[U-Boot] i2c_set_bus_num freeze

[Heiko Schocher <hs@denx.de>]

Hello Ran,

Am 26.01.2017 um 18:42 schrieb Ran Shalit:
> Hello,
>
> I have some issue in u-boot trying to access bus #1.

On which hardware? Is the board in mainline?

> I can access bus #0, #2 with i2c dev 0/2
>
> I can also access bus #0,1,2 from linux.
>
> But on trying to access i2c #1 in u-boot in hangs:
>
> The function i2c_set_bus_num get stuck .
>
>
> ret = i2c_set_bus_num(1);
>
> <<------- never gets here .........
>   if (ret)
>       printf("Failure changing bus number (%d)\n", ret);
>
> It hangs in i2c_set_bus_num->i2c_init->
>
> ......
>
>      printf("i2c_init 8\n");

You see this printf?

> bus_initialized[current_bus] = 1;
> if (readw (I2C_CON) & I2C_CON_EN) {
> writew (0, I2C_CON);
> udelay (50000);
> }
>
> writew(psc, I2C_PSC);
> writew(scll, I2C_SCLL);
> writew(sclh, I2C_SCLH);
>
> /* own address */
> writew (slaveadd, I2C_OA);
> writew (I2C_CON_EN, I2C_CON);
>
>      printf("i2c_init 9\n");  <<------ never get printed ..................
>
> I have seen a similar question, yet I am doing this access after u-boot
> complete, and command prompt.
>
> Is anyone familiar with this ?

Hmm.. no reason, why the last printf should not come ...

As I do not know, on which hw ... I just can speculate ...

Is the clock for the i2c subsystem 1 in the SoC enabled?

bye,
Heiko
>
> Regards,
>
> Ran
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