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path: root/drivers/gpu/drm/radeon/atombios_dp.c
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Diffstat (limited to 'drivers/gpu/drm/radeon/atombios_dp.c')
-rw-r--r--drivers/gpu/drm/radeon/atombios_dp.c790
1 files changed, 790 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 000000000000..0d63c4436e7c
--- /dev/null
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -0,0 +1,790 @@
+/*
+ * Copyright 2007-8 Advanced Micro Devices, Inc.
+ * Copyright 2008 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Dave Airlie
+ * Alex Deucher
+ */
+#include "drmP.h"
+#include "radeon_drm.h"
+#include "radeon.h"
+
+#include "atom.h"
+#include "atom-bits.h"
+#include "drm_dp_helper.h"
+
+/* move these to drm_dp_helper.c/h */
+#define DP_LINK_CONFIGURATION_SIZE 9
+#define DP_LINK_STATUS_SIZE 6
+#define DP_DPCD_SIZE 8
+
+static char *voltage_names[] = {
+ "0.4V", "0.6V", "0.8V", "1.2V"
+};
+static char *pre_emph_names[] = {
+ "0dB", "3.5dB", "6dB", "9.5dB"
+};
+
+static const int dp_clocks[] = {
+ 54000, /* 1 lane, 1.62 Ghz */
+ 90000, /* 1 lane, 2.70 Ghz */
+ 108000, /* 2 lane, 1.62 Ghz */
+ 180000, /* 2 lane, 2.70 Ghz */
+ 216000, /* 4 lane, 1.62 Ghz */
+ 360000, /* 4 lane, 2.70 Ghz */
+};
+
+static const int num_dp_clocks = sizeof(dp_clocks) / sizeof(int);
+
+/* common helper functions */
+static int dp_lanes_for_mode_clock(u8 dpcd[DP_DPCD_SIZE], int mode_clock)
+{
+ int i;
+ u8 max_link_bw;
+ u8 max_lane_count;
+
+ if (!dpcd)
+ return 0;
+
+ max_link_bw = dpcd[DP_MAX_LINK_RATE];
+ max_lane_count = dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
+
+ switch (max_link_bw) {
+ case DP_LINK_BW_1_62:
+ default:
+ for (i = 0; i < num_dp_clocks; i++) {
+ if (i % 2)
+ continue;
+ switch (max_lane_count) {
+ case 1:
+ if (i > 1)
+ return 0;
+ break;
+ case 2:
+ if (i > 3)
+ return 0;
+ break;
+ case 4:
+ default:
+ break;
+ }
+ if (dp_clocks[i] > mode_clock) {
+ if (i < 2)
+ return 1;
+ else if (i < 4)
+ return 2;
+ else
+ return 4;
+ }
+ }
+ break;
+ case DP_LINK_BW_2_7:
+ for (i = 0; i < num_dp_clocks; i++) {
+ switch (max_lane_count) {
+ case 1:
+ if (i > 1)
+ return 0;
+ break;
+ case 2:
+ if (i > 3)
+ return 0;
+ break;
+ case 4:
+ default:
+ break;
+ }
+ if (dp_clocks[i] > mode_clock) {
+ if (i < 2)
+ return 1;
+ else if (i < 4)
+ return 2;
+ else
+ return 4;
+ }
+ }
+ break;
+ }
+
+ return 0;
+}
+
+static int dp_link_clock_for_mode_clock(u8 dpcd[DP_DPCD_SIZE], int mode_clock)
+{
+ int i;
+ u8 max_link_bw;
+ u8 max_lane_count;
+
+ if (!dpcd)
+ return 0;
+
+ max_link_bw = dpcd[DP_MAX_LINK_RATE];
+ max_lane_count = dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
+
+ switch (max_link_bw) {
+ case DP_LINK_BW_1_62:
+ default:
+ for (i = 0; i < num_dp_clocks; i++) {
+ if (i % 2)
+ continue;
+ switch (max_lane_count) {
+ case 1:
+ if (i > 1)
+ return 0;
+ break;
+ case 2:
+ if (i > 3)
+ return 0;
+ break;
+ case 4:
+ default:
+ break;
+ }
+ if (dp_clocks[i] > mode_clock)
+ return 162000;
+ }
+ break;
+ case DP_LINK_BW_2_7:
+ for (i = 0; i < num_dp_clocks; i++) {
+ switch (max_lane_count) {
+ case 1:
+ if (i > 1)
+ return 0;
+ break;
+ case 2:
+ if (i > 3)
+ return 0;
+ break;
+ case 4:
+ default:
+ break;
+ }
+ if (dp_clocks[i] > mode_clock)
+ return (i % 2) ? 270000 : 162000;
+ }
+ }
+
+ return 0;
+}
+
+int dp_mode_valid(u8 dpcd[DP_DPCD_SIZE], int mode_clock)
+{
+ int lanes = dp_lanes_for_mode_clock(dpcd, mode_clock);
+ int bw = dp_lanes_for_mode_clock(dpcd, mode_clock);
+
+ if ((lanes == 0) || (bw == 0))
+ return MODE_CLOCK_HIGH;
+
+ return MODE_OK;
+}
+
+static u8 dp_link_status(u8 link_status[DP_LINK_STATUS_SIZE], int r)
+{
+ return link_status[r - DP_LANE0_1_STATUS];
+}
+
+static u8 dp_get_lane_status(u8 link_status[DP_LINK_STATUS_SIZE],
+ int lane)
+{
+ int i = DP_LANE0_1_STATUS + (lane >> 1);
+ int s = (lane & 1) * 4;
+ u8 l = dp_link_status(link_status, i);
+ return (l >> s) & 0xf;
+}
+
+static bool dp_clock_recovery_ok(u8 link_status[DP_LINK_STATUS_SIZE],
+ int lane_count)
+{
+ int lane;
+ u8 lane_status;
+
+ for (lane = 0; lane < lane_count; lane++) {
+ lane_status = dp_get_lane_status(link_status, lane);
+ if ((lane_status & DP_LANE_CR_DONE) == 0)
+ return false;
+ }
+ return true;
+}
+
+static bool dp_channel_eq_ok(u8 link_status[DP_LINK_STATUS_SIZE],
+ int lane_count)
+{
+ u8 lane_align;
+ u8 lane_status;
+ int lane;
+
+ lane_align = dp_link_status(link_status,
+ DP_LANE_ALIGN_STATUS_UPDATED);
+ if ((lane_align & DP_INTERLANE_ALIGN_DONE) == 0)
+ return false;
+ for (lane = 0; lane < lane_count; lane++) {
+ lane_status = dp_get_lane_status(link_status, lane);
+ if ((lane_status & DP_CHANNEL_EQ_BITS) != DP_CHANNEL_EQ_BITS)
+ return false;
+ }
+ return true;
+}
+
+static u8 dp_get_adjust_request_voltage(uint8_t link_status[DP_LINK_STATUS_SIZE],
+ int lane)
+
+{
+ int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
+ int s = ((lane & 1) ?
+ DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT :
+ DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT);
+ u8 l = dp_link_status(link_status, i);
+
+ return ((l >> s) & 0x3) << DP_TRAIN_VOLTAGE_SWING_SHIFT;
+}
+
+static u8 dp_get_adjust_request_pre_emphasis(uint8_t link_status[DP_LINK_STATUS_SIZE],
+ int lane)
+{
+ int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
+ int s = ((lane & 1) ?
+ DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT :
+ DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT);
+ u8 l = dp_link_status(link_status, i);
+
+ return ((l >> s) & 0x3) << DP_TRAIN_PRE_EMPHASIS_SHIFT;
+}
+
+/* XXX fix me -- chip specific */
+#define DP_VOLTAGE_MAX DP_TRAIN_VOLTAGE_SWING_1200
+static u8 dp_pre_emphasis_max(u8 voltage_swing)
+{
+ switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) {
+ case DP_TRAIN_VOLTAGE_SWING_400:
+ return DP_TRAIN_PRE_EMPHASIS_6;
+ case DP_TRAIN_VOLTAGE_SWING_600:
+ return DP_TRAIN_PRE_EMPHASIS_6;
+ case DP_TRAIN_VOLTAGE_SWING_800:
+ return DP_TRAIN_PRE_EMPHASIS_3_5;
+ case DP_TRAIN_VOLTAGE_SWING_1200:
+ default:
+ return DP_TRAIN_PRE_EMPHASIS_0;
+ }
+}
+
+static void dp_get_adjust_train(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 = dp_get_adjust_request_voltage(link_status, lane);
+ u8 this_p = dp_get_adjust_request_pre_emphasis(link_status, lane);
+
+ DRM_DEBUG("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_VOLTAGE_MAX | DP_TRAIN_MAX_SWING_REACHED;
+
+ if (p >= dp_pre_emphasis_max(v))
+ p = dp_pre_emphasis_max(v) | DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
+
+ DRM_DEBUG("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;
+}
+
+
+/* radeon aux chan functions */
+bool radeon_process_aux_ch(struct radeon_i2c_chan *chan, u8 *req_bytes,
+ int num_bytes, u8 *read_byte,
+ u8 read_buf_len, u8 delay)
+{
+ struct drm_device *dev = chan->dev;
+ struct radeon_device *rdev = dev->dev_private;
+ PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION args;
+ int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction);
+ unsigned char *base;
+
+ memset(&args, 0, sizeof(args));
+
+ base = (unsigned char *)rdev->mode_info.atom_context->scratch;
+
+ memcpy(base, req_bytes, num_bytes);
+
+ args.lpAuxRequest = 0;
+ args.lpDataOut = 16;
+ args.ucDataOutLen = 0;
+ args.ucChannelID = chan->rec.i2c_id;
+ args.ucDelay = delay / 10;
+
+ atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
+
+ if (args.ucReplyStatus) {
+ DRM_DEBUG("failed to get auxch %02x%02x %02x %02x 0x%02x %02x\n",
+ req_bytes[1], req_bytes[0], req_bytes[2], req_bytes[3],
+ chan->rec.i2c_id, args.ucReplyStatus);
+ return false;
+ }
+
+ if (args.ucDataOutLen && read_byte && read_buf_len) {
+ if (read_buf_len < args.ucDataOutLen) {
+ DRM_ERROR("Buffer to small for return answer %d %d\n",
+ read_buf_len, args.ucDataOutLen);
+ return false;
+ }
+ {
+ int len = min(read_buf_len, args.ucDataOutLen);
+ memcpy(read_byte, base + 16, len);
+ }
+ }
+ return true;
+}
+
+bool radeon_dp_aux_native_write(struct radeon_connector *radeon_connector, uint16_t address,
+ uint8_t send_bytes, uint8_t *send)
+{
+ struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
+ u8 msg[20];
+ u8 msg_len, dp_msg_len;
+ bool ret;
+
+ dp_msg_len = 4;
+ msg[0] = address;
+ msg[1] = address >> 8;
+ msg[2] = AUX_NATIVE_WRITE << 4;
+ dp_msg_len += send_bytes;
+ msg[3] = (dp_msg_len << 4) | (send_bytes - 1);
+
+ if (send_bytes > 16)
+ return false;
+
+ memcpy(&msg[4], send, send_bytes);
+ msg_len = 4 + send_bytes;
+ ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus, msg, msg_len, NULL, 0, 0);
+ return ret;
+}
+
+bool radeon_dp_aux_native_read(struct radeon_connector *radeon_connector, uint16_t address,
+ uint8_t delay, uint8_t expected_bytes,
+ uint8_t *read_p)
+{
+ struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
+ u8 msg[20];
+ u8 msg_len, dp_msg_len;
+ bool ret = false;
+ msg_len = 4;
+ dp_msg_len = 4;
+ msg[0] = address;
+ msg[1] = address >> 8;
+ msg[2] = AUX_NATIVE_READ << 4;
+ msg[3] = (dp_msg_len) << 4;
+ msg[3] |= expected_bytes - 1;
+
+ ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus, msg, msg_len, read_p, expected_bytes, delay);
+ return ret;
+}
+
+/* radeon dp functions */
+static u8 radeon_dp_encoder_service(struct radeon_device *rdev, int action, int dp_clock,
+ uint8_t ucconfig, uint8_t 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 radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
+ 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,
+ dig_connector->dp_i2c_bus->rec.i2c_id, 0);
+}
+
+bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector)
+{
+ struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
+ u8 msg[25];
+ int ret;
+
+ ret = radeon_dp_aux_native_read(radeon_connector, DP_DPCD_REV, 0, 8, msg);
+ if (ret) {
+ memcpy(dig_connector->dpcd, msg, 8);
+ {
+ int i;
+ DRM_DEBUG("DPCD: ");
+ for (i = 0; i < 8; i++)
+ DRM_DEBUG("%02x ", msg[i]);
+ DRM_DEBUG("\n");
+ }
+ return true;
+ }
+ dig_connector->dpcd[0] = 0;
+ return false;
+}
+
+void radeon_dp_set_link_config(struct drm_connector *connector,
+ struct drm_display_mode *mode)
+{
+ struct radeon_connector *radeon_connector;
+ struct radeon_connector_atom_dig *dig_connector;
+
+ if (connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort)
+ return;
+
+ radeon_connector = to_radeon_connector(connector);
+ if (!radeon_connector->con_priv)
+ return;
+ dig_connector = radeon_connector->con_priv;
+
+ dig_connector->dp_clock =
+ dp_link_clock_for_mode_clock(dig_connector->dpcd, mode->clock);
+ dig_connector->dp_lane_count =
+ dp_lanes_for_mode_clock(dig_connector->dpcd, mode->clock);
+}
+
+int radeon_dp_mode_valid_helper(struct radeon_connector *radeon_connector,
+ struct drm_display_mode *mode)
+{
+ struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
+
+ return dp_mode_valid(dig_connector->dpcd, mode->clock);
+}
+
+static bool atom_dp_get_link_status(struct radeon_connector *radeon_connector,
+ u8 link_status[DP_LINK_STATUS_SIZE])
+{
+ int ret;
+ ret = radeon_dp_aux_native_read(radeon_connector, DP_LANE0_1_STATUS, 100,
+ DP_LINK_STATUS_SIZE, link_status);
+ if (!ret) {
+ DRM_ERROR("displayport link status failed\n");
+ return false;
+ }
+
+ DRM_DEBUG("link status %02x %02x %02x %02x %02x %02x\n",
+ link_status[0], link_status[1], link_status[2],
+ link_status[3], link_status[4], link_status[5]);
+ return true;
+}
+
+bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector)
+{
+ struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
+ u8 link_status[DP_LINK_STATUS_SIZE];
+
+ if (!atom_dp_get_link_status(radeon_connector, link_status))
+ return false;
+ if (dp_channel_eq_ok(link_status, dig_connector->dp_lane_count))
+ return false;
+ return true;
+}
+
+static void dp_set_power(struct radeon_connector *radeon_connector, u8 power_state)
+{
+ struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
+
+ if (dig_connector->dpcd[0] >= 0x11) {
+ radeon_dp_aux_native_write(radeon_connector, DP_SET_POWER, 1,
+ &power_state);
+ }
+}
+
+static void dp_set_downspread(struct radeon_connector *radeon_connector, u8 downspread)
+{
+ radeon_dp_aux_native_write(radeon_connector, DP_DOWNSPREAD_CTRL, 1,
+ &downspread);
+}
+
+static void dp_set_link_bw_lanes(struct radeon_connector *radeon_connector,
+ u8 link_configuration[DP_LINK_CONFIGURATION_SIZE])
+{
+ radeon_dp_aux_native_write(radeon_connector, DP_LINK_BW_SET, 2,
+ link_configuration);
+}
+
+static void dp_update_dpvs_emph(struct radeon_connector *radeon_connector,
+ struct drm_encoder *encoder,
+ u8 train_set[4])
+{
+ struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
+ int i;
+
+ for (i = 0; i < dig_connector->dp_lane_count; i++)
+ atombios_dig_transmitter_setup(encoder,
+ ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH,
+ i, train_set[i]);
+
+ radeon_dp_aux_native_write(radeon_connector, DP_TRAINING_LANE0_SET,
+ dig_connector->dp_lane_count, train_set);
+}
+
+static void dp_set_training(struct radeon_connector *radeon_connector,
+ u8 training)
+{
+ radeon_dp_aux_native_write(radeon_connector, DP_TRAINING_PATTERN_SET,
+ 1, &training);
+}
+
+void 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;
+ int enc_id = 0;
+ bool clock_recovery, channel_eq;
+ u8 link_status[DP_LINK_STATUS_SIZE];
+ u8 link_configuration[DP_LINK_CONFIGURATION_SIZE];
+ u8 tries, voltage;
+ u8 train_set[4];
+ int i;
+
+ if (connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort)
+ return;
+
+ 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 (ASIC_IS_DCE32(rdev)) {
+ if (dig->dig_block)
+ enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER;
+ else
+ enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER;
+ if (dig_connector->linkb)
+ enc_id |= ATOM_DP_CONFIG_LINK_B;
+ else
+ enc_id |= ATOM_DP_CONFIG_LINK_A;
+ } else {
+ if (dig_connector->linkb)
+ enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER | ATOM_DP_CONFIG_LINK_B;
+ else
+ enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER | ATOM_DP_CONFIG_LINK_A;
+ }
+
+ memset(link_configuration, 0, DP_LINK_CONFIGURATION_SIZE);
+ if (dig_connector->dp_clock == 270000)
+ link_configuration[0] = DP_LINK_BW_2_7;
+ else
+ link_configuration[0] = DP_LINK_BW_1_62;
+ link_configuration[1] = dig_connector->dp_lane_count;
+ if (dig_connector->dpcd[0] >= 0x11)
+ link_configuration[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
+
+ /* power up the sink */
+ dp_set_power(radeon_connector, DP_SET_POWER_D0);
+ /* disable the training pattern on the sink */
+ dp_set_training(radeon_connector, DP_TRAINING_PATTERN_DISABLE);
+ /* set link bw and lanes on the sink */
+ dp_set_link_bw_lanes(radeon_connector, link_configuration);
+ /* disable downspread on the sink */
+ dp_set_downspread(radeon_connector, 0);
+ /* start training on the source */
+ radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_TRAINING_START,
+ dig_connector->dp_clock, enc_id, 0);
+ /* set training pattern 1 on the source */
+ radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
+ dig_connector->dp_clock, enc_id, 0);
+
+ /* set initial vs/emph */
+ memset(train_set, 0, 4);
+ udelay(400);
+ /* set training pattern 1 on the sink */
+ dp_set_training(radeon_connector, DP_TRAINING_PATTERN_1);
+
+ dp_update_dpvs_emph(radeon_connector, encoder, train_set);
+
+ /* clock recovery loop */
+ clock_recovery = false;
+ tries = 0;
+ voltage = 0xff;
+ for (;;) {
+ udelay(100);
+ if (!atom_dp_get_link_status(radeon_connector, link_status))
+ break;
+
+ if (dp_clock_recovery_ok(link_status, dig_connector->dp_lane_count)) {
+ clock_recovery = true;
+ break;
+ }
+
+ for (i = 0; i < dig_connector->dp_lane_count; i++) {
+ if ((train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
+ break;
+ }
+ if (i == dig_connector->dp_lane_count) {
+ DRM_ERROR("clock recovery reached max voltage\n");
+ break;
+ }
+
+ if ((train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
+ ++tries;
+ if (tries == 5) {
+ DRM_ERROR("clock recovery tried 5 times\n");
+ break;
+ }
+ } else
+ tries = 0;
+
+ voltage = train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
+
+ /* Compute new train_set as requested by sink */
+ dp_get_adjust_train(link_status, dig_connector->dp_lane_count, train_set);
+ dp_update_dpvs_emph(radeon_connector, encoder, train_set);
+ }
+ if (!clock_recovery)
+ DRM_ERROR("clock recovery failed\n");
+ else
+ DRM_DEBUG("clock recovery at voltage %d pre-emphasis %d\n",
+ train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
+ (train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >>
+ DP_TRAIN_PRE_EMPHASIS_SHIFT);
+
+
+ /* set training pattern 2 on the sink */
+ dp_set_training(radeon_connector, DP_TRAINING_PATTERN_2);
+ /* set training pattern 2 on the source */
+ radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
+ dig_connector->dp_clock, enc_id, 1);
+
+ /* channel equalization loop */
+ tries = 0;
+ channel_eq = false;
+ for (;;) {
+ udelay(400);
+ if (!atom_dp_get_link_status(radeon_connector, link_status))
+ break;
+
+ if (dp_channel_eq_ok(link_status, dig_connector->dp_lane_count)) {
+ channel_eq = true;
+ break;
+ }
+
+ /* Try 5 times */
+ if (tries > 5) {
+ DRM_ERROR("channel eq failed: 5 tries\n");
+ break;
+ }
+
+ /* Compute new train_set as requested by sink */
+ dp_get_adjust_train(link_status, dig_connector->dp_lane_count, train_set);
+ dp_update_dpvs_emph(radeon_connector, encoder, train_set);
+
+ tries++;
+ }
+
+ if (!channel_eq)
+ DRM_ERROR("channel eq failed\n");
+ else
+ DRM_DEBUG("channel eq at voltage %d pre-emphasis %d\n",
+ train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
+ (train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK)
+ >> DP_TRAIN_PRE_EMPHASIS_SHIFT);
+
+ /* disable the training pattern on the sink */
+ dp_set_training(radeon_connector, DP_TRAINING_PATTERN_DISABLE);
+
+ radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_TRAINING_COMPLETE,
+ dig_connector->dp_clock, enc_id, 0);
+}
+
+int radeon_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode,
+ uint8_t write_byte, uint8_t *read_byte)
+{
+ struct i2c_algo_dp_aux_data *algo_data = adapter->algo_data;
+ struct radeon_i2c_chan *auxch = (struct radeon_i2c_chan *)adapter;
+ int ret = 0;
+ uint16_t address = algo_data->address;
+ uint8_t msg[5];
+ uint8_t reply[2];
+ int msg_len, dp_msg_len;
+ int reply_bytes;
+
+ /* Set up the command byte */
+ if (mode & MODE_I2C_READ)
+ msg[2] = AUX_I2C_READ << 4;
+ else
+ msg[2] = AUX_I2C_WRITE << 4;
+
+ if (!(mode & MODE_I2C_STOP))
+ msg[2] |= AUX_I2C_MOT << 4;
+
+ msg[0] = address;
+ msg[1] = address >> 8;
+
+ reply_bytes = 1;
+
+ msg_len = 4;
+ dp_msg_len = 3;
+ switch (mode) {
+ case MODE_I2C_WRITE:
+ msg[4] = write_byte;
+ msg_len++;
+ dp_msg_len += 2;
+ break;
+ case MODE_I2C_READ:
+ dp_msg_len += 1;
+ break;
+ default:
+ break;
+ }
+
+ msg[3] = (dp_msg_len) << 4;
+ ret = radeon_process_aux_ch(auxch, msg, msg_len, reply, reply_bytes, 0);
+
+ if (ret) {
+ if (read_byte)
+ *read_byte = reply[0];
+ return reply_bytes;
+ }
+ return -EREMOTEIO;
+}
+
generated by cgit v1.2.3 (git 2.39.0) at 2025-01-02 07:22:43 +0300