i2c: mxs_i2c: Squash endless loop

The endless waiting for a bit to be set can cause a hang, add a timeout
so we prevent such situation. A testcase for such a hang is below. The
testcase assumes a device to be present at address 0x50 and a device to
NOT be present at address 0x42 . Also note that the "sleep 1" induced
delays are imperative for this bug to manifest .

i2c read 0x42 0x0.2 0x10 0x42000000 ; sleep 1 ; \
i2c read 0x50 0x0.2 0x10 0x42000000 ; sleep 1 ; \
i2c read 0x42 0x0.2 0x10 0x42000000

The expected result of the above command is:

Error reading the chip.
Error reading the chip.

While without this patch, we observe a hang in the last read from 0x42
precisely when waiting for this bit to be set.

Signed-off-by: Marek Vasut <[email protected]>
Cc: Fabio Estevam <[email protected]>
Cc: Heiko Schocher <[email protected]>
Cc: Stefano Babic <[email protected]>

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