[i2c] [PATCH] Is review of AT91 patch pending?

Jean Delvare khali at linux-fr.org
Fri Oct 19 12:16:33 CEST 2007


Hi Aras,

On Fri, 19 Oct 2007 10:13:30 +1000, Aras Vaichas wrote:
> Results for your i2c-at91 driver:
> 
> (*) At 10KHz, 256 pass, 0 fail
> (*) At 50KHz, 256 pass, 0 fail
> (*) At 75KHz, 255 pass, 1 fail
> (*) At 100KHz, 252 pass, 4 fail
> (*) At 150KHz, 1024 pass, 4 fail
> (*) At 200KHz,  1024 pass, 6 fail
> 
> Same tests again, but with CPU heavily loaded using the "stress" application:
> 
> (*) At 10KHz, 256 pass, 0 fail
> (*) At 50KHz, 256 pass, 0 fail
> (*) At 75KHz, 255 pass, 0 fail
> (*) At 100KHz, 8800 pass, 34 fail (overnight test)
> (*) At 150KHz, 380 pass, 70 fail
> (*) At 200KHz, 54 pass, 20 fail

Is your EEPROM specified for frequencies above 100 kHz at all?

(Not to suggest that the AT91 I2C bus controller isn't broken, we all
know it is, but to be fair you shouldn't test speeds not officially
supported by your I2C chips.)

-- 
Jean Delvare



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