i2c: rcar: wait for data empty before starting DMA

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When sending with DMA, the driver transfers the first byte with PIO (as
documented). However, it started DMA right after the first byte was
written. This worked, but was not according to the datasheet which
suggests to wait until data register was empty again. Implement this.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

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Wolfram Sang 2019-03-05 18:54:34 +01:00 • committed by Wolfram Sang

parent 03f85e380f

commit 94e290b0e9

1 changed files with 4 additions and 7 deletions

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11

drivers/i2c/busses/i2c-rcar.c

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