drm/radeon/kms: add support for DP modesetting
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
index 76eb5c8..ebaf3f8 100644
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -31,9 +31,20 @@
#include "atom-bits.h"
#include "drm_dp_helper.h"
-#define DP_LINK_STATUS_SIZE 6
-
/* 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 char *link_train_names[] = {
+ "pattern 1", "pattern 2", "idle", "off"
+};
static const int dp_clocks[] = {
54000, // 1 lane, 1.62 Ghz
@@ -46,9 +57,18 @@
static const int num_dp_clocks = sizeof(dp_clocks) / sizeof(int);
-int dp_lanes_for_mode_clock(int max_link_bw, int mode_clock)
+/* 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:
@@ -56,6 +76,19 @@
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;
@@ -68,6 +101,19 @@
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;
@@ -83,17 +129,56 @@
return 0;
}
-int dp_link_clock_for_mode_clock(int max_link_bw, int mode_clock)
+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:
- return 162000;
+ 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;
}
@@ -102,6 +187,145 @@
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_INFO("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_INFO("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)
@@ -147,6 +371,51 @@
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)
{
@@ -166,76 +435,23 @@
u8 radeon_dp_getsinktype(struct radeon_connector *radeon_connector)
{
- struct radeon_connector_atom_dig *radeon_dig_connector = radeon_connector->con_priv;
+ 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,
- radeon_dig_connector->dp_i2c_bus->rec.i2c_id, 0);
-}
-
-union dig_transmitter_control {
- DIG_TRANSMITTER_CONTROL_PS_ALLOCATION v1;
- DIG_TRANSMITTER_CONTROL_PARAMETERS_V2 v2;
-};
-
-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 *radeon_dig_connector = radeon_connector->con_priv;
- struct drm_device *dev = radeon_connector->base.dev;
- struct radeon_device *rdev = dev->dev_private;
- 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(radeon_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 *radeon_dig_connector = radeon_connector->con_priv;
- struct drm_device *dev = radeon_connector->base.dev;
- struct radeon_device *rdev = dev->dev_private;
- 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(radeon_dig_connector->dp_i2c_bus, msg, msg_len, read_p, expected_bytes, delay);
- return ret;
+ dig_connector->dp_i2c_bus->rec.i2c_id, 0);
}
void radeon_dp_getdpcd(struct radeon_connector *radeon_connector)
{
- struct radeon_connector_atom_dig *radeon_dig_connector = radeon_connector->con_priv;
+ 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(radeon_dig_connector->dpcd, msg, 8);
+ memcpy(dig_connector->dpcd, msg, 8);
{
int i;
printk("DPCD: ");
@@ -244,10 +460,38 @@
printk("\n");
}
}
- radeon_dig_connector->dpcd[0] = 0;
+ dig_connector->dpcd[0] = 0;
return;
}
+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])
{
@@ -267,21 +511,41 @@
static void dp_set_power(struct radeon_connector *radeon_connector, u8 power_state)
{
- struct radeon_connector_atom_dig *radeon_dig_connector = radeon_connector->con_priv;
- if (radeon_dig_connector->dpcd[0] >= 0x11) {
+ 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 *radeon_dig_connector = radeon_connector->con_priv;
+ struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
+ int i;
-// radeon_dp_digtransmitter_setup_vsemph();
+ 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,
- 0/* lc */, train_set);
+ dig_connector->dp_lane_count, train_set);
}
static void dp_set_training(struct radeon_connector *radeon_connector,
@@ -291,6 +555,176 @@
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);
+ dp_update_dpvs_emph(radeon_connector, encoder, train_set);
+ udelay(400);
+ /* set training pattern 1 on the sink */
+ dp_set_training(radeon_connector, DP_TRAINING_PATTERN_1);
+
+ /* 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_INFO("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_INFO("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)
{
@@ -342,3 +776,4 @@
}
return -EREMOTEIO;
}
+