1 files changed, 9 insertions, 3 deletions

diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
index fb78bb9ad8f6..d3961014aad7 100644
--- a/drivers/acpi/acpi_lpss.c
+++ b/drivers/acpi/acpi_lpss.c
@@ -30,6 +30,7 @@ ACPI_MODULE_NAME("acpi_lpss");
 /* Offsets relative to LPSS_PRIVATE_OFFSET */
 #define LPSS_GENERAL                    0x08
 #define LPSS_GENERAL_LTR_MODE_SW        BIT(2)
+#define LPSS_GENERAL_UART_RTS_OVRD      BIT(3)
 #define LPSS_SW_LTR                     0x10
 #define LPSS_AUTO_LTR                   0x14
 #define LPSS_TX_INT                     0x20
@@ -68,11 +69,16 @@ struct lpss_private_data {
 
 static void lpss_uart_setup(struct lpss_private_data *pdata)
 {
-        unsigned int tx_int_offset = pdata->dev_desc->prv_offset + LPSS_TX_INT;
+        unsigned int offset;
         u32 reg;
 
-        reg = readl(pdata->mmio_base + tx_int_offset);
-        writel(reg | LPSS_TX_INT_MASK, pdata->mmio_base + tx_int_offset);
+        offset = pdata->dev_desc->prv_offset + LPSS_TX_INT;
+        reg = readl(pdata->mmio_base + offset);
+        writel(reg | LPSS_TX_INT_MASK, pdata->mmio_base + offset);
+
+        offset = pdata->dev_desc->prv_offset + LPSS_GENERAL;
+        reg = readl(pdata->mmio_base + offset);
+        writel(reg | LPSS_GENERAL_UART_RTS_OVRD, pdata->mmio_base + offset);
 }
 
 static struct lpss_device_desc lpt_dev_desc = {