon_connector->ddc_bus->aux, + DP_EDP_CONFIGURATION_CAP, &tmp) == 1) { + if (tmp & 1) + panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE; + } + } + + return panel_mode; +} + +void radeon_dp_set_link_config(struct drm_connector *connector, + const struct drm_display_mode *mode) +{ + struct radeon_connector *radeon_connector = to_radeon_connector(connector); + struct radeon_connector_atom_dig *dig_connector; + int ret; + + if (!radeon_connector->con_priv) + return; + dig_connector = radeon_connector->con_priv; + + if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) || + (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) { + ret = radeon_dp_get_dp_link_config(connector, dig_connector->dpcd, + mode->clock, + &dig_connector->dp_lane_count, + &dig_connector->dp_clock); + if (ret) { + dig_connector->dp_clock = 0; + dig_connector->dp_lane_count = 0; + } + } +} + +int radeon_dp_mode_valid_helper(struct drm_connector *connector, + struct drm_display_mode *mode) +{ + struct radeon_connector *radeon_connector = to_radeon_connector(connector); + struct radeon_connector_atom_dig *dig_connector; + unsigned dp_clock, dp_lanes; + int ret; + + if ((mode->clock > 340000) && + (!radeon_connector_is_dp12_capable(connector))) + return MODE_CLOCK_HIGH; + + if (!radeon_connector->con_priv) + return MODE_CLOCK_HIGH; + dig_connector = radeon_connector->con_priv; + + ret = radeon_dp_get_dp_link_config(connector, dig_connector->dpcd, + mode->clock, + &dp_lanes, + &dp_clock); + if (ret) + return MODE_CLOCK_HIGH; + + if ((dp_clock == 540000) && + (!radeon_connector_is_dp12_capable(connector))) + return MODE_CLOCK_HIGH; + + return MODE_OK; +} + +bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector) +{ + u8 link_status[DP_LINK_STATUS_SIZE]; + struct radeon_connector_atom_dig *dig = radeon_connector->con_priv; + + if (drm_dp_dpcd_read_link_status(&radeon_connector->ddc_bus->aux, link_status) + <= 0) + return false; + if (drm_dp_channel_eq_ok(link_status, dig->dp_lane_count)) + return false; + return true; +} + +void radeon_dp_set_rx_power_state(struct drm_connector *connector, + u8 power_state) +{ + struct radeon_connector *radeon_connector = to_radeon_connector(connector); + struct radeon_connector_atom_dig *dig_connector; + + if (!radeon_connector->con_priv) + return; + + dig_connector = radeon_connector->con_priv; + + /* power up/down the sink */ + if (dig_connector->dpcd[0] >= 0x11) { + drm_dp_dpcd_writeb(&radeon_connector->ddc_bus->aux, + DP_SET_POWER, power_state); + usleep_range(1000, 2000); + } +} + + +struct radeon_dp_link_train_info { + struct radeon_device *rdev; + struct drm_encoder *encoder; + struct drm_connector *connector; + int enc_id; + int dp_clock; + int dp_lane_count; + bool tp3_supported; + u8 dpcd[DP_RECEIVER_CAP_SIZE]; + u8 train_set[4]; + u8 link_status[DP_LINK_STATUS_SIZE]; + u8 tries; + bool use_dpencoder; + struct drm_dp_aux *aux; +}; + +static void radeon_dp_update_vs_emph(struct radeon_dp_link_train_info *dp_info) +{ + /* set the initial vs/emph on the source */ + atombios_dig_transmitter_setup(dp_info->encoder, + ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH, + 0, dp_info->train_set[0]); /* sets all lanes at once */ + + /* set the vs/emph on the sink */ + drm_dp_dpcd_write(dp_info->aux, DP_TRAINING_LANE0_SET, + dp_info->train_set, dp_info->dp_lane_count); +} + +static void radeon_dp_set_tp(struct radeon_dp_link_train_info *dp_info, int tp) +{ + int rtp = 0; + + /* set training pattern on the source */ + if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder) { + switch (tp) { + case DP_TRAINING_PATTERN_1: + rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN1; + break; + case DP_TRAINING_PATTERN_2: + rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2; + break; + case DP_TRAINING_PATTERN_3: + rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN3; + break; + } + atombios_dig_encoder_setup(dp_info->encoder, rtp, 0); + } else { + switch (tp) { + case DP_TRAINING_PATTERN_1: + rtp = 0; + break; + case DP_TRAINING_PATTERN_2: + rtp = 1; + break; + } + radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL, + dp_info->dp_clock, dp_info->enc_id, rtp); + } + + /* enable training pattern on the sink */ + drm_dp_dpcd_writeb(dp_info->aux, DP_TRAINING_PATTERN_SET, tp); +} + +static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info) +{ + struct radeon_encoder *radeon_encoder = to_radeon_encoder(dp_info->encoder); + struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv; + u8 tmp; + + /* power up the sink */ + radeon_dp_set_rx_power_state(dp_info->connector, DP_SET_POWER_D0); + + /* possibly enable downspread on the sink */ + if (dp_info->dpcd[3] & 0x1) + drm_dp_dpcd_writeb(dp_info->aux, + DP_DOWNSPREAD_CTRL, DP_SPREAD_AMP_0_5); + else + drm_dp_dpcd_writeb(dp_info->aux, + DP_DOWNSPREAD_CTRL, 0); + + if (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE) + drm_dp_dpcd_writeb(dp_info->aux, DP_EDP_CONFIGURATION_SET, 1); + + /* set the lane count on the sink */ + tmp = dp_info->dp_lane_count; + if (drm_dp_enhanced_frame_cap(dp_info->dpcd)) + tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN; + drm_dp_dpcd_writeb(dp_info->aux, DP_LANE_COUNT_SET, tmp); + + /* set the link rate on the sink */ + tmp = drm_dp_link_rate_to_bw_code(dp_info->dp_clock); + drm_dp_dpcd_writeb(dp_info->aux, DP_LINK_BW_SET, tmp); + + /* start training on the source */ + if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder) + atombios_dig_encoder_setup(dp_info->encoder, + ATOM_ENCODER_CMD_DP_LINK_TRAINING_START, 0); + else + radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_START, + dp_info->dp_clock, dp_info->enc_id, 0); + + /* disable the training pattern on the sink */ + drm_dp_dpcd_writeb(dp_info->aux, + DP_TRAINING_PATTERN_SET, + DP_TRAINING_PATTERN_DISABLE); + + return 0; +} + +static int radeon_dp_link_train_finish(struct radeon_dp_link_train_info *dp_info) +{ + udelay(400); + + /* disable the training pattern on the sink */ + drm_dp_dpcd_writeb(dp_info->aux, + DP_TRAINING_PATTERN_SET, + DP_TRAINING_PATTERN_DISABLE); + + /* disable the training pattern on the source */ + if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder) + atombios_dig_encoder_setup(dp_info->encoder, + ATOM_ENCODER_CMD_DP_LINK_TRAINING_COMPLETE, 0); + else + radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_COMPLETE, + dp_info->dp_clock, dp_info->enc_id, 0); + + return 0; +} + +static int radeon_dp_link_train_cr(struct radeon_dp_link_train_info *dp_info) +{ + bool clock_recovery; + u8 voltage; + int i; + + radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_1); + memset(dp_info->train_set, 0, 4); + radeon_dp_update_vs_emph(dp_info); + + udelay(400); + + /* clock recovery loop */ + clock_recovery = false; + dp_info->tries = 0; + voltage = 0xff; + while (1) { + drm_dp_link_train_clock_recovery_delay(dp_info->aux, dp_info->dpcd); + + if (drm_dp_dpcd_read_link_status(dp_info->aux, + dp_info->link_status) <= 0) { + DRM_ERROR("displayport link status failed\n"); + break; + } + + if (drm_dp_clock_recovery_ok(dp_info->link_status, dp_info->dp_lane_count)) { + clock_recovery = true; + break; + } + + for (i = 0; i < dp_info->dp_lane_count; i++) { + if ((dp_info->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0) + break; + } + if (i == dp_info->dp_lane_count) { + DRM_ERROR("clock recovery reached max voltage\n"); + break; + } + + if ((dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) { + ++dp_info->tries; + if (dp_info->tries == 5) { + DRM_ERROR("clock recovery tried 5 times\n"); + break; + } + } else + dp_info->tries = 0; + + voltage = dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK; + + /* Compute new train_set as requested by sink */ + dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set); + + radeon_dp_update_vs_emph(dp_info); + } + if (!clock_recovery) { + DRM_ERROR("clock recovery failed\n"); + return -1; + } else { + DRM_DEBUG_KMS("clock recovery at voltage %d pre-emphasis %d\n", + dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK, + (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >> + DP_TRAIN_PRE_EMPHASIS_SHIFT); + return 0; + } +} + +static int radeon_dp_link_train_ce(struct radeon_dp_link_train_info *dp_info) +{ + bool channel_eq; + + if (dp_info->tp3_supported) + radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_3); + else + radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_2); + + /* channel equalization loop */ + dp_info->tries = 0; + channel_eq = false; + while (1) { + drm_dp_link_train_channel_eq_delay(dp_info->aux, dp_info->dpcd); + + if (drm_dp_dpcd_read_link_status(dp_info->aux, + dp_info->link_status) <= 0) { + DRM_ERROR("displayport link status failed\n"); + break; + } + + if (drm_dp_channel_eq_ok(dp_info->link_status, dp_info->dp_lane_count)) { + channel_eq = true; + break; + } + + /* Try 5 times */ + if (dp_info->tries > 5) { + DRM_ERROR("channel eq failed: 5 tries\n"); + break; + } + + /* Compute new train_set as requested by sink */ + dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set); + + radeon_dp_update_vs_emph(dp_info); + dp_info->tries++; + } + + if (!channel_eq) { + DRM_ERROR("channel eq failed\n"); + return -1; + } else { + DRM_DEBUG_KMS("channel eq at voltage %d pre-emphasis %d\n", + dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK, + (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) + >> DP_TRAIN_PRE_EMPHASIS_SHIFT); + return 0; + } +} + +void radeon_dp_link_train(struct drm_encoder *encoder, + struct drm_connector *connector) +{ + 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; + struct radeon_connector *radeon_connector; + struct radeon_connector_atom_dig *dig_connector; + struct radeon_dp_link_train_info dp_info; + int index; + u8 tmp, frev, crev; + + if (!radeon_encoder->enc_priv) + return; + dig = radeon_encoder->enc_priv; + + radeon_connector = to_radeon_connector(connector); + if (!radeon_connector->con_priv) + return; + dig_connector = radeon_connector->con_priv; + + if ((dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_DISPLAYPORT) && + (dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_eDP)) + return; + + /* DPEncoderService newer than 1.1 can't program properly the + * training pattern. When facing such version use the + * DIGXEncoderControl (X== 1 | 2) + */ + dp_info.use_dpencoder = true; + index = GetIndexIntoMasterTable(COMMAND, DPEncoderService); + if (atom_parse_cmd_header(rdev->mode_info.atom_context, index, &frev, &crev)) { + if (crev > 1) + dp_info.use_dpencoder = false; + } + + dp_info.enc_id = 0; + if (dig->dig_encoder) + dp_info.enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER; + else + dp_info.enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER; + if (dig->linkb) + dp_info.enc_id |= ATOM_DP_CONFIG_LINK_B; + else + dp_info.enc_id |= ATOM_DP_CONFIG_LINK_A; + + if (drm_dp_dpcd_readb(&radeon_connector->ddc_bus->aux, DP_MAX_LANE_COUNT, &tmp) + == 1) { + if (ASIC_IS_DCE5(rdev) && (tmp & DP_TPS3_SUPPORTED)) + dp_info.tp3_supported = true; + else + dp_info.tp3_supported = false; + } else { + dp_info.tp3_supported = false; + } + + memcpy(dp_info.dpcd, dig_connector->dpcd, DP_RECEIVER_CAP_SIZE); + dp_info.rdev = rdev; + dp_info.encoder = encoder; + dp_info.connector = connector; + dp_info.dp_lane_count = dig_connector->dp_lane_count; + dp_info.dp_clock = dig_connector->dp_clock; + dp_info.aux = &radeon_connector->ddc_bus->aux; + + if (radeon_dp_link_train_init(&dp_info)) + goto done; + if (radeon_dp_link_train_cr(&dp_info)) + goto done; + if (radeon_dp_link_train_ce(&dp_info)) + goto done; +done: + if (radeon_dp_link_train_finish(&dp_info)) + return; +} |