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i2c: bcm2835: Clear the clock stretching timeout at boot.
The register at poweron contains 0x40, which at our typical 100khz bus rate means .64ms. There is no specified limit to how long devices should be able to stretch the clocks, so just disable the timeout. We still have a timeout wrapping the entire transfer. Signed-off-by: Eric Anholt <firstname.lastname@example.org>
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