[RESEND PATCH] i2c: rk3x: Handle a spurious start completion interrupt flag

[Wolfram Sang]

> This causes I2C transfer being aborted in polled mode from a stop completion
> handler:

I wonder why this only happens in polling mode? The question behind that
is: is it really a spurious irq from the HW or is it maybe a race in the
driver? Because polling uses the same interrupt handler but just
periodically polls it.

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