lkml.org 
[lkml]   [2020]   [Mar]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH net-next 8/9] net: phy: add bee algorithm for kr training
Date
Add support for bee equalization algorithm used by kr training:
3-Taps Bit Edge Equalization (BEE) algorithm

Signed-off-by: Florinel Iordache <florinel.iordache@nxp.com>
---
drivers/net/phy/backplane/Kconfig | 11 +
drivers/net/phy/backplane/Makefile | 1 +
drivers/net/phy/backplane/eq_bee.c | 1078 ++++++++++++++++++++++++++++++++++++
3 files changed, 1090 insertions(+)
create mode 100644 drivers/net/phy/backplane/eq_bee.c

diff --git a/drivers/net/phy/backplane/Kconfig b/drivers/net/phy/backplane/Kconfig
index 3e20a78..ee5cf1c 100644
--- a/drivers/net/phy/backplane/Kconfig
+++ b/drivers/net/phy/backplane/Kconfig
@@ -19,6 +19,17 @@ config ETH_BACKPLANE_FIXED
No Equalization algorithm is used to adapt the initial coefficients
initially set by the user.

+config ETH_BACKPLANE_BEE
+ tristate "3-Taps Bit Edge Equalization (BEE) algorithm"
+ depends on ETH_BACKPLANE
+ help
+ This module provides a driver for BEE algorithm: 3-Taps
+ Bit Edge Equalization. This algorithm is using a method
+ based on 3-taps coefficients for mitigating intersymbol
+ interference (ISI) in high-speed backplane applications.
+ The initial values for algorithm coefficient values are
+ user configurable and used as a starting point of the algorithm.
+
config ETH_BACKPLANE_QORIQ
tristate "QorIQ Ethernet Backplane driver"
depends on ETH_BACKPLANE
diff --git a/drivers/net/phy/backplane/Makefile b/drivers/net/phy/backplane/Makefile
index d8f95ac..242e938 100644
--- a/drivers/net/phy/backplane/Makefile
+++ b/drivers/net/phy/backplane/Makefile
@@ -5,6 +5,7 @@

obj-$(CONFIG_ETH_BACKPLANE) += eth_backplane.o
obj-$(CONFIG_ETH_BACKPLANE_FIXED) += eq_fixed.o
+obj-$(CONFIG_ETH_BACKPLANE_BEE) += eq_bee.o
obj-$(CONFIG_ETH_BACKPLANE_QORIQ) += eth_backplane_qoriq.o

eth_backplane-objs := backplane.o link_training.o
diff --git a/drivers/net/phy/backplane/eq_bee.c b/drivers/net/phy/backplane/eq_bee.c
new file mode 100644
index 0000000..f62b777
--- /dev/null
+++ b/drivers/net/phy/backplane/eq_bee.c
@@ -0,0 +1,1078 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
+/* 3-Taps Bit Edge Equalization (BEE) algorithm
+ *
+ * Copyright 2019-2020 NXP
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include "equalization.h"
+
+#define ALGORITHM_NAME "backplane_bee_3tap"
+#define ALGORITHM_DESCR "3-Taps Bit Edge Equalization"
+#define ALGORITHM_VERSION "1.5.5"
+
+/* BEE algorithm timeouts */
+#define TIMEOUT_LONG 3
+#define TIMEOUT_M1 3
+
+/* Size of equalization snapshots data collection */
+#define EQ_SNAPSHOTS_SIZE 10
+
+/* Rx link quality conditions:
+ * The following macros are used to determine the Rx link quality
+ * which is used to decide if/when to proceed with BinLong/BinM1 modules.
+ * The code that considers Rx in good quality is always in place:
+ * Rx link is in 'good quality' if:
+ * Bin1, Bin2 and Bin3 are toggling
+ *
+ * These macros are used to enable less quality link conditions.
+ * If Rx link quality is considered good enough then proceed to BinLong/BinM1
+ */
+
+/* Rx is 'less quality' if:
+ * Bin1 is toggling
+ * AND
+ * Bin2 is Early, GainMF stuck at max_eq_gain and Bin3 is Late
+ * OR
+ * Bin2 is Late, GainMF stuck at min_eq_gain and Bin3 is Early
+ */
+#define ENABLE_LESS_QUALITY_CONDITION
+
+/* Rx is 'even less quality' if:
+ * Bin1 is Early AND GainHF stuck at max_eq_gain and Bin2 is Late AND
+ * GainMF stuck at min_eq_gain
+ * OR
+ * Bin1 is Late AND GainHF stuck at min_eq_gain AND
+ * Bin2 is Early, GainMF stuck at max_eq_gain
+ */
+#define ENABLE_EVEN_LESS_QUALITY_CONDITION
+
+/* Rx is 'seemingly quality' if:
+ * Bin1 is always Late for all snapshots AND
+ * GainHF is stuck at min_eq_gain
+ * AND
+ * Bin2 and Bin3 are both Toggling
+ */
+#define ENABLE_SEEMINGLY_QUALITY_CONDITION
+
+enum bin_state {
+ BIN_INVALID,
+ BIN_EARLY,
+ BIN_TOGGLE,
+ BIN_LATE
+};
+
+struct eq_data_priv {
+ /* Equalization Algorithm setup data */
+ struct eq_setup_info eq_setup;
+
+ /* Bin state */
+ enum bin_state bin_m1_state;
+ enum bin_state bin_long_state;
+ enum bin_state prev_bin_m1_state;
+ enum bin_state prev_bin_long_state;
+
+ /* Bin training status */
+ bool bin_m1_stop;
+ bool bin_long_stop;
+ int m1_min_max_cnt;
+ int long_min_max_cnt;
+
+ /* Algorithm controlled value */
+ u32 ld_update;
+
+ /* Bit edge statistics: Bin snapshots */
+ s16 bin1_snapshot[EQ_SNAPSHOTS_SIZE];
+ s16 bin2_snapshot[EQ_SNAPSHOTS_SIZE];
+ s16 bin3_snapshot[EQ_SNAPSHOTS_SIZE];
+ s16 bin_long_snapshot[EQ_SNAPSHOTS_SIZE];
+ s16 bin_m1_snapshot[EQ_SNAPSHOTS_SIZE];
+ s16 bin_offset_snapshot[EQ_SNAPSHOTS_SIZE];
+
+ /* Gain snapshots */
+ u8 gain_hf_snapshot[EQ_SNAPSHOTS_SIZE];
+ u8 gain_mf_snapshot[EQ_SNAPSHOTS_SIZE];
+
+ /* Offset status snapshot */
+ u8 osestat_snapshot[EQ_SNAPSHOTS_SIZE];
+};
+
+static enum bin_state get_bin_snapshots_state(struct eq_data_priv *priv,
+ enum eqc_type type)
+{
+ s16 bin_snp_av_thr_low, bin_snp_av_thr_high;
+ s16 snapshot_average, snapshot_sum = 0;
+ s16 *bin_snapshot;
+ struct eqc_range *bin_range;
+ int i;
+
+ if (!priv) {
+ pr_err("%s: NULL private data\n", ALGORITHM_NAME);
+ return BIN_INVALID;
+ }
+
+ switch (type) {
+ case EQC_BIN_1:
+ bin_snapshot = priv->bin1_snapshot;
+ break;
+ case EQC_BIN_2:
+ bin_snapshot = priv->bin2_snapshot;
+ break;
+ case EQC_BIN_3:
+ bin_snapshot = priv->bin3_snapshot;
+ break;
+ case EQC_BIN_LONG:
+ bin_snapshot = priv->bin_long_snapshot;
+ break;
+ case EQC_BIN_OFFSET:
+ bin_snapshot = priv->bin_offset_snapshot;
+ break;
+ case EQC_BIN_M1:
+ bin_snapshot = priv->bin_m1_snapshot;
+ break;
+ default:
+ /* invalid bin type */
+ return BIN_INVALID;
+ }
+ if (!bin_snapshot)
+ return BIN_INVALID;
+
+ bin_range = priv->eq_setup.equalizer.ops.get_counter_range(type);
+ if (!bin_range)
+ return BIN_INVALID;
+
+ bin_snp_av_thr_low = bin_range->mid_low;
+ bin_snp_av_thr_high = bin_range->mid_high;
+
+ for (i = 0; i < EQ_SNAPSHOTS_SIZE; i++)
+ snapshot_sum += bin_snapshot[i];
+
+ snapshot_average = (s16)(snapshot_sum / EQ_SNAPSHOTS_SIZE);
+
+ if (snapshot_average >= -256 && snapshot_average < bin_snp_av_thr_low)
+ return BIN_EARLY;
+ else if (snapshot_average >= bin_snp_av_thr_low &&
+ snapshot_average < bin_snp_av_thr_high)
+ return BIN_TOGGLE;
+ else if (snapshot_average >= bin_snp_av_thr_high &&
+ snapshot_average <= 255)
+ return BIN_LATE;
+
+ return BIN_INVALID;
+}
+
+static u32 process_bin_m1_toggle(struct eq_data_priv *priv)
+{
+ enum req_type prev_req_cm1;
+ u32 update = lt_encode_startup_request(REQ_HOLD);
+
+ if (!priv) {
+ pr_err("%s: NULL private data\n", ALGORITHM_NAME);
+ return update;
+ }
+
+ prev_req_cm1 = lt_decode_coef_update(priv->ld_update, C_M1);
+
+ /* Toggle path */
+ if (priv->prev_bin_m1_state == priv->bin_m1_state) {
+ /* Hold C- */
+ update = lt_encode_startup_request(REQ_HOLD);
+ } else {
+ update = lt_encode_startup_request(REQ_HOLD);
+ /* If previous step moved C- repeat C- move */
+ if (prev_req_cm1 == REQ_INC ||
+ prev_req_cm1 == REQ_DEC)
+ update = lt_encode_request(update, prev_req_cm1, C_M1);
+ }
+
+ return update;
+}
+
+static u32 process_bin_m1_prev_toggle(struct eq_data_priv *priv)
+{
+ enum req_type prev_req_cm1;
+ u32 update = lt_encode_startup_request(REQ_HOLD);
+
+ if (!priv) {
+ pr_err("%s: NULL private data\n", ALGORITHM_NAME);
+ return update;
+ }
+
+ prev_req_cm1 = lt_decode_coef_update(priv->ld_update, C_M1);
+
+ update = lt_encode_startup_request(REQ_HOLD);
+ /* If previous step moved C- go back on C- */
+ if (prev_req_cm1 == REQ_INC)
+ update = lt_encode_request(update, REQ_DEC, C_M1);
+ if (prev_req_cm1 == REQ_DEC)
+ update = lt_encode_request(update, REQ_INC, C_M1);
+
+ return update;
+}
+
+static u32 process_bin_m1_early(struct eq_data_priv *priv)
+{
+ enum coef_status lpst_cm1;
+ u32 update = lt_encode_startup_request(REQ_HOLD);
+
+ if (!priv) {
+ pr_err("%s: NULL private data\n", ALGORITHM_NAME);
+ return update;
+ }
+
+ /* Get LP coefficient status to determine
+ * if coefficient is in range or reached the limit thresholds
+ * IF the coefficient is at MIN/MAX and still want to INC/DEC
+ * THEN do we are done with this module
+ */
+ lpst_cm1 = lt_get_lp_coef_status(priv->eq_setup.krlane, C_M1);
+
+ /* Early path */
+ if (lpst_cm1 == COEF_MAX) {
+ /* Hold C- */
+ update = lt_encode_startup_request(REQ_HOLD);
+ } else {
+ /* request Increment C- */
+ update = lt_encode_request(update, REQ_INC, C_M1);
+ }
+
+ return update;
+}
+
+static u32 process_bin_m1_late(struct eq_data_priv *priv)
+{
+ enum coef_status lpst_cm1;
+ u32 update = lt_encode_startup_request(REQ_HOLD);
+
+ if (!priv) {
+ pr_err("%s: NULL private data\n", ALGORITHM_NAME);
+ return update;
+ }
+
+ /* Get LP coefficient status to determine
+ * if coefficient is in range or reached the limit thresholds
+ * IF the coefficient is at MIN/MAX and still want to INC/DEC
+ * THEN do we are done with this module
+ */
+ lpst_cm1 = lt_get_lp_coef_status(priv->eq_setup.krlane, C_M1);
+
+ /* Late path */
+ if (lpst_cm1 == COEF_MIN) {
+ /* Hold C- */
+ update = lt_encode_startup_request(REQ_HOLD);
+ } else {
+ /* request Decrement C- */
+ update = lt_encode_request(update, REQ_DEC, C_M1);
+ }
+
+ return update;
+}
+
+static u32 process_bin_m1_antipodal(struct eq_data_priv *priv)
+{
+ u32 update = lt_encode_startup_request(REQ_HOLD);
+
+ if (!priv) {
+ pr_err("%s: NULL private data\n", ALGORITHM_NAME);
+ return update;
+ }
+
+ if (priv->bin_m1_state == BIN_LATE) {
+ /* request Decrement C- */
+ update = lt_encode_request(update, REQ_DEC, C_M1);
+ } else {
+ /* Hold C- */
+ update = lt_encode_startup_request(REQ_HOLD);
+ }
+
+ return update;
+}
+
+/* process_bin_m1
+ *
+ * Bin_M1:
+ * contains the scoring of initial edges on pulses that are 1UI long
+ * following non-single bits
+ * used to adjust LP coefficient: C_M1
+ */
+static void process_bin_m1(struct eq_data_priv *priv)
+{
+ u32 update = lt_encode_startup_request(REQ_HOLD);
+
+ if (!priv) {
+ pr_err("%s: NULL private data\n", ALGORITHM_NAME);
+ return;
+ }
+
+ if (priv->bin_m1_state == BIN_INVALID) {
+ bpdev_err(priv->eq_setup.bpphy, "Invalid Bin_M1 state\n");
+ return;
+ }
+
+ if (priv->bin_m1_state == BIN_TOGGLE) {
+ update = process_bin_m1_toggle(priv);
+ } else {
+ if (priv->prev_bin_m1_state == BIN_TOGGLE) {
+ update = process_bin_m1_prev_toggle(priv);
+ } else {
+ if (priv->prev_bin_m1_state == priv->bin_m1_state) {
+ if (priv->bin_m1_state == BIN_LATE)
+ update = process_bin_m1_late(priv);
+ else
+ update = process_bin_m1_early(priv);
+ } else {
+ update = process_bin_m1_antipodal(priv);
+ }
+ }
+ }
+
+ /* Store current algorithm decision
+ * as previous algorithm ld_update for next step
+ */
+ priv->ld_update = update;
+}
+
+static u32 process_bin_long_toggle(struct eq_data_priv *priv)
+{
+ enum req_type prev_req_cp1, prev_req_cz0;
+ u32 update = lt_encode_startup_request(REQ_HOLD);
+
+ if (!priv) {
+ pr_err("%s: NULL private data\n", ALGORITHM_NAME);
+ return update;
+ }
+
+ prev_req_cp1 = lt_decode_coef_update(priv->ld_update, C_P1);
+ prev_req_cz0 = lt_decode_coef_update(priv->ld_update, C_Z0);
+
+ /* Toggle path */
+ if (priv->prev_bin_long_state == priv->bin_long_state) {
+ /* Hold C+ and C0 */
+ update = lt_encode_startup_request(REQ_HOLD);
+ } else {
+ update = lt_encode_startup_request(REQ_HOLD);
+ /* If previous step moved C+/C0 repeat C+/C0 move */
+ if (prev_req_cp1 == REQ_INC ||
+ prev_req_cp1 == REQ_DEC ||
+ prev_req_cz0 == REQ_INC ||
+ prev_req_cz0 == REQ_DEC) {
+ update = lt_encode_request(update, prev_req_cp1, C_P1);
+ update = lt_encode_request(update, prev_req_cz0, C_Z0);
+ }
+ }
+
+ return update;
+}
+
+static u32 process_bin_long_prev_toggle(struct eq_data_priv *priv)
+{
+ enum req_type prev_req_cp1, prev_req_cz0;
+ u32 update = lt_encode_startup_request(REQ_HOLD);
+
+ if (!priv) {
+ pr_err("%s: NULL private data\n", ALGORITHM_NAME);
+ return update;
+ }
+
+ prev_req_cp1 = lt_decode_coef_update(priv->ld_update, C_P1);
+ prev_req_cz0 = lt_decode_coef_update(priv->ld_update, C_Z0);
+
+ /* If previous step moved C+/C0 then go back on C+/C0 */
+ if (prev_req_cp1 == REQ_INC)
+ update = lt_encode_request(update, REQ_DEC, C_P1);
+ if (prev_req_cp1 == REQ_DEC)
+ update = lt_encode_request(update, REQ_INC, C_P1);
+ if (prev_req_cz0 == REQ_INC)
+ update = lt_encode_request(update, REQ_DEC, C_Z0);
+ if (prev_req_cz0 == REQ_DEC)
+ update = lt_encode_request(update, REQ_INC, C_Z0);
+
+ return update;
+}
+
+static u32 process_bin_long_early(struct eq_data_priv *priv)
+{
+ enum coef_status lpst_cp1, lpst_cz0;
+ u32 update = lt_encode_startup_request(REQ_HOLD);
+
+ if (!priv) {
+ pr_err("%s: NULL private data\n", ALGORITHM_NAME);
+ return update;
+ }
+
+ /* Get LP coefficient status to determine
+ * if coefficient is in range or reached the limit thresholds
+ * IF the coefficient is at MIN/MAX and still want to INC/DEC
+ * THEN do we are done with this module
+ */
+ lpst_cp1 = lt_get_lp_coef_status(priv->eq_setup.krlane, C_P1);
+ lpst_cz0 = lt_get_lp_coef_status(priv->eq_setup.krlane, C_Z0);
+
+ /* Early path (make edge later) */
+ if (lpst_cp1 == COEF_MAX) {
+ if (lpst_cz0 == COEF_MAX) {
+ /* Hold C+, C0 */
+ update = lt_encode_startup_request(REQ_HOLD);
+ } else {
+ /* request Increment C0 and
+ * Decrement C+
+ */
+ update = lt_encode_request(update, REQ_INC, C_Z0);
+ update = lt_encode_request(update, REQ_DEC, C_P1);
+ }
+ } else {
+ /* request Increment C+ */
+ update = lt_encode_request(update, REQ_INC, C_P1);
+ }
+
+ return update;
+}
+
+static u32 process_bin_long_late(struct eq_data_priv *priv)
+{
+ enum coef_status lpst_cp1, lpst_cz0;
+ u32 update = lt_encode_startup_request(REQ_HOLD);
+
+ if (!priv) {
+ pr_err("%s: NULL private data\n", ALGORITHM_NAME);
+ return update;
+ }
+
+ /* Get LP coefficient status to determine
+ * if coefficient is in range or reached the limit thresholds
+ * IF the coefficient is at MIN/MAX and still want to INC/DEC
+ * THEN do we are done with this module
+ */
+ lpst_cp1 = lt_get_lp_coef_status(priv->eq_setup.krlane, C_P1);
+ lpst_cz0 = lt_get_lp_coef_status(priv->eq_setup.krlane, C_Z0);
+
+ /* Late path (make edge earlier) */
+ if (lpst_cp1 == COEF_MIN) {
+ if (lpst_cz0 == COEF_MIN) {
+ /* Hold C0 */
+ update = lt_encode_startup_request(REQ_HOLD);
+ } else {
+ /* request Decrement C0 */
+ update = lt_encode_request(update, REQ_DEC, C_Z0);
+ }
+ } else {
+ /* request Decrement C+ */
+ update = lt_encode_request(update, REQ_DEC, C_P1);
+ }
+
+ return update;
+}
+
+static u32 process_bin_long_antipodal(struct eq_data_priv *priv)
+{
+ enum req_type prev_req_cp1;
+ u32 update = lt_encode_startup_request(REQ_HOLD);
+
+ if (!priv) {
+ pr_err("%s: NULL private data\n", ALGORITHM_NAME);
+ return update;
+ }
+
+ prev_req_cp1 = lt_decode_coef_update(priv->ld_update, C_P1);
+
+ /* Request move on C+ and C0 */
+ /* If previous step moved C+ then go back on C+ */
+ if (prev_req_cp1 == REQ_INC)
+ update = lt_encode_request(update, REQ_DEC, C_P1);
+ if (prev_req_cp1 == REQ_DEC)
+ update = lt_encode_request(update, REQ_INC, C_P1);
+
+ if (priv->bin_long_state == BIN_LATE) {
+ /* request Decrement C0 */
+ update = lt_encode_request(update, REQ_DEC, C_Z0);
+ } else {
+ /* request Increment C0 */
+ update = lt_encode_request(update, REQ_INC, C_Z0);
+ }
+
+ return update;
+}
+
+/* process_bin_long
+ *
+ * Bin_Long:
+ * contains the scoring of final edges on pulses longer than 7UI long
+ * used to adjust LP coefficients: C_P1 and C_Z0
+ */
+static void process_bin_long(struct eq_data_priv *priv)
+{
+ u32 update = lt_encode_startup_request(REQ_HOLD);
+
+ if (!priv) {
+ pr_err("%s: NULL private data\n", ALGORITHM_NAME);
+ return;
+ }
+
+ if (priv->bin_long_state == BIN_INVALID) {
+ bpdev_err(priv->eq_setup.bpphy, "Invalid Bin_Long state\n");
+ return;
+ }
+
+ if (priv->bin_long_state == BIN_TOGGLE) {
+ update = process_bin_long_toggle(priv);
+ } else {
+ if (priv->prev_bin_long_state == BIN_TOGGLE) {
+ update = process_bin_long_prev_toggle(priv);
+ } else {
+ if (priv->prev_bin_long_state == priv->bin_long_state) {
+ if (priv->bin_long_state == BIN_LATE)
+ update = process_bin_long_late(priv);
+ else
+ update = process_bin_long_early(priv);
+ } else {
+ update = process_bin_long_antipodal(priv);
+ }
+ }
+ }
+
+ /* Store current algorithm decision
+ * as previous algorithm ld_update for next step
+ */
+ priv->ld_update = update;
+}
+
+/* Callbacks:
+ * required by generic equalization_algorithm
+ */
+static void process_bad_state(struct eq_data_priv *priv)
+{
+ bool lp_at_init, lp_at_preset;
+ u32 req;
+
+ if (!priv) {
+ pr_err("%s: NULL private data\n", ALGORITHM_NAME);
+ return;
+ }
+
+ lp_at_init = lt_is_lp_at_startup(priv->eq_setup.krlane, REQ_INIT);
+ lp_at_preset = lt_is_lp_at_startup(priv->eq_setup.krlane, REQ_PRESET);
+
+ if (lp_at_init) {
+ /* Try Request Preset */
+ req = lt_encode_startup_request(REQ_PRESET);
+ lt_lp_update(priv->eq_setup.krlane, req);
+ } else if (lp_at_preset) {
+ /* LT ERROR
+ * set lt_error flag to prevent reaching
+ * training state = TRAINED
+ * and resume training in case of LT error
+ */
+ lt_set_error(priv->eq_setup.krlane, true);
+ bpdev_err(priv->eq_setup.bpphy,
+ "LT Error: CDR_LOCK is zero on Preset\n");
+ } else {
+ /* Move LP back to previous C-, C0, C+ and HOLD */
+ lt_move_lp_back(priv->eq_setup.krlane);
+ }
+}
+
+static bool collect_bin_counters(struct eq_data_priv *priv,
+ enum eqc_type type)
+{
+ struct equalizer_ops *eqops;
+ s16 *bin_snapshot = NULL;
+ int snp_size;
+
+ if (!priv) {
+ pr_err("%s: NULL private data\n", ALGORITHM_NAME);
+ return false;
+ }
+
+ /* collect Bin snapshots */
+ switch (type) {
+ case EQC_BIN_1:
+ bin_snapshot = priv->bin1_snapshot;
+ break;
+ case EQC_BIN_2:
+ bin_snapshot = priv->bin2_snapshot;
+ break;
+ case EQC_BIN_3:
+ bin_snapshot = priv->bin3_snapshot;
+ break;
+ case EQC_BIN_LONG:
+ bin_snapshot = priv->bin_long_snapshot;
+ break;
+ case EQC_BIN_OFFSET:
+ bin_snapshot = priv->bin_offset_snapshot;
+ break;
+ case EQC_BIN_M1:
+ bin_snapshot = priv->bin_m1_snapshot;
+ break;
+ default:
+ /* invalid bin type */
+ return false;
+ }
+ if (!bin_snapshot)
+ return false;
+
+ eqops = &priv->eq_setup.equalizer.ops;
+ if (!eqops) {
+ bpdev_err(priv->eq_setup.bpphy,
+ "No operations for equalizer %s %s\n",
+ priv->eq_setup.equalizer.name,
+ priv->eq_setup.equalizer.version);
+ return false;
+ }
+ snp_size = eqops->collect_counters(priv->eq_setup.reg_base, type,
+ bin_snapshot, EQ_SNAPSHOTS_SIZE);
+ /* Check if snapshots collection failed */
+ if (snp_size < EQ_SNAPSHOTS_SIZE) {
+ bpdev_err(priv->eq_setup.bpphy,
+ "Counters collection failed for equalizer %s %s\n",
+ priv->eq_setup.equalizer.name,
+ priv->eq_setup.equalizer.version);
+ return false;
+ }
+
+ /* if CDR_LOCK = 0: Statistics are invalid */
+ if (!backplane_is_cdr_lock(priv->eq_setup.krlane, true)) {
+ process_bad_state(priv);
+ return false;
+ }
+
+ return true;
+}
+
+static bool collect_bit_edge_statistics(struct eq_data_priv *priv)
+{
+ struct equalizer_ops *eqops;
+ enum eqc_type status_types[] = {
+ EQC_GAIN_HF, EQC_GAIN_MF, EQC_EQOFFSET
+ };
+ s16 status_counters[ARRAY_SIZE(status_types)][EQ_SNAPSHOTS_SIZE];
+ int i, snp_size;
+
+ if (!priv) {
+ pr_err("%s: NULL private data\n", ALGORITHM_NAME);
+ return false;
+ }
+
+ /* collect Bin snapshots */
+ if (!collect_bin_counters(priv, EQC_BIN_1))
+ return false;
+ if (!collect_bin_counters(priv, EQC_BIN_2))
+ return false;
+ if (!collect_bin_counters(priv, EQC_BIN_3))
+ return false;
+ if (!collect_bin_counters(priv, EQC_BIN_LONG))
+ return false;
+ if (!collect_bin_counters(priv, EQC_BIN_OFFSET))
+ return false;
+ if (!collect_bin_counters(priv, EQC_BIN_M1))
+ return false;
+
+ /* collect Gains */
+ eqops = &priv->eq_setup.equalizer.ops;
+ if (!eqops) {
+ bpdev_err(priv->eq_setup.bpphy,
+ "No operations for equalizer %s %s\n",
+ priv->eq_setup.equalizer.name,
+ priv->eq_setup.equalizer.version);
+ return false;
+ }
+ snp_size = eqops->collect_multiple_counters(priv->eq_setup.reg_base,
+ status_types,
+ ARRAY_SIZE(status_types),
+ (s16 *)status_counters,
+ EQ_SNAPSHOTS_SIZE);
+ /* Check if snapshots collection failed */
+ if (snp_size < EQ_SNAPSHOTS_SIZE) {
+ bpdev_err(priv->eq_setup.bpphy,
+ "Counters collection failed for equalizer %s %s\n",
+ priv->eq_setup.equalizer.name,
+ priv->eq_setup.equalizer.version);
+ return false;
+ }
+
+ for (i = 0; i < EQ_SNAPSHOTS_SIZE; i++) {
+ priv->gain_hf_snapshot[i] = (u8)status_counters[0][i];
+ priv->gain_mf_snapshot[i] = (u8)status_counters[1][i];
+ priv->osestat_snapshot[i] = (u8)status_counters[2][i];
+ }
+
+ return true;
+}
+
+static void generate_3taps_request(struct eq_data_priv *priv)
+{
+ if (!priv) {
+ pr_err("%s: NULL private data\n", ALGORITHM_NAME);
+ return;
+ }
+
+ /* Store current state as previous state */
+ priv->prev_bin_m1_state = priv->bin_m1_state;
+ priv->prev_bin_long_state = priv->bin_long_state;
+
+ priv->bin_m1_state = get_bin_snapshots_state(priv, EQC_BIN_M1);
+ if (priv->bin_m1_state == BIN_INVALID) {
+ /* invalid state: should never happen */
+ return;
+ }
+
+ priv->bin_long_state = get_bin_snapshots_state(priv, EQC_BIN_LONG);
+ if (priv->bin_long_state == BIN_INVALID) {
+ /* invalid state: should never happen */
+ return;
+ }
+
+ /* Move to BinLong/BinM1 modules:
+ * Bin Modules order: BinLong before BinM1
+ * We try to finish BinLong before we do BinM1
+ */
+
+ /* Process BinLong module
+ * decide and ask for movement of C+/C0
+ */
+ if (!priv->bin_long_stop) {
+ process_bin_long(priv);
+ lt_lp_update(priv->eq_setup.krlane, priv->ld_update);
+ if (lt_is_update_of_type(priv->ld_update, REQ_HOLD)) {
+ /* Sent All Hold request */
+ priv->long_min_max_cnt++;
+ if (priv->long_min_max_cnt >= TIMEOUT_LONG)
+ priv->bin_long_stop = true;
+ } else {
+ /* Sent C Inc/Dec request */
+ priv->long_min_max_cnt = 0;
+ }
+ return;
+ }
+
+ /* Process BinM1 module
+ * decide and ask for movement of C-
+ */
+ if (!priv->bin_m1_stop) {
+ process_bin_m1(priv);
+ lt_lp_update(priv->eq_setup.krlane, priv->ld_update);
+ if (lt_is_update_of_type(priv->ld_update, REQ_HOLD)) {
+ /* Sent All Hold request */
+ priv->m1_min_max_cnt++;
+ if (priv->m1_min_max_cnt >= TIMEOUT_M1)
+ priv->bin_m1_stop = true;
+ } else {
+ /* Sent C Inc/Dec request */
+ priv->m1_min_max_cnt = 0;
+ }
+ return;
+ }
+}
+
+static bool is_rx_ok(struct eq_data_priv *priv)
+{
+ enum bin_state bin1_snapshot_state;
+ enum bin_state bin2_snapshot_state;
+ enum bin_state bin3_snapshot_state;
+ struct eqc_range *gain_range, *osestat_range;
+ struct equalizer_ops *eqops;
+ bool rx_quality_1, rx_quality_2;
+ bool is_ok, rx_good_quality;
+ u8 min_eq_gain, max_eq_gain;
+ u8 osestat_mid_low, osestat_mid_high;
+ u8 min_snp, max_snp;
+ s16 snapshot;
+ int i;
+
+ if (!priv) {
+ pr_err("%s: NULL private data\n", ALGORITHM_NAME);
+ return false;
+ }
+
+ /* Checking Bins/Gains after LP has updated its TX */
+ eqops = &priv->eq_setup.equalizer.ops;
+ if (!eqops)
+ return false;
+ gain_range = eqops->get_counter_range(EQC_GAIN_HF);
+ if (!gain_range)
+ return false;
+ osestat_range = eqops->get_counter_range(EQC_EQOFFSET);
+ if (!osestat_range)
+ return false;
+
+ min_eq_gain = (u8)gain_range->min;
+ max_eq_gain = (u8)gain_range->max;
+ osestat_mid_low = (u8)osestat_range->mid_low;
+ osestat_mid_high = (u8)osestat_range->mid_high;
+
+ /* CDR_LOCK must be 1 */
+ if (!backplane_is_cdr_lock(priv->eq_setup.krlane, true))
+ return false;
+
+ /* Offset Bin must NOT be 10 of the same value */
+ rx_good_quality = false;
+ snapshot = priv->bin_offset_snapshot[0];
+ for (i = 0; i < EQ_SNAPSHOTS_SIZE; i++) {
+ if (snapshot != priv->bin_offset_snapshot[i]) {
+ rx_good_quality = true;
+ break;
+ }
+ }
+ if (!rx_good_quality)
+ return false;
+
+ /* Offset status must dither (+/-2) around MidRange value
+ * What we want to see is that the Offset has settled to a value
+ * somewhere between: mid-range low and mid-range high and that
+ * the series of snapshot values are +/-2 of the settled value.
+ */
+ rx_good_quality = true;
+ min_snp = priv->osestat_snapshot[0];
+ max_snp = priv->osestat_snapshot[0];
+ for (i = 0; i < EQ_SNAPSHOTS_SIZE; i++) {
+ if (priv->osestat_snapshot[i] < osestat_mid_low ||
+ priv->osestat_snapshot[i] > osestat_mid_high) {
+ rx_good_quality = false;
+ break;
+ }
+ if (priv->osestat_snapshot[i] < min_snp)
+ min_snp = priv->osestat_snapshot[i];
+ if (priv->osestat_snapshot[i] > max_snp)
+ max_snp = priv->osestat_snapshot[i];
+ }
+ if (max_snp - min_snp > 4)
+ rx_good_quality = false;
+ if (!rx_good_quality)
+ return false;
+
+ /* The Rx is in good quality if:
+ * Bin1, Bin2, and Bin3 are toggling
+ * Proceed to BinLong/BinM1 modules
+ */
+ bin1_snapshot_state = get_bin_snapshots_state(priv, EQC_BIN_1);
+ bin2_snapshot_state = get_bin_snapshots_state(priv, EQC_BIN_2);
+ bin3_snapshot_state = get_bin_snapshots_state(priv, EQC_BIN_3);
+
+ rx_good_quality = (bin1_snapshot_state == BIN_TOGGLE &&
+ bin2_snapshot_state == BIN_TOGGLE &&
+ bin3_snapshot_state == BIN_TOGGLE);
+
+ /* If Rx is in good quality then proceed to BinLong/BinM1 */
+ if (rx_good_quality)
+ return true;
+
+#ifdef ENABLE_LESS_QUALITY_CONDITION
+ rx_quality_1 = false;
+ rx_quality_2 = false;
+ if (bin1_snapshot_state == BIN_TOGGLE) {
+ if (bin2_snapshot_state == BIN_EARLY &&
+ bin3_snapshot_state == BIN_LATE) {
+ /* check if GainMF is stuck at max_eq_gain */
+ rx_quality_1 = true;
+ for (i = 0; i < EQ_SNAPSHOTS_SIZE; i++) {
+ if (priv->gain_mf_snapshot[i] != max_eq_gain) {
+ rx_quality_1 = false;
+ break;
+ }
+ }
+ }
+ if (bin2_snapshot_state == BIN_LATE &&
+ bin3_snapshot_state == BIN_EARLY) {
+ /* check if GainMF is stuck at min_eq_gain */
+ rx_quality_2 = true;
+ for (i = 0; i < EQ_SNAPSHOTS_SIZE; i++) {
+ if (priv->gain_mf_snapshot[i] != min_eq_gain) {
+ rx_quality_2 = false;
+ break;
+ }
+ }
+ }
+ }
+
+ /* If Rx is less quality then proceed to BinLong/BinM1 */
+ if (rx_quality_1 || rx_quality_2)
+ return true;
+#endif
+
+#ifdef ENABLE_EVEN_LESS_QUALITY_CONDITION
+ rx_quality_1 = false;
+ rx_quality_2 = false;
+ if (bin1_snapshot_state == BIN_EARLY &&
+ bin2_snapshot_state == BIN_LATE) {
+ /* check if GainHF is stuck at max_eq_gain */
+ is_ok = true;
+ for (i = 0; i < EQ_SNAPSHOTS_SIZE; i++) {
+ if (priv->gain_hf_snapshot[i] != max_eq_gain) {
+ is_ok = false;
+ break;
+ }
+ }
+ if (is_ok) {
+ /* check if GainMF is stuck at min_eq_gain */
+ is_ok = true;
+ for (i = 0; i < EQ_SNAPSHOTS_SIZE; i++) {
+ if (priv->gain_mf_snapshot[i] != min_eq_gain) {
+ is_ok = false;
+ break;
+ }
+ }
+ if (is_ok)
+ rx_quality_1 = true;
+ }
+ }
+ if (bin1_snapshot_state == BIN_LATE &&
+ bin2_snapshot_state == BIN_EARLY) {
+ /* check if GainHF is stuck at min_eq_gain */
+ is_ok = true;
+ for (i = 0; i < EQ_SNAPSHOTS_SIZE; i++) {
+ if (priv->gain_hf_snapshot[i] != min_eq_gain) {
+ is_ok = false;
+ break;
+ }
+ }
+ if (is_ok) {
+ /* check if GainMF is stuck at max_eq_gain */
+ is_ok = true;
+ for (i = 0; i < EQ_SNAPSHOTS_SIZE; i++) {
+ if (priv->gain_mf_snapshot[i] != max_eq_gain) {
+ is_ok = false;
+ break;
+ }
+ }
+ if (is_ok)
+ rx_quality_2 = true;
+ }
+ }
+
+ /* If Rx is in good quality then proceed to BinLong/BinM1 */
+ if (rx_quality_1 || rx_quality_2)
+ return true;
+#endif
+
+#ifdef ENABLE_SEEMINGLY_QUALITY_CONDITION
+ rx_quality_1 = false;
+ if (bin1_snapshot_state == BIN_LATE &&
+ bin2_snapshot_state == BIN_TOGGLE &&
+ bin3_snapshot_state == BIN_TOGGLE) {
+ /* check if GainHF is stuck at min_eq_gain */
+ rx_quality_1 = true;
+ for (i = 0; i < EQ_SNAPSHOTS_SIZE; i++) {
+ if (priv->gain_hf_snapshot[i] != min_eq_gain) {
+ rx_quality_1 = false;
+ break;
+ }
+ }
+ }
+
+ if (rx_quality_1)
+ return true;
+#endif
+
+ return false;
+}
+
+static bool is_eq_done(struct eq_data_priv *priv)
+{
+ if (!priv) {
+ pr_err("%s: NULL private data\n", ALGORITHM_NAME);
+ return false;
+ }
+
+ return (priv->bin_m1_stop && priv->bin_long_stop);
+}
+
+/* BEE 3 TAP Algorithm API */
+
+/* Create BEE 3-TAP Equalization Algorithm */
+static struct eq_data_priv *create(struct eq_setup_info setup)
+{
+ struct eq_data_priv *bee_data;
+
+ bee_data = devm_kzalloc(&setup.bpphy->mdio.dev,
+ sizeof(*bee_data), GFP_KERNEL);
+ if (!bee_data)
+ return NULL;
+
+ /* initialize algorithm setup data */
+ bee_data->eq_setup = setup;
+
+ /* initialize specific BEE algorithm data */
+ bee_data->bin_m1_state = BIN_INVALID;
+ bee_data->bin_long_state = BIN_INVALID;
+ bee_data->prev_bin_m1_state = BIN_INVALID;
+ bee_data->prev_bin_long_state = BIN_INVALID;
+ bee_data->m1_min_max_cnt = 0;
+ bee_data->long_min_max_cnt = 0;
+ bee_data->bin_m1_stop = false;
+ bee_data->bin_long_stop = false;
+ bee_data->ld_update = 0;
+
+ return bee_data;
+}
+
+static void destroy(struct eq_data_priv *priv)
+{
+ if (!priv) {
+ pr_err("%s: NULL private data\n", ALGORITHM_NAME);
+ return;
+ }
+
+ kfree(priv);
+}
+
+static const struct equalization_algorithm eq_alg = {
+ .name = ALGORITHM_NAME,
+ .descr = ALGORITHM_DESCR,
+ .version = ALGORITHM_VERSION,
+ .use_local_tx_training = true,
+ .use_remote_tx_training = true,
+ .ops = {
+ .create = create,
+ .destroy = destroy,
+ .is_rx_ok = is_rx_ok,
+ .is_eq_done = is_eq_done,
+ .collect_statistics = collect_bit_edge_statistics,
+ .generate_request = generate_3taps_request,
+ .process_bad_state = process_bad_state,
+ .dump_algorithm_context = NULL,
+ }
+};
+
+static const char * const alg_keys[] = {
+ "bee",
+ "BEE",
+};
+
+static int __init bee_init(void)
+{
+ int i, err;
+
+ pr_info("%s: %s algorithm version %s\n",
+ ALGORITHM_NAME, ALGORITHM_DESCR, ALGORITHM_VERSION);
+
+ /* register BEE algorithm: */
+ for (i = 0; i < ARRAY_SIZE(alg_keys); i++) {
+ err = backplane_eq_register(alg_keys[i], &eq_alg);
+ if (err) {
+ pr_err("%s: '%s' equalization algorithm registration failed\n",
+ ALGORITHM_NAME, alg_keys[i]);
+ }
+ }
+
+ return 0;
+}
+
+static void __exit bee_exit(void)
+{
+ int i;
+
+ /* unregister BEE algorithm: */
+ for (i = 0; i < ARRAY_SIZE(alg_keys); i++)
+ backplane_eq_unregister(alg_keys[i]);
+
+ pr_info("%s: %s algorithm version %s unloaded\n",
+ ALGORITHM_NAME, ALGORITHM_DESCR, ALGORITHM_VERSION);
+}
+
+module_init(bee_init);
+module_exit(bee_exit);
+
+MODULE_DESCRIPTION("Bit Edge Equalization Algorithm");
+MODULE_AUTHOR("Florinel Iordache <florinel.iordache@nxp.com>");
+MODULE_LICENSE("Dual BSD/GPL");
--
1.9.1
\
 
 \ /
  Last update: 2020-03-26 14:55    [W:0.158 / U:1.880 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site