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media: cec-pin: improve status log 

Keep track of the number of short or long start bits, the number
of short or long data bits and the number of initiated or detected
low drive conditions.

Show this information in the status debugfs log.

Helpful when debugging, particularly when doing error injection
as well.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Hans Verkuil 2018-03-01 02:02:24 -05:00 committed by Mauro Carvalho Chehab
parent 865463fc03
commit 2b76e5392d
2 changed files with 68 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/media/cec/cec-pin-priv.h
View File

@ -181,6 +181,18 @@ struct cec_pin {
struct cec_msg rx_msg;
u32 rx_bit;
bool rx_toggle;
u32 rx_start_bit_low_too_short_cnt;
u64 rx_start_bit_low_too_short_ts;
u32 rx_start_bit_low_too_short_delta;
u32 rx_start_bit_too_short_cnt;
u64 rx_start_bit_too_short_ts;
u32 rx_start_bit_too_short_delta;
u32 rx_start_bit_too_long_cnt;
u32 rx_data_bit_too_short_cnt;
u64 rx_data_bit_too_short_ts;
u32 rx_data_bit_too_short_delta;
u32 rx_data_bit_too_long_cnt;
u32 rx_low_drive_cnt;
struct cec_msg work_rx_msg;
u8 work_tx_status;
@ -205,6 +217,7 @@ struct cec_pin {
bool tx_generated_poll;
bool tx_post_eom;
u8 tx_extra_bytes;
u32 tx_low_drive_cnt;
#ifdef CONFIG_CEC_PIN_ERROR_INJ
u64 error_inj[CEC_ERROR_INJ_OP_ANY + 1];
u8 error_inj_args[CEC_ERROR_INJ_OP_ANY + 1][CEC_ERROR_INJ_NUM_ARGS];

58
drivers/media/cec/cec-pin.c
View File

@ -432,6 +432,7 @@ static void cec_pin_tx_states(struct cec_pin *pin, ktime_t ts)
pin->state = CEC_ST_TX_WAIT_FOR_HIGH;
pin->work_tx_ts = ts;
pin->work_tx_status = CEC_TX_STATUS_LOW_DRIVE;
pin->tx_low_drive_cnt++;
wake_up_interruptible(&pin->kthread_waitq);
break;
}
@ -463,6 +464,7 @@ static void cec_pin_tx_states(struct cec_pin *pin, ktime_t ts)
break;
pin->work_tx_ts = ts;
pin->work_tx_status = CEC_TX_STATUS_LOW_DRIVE;
pin->tx_low_drive_cnt++;
wake_up_interruptible(&pin->kthread_waitq);
break;
}
@ -656,6 +658,10 @@ static void cec_pin_rx_states(struct cec_pin *pin, ktime_t ts)
delta = ktime_us_delta(ts, pin->ts);
/* Start bit low is too short, go back to idle */
if (delta < CEC_TIM_START_BIT_LOW_MIN - CEC_TIM_IDLE_SAMPLE) {
if (!pin->rx_start_bit_low_too_short_cnt++) {
pin->rx_start_bit_low_too_short_ts = pin->ts;
pin->rx_start_bit_low_too_short_delta = delta;
}
cec_pin_to_idle(pin);
break;
}
@ -676,6 +682,7 @@ static void cec_pin_rx_states(struct cec_pin *pin, ktime_t ts)
* and go to idle. We just pick TOTAL_LONG.
*/
if (v && delta > CEC_TIM_START_BIT_TOTAL_LONG) {
pin->rx_start_bit_too_long_cnt++;
cec_pin_to_idle(pin);
break;
}
@ -683,6 +690,10 @@ static void cec_pin_rx_states(struct cec_pin *pin, ktime_t ts)
break;
/* Start bit is too short, go back to idle */
if (delta < CEC_TIM_START_BIT_TOTAL_MIN - CEC_TIM_IDLE_SAMPLE) {
if (!pin->rx_start_bit_too_short_cnt++) {
pin->rx_start_bit_too_short_ts = pin->ts;
pin->rx_start_bit_too_short_delta = delta;
}
cec_pin_to_idle(pin);
break;
}
@ -690,6 +701,7 @@ static void cec_pin_rx_states(struct cec_pin *pin, ktime_t ts)
/* Error injection: go to low drive */
cec_pin_low(pin);
pin->state = CEC_ST_RX_LOW_DRIVE;
pin->rx_low_drive_cnt++;
break;
}
pin->state = CEC_ST_RX_DATA_SAMPLE;
@ -728,6 +740,7 @@ static void cec_pin_rx_states(struct cec_pin *pin, ktime_t ts)
* and go to idle. We just pick TOTAL_LONG.
*/
if (v && delta > CEC_TIM_DATA_BIT_TOTAL_LONG) {
pin->rx_data_bit_too_long_cnt++;
cec_pin_to_idle(pin);
break;
}
@ -738,6 +751,7 @@ static void cec_pin_rx_states(struct cec_pin *pin, ktime_t ts)
/* Error injection: go to low drive */
cec_pin_low(pin);
pin->state = CEC_ST_RX_LOW_DRIVE;
pin->rx_low_drive_cnt++;
break;
}
@ -746,8 +760,13 @@ static void cec_pin_rx_states(struct cec_pin *pin, ktime_t ts)
* too short.
*/
if (delta < CEC_TIM_DATA_BIT_TOTAL_MIN) {
if (!pin->rx_data_bit_too_short_cnt++) {
pin->rx_data_bit_too_short_ts = pin->ts;
pin->rx_data_bit_too_short_delta = delta;
}
cec_pin_low(pin);
pin->state = CEC_ST_RX_LOW_DRIVE;
pin->rx_low_drive_cnt++;
break;
}
pin->ts = ts;
@ -1148,9 +1167,9 @@ static void cec_pin_adap_status(struct cec_adapter *adap,
{
struct cec_pin *pin = adap->pin;
seq_printf(file, "state: %s\n", states[pin->state].name);
seq_printf(file, "tx_bit: %d\n", pin->tx_bit);
seq_printf(file, "rx_bit: %d\n", pin->rx_bit);
seq_printf(file, "state: %s\n", states[pin->state].name);
seq_printf(file, "tx_bit: %d\n", pin->tx_bit);
seq_printf(file, "rx_bit: %d\n", pin->rx_bit);
seq_printf(file, "cec pin: %d\n", pin->ops->read(adap));
seq_printf(file, "irq failed: %d\n", pin->enable_irq_failed);
if (pin->timer_100ms_overruns) {
@ -1163,11 +1182,44 @@ static void cec_pin_adap_status(struct cec_adapter *adap,
seq_printf(file, "avg timer overrun: %u usecs\n",
pin->timer_sum_overrun / pin->timer_100ms_overruns);
}
if (pin->rx_start_bit_low_too_short_cnt)
seq_printf(file,
"rx start bit low too short: %u (delta %u, ts %llu)\n",
pin->rx_start_bit_low_too_short_cnt,
pin->rx_start_bit_low_too_short_delta,
pin->rx_start_bit_low_too_short_ts);
if (pin->rx_start_bit_too_short_cnt)
seq_printf(file,
"rx start bit too short: %u (delta %u, ts %llu)\n",
pin->rx_start_bit_too_short_cnt,
pin->rx_start_bit_too_short_delta,
pin->rx_start_bit_too_short_ts);
if (pin->rx_start_bit_too_long_cnt)
seq_printf(file, "rx start bit too long: %u\n",
pin->rx_start_bit_too_long_cnt);
if (pin->rx_data_bit_too_short_cnt)
seq_printf(file,
"rx data bit too short: %u (delta %u, ts %llu)\n",
pin->rx_data_bit_too_short_cnt,
pin->rx_data_bit_too_short_delta,
pin->rx_data_bit_too_short_ts);
if (pin->rx_data_bit_too_long_cnt)
seq_printf(file, "rx data bit too long: %u\n",
pin->rx_data_bit_too_long_cnt);
seq_printf(file, "rx initiated low drive: %u\n", pin->rx_low_drive_cnt);
seq_printf(file, "tx detected low drive: %u\n", pin->tx_low_drive_cnt);
pin->timer_cnt = 0;
pin->timer_100ms_overruns = 0;
pin->timer_300ms_overruns = 0;
pin->timer_max_overrun = 0;
pin->timer_sum_overrun = 0;
pin->rx_start_bit_low_too_short_cnt = 0;
pin->rx_start_bit_too_short_cnt = 0;
pin->rx_start_bit_too_long_cnt = 0;
pin->rx_data_bit_too_short_cnt = 0;
pin->rx_data_bit_too_long_cnt = 0;
pin->rx_low_drive_cnt = 0;
pin->tx_low_drive_cnt = 0;
if (pin->ops->status)
pin->ops->status(adap, file);
}