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hisi: do not probe for a sensor on the Hi3536DV100 #250

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Merged
widgetii merged 1 commit into from
Oct 17, 2026
Merged

hisi: do not probe for a sensor on the Hi3536DV100 #250

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11 changes: 11 additions & 0 deletions src/hal/hisi/hal_hisi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -678,6 +678,17 @@ void setup_hal_hisi() {
break;
}
possible_i2c_addrs = my_possible_i2c_addrs;
#ifdef IPCHW_HISI_3536D
/* The Hi3536DV100 is a decoder with no video input, so there is no sensor
* to find, and probing for one is not free. Its i2c0 has nothing on the
* wire on an NVR, and the kernel's hibvt-i2c runs it in polling mode (the
* device tree gives it no interrupt): every transfer spins udelay(50)
* 0x10000 times, 3.3 s on the SoC's only core, before "wait idle timeout".
* The full table is 38 such transfers -- the board stopped answering ping
* for two minutes on every report. */
if (chip_generation == HISI_3536D)
possible_i2c_addrs = NULL;
#endif
hal_temperature = hisi_get_temp;
#ifndef STANDALONE_LIBRARY
hal_detect_ethernet = hisi_ethdetect;
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