i2c: designware: Allow sending restart conditions

Allow sending restart conditions upon direction change as this is
required by some chips.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stefan Roese <sr@denx.de>
Cc: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Heiko Schocher <hs@denx.de>
Reviewed-by: Heiko Schocher <hs@denxx.de>

drivers/i2c/designware_i2c.c

@@ -374,7 +374,8 @@ static void __dw_i2c_init(struct i2c_regs *i2c_base, int speed, int slaveaddr)
 	/* Disable i2c */
 	dw_i2c_enable(i2c_base, false);
 
-	writel((IC_CON_SD | IC_CON_SPD_FS | IC_CON_MM), &i2c_base->ic_con);
+	writel(IC_CON_SD | IC_CON_RE | IC_CON_SPD_FS | IC_CON_MM,
+	       &i2c_base->ic_con);
 	writel(IC_RX_TL, &i2c_base->ic_rx_tl);
 	writel(IC_TX_TL, &i2c_base->ic_tx_tl);
 	writel(IC_STOP_DET, &i2c_base->ic_intr_mask);