Hi
On 27 Jan 2017 3:13 p.m., "Ran Shalit" ranshalit@gmail.com wrote:
On Fri, Jan 27, 2017 at 9:08 AM, Ran Shalit ranshalit@gmail.com wrote:
On Fri, Jan 27, 2017 at 8:46 AM, Heiko Schocher hs@denx.de wrote:
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?
Yes, it's TI's dm8148 (ti81xx, ti814x)
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?
Yes, it seems to get stuck here:
if (readw (I2C_CON) & I2C_CON_EN) { <<--------- we never gets here !!!!!!!!!!!!!!!!!!!!!!!!!!! writew (0, I2C_CON);
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?
TI's DM8148. I remember that I once used that code and it works, so I quite amazed that it stopped working now. The board had some changes from that time when I tried the code, and the sw too some minor changes (i2c eerom added in bus #0), but I really don't understand why it doesn't work any more :(
It might be clock issue, I'll check.
I still don't understand what reason for it to get stuck in: if (readw (I2C_CON) & I2C_CON_EN) It's a simple register reading, Right ? So why should it hangs after calling ?
Regards, Ran
If the clock is not enable for the bus it can not work. Please check if you need to declare the i2c bus in use
Michael
bye, Heiko
Regards,
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