[PATCH v3 3/6] serial_msm: Enable RS232 flow control

[Sumit Garg]

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

Reviewed-by: Caleb Connolly <caleb.conno...@linaro.org>
Signed-off-by: Sumit Garg <sumit.g...@linaro.org>
---
 drivers/serial/serial_msm.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/serial/serial_msm.c b/drivers/serial/serial_msm.c
index 4de10e75191..3142ecf7362 100644
--- a/drivers/serial/serial_msm.c
+++ b/drivers/serial/serial_msm.c
@@ -53,10 +53,11 @@
 #define UARTDM_TF               0x100 /* UART Transmit FIFO register */
 #define UARTDM_RF               0x140 /* UART Receive FIFO register */
 
-#define UART_DM_CLK_RX_TX_BIT_RATE 0xCC
-#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 UART_DM_CLK_RX_TX_BIT_RATE     0xCC
+#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;
 
@@ -182,7 +183,9 @@ static void uart_dm_init(struct msm_serial_data *priv)
        mdelay(5);
 
        writel(priv->clk_bit_rate, 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);
-- 
2.34.1