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[TG3]: Refine DMA boundary setting.
Extract DMA boundary bit selection into a seperate function, tg3_calc_dma_bndry(). Call this from tg3_test_dma(). Make DMA test more reliable by using no DMA boundry setting during the test. If the test passes, then use the setting we selected before the test. Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Michael Chan <mchan@broadcom.com>
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