+
+ int rate = drm_dp_bw_code_to_link_rate(dp->link.rate);
+ u8 swing = (dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) >>
+ DP_TRAIN_VOLTAGE_SWING_SHIFT;
+ u8 pre_emphasis = (dp->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK)
+ >> DP_TRAIN_PRE_EMPHASIS_SHIFT;
+
+ tcphy->typec_phy_config(port->phy, rate, dp->link.num_lanes,
+ swing, pre_emphasis);
+}
+
+static int cdn_dp_set_pattern(struct cdn_dp_device *dp, uint8_t dp_train_pat)
+{
+ u32 phy_config, global_config;
+ int ret;
+ uint8_t pattern = dp_train_pat & DP_TRAINING_PATTERN_MASK;
+
+ global_config = NUM_LANES(dp->link.num_lanes - 1) | SST_MODE |
+ GLOBAL_EN | RG_EN | ENC_RST_DIS | WR_VHSYNC_FALL;
+
+ phy_config = DP_TX_PHY_ENCODER_BYPASS(0) |
+ DP_TX_PHY_SKEW_BYPASS(0) |
+ DP_TX_PHY_DISPARITY_RST(0) |
+ DP_TX_PHY_LANE0_SKEW(0) |
+ DP_TX_PHY_LANE1_SKEW(1) |
+ DP_TX_PHY_LANE2_SKEW(2) |
+ DP_TX_PHY_LANE3_SKEW(3) |
+ DP_TX_PHY_10BIT_ENABLE(0);
+
+ if (pattern != DP_TRAINING_PATTERN_DISABLE) {
+ global_config |= NO_VIDEO;
+ phy_config |= DP_TX_PHY_TRAINING_ENABLE(1) |
+ DP_TX_PHY_SCRAMBLER_BYPASS(1) |
+ DP_TX_PHY_TRAINING_PATTERN(pattern);
+ }
+
+ ret = cdn_dp_reg_write(dp, DP_FRAMER_GLOBAL_CONFIG, global_config);
+ if (ret) {
+ DRM_ERROR("fail to set DP_FRAMER_GLOBAL_CONFIG, error: %d\n",
+ ret);
+ return ret;
+ }
+
+ ret = cdn_dp_reg_write(dp, DP_TX_PHY_CONFIG_REG, phy_config);
+ if (ret) {
+ DRM_ERROR("fail to set DP_TX_PHY_CONFIG_REG, error: %d\n",
+ ret);
+ return ret;
+ }
+
+ ret = cdn_dp_reg_write(dp, DPTX_LANE_EN, BIT(dp->link.num_lanes) - 1);
+ if (ret) {
+ DRM_ERROR("fail to set DPTX_LANE_EN, error: %d\n", ret);
+ return ret;
+ }
+
+ if (drm_dp_enhanced_frame_cap(dp->dpcd))
+ ret = cdn_dp_reg_write(dp, DPTX_ENHNCD, 1);
+ else
+ ret = cdn_dp_reg_write(dp, DPTX_ENHNCD, 0);
+ if (ret)
+ DRM_ERROR("failed to set DPTX_ENHNCD, error: %x\n", ret);
+
+ return ret;
+}
+
+static u8 cdn_dp_pre_emphasis_max(u8 voltage_swing)
+{
+ switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) {
+ case DP_TRAIN_VOLTAGE_SWING_LEVEL_0:
+ return DP_TRAIN_PRE_EMPH_LEVEL_3;
+ case DP_TRAIN_VOLTAGE_SWING_LEVEL_1:
+ return DP_TRAIN_PRE_EMPH_LEVEL_2;
+ case DP_TRAIN_VOLTAGE_SWING_LEVEL_2:
+ return DP_TRAIN_PRE_EMPH_LEVEL_1;
+ default:
+ return DP_TRAIN_PRE_EMPH_LEVEL_0;
+ }
+}
+
+static void cdn_dp_get_adjust_train(struct cdn_dp_device *dp,
+ uint8_t link_status[DP_LINK_STATUS_SIZE])
+{
+ int i;
+ uint8_t v = 0, p = 0;
+ uint8_t preemph_max;
+
+ for (i = 0; i < dp->link.num_lanes; i++) {
+ v = max(v, drm_dp_get_adjust_request_voltage(link_status, i));
+ p = max(p, drm_dp_get_adjust_request_pre_emphasis(link_status,
+ i));
+ }
+
+ if (v >= VOLTAGE_LEVEL_2)
+ v = VOLTAGE_LEVEL_2 | DP_TRAIN_MAX_SWING_REACHED;
+
+ preemph_max = cdn_dp_pre_emphasis_max(v);
+ if (p >= preemph_max)
+ p = preemph_max | DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
+
+ for (i = 0; i < dp->link.num_lanes; i++)
+ dp->train_set[i] = v | p;
+}
+
+/*
+ * Pick training pattern for channel equalization. Training Pattern 3 for HBR2
+ * or 1.2 devices that support it, Training Pattern 2 otherwise.
+ */
+static u32 cdn_dp_select_chaneq_pattern(struct cdn_dp_device *dp)
+{
+ u32 training_pattern = DP_TRAINING_PATTERN_2;
+
+ /*
+ * cdn dp support HBR2 also support TPS3. TPS3 support is also mandatory
+ * for downstream devices that support HBR2. However, not all sinks
+ * follow the spec.
+ */
+ if (drm_dp_tps3_supported(dp->dpcd))
+ training_pattern = DP_TRAINING_PATTERN_3;
+ else
+ DRM_DEBUG_KMS("5.4 Gbps link rate without sink TPS3 support\n");
+
+ return training_pattern;
+}
+
+
+static bool cdn_dp_link_max_vswing_reached(struct cdn_dp_device *dp)
+{
+ int lane;
+
+ for (lane = 0; lane < dp->link.num_lanes; lane++)
+ if ((dp->train_set[lane] & DP_TRAIN_MAX_SWING_REACHED) == 0)
+ return false;
+
+ return true;
+}
+
+static int cdn_dp_update_link_train(struct cdn_dp_device *dp)
+{
+ int ret;
+
+ cdn_dp_set_signal_levels(dp);
+
+ ret = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET,
+ dp->train_set, dp->link.num_lanes);
+ if (ret != dp->link.num_lanes)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int cdn_dp_set_link_train(struct cdn_dp_device *dp,
+ uint8_t dp_train_pat)
+{
+ uint8_t buf[sizeof(dp->train_set) + 1];
+ int ret, len;
+
+ buf[0] = dp_train_pat;
+ if ((dp_train_pat & DP_TRAINING_PATTERN_MASK) ==
+ DP_TRAINING_PATTERN_DISABLE) {
+ /* don't write DP_TRAINING_LANEx_SET on disable */
+ len = 1;
+ } else {
+ /* DP_TRAINING_LANEx_SET follow DP_TRAINING_PATTERN_SET */
+ memcpy(buf + 1, dp->train_set, dp->link.num_lanes);
+ len = dp->link.num_lanes + 1;
+ }
+
+ ret = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_PATTERN_SET,
+ buf, len);
+ if (ret != len)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int cdn_dp_reset_link_train(struct cdn_dp_device *dp,
+ uint8_t dp_train_pat)
+{
+ int ret;
+
+ memset(dp->train_set, 0, sizeof(dp->train_set));
+
+ cdn_dp_set_signal_levels(dp);
+
+ ret = cdn_dp_set_pattern(dp, dp_train_pat);
+ if (ret)
+ return ret;
+
+ return cdn_dp_set_link_train(dp, dp_train_pat);
+}
+
+/* Enable corresponding port and start training pattern 1 */
+static int cdn_dp_link_training_clock_recovery(struct cdn_dp_device *dp)
+{
+ u8 voltage;
+ u8 link_status[DP_LINK_STATUS_SIZE];
+ u32 voltage_tries, max_vswing_tries;
+ int ret;
+
+ /* clock recovery */
+ ret = cdn_dp_reset_link_train(dp, DP_TRAINING_PATTERN_1 |
+ DP_LINK_SCRAMBLING_DISABLE);
+ if (ret) {
+ DRM_ERROR("failed to start link train\n");
+ return ret;
+ }
+
+ voltage_tries = 1;
+ max_vswing_tries = 0;
+ for (;;) {
+ drm_dp_link_train_clock_recovery_delay(dp->dpcd);
+ if (drm_dp_dpcd_read_link_status(&dp->aux, link_status) !=
+ DP_LINK_STATUS_SIZE) {
+ DRM_ERROR("failed to get link status\n");
+ return -EINVAL;
+ }
+
+ if (drm_dp_clock_recovery_ok(link_status, dp->link.num_lanes)) {
+ DRM_DEBUG_KMS("clock recovery OK\n");
+ return 0;
+ }
+
+ if (voltage_tries >= 5) {
+ DRM_DEBUG_KMS("Same voltage tried 5 times\n");
+ return -EINVAL;
+ }
+
+ if (max_vswing_tries >= 1) {
+ DRM_DEBUG_KMS("Max Voltage Swing reached\n");
+ return -EINVAL;
+ }
+
+ voltage = dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
+
+ /* Update training set as requested by target */
+ cdn_dp_get_adjust_train(dp, link_status);
+ if (cdn_dp_update_link_train(dp)) {
+ DRM_ERROR("failed to update link training\n");
+ return -EINVAL;
+ }
+
+ if ((dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) ==
+ voltage)
+ ++voltage_tries;
+ else
+ voltage_tries = 1;
+
+ if (cdn_dp_link_max_vswing_reached(dp))
+ ++max_vswing_tries;
+ }
+}
+
+static int cdn_dp_link_training_channel_equalization(struct cdn_dp_device *dp)
+{
+ int tries, ret;
+ u32 training_pattern;
+ uint8_t link_status[DP_LINK_STATUS_SIZE];
+
+ training_pattern = cdn_dp_select_chaneq_pattern(dp);
+ training_pattern |= DP_LINK_SCRAMBLING_DISABLE;
+
+ ret = cdn_dp_set_pattern(dp, training_pattern);
+ if (ret)
+ return ret;
+
+ ret = cdn_dp_set_link_train(dp, training_pattern);
+ if (ret) {
+ DRM_ERROR("failed to start channel equalization\n");
+ return ret;
+ }
+
+ for (tries = 0; tries < 5; tries++) {
+ drm_dp_link_train_channel_eq_delay(dp->dpcd);
+ if (drm_dp_dpcd_read_link_status(&dp->aux, link_status) !=
+ DP_LINK_STATUS_SIZE) {
+ DRM_ERROR("failed to get link status\n");
+ break;
+ }
+
+ /* Make sure clock is still ok */
+ if (!drm_dp_clock_recovery_ok(link_status,
+ dp->link.num_lanes)) {
+ DRM_DEBUG_KMS("Clock recovery check failed\n");
+ break;
+ }
+
+ if (drm_dp_channel_eq_ok(link_status, dp->link.num_lanes)) {
+ DRM_DEBUG_KMS("Channel EQ done\n");
+ return 0;
+ }
+
+ /* Update training set as requested by target */
+ cdn_dp_get_adjust_train(dp, link_status);
+ if (cdn_dp_update_link_train(dp)) {
+ DRM_ERROR("failed to update link training\n");
+ break;
+ }
+ }
+
+ /* Try 5 times, else fail and try at lower BW */
+ if (tries == 5)
+ DRM_DEBUG_KMS("Channel equalization failed 5 times\n");
+
+ return -EINVAL;
+}
+
+static int cdn_dp_stop_link_train(struct cdn_dp_device *dp)
+{
+ int ret = cdn_dp_set_pattern(dp, DP_TRAINING_PATTERN_DISABLE);
+
+ if (ret)
+ return ret;
+
+ return cdn_dp_set_link_train(dp, DP_TRAINING_PATTERN_DISABLE);
+}
+
+static int cdn_dp_get_lower_link_rate(struct cdn_dp_device *dp)
+{
+ switch (dp->link.rate) {
+ case DP_LINK_BW_1_62:
+ return -EINVAL;
+ case DP_LINK_BW_2_7:
+ dp->link.rate = DP_LINK_BW_1_62;
+ break;
+ case DP_LINK_BW_5_4:
+ dp->link.rate = DP_LINK_BW_2_7;
+ break;
+ default:
+ dp->link.rate = DP_LINK_BW_5_4;
+ break;
+ }
+
+ return 0;
+}
+
+int cdn_dp_software_train_link(struct cdn_dp_device *dp)
+{
+ int ret, stop_err;
+ u8 link_config[2];
+ u32 rate, sink_max, source_max;
+
+ ret = drm_dp_dpcd_read(&dp->aux, DP_DPCD_REV, dp->dpcd,
+ sizeof(dp->dpcd));
+ if (ret < 0) {
+ DRM_DEV_ERROR(dp->dev, "Failed to get caps %d\n", ret);
+ return ret;
+ }
+
+ source_max = dp->lanes;
+ sink_max = drm_dp_max_lane_count(dp->dpcd);
+ dp->link.num_lanes = min(source_max, sink_max);
+
+ source_max = drm_dp_bw_code_to_link_rate(CDN_DP_MAX_LINK_RATE);
+ sink_max = drm_dp_max_link_rate(dp->dpcd);
+ rate = min(source_max, sink_max);
+ dp->link.rate = drm_dp_link_rate_to_bw_code(rate);
+
+ link_config[0] = 0;
+ link_config[1] = 0;
+ if (dp->dpcd[DP_MAIN_LINK_CHANNEL_CODING] & 0x01)
+ link_config[1] = DP_SET_ANSI_8B10B;
+ drm_dp_dpcd_write(&dp->aux, DP_DOWNSPREAD_CTRL, link_config, 2);
+
+ while (true) {
+
+ /* Write the link configuration data */
+ link_config[0] = dp->link.rate;
+ link_config[1] = dp->link.num_lanes;
+ if (drm_dp_enhanced_frame_cap(dp->dpcd))
+ link_config[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
+ drm_dp_dpcd_write(&dp->aux, DP_LINK_BW_SET, link_config, 2);
+
+ ret = cdn_dp_link_training_clock_recovery(dp);
+ if (ret) {
+ if (!cdn_dp_get_lower_link_rate(dp))
+ continue;
+
+ DRM_ERROR("training clock recovery failed: %d\n", ret);
+ break;
+ }
+
+ ret = cdn_dp_link_training_channel_equalization(dp);
+ if (ret) {
+ if (!cdn_dp_get_lower_link_rate(dp))
+ continue;
+
+ DRM_ERROR("training channel eq failed: %d\n", ret);
+ break;
+ }
+
+ break;
+ }
+
+ stop_err = cdn_dp_stop_link_train(dp);
+ if (stop_err) {
+ DRM_ERROR("stop training fail, error: %d\n", stop_err);
+ return stop_err;
+ }
+
+ return ret;
+}
diff --git a/drivers/gpu/drm/rockchip/cdn-dp-reg.c b/drivers/gpu/drm/rockchip/cdn-dp-reg.c
index 979355d..e1273e6 100644
--- a/drivers/gpu/drm/rockchip/cdn-dp-reg.c
+++ b/drivers/gpu/drm/rockchip/cdn-dp-reg.c
@@ -17,7 +17,9 @@
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/iopoll.h>
+#include <linux/phy/phy.h>
#include <linux/reset.h>
+#include <soc/rockchip/rockchip_phy_typec.h>
#include "cdn-dp-core.h"
#include "cdn-dp-reg.h"
@@ -189,7 +191,7 @@ static int cdn_dp_mailbox_send(struct cdn_dp_device *dp, u8 module_id,
return 0;
}
-static int cdn_dp_reg_write(struct cdn_dp_device *dp, u16 addr, u32 val)
+int cdn_dp_reg_write(struct cdn_dp_device *dp, u16 addr, u32 val)
{
u8 msg[6];
@@ -609,6 +611,31 @@ int cdn_dp_train_link(struct cdn_dp_device *dp)
{
int ret;
+ /*
+ * DP firmware uses fixed phy config values to do training, but some
+ * boards need to adjust these values to fit for their unique hardware
+ * design. So if the phy is using custom config values, do software
+ * link training instead of relying on firmware, if software training
+ * fail, keep firmware training as a fallback if sw training fails.
+ */
+ ret = cdn_dp_software_train_link(dp);
+ if (ret) {
+ DRM_DEV_ERROR(dp->dev,
+ "Failed to do software training %d\n", ret);
+ goto do_fw_training;
+ }
+ ret = cdn_dp_reg_write(dp, SOURCE_HDTX_CAR, 0xf);
+ if (ret) {
+ DRM_DEV_ERROR(dp->dev,
+ "Failed to write SOURCE_HDTX_CAR register %d\n", ret);
+ goto do_fw_training;
+ }
+ dp->use_fw_training = false;
+ return 0;
+
+do_fw_training:
+ dp->use_fw_training = true;
+ DRM_DEV_DEBUG_KMS(dp->dev, "use fw training\n");
ret = cdn_dp_training_start(dp);
if (ret) {
DRM_DEV_ERROR(dp->dev, "Failed to start training %d\n", ret);
@@ -623,7 +650,7 @@ int cdn_dp_train_link(struct cdn_dp_device *dp)
DRM_DEV_DEBUG_KMS(dp->dev, "rate:0x%x, lanes:%d\n", dp->link.rate,
dp->link.num_lanes);
- return ret;
+ return 0;
}
int cdn_dp_set_video_status(struct cdn_dp_device *dp, int active)
diff --git a/drivers/gpu/drm/rockchip/cdn-dp-reg.h b/drivers/gpu/drm/rockchip/cdn-dp-reg.h
index 6580b11..3420771 100644
--- a/drivers/gpu/drm/rockchip/cdn-dp-reg.h
+++ b/drivers/gpu/drm/rockchip/cdn-dp-reg.h
@@ -137,7 +137,7 @@
#define HPD_EVENT_MASK 0x211c
#define HPD_EVENT_DET 0x2120
-/* dpyx framer addr */
+/* dptx framer addr */
#define DP_FRAMER_GLOBAL_CONFIG 0x2200
#define DP_SW_RESET 0x2204
#define DP_FRAMER_TU 0x2208
@@ -431,6 +431,40 @@
/* Reference cycles when using lane clock as reference */
#define LANE_REF_CYC 0x8000
+/* register CM_VID_CTRL */
+#define LANE_VID_REF_CYC(x) (((x) & (BIT(24) - 1)) << 0)
+#define NMVID_MEAS_TOLERANCE(x) (((x) & 0xf) << 24)
+
+/* register DP_TX_PHY_CONFIG_REG */
+#define DP_TX_PHY_TRAINING_ENABLE(x) ((x) & 1)
+#define DP_TX_PHY_TRAINING_TYPE_PRBS7 (0 << 1)
+#define DP_TX_PHY_TRAINING_TYPE_TPS1 (1 << 1)
+#define DP_TX_PHY_TRAINING_TYPE_TPS2 (2 << 1)
+#define DP_TX_PHY_TRAINING_TYPE_TPS3 (3 << 1)
+#define DP_TX_PHY_TRAINING_TYPE_TPS4 (4 << 1)
+#define DP_TX_PHY_TRAINING_TYPE_PLTPAT (5 << 1)
+#define DP_TX_PHY_TRAINING_TYPE_D10_2 (6 << 1)
+#define DP_TX_PHY_TRAINING_TYPE_HBR2CPAT (8 << 1)
+#define DP_TX_PHY_TRAINING_PATTERN(x) ((x) << 1)
+#define DP_TX_PHY_SCRAMBLER_BYPASS(x) (((x) & 1) << 5)
+#define DP_TX_PHY_ENCODER_BYPASS(x) (((x) & 1) << 6)
+#define DP_TX_PHY_SKEW_BYPASS(x) (((x) & 1) << 7)
+#define DP_TX_PHY_DISPARITY_RST(x) (((x) & 1) << 8)
+#define DP_TX_PHY_LANE0_SKEW(x) (((x) & 7) << 9)
+#define DP_TX_PHY_LANE1_SKEW(x) (((x) & 7) << 12)
+#define DP_TX_PHY_LANE2_SKEW(x) (((x) & 7) << 15)
+#define DP_TX_PHY_LANE3_SKEW(x) (((x) & 7) << 18)
+#define DP_TX_PHY_10BIT_ENABLE(x) (((x) & 1) << 21)
+
+/* register DP_FRAMER_GLOBAL_CONFIG */
+#define NUM_LANES(x) ((x) & 3)
+#define SST_MODE (0 << 2)
+#define RG_EN (0 << 4)
+#define GLOBAL_EN BIT(3)
+#define NO_VIDEO BIT(5)
+#define ENC_RST_DIS BIT(6)
+#define WR_VHSYNC_FALL BIT(7)
+
enum voltage_swing_level {
VOLTAGE_LEVEL_0,
VOLTAGE_LEVEL_1,
@@ -476,6 +510,7 @@ int cdn_dp_set_host_cap(struct cdn_dp_device *dp, u8 lanes, bool flip);
int cdn_dp_event_config(struct cdn_dp_device *dp);
u32 cdn_dp_get_event(struct cdn_dp_device *dp);
int cdn_dp_get_hpd_status(struct cdn_dp_device *dp);
+int cdn_dp_reg_write(struct cdn_dp_device *dp, u16 addr, u32 val);
ssize_t cdn_dp_dpcd_write(struct cdn_dp_device *dp, u32 addr,
u8 *data, u16 len);
ssize_t cdn_dp_dpcd_read(struct cdn_dp_device *dp, u32 addr,
@@ -489,4 +524,5 @@ int cdn_dp_config_video(struct cdn_dp_device *dp);
int cdn_dp_audio_stop(struct cdn_dp_device *dp, struct audio_info *audio);
int cdn_dp_audio_mute(struct cdn_dp_device *dp, bool enable);
int cdn_dp_audio_config(struct cdn_dp_device *dp, struct audio_info *audio);
+int cdn_dp_software_train_link(struct cdn_dp_device *dp);
#endif /* _CDN_DP_REG_H */
--
2.7.4
