[PATCH 1/4] power: regulator: Trigger probe of regulators which are always-on or boot-on

[Jonas Karlman]

On 2024-09-25 12:18, Svyatoslav Ryhel wrote:
> Hello there!
> I was digging this when I had some free time and found that with
> patches from Marek the only difference is that function
> i2c_get_chip_for_busnum is not called for PMIC's main i2c address
> which results in issues with i2c you have seen in logs before. I
> assume this is not a tegra specific issue and not even related to
> these regulator patches itself.

The i2c_get_chip_for_busnum call is typically protected by
CONFIG_IS_ENABLED(DM_I2C), do you have DM_I2C and SPL_DM_I2C enabled?

grep DM_I2C .config

> 
> To verify my suspicions, Tom and Marek my you please dump u-boot log
> with and without patches and with enabled debug logging from
> i2c-uclass and i2c driver of your SoC.
> 
> Here are logs from my device (Tegra SoC)

What board target / defconfig is used? Would like to understand what
bootph- props are used in the built control fdt.

> 
> Not working
> (bootloader) i2c: controller bus 0 at 7000d000, speed 0:
> i2c_init_controller: speed=400000
> (bootloader) i2c_init_controller: CLK_DIV_STD_FAST_MODE setting = 25
> (bootloader) i2c_get_chip: Searching bus 'i2c at 7000d000' for address 59:
> (bootloader) not found
> (bootloader) pmic_reg_read: reg=37 priv->trans_len:1i2c_xfer: 2 messages
> (bootloader)
> (bootloader) i2c_xfer: chip=0x58, len=0x1
> (bootloader) i2c_write_data: chip=0x58, len=0x1
> (bootloader) write_data:  0x37
> (bootloader) pkt header 1 sent (0x10010)
> (bootloader) pkt header 2 sent (0x0)
> (bootloader) pkt header 3 sent (0x100b0)
> (bootloader) pkt data sent (0x37)
> (bootloader) tegra_i2c_write_data: Error (-1) !!!

Is this at SPL, U-Boot pre-reloc or after relocation? A more complete
boot log may help us understand when this happens.

> 
> Working
> (bootloader) i2c: controller bus 0 at 7000d000, speed 0:
> i2c_init_controller: speed=400000
> (bootloader) i2c_init_controller: CLK_DIV_STD_FAST_MODE setting = 25
> (bootloader) pkt header 1 sent (0x10010)
> (bootloader) pkt header 2 sent (0x0)
> (bootloader) pkt header 3 sent (0xb0)
> (bootloader) pkt data sent (0x0)
> (bootloader) i2c_get_chip: Searching bus 'i2c at 7000d000' for address 58:
> (bootloader) i2c_get_chip: Searching bus 'i2c at 7000d000' for address 59:
> (bootloader) not found
> (bootloader) found, ret=0
> (bootloader) i2c_xfer: 2 messages
> (bootloader) i2c_xfer: chip=0x58, len=0x1
> (bootloader) i2c_write_data: chip=0x58, len=0x1
> (bootloader) write_data:  0xfb
> (bootloader) pkt header 1 sent (0x10010)
> (bootloader) pkt header 2 sent (0x0)
> (bootloader) pkt header 3 sent (0x100b0)
> (bootloader) pkt data sent (0xfb)
> (bootloader) i2c_xfer: chip=0x58, len=0x1

Is the working scenario happening at same call site as not working?

Try with #define LOG_DEBUG in lib/initcall.c and compare/include a
longer part of the boot log.

Regards,
Jonas

> 
> As you can see this part
> 
> (bootloader) pkt header 1 sent (0x10010)
> (bootloader) pkt header 2 sent (0x0)
> (bootloader) pkt header 3 sent (0xb0)
> (bootloader) pkt data sent (0x0)
> (bootloader) i2c_get_chip: Searching bus 'i2c at 7000d000' for address 58:
> 
> is missing in log from u-boot where Marek's patches are applied and
> this log fragment co-responds to i2c_get_chip_for_busnum call