rockchip: i2c: fix >32 byte writes

The special handling of the chip address and register address must only
happen before we send the data buffer, otherwise we will end up
inserting both of these every 32 bytes.

Signed-off-by: John Keeping <john@metanate.com>
Acked-by: Simon Glass <sjg@chromium.org>

drivers/i2c/rk_i2c.c

@@ -269,9 +269,9 @@ static int rk_i2c_write(struct rk_i2c *i2c, uchar chip, uint reg, uint r_len,
 				if ((i * 4 + j) == bytes_xferred)
 					break;
 
-				if (i == 0 && j == 0) {
+				if (i == 0 && j == 0 && pbuf == buf) {
 					txdata |= (chip << 1);
-				} else if (i == 0 && j <= r_len) {
+				} else if (i == 0 && j <= r_len && pbuf == buf) {
 					txdata |= (reg &
 						(0xff << ((j - 1) * 8))) << 8;
 				} else {