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c6ddf8d502
Many changes were done in drivers/pinctrl/bcm/pinctrl-bcm2835.c between
5.4.171 and 5.4.179.
The following 3 patches do not apply any more:
* target/linux/bcm27xx/patches-5.4/950-0316-pinctrl-bcm2835-Add-support-for-BCM2711-pull-up-func.patch
This was already integrated in kernel v5.4-rc1, it was never needed.
* target/linux/bcm27xx/patches-5.4/950-0328-Revert-pinctrl-bcm2835-Pass-irqchip-when-adding-gpio.patch
* target/linux/bcm27xx/patches-5.4/950-0362-pinctrl-bcm2835-Change-init-order-for-gpio-hogs.patch
I think these were done to fix the problem which was really fixed in
commit 75278f1aff5e ("pinctrl: bcm2835: Change init order for gpio
hogs") from v5.4.175
target/linux/generic/backport-5.4/716-v5.5-net-sfp-move-fwnode-parsing-into-sfp-bus-layer.patch
Move fwnode_device_is_available to the same position as in kernel 5.10.
target/linux/layerscape/patches-5.4/302-dts-0083-arm64-ls1028a-qds-correct-bus-of-rtc.patch
Applied in commit 65816c1034769e714edb70f59a33bc5472d9e55f ("arm64: dts:
ls1028a-qds: move rtc node to the correct i2c bus")
Compile-tested: lantiq/xrx200, bcm27xx/bcm2710
Run-tested: lantiq/xrx200
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
62 lines
1.9 KiB
Diff
62 lines
1.9 KiB
Diff
From a3749ee48539fa832b1832cdcae26d34e5d20f00 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Fri, 24 Jan 2020 11:38:28 +0000
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Subject: [PATCH] tty: amba-pl011: Add un/throttle support
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The PL011 driver lacks throttle and unthrottle methods. As a result,
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sending more data to the Pi than it can immediately sink while CRTSCTS
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is enabled causes a NULL pointer to be followed.
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Add a throttle handler that disables the RX interrupts, and an
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unthrottle handler that reenables them.
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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drivers/tty/serial/amba-pl011.c | 28 ++++++++++++++++++++++++++++
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1 file changed, 28 insertions(+)
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--- a/drivers/tty/serial/amba-pl011.c
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+++ b/drivers/tty/serial/amba-pl011.c
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@@ -1326,6 +1326,32 @@ static void pl011_start_tx(struct uart_p
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pl011_start_tx_pio(uap);
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}
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+static void pl011_throttle(struct uart_port *port)
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+{
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+ struct uart_amba_port *uap =
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+ container_of(port, struct uart_amba_port, port);
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+ unsigned long flags;
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+
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+ spin_lock_irqsave(&uap->port.lock, flags);
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+ uap->im &= ~(UART011_RTIM | UART011_RXIM);
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+ pl011_write(uap->im, uap, REG_IMSC);
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+ spin_unlock_irqrestore(&uap->port.lock, flags);
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+}
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+
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+static void pl011_unthrottle(struct uart_port *port)
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+{
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+ struct uart_amba_port *uap =
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+ container_of(port, struct uart_amba_port, port);
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+ unsigned long flags;
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+
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+ spin_lock_irqsave(&uap->port.lock, flags);
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+ uap->im |= UART011_RTIM;
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+ if (!pl011_dma_rx_running(uap))
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+ uap->im |= UART011_RXIM;
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+ pl011_write(uap->im, uap, REG_IMSC);
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+ spin_unlock_irqrestore(&uap->port.lock, flags);
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+}
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+
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static void pl011_stop_rx(struct uart_port *port)
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{
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struct uart_amba_port *uap =
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@@ -2150,6 +2176,8 @@ static const struct uart_ops amba_pl011_
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.stop_tx = pl011_stop_tx,
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.start_tx = pl011_start_tx,
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.stop_rx = pl011_stop_rx,
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+ .throttle = pl011_throttle,
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+ .unthrottle = pl011_unthrottle,
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.enable_ms = pl011_enable_ms,
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.break_ctl = pl011_break_ctl,
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.startup = pl011_startup,
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