Hi,
the driver logs this kind of annoying messages:
Jan 14 04:10:48 raspberrypi kernel: [54876.751957] mcp251xfd spi6.0 can1: CRC read error at address 0x0010 (length=4, data=00 4b 01 00, CRC=0xe146) retrying.
Unless DEBUG is active, I don't think that it is justified to print every single
SPI CRC issue in detail to the logs:
- The errors are due to chip errata
- You cannot deduct that you have software/hardware issue from those errors
- As you do not know how the data should have been, you cant do
diagnostic (single-bit vs multi-bit errors or the like)
So far I have only seen these errors for access to register 0x0010 and
rarely for 0x0000, probably because those registers have dynamic content.
Nevertheless, diagnostic for SPI CRC errors might still be useful. I suggest to add
driver proprietary static counters in /sys for that:
.../can0/spi_crc_dynamic_data (for 0x000, 0x0010) to avoid the word "expected"
.../can0/spi_crc_static_data (for all others)
-----
Stefan
