From aea2f721051037ea673a726856bcc15ecebf2389 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Pali=20Roh=C3=A1r?= Date: Thu, 14 Jan 2021 15:46:35 +0100 Subject: [PATCH] serial: a3720: Implement pending method for output direction MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit To check if some output characters are waiting either in Transmitter Holding Register or Transmitter Shift Register we need to look at TX_EMPTY bit of UART Status Register. Signed-off-by: Pali Rohár Reviewed-by: Stefan Roese --- drivers/serial/serial_mvebu_a3700.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/serial/serial_mvebu_a3700.c b/drivers/serial/serial_mvebu_a3700.c index 5a1d40e0a6..8f404879a5 100644 --- a/drivers/serial/serial_mvebu_a3700.c +++ b/drivers/serial/serial_mvebu_a3700.c @@ -23,6 +23,7 @@ struct mvebu_plat { #define UART_POSSR_REG 0x14 #define UART_STATUS_RX_RDY 0x10 +#define UART_STATUS_TX_EMPTY 0x40 #define UART_STATUS_TXFIFO_FULL 0x800 #define UART_CTRL_RXFIFO_RESET 0x4000 @@ -59,8 +60,13 @@ static int mvebu_serial_pending(struct udevice *dev, bool input) struct mvebu_plat *plat = dev_get_plat(dev); void __iomem *base = plat->base; - if (readl(base + UART_STATUS_REG) & UART_STATUS_RX_RDY) - return 1; + if (input) { + if (readl(base + UART_STATUS_REG) & UART_STATUS_RX_RDY) + return 1; + } else { + if (!(readl(base + UART_STATUS_REG) & UART_STATUS_TX_EMPTY)) + return 1; + } return 0; } -- 2.39.5