diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-4.19/950-0795-tty-amba-pl011-Add-un-throttle-support.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-4.19/950-0795-tty-amba-pl011-Add-un-throttle-support.patch | 61 |
1 files changed, 0 insertions, 61 deletions
diff --git a/target/linux/bcm27xx/patches-4.19/950-0795-tty-amba-pl011-Add-un-throttle-support.patch b/target/linux/bcm27xx/patches-4.19/950-0795-tty-amba-pl011-Add-un-throttle-support.patch deleted file mode 100644 index 0ab6cf2fe9..0000000000 --- a/target/linux/bcm27xx/patches-4.19/950-0795-tty-amba-pl011-Add-un-throttle-support.patch +++ /dev/null @@ -1,61 +0,0 @@ -From d4f4b57c667141ca98711cfcb30ae2b8deb1a034 Mon Sep 17 00:00:00 2001 -From: Phil Elwell <phil@raspberrypi.org> -Date: Fri, 24 Jan 2020 11:38:28 +0000 -Subject: [PATCH] tty: amba-pl011: Add un/throttle support - -The PL011 driver lacks throttle and unthrottle methods. As a result, -sending more data to the Pi than it can immediately sink while CRTSCTS -is enabled causes a NULL pointer to be followed. - -Add a throttle handler that disables the RX interrupts, and an -unthrottle handler that reenables them. - -Signed-off-by: Phil Elwell <phil@raspberrypi.org> ---- - drivers/tty/serial/amba-pl011.c | 28 ++++++++++++++++++++++++++++ - 1 file changed, 28 insertions(+) - ---- a/drivers/tty/serial/amba-pl011.c -+++ b/drivers/tty/serial/amba-pl011.c -@@ -1323,6 +1323,32 @@ static void pl011_start_tx(struct uart_p - pl011_start_tx_pio(uap); - } - -+static void pl011_throttle(struct uart_port *port) -+{ -+ struct uart_amba_port *uap = -+ container_of(port, struct uart_amba_port, port); -+ unsigned long flags; -+ -+ spin_lock_irqsave(&uap->port.lock, flags); -+ uap->im &= ~(UART011_RTIM | UART011_RXIM); -+ pl011_write(uap->im, uap, REG_IMSC); -+ spin_unlock_irqrestore(&uap->port.lock, flags); -+} -+ -+static void pl011_unthrottle(struct uart_port *port) -+{ -+ struct uart_amba_port *uap = -+ container_of(port, struct uart_amba_port, port); -+ unsigned long flags; -+ -+ spin_lock_irqsave(&uap->port.lock, flags); -+ uap->im |= UART011_RTIM; -+ if (!pl011_dma_rx_running(uap)) -+ uap->im |= UART011_RXIM; -+ pl011_write(uap->im, uap, REG_IMSC); -+ spin_unlock_irqrestore(&uap->port.lock, flags); -+} -+ - static void pl011_stop_rx(struct uart_port *port) - { - struct uart_amba_port *uap = -@@ -2165,6 +2191,8 @@ static const struct uart_ops amba_pl011_ - .stop_tx = pl011_stop_tx, - .start_tx = pl011_start_tx, - .stop_rx = pl011_stop_rx, -+ .throttle = pl011_throttle, -+ .unthrottle = pl011_unthrottle, - .enable_ms = pl011_enable_ms, - .break_ctl = pl011_break_ctl, - .startup = pl011_startup, |