drivers: ti: uart: remove UART_FCR writes
This patch removes the code that touched UART_FCR, from
console_core_putc(). The check for whether transmit FIFO is
full is sufficient before writing to UART TX FIFO. In fact
setting UARTFCR_TXCLR immediately after a byte is written to
FIFO might even result in loss of that byte, if UART hasn't
sent that byte out yet.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
diff --git a/drivers/ti/uart/aarch64/16550_console.S b/drivers/ti/uart/aarch64/16550_console.S
index 489fcbe..1b9cab8 100644
--- a/drivers/ti/uart/aarch64/16550_console.S
+++ b/drivers/ti/uart/aarch64/16550_console.S
@@ -115,9 +115,6 @@
b.ne 1b
mov w2, #0xD /* '\r' */
str w2, [x1, #UARTTX]
- ldr w2, [x1, #UARTFCR]
- orr w2, w2, #UARTFCR_TXCLR
- str w2, [x1, #UARTFCR]
/* Check if the transmit FIFO is full */
2: ldr w2, [x1, #UARTLSR]
@@ -125,9 +122,6 @@
cmp w2, #(UARTLSR_TEMT | UARTLSR_THRE)
b.ne 2b
str w0, [x1, #UARTTX]
- ldr w2, [x1, #UARTFCR]
- orr w2, w2, #UARTFCR_TXCLR
- str w2, [x1, #UARTFCR]
ret
putc_error:
mov w0, #-1
