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Update research-ingenic.md (#201)
gtxaspec
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@ -4,4 +4,101 @@
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Ingenic SoC research and debugging notes
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----------------------------------------
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Collection of information...
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#### Control PWM channels on ingenic devices using `ingenic-pwm` utility included with OpenIPC:
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```
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INGENIC PWM Control Version: Oct 19 2023_18:01:16_latest-2294-g72f266e7
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Usage: ingenic-pwm [options]
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Options:
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-c, --channel=<0-7> Specify PWM channel number
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-q, --query Query channel state
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-e, --enable Enable channel
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-d, --disable Disable channel
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-p, --polarity=<0|1> Set polarity (0: Inversed, 1: Normal)
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-D, --duty=<duty_ns> Set duty cycle in ns
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-P, --period=<period_ns> Set period in ns
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-r, --ramp=<value> Ramp PWM (+value: Ramp up, -value: Ramp down)
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-x, --max_duty=<max_duty_ns> Set max duty for ramping
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-n, --min_duty=<min_duty_ns> Set min duty for ramping
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-h, --help Display this help message
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```
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Example commands:
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Turn on LED, Dim ON: Set PWM Channel 3 enabled, Period to 1000000, min Duty 0, max Duty 1000000, ramp rate + Dim Up, - to Dim down
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`ingenic-pwm -c 3 -e -p 1 -P 1000000 -n 0 -x 1000000 -r 50000`
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`ingenic-pwm -c 3 -e -p 1 -P 1000000 -n 0 -x 1000000 -r -50000`
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---
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#### Enable full engineering debuging
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Enable: Run `switch_debug on` to enable debugging
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Disable: Run `switch debug off` or `switch_debug` to surpress debugging output
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Enabling will enable **FULL** engineering debuging output in dmesg.
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---
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#### Dynamic Debugging
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Dynamic Debugging has been enabled on the Linux Kernel for the Ingenic platforms to surpress excess engineering debugging.
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https://www.kernel.org/doc/html/v4.14/admin-guide/dynamic-debug-howto.html
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Mount debugfs first:
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`mount -t debugfs none /sys/kernel/debug`
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Check entries:
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`cat /sys/kernel/debug/dynamic_debug/control`
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Example output:
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```
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../ingenic-opensdk/kernel/avpu/t31/avpu_main.c:314 [avpu]write_reg =_ "Out-of-range register write: 0x%.4X\012"
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../ingenic-opensdk/kernel/avpu/t31/avpu_main.c:304 [avpu]write_reg =_ "Reg write: 0x%.4X: 0x%.8x\012"
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../ingenic-opensdk/kernel/avpu/t31/avpu_main.c:302 [avpu]write_reg =_ "Reg write: 0x%.4X: 0x%.8x\012"
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../ingenic-opensdk/kernel/avpu/t31/avpu_main.c:290 [avpu]read_reg =_ "Reg read: 0x%.4X: 0x%.8x\012"
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../ingenic-opensdk/kernel/avpu/t31/avpu_main.c:234 [avpu]wait_irq =_ "Unblocking channel\012"
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../ingenic-opensdk/kernel/avpu/t31/avpu_ip.c:128 [avpu]avpu_hardirq_handler =_ "ENOMEM: Missed interrupt\012"
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../ingenic-opensdk/kernel/avpu/t31/avpu_ip.c:117 [avpu]avpu_hardirq_handler =_ "bitfield is 0\012"
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/mnt/mips/external_utilities/OpenIPC/openingenic/kernel/sensors/t31/gc2053/gc2053.c:1860 [sensor_gc2053_t31]gc2053_probe =p "probe ok ------->gc2053\012"
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/mnt/mips/external_utilities/OpenIPC/openingenic/kernel/sensors/t31/gc2053/gc2053.c:1422 [sensor_gc2053_t31]gc2053_s_stream =p "gc2053 stream off\012"
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/mnt/mips/external_utilities/OpenIPC/openingenic/kernel/sensors/t31/gc2053/gc2053.c:1415 [sensor_gc2053_t31]gc2053_s_stream =p "gc2053 stream on\012"
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/mnt/mips/external_utilities/OpenIPC/openingenic/kernel/sensors/t31/gc2053/gc2053.c:1288 [sensor_gc2053_t31]gc2053_detect =p "-----%s: %d ret = %d, v = 0x%02x\012"
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/mnt/mips/external_utilities/OpenIPC/openingenic/kernel/sensors/t31/gc2053/gc2053.c:1282 [sensor_gc2053_t31]gc2053_detect =p "-----%s: %d ret = %d, v = 0x%02x\012"
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```
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`=_` means debugging output is `disabled`, while `=P` will indcate that debugging output is `enabled`.
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Check `dmesg` for output
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Note: Some old kernel modules may complain about missing symbols relating to dynamic debugging:
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```
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[ 4.357160] sample_core: Unknown symbol __dynamic_dev_dbg (err 1)
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[ 4.361299] sample_hal: Unknown symbol __dynamic_dev_dbg (err 1)
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```
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To resolve this, make sure you update your entire OpenIPC installation to the latest versions after 10-20-2023, or try to update the individual kernel modules experiencing issues. As a last restort, you can also disable `CONFIG_DYNAMIC_DEBUG` in your kernel config, but extensive testing has not shown this to be an issue.
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---
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#### Change sensor clock rate dynamically
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`echo "30000000" > /proc/jz/clock/cgu_cim/rate`
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This may be used to change the MCLK clockrate setting for image sensors. You can use this to get more bandwidth for higher resoluitons for FPS rates.
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---
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#### Dynamically insert or remove SDIO device
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Use these commands to enable or disable SDIO devices after the system has already booted.
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`echo "INSERT" > /sys/devices/platform/jzmmc_v1.2.X/present`
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`echo "REMOVE" > /sys/devices/platform/jzmmc_v1.2.X/present`
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Where X = the MMC device you want to control MSC0=0 MSC1=1
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---
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