serial: zynq: Change logic in putc

Sync logic with Linux kernel where TX empty flag is checked before char
is sent.
This logic is fixing problem with console on zynqmp platform.

For example:
DRAM:  2 GiB
Enabling Caches...
EL Level:	��   sdhci@ff170000: 0
Using default environment

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Moritz Fischer <moritz.fischer@ettus.com>

diff --git a/drivers/serial/serial_zynq.c b/drivers/serial/serial_zynq.c
index e79d997cbab722580f2c8c2876a7f518577a1f41..66d54e32ab3884df382ba452889d686236dc1fdf 100644 (file)
--- a/drivers/serial/serial_zynq.c
+++ b/drivers/serial/serial_zynq.c
@@ -19,7 +19,7 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-#define ZYNQ_UART_SR_TXFULL    0x00000010 /* TX FIFO full */
+#define ZYNQ_UART_SR_TXEMPTY   (1 << 3) /* TX FIFO empty */
 #define ZYNQ_UART_SR_TXACTIVE  (1 << 11)  /* TX active */
 #define ZYNQ_UART_SR_RXEMPTY   0x00000002 /* RX FIFO empty */
 
@@ -97,7 +97,7 @@ static void _uart_zynq_serial_init(struct uart_zynq *regs)
 
 static int _uart_zynq_serial_putc(struct uart_zynq *regs, const char c)
 {
-       if (readl(&regs->channel_sts) & ZYNQ_UART_SR_TXFULL)
+       if (!(readl(&regs->channel_sts) & ZYNQ_UART_SR_TXEMPTY))
                return -EAGAIN;
 
        writel(c, &regs->tx_rx_fifo);