diff options
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/qcom_geni_serial.c | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index d114b67be409..3e9de6c780d3 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -417,20 +417,18 @@ static void qcom_geni_serial_start_tx(struct uart_port *uport) u32 status; if (port->xfer_mode == GENI_SE_FIFO) { - status = readl_relaxed(uport->membase + SE_GENI_STATUS); + /* + * readl ensures reading & writing of IRQ_EN register + * is not re-ordered before checking the status of the + * Serial Engine. + */ + status = readl(uport->membase + SE_GENI_STATUS); if (status & M_GENI_CMD_ACTIVE) return; if (!qcom_geni_serial_tx_empty(uport)) return; - /* - * Ensure writing to IRQ_EN & watermark registers are not - * re-ordered before checking the status of the Serial - * Engine and TX FIFO - */ - mb(); - irq_en = readl_relaxed(uport->membase + SE_GENI_M_IRQ_EN); irq_en |= M_TX_FIFO_WATERMARK_EN | M_CMD_DONE_EN; @@ -894,7 +892,7 @@ out_restart_rx: static unsigned int qcom_geni_serial_tx_empty(struct uart_port *uport) { - return !readl_relaxed(uport->membase + SE_GENI_TX_FIFO_STATUS); + return !readl(uport->membase + SE_GENI_TX_FIFO_STATUS); } #ifdef CONFIG_SERIAL_QCOM_GENI_CONSOLE |