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/linux/Documentation/tools/rtla/
H A Drtla-hwnoise.rst9 Detect and quantify hardware-related noise
25 noise is allowed.
43 The tool is set to detect any noise higher than *one microsecond*,
48 Hardware-related Noise
50 …CPU Period Runtime Noise % CPU Aval Max Noise Max Single HW NMI
62 the tool effectively runs on the CPU. The *Noise* column is the sum of
63 all noise that the tool observed, and the *% CPU Aval* is the relation
64 between the *Runtime* and *Noise*.
66 The *Max Noise* column is the maximum hardware noise the tool detected in a
67 single period, and the *Max Single* is the maximum single noise seen.
[all …]
H A Drtla-osnoise.rst5 Measure the operating system noise
20 a summary of the noise of the operating system, including the counters of
22 for each noise via the **osnoise:** tracepoints. The **rtla osnoise top**
24 The **rtla osnoise hist** mode displays information about the noise using
H A Drtla-osnoise-top.rst7 Display a summary of the operating system noise
44 Operating System Noise
46 …CPU Period Runtime Noise % CPU Aval Max Noise Max Single HW NM…
/linux/Documentation/trace/
H A Dosnoise-tracer.rst6 Noise (*osnoise*) refers to the interference experienced by an application
8 NMIs, IRQs, SoftIRQs, and any other system thread can cause noise to the
9 system. Moreover, hardware-related jobs can also cause noise, for example,
13 source of noise: *hardware noise*.
36 events. When a noise happens without any interference from the operating
37 system level, the hardware noise counter increases, pointing to a
38 hardware-related noise. In this way, osnoise can account for any
40 prints the sum of all noise, the max single noise, the percentage of CPU
41 available for the thread, and the counters for the noise sources.
64 …# |||| RUNTIME NOISE % OF CPU NOISE +-------…
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/linux/include/trace/events/
H A Dosnoise.h15 u64 noise; /* noise */ member
16 u64 max_sample; /* max single noise sample */
46 __field( u64, noise )
57 __entry->noise = s->noise;
66 TP_printk("runtime=%llu noise=%llu max_sample=%llu hw_count=%d"
70 __entry->noise,
/linux/Documentation/sound/soc/
H A Dpops-clicks.rst8 powered up and causes a popping noise on the speakers).
48 Zipper Noise
50 An unwanted zipper noise can occur within the audio playback or capture stream
51 when a volume control is changed near its maximum gain value. The zipper noise
/linux/Documentation/ABI/testing/
H A Dsysfs-bus-iio-adc-mcp356432 conversions, which is on the order of magnitude of the noise
45 1/f noise into the system that can be modulated with the
49 greatly reduces (cancels out) the 1/f noise and cancels the
51 the system is not affected by this 1/f noise component of the
/linux/include/linux/input/
H A Dcma3000.h26 * @fuzz_x: Noise on X Axis
27 * @fuzz_y: Noise on Y Axis
28 * @fuzz_z: Noise on Z Axis
/linux/include/linux/mfd/
H A Dac100.h99 #define AC100_ADC_DAP_N_TH 0x8e /* Noise Threshold */
100 #define AC100_ADC_DAP_L_H_N_A_C 0x8f /* Left High Noise Avg. Coef */
101 #define AC100_ADC_DAP_L_L_N_A_C 0x90 /* Left Low Noise Avg. Coef */
102 #define AC100_ADC_DAP_R_H_N_A_C 0x91 /* Right High Noise Avg. Coef */
103 #define AC100_ADC_DAP_R_L_N_A_C 0x92 /* Right Low Noise Avg. Coef */
/linux/drivers/media/pci/cx88/
H A Dcx88-dsp.c142 /* The last 192 samples are enough for noise detection */ in noise_magnitude()
159 s32 carrier, stereo, dual, noise; in detect_a2_a2m_eiaj() local
189 noise = noise_magnitude(x, N, FREQ_NOISE_START, FREQ_NOISE_END); in detect_a2_a2m_eiaj()
192 "detect a2/a2m/eiaj: carrier=%d, stereo=%d, dual=%d, noise=%d\n", in detect_a2_a2m_eiaj()
193 carrier, stereo, dual, noise); in detect_a2_a2m_eiaj()
208 * so we probably don't need noise detection in detect_a2_a2m_eiaj()
216 (noise < 10) && in detect_a2_a2m_eiaj()
/linux/drivers/media/dvb-frontends/
H A Dlgdt330x.c496 u32 noise; /* noise value */ in lgdt3302_read_snr() local
505 noise = ((buf[0] & 7) << 16) | (buf[1] << 8) | buf[2]; in lgdt3302_read_snr()
510 noise = ((buf[0] & 7 << 3) << 13) | (buf[3] << 8) | buf[4]; in lgdt3302_read_snr()
517 noise = ((buf[0] & 3) << 8) | buf[1]; in lgdt3302_read_snr()
531 state->snr = calculate_snr(noise, c); in lgdt3302_read_snr()
533 dprintk(state, "noise = 0x%08x, snr = %d.%02d dB\n", noise, in lgdt3302_read_snr()
543 u32 noise; /* noise value */ in lgdt3303_read_snr() local
552 noise = ((buf[0] & 0x78) << 13) | (buf[1] << 8) | buf[2]; in lgdt3303_read_snr()
557 noise = ((buf[0] & 7) << 16) | (buf[3] << 8) | buf[4]; in lgdt3303_read_snr()
564 noise = (buf[0] << 8) | buf[1]; in lgdt3303_read_snr()
[all …]
H A Dor51132.c229 /* Auto CH, Auto NTSC rej, MPEGser, MPEG2tr, phase noise-high */ in or51132_setmode()
237 Auto-deinterleave; MPEGser, MPEG2tr, phase noise-high in or51132_setmode()
461 int noise, reg; in or51132_read_snr() local
467 noise = or51132_readreg(state, 0x02); in or51132_read_snr()
468 if (noise < 0) { in or51132_read_snr()
472 dprintk("read_snr noise (%d)\n", noise); in or51132_read_snr()
500 /* Calculate SNR using noise, c, and NTSC rejection correction */ in or51132_read_snr()
501 state->snr = calculate_snr(noise, c) - usK; in or51132_read_snr()
504 dprintk("%s: noise = 0x%08x, snr = %d.%02d dB\n", __func__, noise, in or51132_read_snr()
/linux/kernel/trace/
H A Dtrace_osnoise.c3 * OS Noise Tracer: computes the OS Noise suffered by a running thread.
420 seq_puts(s, " NOISE %% OF CPU NOISE +-----------------------------+\n"); in print_osnoise_headers()
444 seq_puts(s, " NOISE %% OF CPU NOISE +-----------------------------+\n"); in print_osnoise_headers()
485 entry->noise = sample->noise; in __record_osnoise_sample()
852 * occurrence, compute the noise caused by the NMI, and to remove the noise
915 * Computes the duration of the IRQ noise, and trace it. Also discounts the
916 * interference from other sources of noise could be currently being accounted.
1046 * Computes the duration of the softirq noise, and trace it. Also discounts the
1047 * interference from other sources of noise could be currently being accounted.
1118 * thread_entry - Record the starting of a thread noise window
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/linux/drivers/staging/media/atomisp/include/linux/
H A Datomisp.h60 /* Configuration used by Bayer noise reduction and YCC noise reduction */
62 /* [gain] Strength of noise reduction for Bayer NR (Used by Bayer NR) */
64 /* [gain] Strength of noise reduction for YCC NR (Used by YCC NR) */
74 /* Temporal noise reduction configuration */
279 /* De pixel noise configuration */
406 struct atomisp_tnr_config *tnr_config; /* Temporal Noise Reduction */
408 struct atomisp_ynr_config *ynr_config; /* Y(Luma) Noise Reduction */
411 struct atomisp_cnr_config *cnr_config; /* Chroma Noise Reduction */
420 struct atomisp_nr_config *nr_config; /* Noise Reduction config */
424 struct atomisp_anr_config *anr_config; /* Advanced Noise Reduction */
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/linux/drivers/net/wireless/ath/
H A Dspectral_common.h56 s8 noise; member
100 __be16 noise; member
124 __be32 noise; member
/linux/sound/soc/codecs/
H A Dwm8997.c250 ARIZONA_MIXER_CONTROLS("Noise", ARIZONA_NOISEMIX_INPUT_1_SOURCE),
252 SOC_SINGLE_TLV("Noise Generator Volume", ARIZONA_COMFORT_NOISE_GENERATOR,
296 SOC_SINGLE("Noise Gate Switch", ARIZONA_NOISE_GATE_CONTROL,
298 SOC_SINGLE_TLV("Noise Gate Threshold Volume", ARIZONA_NOISE_GATE_CONTROL,
300 SOC_ENUM("Noise Gate Hold", arizona_ng_hold),
345 ARIZONA_MIXER_ENUMS(Noise, ARIZONA_NOISEMIX_INPUT_1_SOURCE);
427 SND_SOC_DAPM_SIGGEN("NOISE"),
459 SND_SOC_DAPM_PGA("Noise Generator", ARIZONA_COMFORT_NOISE_GENERATOR,
644 ARIZONA_MIXER_WIDGETS(Noise, "Noise"),
702 { name, "Noise Generator", "Noise Generator" }, \
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/linux/drivers/net/wireless/ath/ath5k/
H A Dani.c27 * Adaptive Noise Immunity (ANI) controls five noise immunity parameters
33 * - "noise immunity"
61 * ath5k_ani_set_noise_immunity_level() - Set noise immunity level
86 ATH5K_ERR(ah, "noise immunity level %d out of range", in ath5k_ani_set_noise_immunity_level()
213 * ath5k_ani_raise_immunity() - Increase noise immunity
219 * Try to raise noise immunity (=decrease sensitivity) in several steps
231 /* first: raise noise immunity */ in ath5k_ani_raise_immunity()
302 * ath5k_ani_lower_immunity() - Decrease noise immunity
306 * Try to lower noise immunity (=increase sensitivity) in several steps
357 /* finally, reduce noise immunity */ in ath5k_ani_lower_immunity()
/linux/drivers/net/wireless/mediatek/mt76/
H A Dmt792x_mac.c240 if (!phy->noise) in mt792x_phy_update_channel()
241 phy->noise = nf << 4; in mt792x_phy_update_channel()
243 phy->noise += nf - (phy->noise >> 4); in mt792x_phy_update_channel()
250 state->noise = -(phy->noise >> 4); in mt792x_phy_update_channel()
/linux/include/uapi/linux/media/raspberrypi/
H A Dpisp_be_config.h174 * @noise_constant: Constant offset value used in noise estimation
175 * @noise_slope: Noise estimation multiplier
204 * @black_level: Black level subtracted from pixel for noise estimation
208 * @noise_constant: Noise constant used for noise estimation
209 * @noise_slope: Noise slope value used for noise estimation
210 * @noise_constant2: Second noise constant used for noise estimation
211 * @noise_slope2: Second slope value used for noise estimatio
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/linux/Documentation/input/devices/
H A Dcma3000_d0x.rst50 Noise on X Axis
53 Noise on Y Axis
56 Noise on Z Axis
/linux/drivers/net/wireless/intel/iwlwifi/dvm/
H A Ddev.h41 /* Default noise level to report when noise measurement is not available.
44 * 2) Scanning (noise measurement does not apply to associated channel)
45 * Use default noise value of -127 ... this is below the range of measurable
48 * noise info (e.g. averaging might be done in app); measured dBm values are
259 /* Sensitivity and chain noise calibration */
338 /* Chain noise (differential Rx gain) calib data */
573 * @chain_noise_scale: default chain noise scale used for gain computation
795 * chain noise reset and gain commands are the
/linux/tools/tracing/rtla/tests/
H A Dhwnoise.t9 "hwnoise --help" 0 "summary of hardware-related noise"
10 check "detect noise higher than one microsecond" \
/linux/tools/tracing/rtla/src/
H A Dosnoise_top.c100 tep_get_field_val(s, event, "noise", record, &val, 1); in osnoise_top_handler()
143 trace_seq_printf(s, "Operating System Noise"); in osnoise_top_header()
146 trace_seq_printf(s, "Hardware-related Noise"); in osnoise_top_header()
161 trace_seq_printf(s, " Noise "); in osnoise_top_header()
163 trace_seq_printf(s, " Max Noise Max Single "); in osnoise_top_header()
275 " -T/--threshold us: the minimum delta to be considered a noise", in osnoise_top_usage()
304 "rtla osnoise top: a per-cpu summary of the OS noise (version %s)\n", in osnoise_top_usage()
312 "rtla hwnoise: a summary of hardware-related noise (version %s)\n", in osnoise_top_usage()
/linux/Documentation/userspace-api/media/drivers/
H A Dthp7312.rst35 Enable/Disable auto noise reduction.
38 Set the noise reduction strength, where 0 is the weakest and 10 is the
/linux/Documentation/userspace-api/media/dvb/
H A Dfe-read-snr.rst31 The signal-to-noise ratio is stored into \*snr.
36 This ioctl call returns the signal-to-noise ratio for the signal

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