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serial: zynq: Change logic in putc

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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>
This commit is contained in:
Michal Simek 2016-02-03 15:16:51 +01:00
parent d82d63cc9b
commit 6cd0f2a6cd
1 changed files with 2 additions and 2 deletions
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4
drivers/serial/serial_zynq.c
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@ -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);