[U-Boot] [PATCH] 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 ---

drivers/serial/serial_zynq.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/serial/serial_zynq.c b/drivers/serial/serial_zynq.c index e79d997cbab7..66d54e32ab38 100644 --- 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);