1 files changed, 26 insertions, 14 deletions

diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 094f2958cb2b..74089f5e5b53 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -364,7 +364,13 @@ static irqreturn_t cdns_uart_isr(int irq, void *dev_id)
 		cdns_uart_handle_tx(dev_id);
 		isrstatus &= ~CDNS_UART_IXR_TXEMPTY;
 	}
-	if (isrstatus & CDNS_UART_IXR_RXMASK)
+
+	/*
+	 * Skip RX processing if RX is disabled as RXEMPTY will never be set
+	 * as read bytes will not be removed from the FIFO.
+	 */
+	if (isrstatus & CDNS_UART_IXR_RXMASK &&
+	    !(readl(port->membase + CDNS_UART_CR) & CDNS_UART_CR_RX_DIS))
 		cdns_uart_handle_rx(dev_id, isrstatus);
 
 	spin_unlock(&port->lock);
@@ -1547,27 +1553,33 @@ static int cdns_uart_probe(struct platform_device *pdev)
 	}
 
 	cdns_uart_data->pclk = devm_clk_get(&pdev->dev, "pclk");
+	if (PTR_ERR(cdns_uart_data->pclk) == -EPROBE_DEFER) {
+		rc = PTR_ERR(cdns_uart_data->pclk);
+		goto err_out_unregister_driver;
+	}
+
 	if (IS_ERR(cdns_uart_data->pclk)) {
 		cdns_uart_data->pclk = devm_clk_get(&pdev->dev, "aper_clk");
-		if (!IS_ERR(cdns_uart_data->pclk))
-			dev_err(&pdev->dev, "clock name 'aper_clk' is deprecated.\n");
+		if (IS_ERR(cdns_uart_data->pclk)) {
+			rc = PTR_ERR(cdns_uart_data->pclk);
+			goto err_out_unregister_driver;
+		}
+		dev_err(&pdev->dev, "clock name 'aper_clk' is deprecated.\n");
 	}
-	if (IS_ERR(cdns_uart_data->pclk)) {
-		dev_err(&pdev->dev, "pclk clock not found.\n");
-		rc = PTR_ERR(cdns_uart_data->pclk);
+
+	cdns_uart_data->uartclk = devm_clk_get(&pdev->dev, "uart_clk");
+	if (PTR_ERR(cdns_uart_data->uartclk) == -EPROBE_DEFER) {
+		rc = PTR_ERR(cdns_uart_data->uartclk);
 		goto err_out_unregister_driver;
 	}
 
-	cdns_uart_data->uartclk = devm_clk_get(&pdev->dev, "uart_clk");
 	if (IS_ERR(cdns_uart_data->uartclk)) {
 		cdns_uart_data->uartclk = devm_clk_get(&pdev->dev, "ref_clk");
-		if (!IS_ERR(cdns_uart_data->uartclk))
-			dev_err(&pdev->dev, "clock name 'ref_clk' is deprecated.\n");
-	}
-	if (IS_ERR(cdns_uart_data->uartclk)) {
-		dev_err(&pdev->dev, "uart_clk clock not found.\n");
-		rc = PTR_ERR(cdns_uart_data->uartclk);
-		goto err_out_unregister_driver;
+		if (IS_ERR(cdns_uart_data->uartclk)) {
+			rc = PTR_ERR(cdns_uart_data->uartclk);
+			goto err_out_unregister_driver;
+		}
+		dev_err(&pdev->dev, "clock name 'ref_clk' is deprecated.\n");
 	}
 
 	rc = clk_prepare_enable(cdns_uart_data->pclk);