serial_msm: Enable RS232 flow control

SE HMIBSC board debug console requires RS232 flow control, so enable
corresponding support if RS232 gpios are present.

Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org>
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>

diff --git a/drivers/serial/serial_msm.c b/drivers/serial/serial_msm.c
index 06a948a2f643fdc635990ed9f793758787003d72..a472e0b3683399cfe6035595f6786254725b6fa7 100644 (file)
--- a/drivers/serial/serial_msm.c
+++ b/drivers/serial/serial_msm.c
@@ -63,9 +63,10 @@
 #define UARTDM_TF               0x100 /* UART Transmit FIFO register */
 #define UARTDM_RF               0x140 /* UART Receive FIFO register */
 
-#define MSM_BOOT_UART_DM_8_N_1_MODE 0x34
-#define MSM_BOOT_UART_DM_CMD_RESET_RX 0x10
-#define MSM_BOOT_UART_DM_CMD_RESET_TX 0x20
+#define MSM_BOOT_UART_DM_8_N_1_MODE    0x34
+#define MSM_BOOT_UART_DM_CMD_RESET_RX  0x10
+#define MSM_BOOT_UART_DM_CMD_RESET_TX  0x20
+#define MSM_UART_MR1_RX_RDY_CTL                BIT(7)
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -220,7 +221,8 @@ static void uart_dm_init(struct msm_serial_data *priv)
        }
 
        writel(bitrate, priv->base + UARTDM_CSR);
-       writel(0x0, priv->base + UARTDM_MR1);
+       /* Enable RS232 flow control to support RS232 db9 connector */
+       writel(MSM_UART_MR1_RX_RDY_CTL, priv->base + UARTDM_MR1);
        writel(MSM_BOOT_UART_DM_8_N_1_MODE, priv->base + UARTDM_MR2);
        writel(MSM_BOOT_UART_DM_CMD_RESET_RX, priv->base + UARTDM_CR);
        writel(MSM_BOOT_UART_DM_CMD_RESET_TX, priv->base + UARTDM_CR);