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Message-ID: <1605629162-31876-5-git-send-email-min.li.xe@renesas.com>
Date: Tue, 17 Nov 2020 11:06:01 -0500
From: <min.li.xe@...esas.com>
To: <richardcochran@...il.com>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
Min Li <min.li.xe@...esas.com>
Subject: [PATCH v2 net-next 4/5] ptp: clockmatrix: Fix non-zero phase_adj is lost after snap
From: Min Li <min.li.xe@...esas.com>
Fix non-zero phase_adj is lost after snap. Use ktime_sub
to do ktime_t subtraction.
Signed-off-by: Min Li <min.li.xe@...esas.com>
---
drivers/ptp/ptp_clockmatrix.c | 210 +++++++++++++++++++++++++++++++++++++-----
drivers/ptp/ptp_clockmatrix.h | 5 +-
2 files changed, 190 insertions(+), 25 deletions(-)
diff --git a/drivers/ptp/ptp_clockmatrix.c b/drivers/ptp/ptp_clockmatrix.c
index c06df61..b10c6b9 100644
--- a/drivers/ptp/ptp_clockmatrix.c
+++ b/drivers/ptp/ptp_clockmatrix.c
@@ -716,8 +716,9 @@ static int _idtcm_set_dpll_hw_tod(struct idtcm_channel *channel,
if (idtcm->calculate_overhead_flag) {
/* Assumption: I2C @ 400KHz */
- total_overhead_ns = ktime_to_ns(ktime_get_raw()
- - idtcm->start_time)
+ ktime_t diff = ktime_sub(ktime_get_raw(),
+ idtcm->start_time);
+ total_overhead_ns = ktime_to_ns(diff)
+ idtcm->tod_write_overhead_ns
+ SETTIME_CORRECTION;
@@ -800,12 +801,154 @@ static int _idtcm_set_dpll_scsr_tod(struct idtcm_channel *channel,
return 0;
}
+static int get_output_base_addr(u8 outn)
+{
+ int base;
+
+ switch (outn) {
+ case 0:
+ base = OUTPUT_0;
+ break;
+ case 1:
+ base = OUTPUT_1;
+ break;
+ case 2:
+ base = OUTPUT_2;
+ break;
+ case 3:
+ base = OUTPUT_3;
+ break;
+ case 4:
+ base = OUTPUT_4;
+ break;
+ case 5:
+ base = OUTPUT_5;
+ break;
+ case 6:
+ base = OUTPUT_6;
+ break;
+ case 7:
+ base = OUTPUT_7;
+ break;
+ case 8:
+ base = OUTPUT_8;
+ break;
+ case 9:
+ base = OUTPUT_9;
+ break;
+ case 10:
+ base = OUTPUT_10;
+ break;
+ case 11:
+ base = OUTPUT_11;
+ break;
+ default:
+ base = -EINVAL;
+ }
+
+ return base;
+}
+
+static void save_and_clear_output_phase_adj(struct idtcm_channel *channel)
+{
+ u16 output_mask = channel->output_mask;
+ struct idtcm *idtcm = channel->idtcm;
+ int delay_needed = 0;
+ u8 zero[4] = {0};
+ u8 outn = 0;
+ int base;
+
+ while (output_mask) {
+
+ if (output_mask & 1) {
+
+ base = get_output_base_addr(outn);
+
+ if (!(base > 0)) {
+ dev_err(&idtcm->client->dev,
+ "%s - Unsupported out%d",
+ __func__, outn);
+ return;
+ }
+
+ /* Save output_phase_adj for outn */
+ idtcm_read(idtcm, (u16)base, OUT_PHASE_ADJ,
+ &channel->output_phase_adj[outn][0],
+ sizeof(channel->output_phase_adj[outn]));
+
+ if (channel->output_phase_adj[outn][0] |
+ channel->output_phase_adj[outn][1] |
+ channel->output_phase_adj[outn][2] |
+ channel->output_phase_adj[outn][3]) {
+ delay_needed = 1;
+
+ idtcm_write(idtcm, base, OUT_PHASE_ADJ,
+ &zero[0], sizeof(zero));
+ }
+ }
+
+ output_mask = output_mask >> 1;
+ outn += 1;
+ }
+
+ /* Ensure output phase adjust has settled */
+ if (delay_needed)
+ msleep(5000);
+}
+
+
+static void restore_output_phase_adj(struct idtcm_channel *channel)
+{
+ u16 output_mask = channel->output_mask;
+ struct idtcm *idtcm = channel->idtcm;
+ u8 wait_once = 0;
+ u8 outn = 0;
+ int base;
+
+ while (output_mask) {
+
+ if ((output_mask & 1) &&
+ (channel->output_phase_adj[outn][0] |
+ channel->output_phase_adj[outn][1] |
+ channel->output_phase_adj[outn][2] |
+ channel->output_phase_adj[outn][3])) {
+
+ if (!wait_once) {
+ /* Ensure idtcm_sync_pps_output() is done */
+ msleep(5000);
+ wait_once = 1;
+ }
+
+ base = get_output_base_addr(outn);
+
+ if (!(base > 0)) {
+ dev_err(&idtcm->client->dev,
+ "%s - Unsupported out%d",
+ __func__, outn);
+ return;
+ }
+
+ /* Restore non-zero output_phase_adj */
+ idtcm_write(idtcm, base, OUT_PHASE_ADJ,
+ &channel->output_phase_adj[outn][0],
+ sizeof(channel->output_phase_adj[outn]));
+ }
+
+ output_mask = output_mask >> 1;
+ outn += 1;
+ }
+}
+
static int _idtcm_settime(struct idtcm_channel *channel,
struct timespec64 const *ts)
{
struct idtcm *idtcm = channel->idtcm;
+ int retval;
int err;
+ /* Save and clear out_phase_adj */
+ save_and_clear_output_phase_adj(channel);
+
err = _idtcm_set_dpll_hw_tod(channel, ts, HW_TOD_WR_TRIG_SEL_MSB);
if (err) {
@@ -814,7 +957,12 @@ static int _idtcm_settime(struct idtcm_channel *channel,
return err;
}
- return idtcm_sync_pps_output(channel);
+ retval = idtcm_sync_pps_output(channel);
+
+ /* Restore out_phase_adj */
+ restore_output_phase_adj(channel);
+
+ return retval;
}
static int _idtcm_settime_v487(struct idtcm_channel *channel,
@@ -924,6 +1072,7 @@ static int set_tod_write_overhead(struct idtcm_channel *channel)
ktime_t start;
ktime_t stop;
+ ktime_t diff;
char buf[TOD_BYTE_COUNT] = {0};
@@ -943,7 +1092,9 @@ static int set_tod_write_overhead(struct idtcm_channel *channel)
stop = ktime_get_raw();
- current_ns = ktime_to_ns(stop - start);
+ diff = ktime_sub(stop, start);
+
+ current_ns = ktime_to_ns(diff);
if (i == 0) {
lowest_ns = current_ns;
@@ -1263,11 +1414,19 @@ static int idtcm_output_enable(struct idtcm_channel *channel,
bool enable, unsigned int outn)
{
struct idtcm *idtcm = channel->idtcm;
+ int base;
int err;
u8 val;
- err = idtcm_read(idtcm, OUTPUT_MODULE_FROM_INDEX(outn),
- OUT_CTRL_1, &val, sizeof(val));
+ base = get_output_base_addr(outn);
+
+ if (!(base > 0)) {
+ dev_err(&idtcm->client->dev,
+ "%s - Unsupported out%d", __func__, outn);
+ return base;
+ }
+
+ err = idtcm_read(idtcm, (u16)base, OUT_CTRL_1, &val, sizeof(val));
if (err)
return err;
@@ -1277,8 +1436,7 @@ static int idtcm_output_enable(struct idtcm_channel *channel,
else
val &= ~SQUELCH_DISABLE;
- return idtcm_write(idtcm, OUTPUT_MODULE_FROM_INDEX(outn),
- OUT_CTRL_1, &val, sizeof(val));
+ return idtcm_write(idtcm, (u16)base, OUT_CTRL_1, &val, sizeof(val));
}
static int idtcm_output_mask_enable(struct idtcm_channel *channel,
@@ -1321,6 +1479,23 @@ static int idtcm_perout_enable(struct idtcm_channel *channel,
return idtcm_output_enable(channel, enable, perout->index);
}
+static int idtcm_get_pll_mode(struct idtcm_channel *channel,
+ enum pll_mode *pll_mode)
+{
+ struct idtcm *idtcm = channel->idtcm;
+ int err;
+ u8 dpll_mode;
+
+ err = idtcm_read(idtcm, channel->dpll_n, DPLL_MODE,
+ &dpll_mode, sizeof(dpll_mode));
+ if (err)
+ return err;
+
+ *pll_mode = (dpll_mode >> PLL_MODE_SHIFT) & PLL_MODE_MASK;
+
+ return 0;
+}
+
static int idtcm_set_pll_mode(struct idtcm_channel *channel,
enum pll_mode pll_mode)
{
@@ -1386,7 +1561,7 @@ static int _idtcm_adjphase(struct idtcm_channel *channel, s32 delta_ns)
else if (offset_ps < -MAX_ABS_WRITE_PHASE_PICOSECONDS)
offset_ps = -MAX_ABS_WRITE_PHASE_PICOSECONDS;
- phase_50ps = DIV_ROUND_CLOSEST(div64_s64(offset_ps, 50), 1);
+ phase_50ps = div_s64(offset_ps, 50);
for (i = 0; i < 4; i++) {
buf[i] = phase_50ps & 0xff;
@@ -1403,7 +1578,6 @@ static int _idtcm_adjfine(struct idtcm_channel *channel, long scaled_ppm)
{
struct idtcm *idtcm = channel->idtcm;
u8 i;
- bool neg_adj = 0;
int err;
u8 buf[6] = {0};
s64 fcw;
@@ -1427,18 +1601,11 @@ static int _idtcm_adjfine(struct idtcm_channel *channel, long scaled_ppm)
* FCW = -------------
* 111 * 2^4
*/
- if (scaled_ppm < 0) {
- neg_adj = 1;
- scaled_ppm = -scaled_ppm;
- }
/* 2 ^ -53 = 1.1102230246251565404236316680908e-16 */
fcw = scaled_ppm * 244140625ULL;
- fcw = div_u64(fcw, 1776);
-
- if (neg_adj)
- fcw = -fcw;
+ fcw = div_s64(fcw, 1776);
for (i = 0; i < 6; i++) {
buf[i] = fcw & 0xff;
@@ -2105,12 +2272,11 @@ static int idtcm_enable_channel(struct idtcm *idtcm, u32 index)
}
}
- err = idtcm_set_pll_mode(channel, PLL_MODE_WRITE_FREQUENCY);
+ /* Sync pll mode with hardware */
+ err = idtcm_get_pll_mode(channel, &channel->pll_mode);
if (err) {
dev_err(&idtcm->client->dev,
- "Failed at line %d in func %s!\n",
- __LINE__,
- __func__);
+ "Error: %s - Unable to read pll mode\n", __func__);
return err;
}
diff --git a/drivers/ptp/ptp_clockmatrix.h b/drivers/ptp/ptp_clockmatrix.h
index dd3436e..3790dfa 100644
--- a/drivers/ptp/ptp_clockmatrix.h
+++ b/drivers/ptp/ptp_clockmatrix.h
@@ -15,6 +15,7 @@
#define FW_FILENAME "idtcm.bin"
#define MAX_TOD (4)
#define MAX_PLL (8)
+#define MAX_OUTPUT (12)
#define MAX_ABS_WRITE_PHASE_PICOSECONDS (107374182350LL)
@@ -49,9 +50,6 @@
#define PHASE_PULL_IN_THRESHOLD_NS_V487 (15000)
#define TOD_WRITE_OVERHEAD_COUNT_MAX (2)
#define TOD_BYTE_COUNT (11)
-#define WR_PHASE_SETUP_MS (5000)
-
-#define OUTPUT_MODULE_FROM_INDEX(index) (OUTPUT_0 + (index) * 0x10)
#define PEROUT_ENABLE_OUTPUT_MASK (0xdeadbeef)
@@ -125,6 +123,7 @@ struct idtcm_channel {
enum pll_mode pll_mode;
u8 pll;
u16 output_mask;
+ u8 output_phase_adj[MAX_OUTPUT][4];
};
struct idtcm {
--
2.7.4
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