Can someone help me on an issue I am seeing on my i2c-imx driver for uClinux 2.6.29? Attached is a scope capture of an i2c read operation. In the capture, yellow is clock, green is data, blue and pink are both gpios I am using for debugging. It can be seen that there is a 300 us delay after master writes to the slave address. The transfer is complete when the interrupt arrives and waitqueue is woken up. The pink gpio fires high during the transfer complete call (i2c_imx_trx_complete) after the slave address is written. The blue gpio fires high during the queue wake up call in the ISR (i2c_imx_isr). When looking at this capture, my first inclination is to bump the interrupt level and priority, hoping it will speed up the ISR but it had no effect on the delay. Any ideas what is causing this delay? Thanks, Priscilla
<<attachment: scope_14.png>>
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