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Subject: cec-ctl: improve the low drive max length check Author: Hans Verkuil <hans.verk...@cisco.com> Date: Fri Feb 9 14:49:28 2018 +0100 If the low drive starts at the end of a 0 bit, then the actual maximum time that the bus can be low is the two summed (the time the bus was low for the 0 bit and the time of the low drive itself). The earlier test was too strict. Signed-off-by: Hans Verkuil <hans.verk...@cisco.com> utils/cec-ctl/cec-pin.cpp | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) --- http://git.linuxtv.org/cgit.cgi/v4l-utils.git/commit/?id=7dbb7a13901dadb1af2dec5424f605e827b3fa75 diff --git a/utils/cec-ctl/cec-pin.cpp b/utils/cec-ctl/cec-pin.cpp index 3537c03e1117..46fc62f480f8 100644 --- a/utils/cec-ctl/cec-pin.cpp +++ b/utils/cec-ctl/cec-pin.cpp @@ -250,9 +250,16 @@ static void cec_pin_rx_data_bit_was_high(bool is_high, __u64 ev_ts, static void cec_pin_rx_data_bit_was_low(__u64 ev_ts, __u64 usecs, __u64 usecs_min, bool show) { + /* + * If the low drive starts at the end of a 0 bit, then the actual + * maximum time that the bus can be low is the two summed. + */ + const unsigned max_low_drive = CEC_TIM_LOW_DRIVE_ERROR_MAX + + CEC_TIM_DATA_BIT_0_LOW_MAX + CEC_TIM_MARGIN; + low_usecs = usecs; if (usecs >= CEC_TIM_LOW_DRIVE_ERROR_MIN - CEC_TIM_MARGIN) { - if (usecs_min >= CEC_TIM_LOW_DRIVE_ERROR_MAX && show) + if (usecs >= max_low_drive && show) printf("%10.06f: warn: low drive too long (%.2f > %.2f ms)\n\n", ts, usecs / 1000.0, CEC_TIM_LOW_DRIVE_ERROR_MAX / 1000.0); _______________________________________________ linuxtv-commits mailing list linuxtv-commits@linuxtv.org https://www.linuxtv.org/cgi-bin/mailman/listinfo/linuxtv-commits
