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Code Issues Releases Wiki Activity

Add 5.14 patches for RPI

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Ycarus (Yannick Chabanois) 2021-10-01 16:58:58 +02:00
parent 030f2f4fd1
commit 5c593832cc
550 changed files with 224556 additions and 0 deletions
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66
root/target/linux/bcm27xx/patches-5.14/0036-tty-amba-pl011-Add-un-throttle-support.patch Normal file
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@ -0,0 +1,66 @@
From 8ef25a420f9fc4563690a93e9504587489364389 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Fri, 24 Jan 2020 11:38:28 +0000
Subject: [PATCH 036/552] 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(+)
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index d7b69db3c9ae..6978274b2dd5 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -1312,6 +1312,32 @@ static void pl011_start_tx(struct uart_port *port)
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 =
@@ -2149,6 +2175,8 @@ static const struct uart_ops amba_pl011_pops = {
.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,
--
2.33.0