diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0036-amba_pl011-Add-cts-event-workaround-DT-property.patch')
-rw-r--r-- | target/linux/brcm2708/patches-4.19/950-0036-amba_pl011-Add-cts-event-workaround-DT-property.patch | 47 |
1 files changed, 0 insertions, 47 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0036-amba_pl011-Add-cts-event-workaround-DT-property.patch b/target/linux/brcm2708/patches-4.19/950-0036-amba_pl011-Add-cts-event-workaround-DT-property.patch deleted file mode 100644 index d7514a5525..0000000000 --- a/target/linux/brcm2708/patches-4.19/950-0036-amba_pl011-Add-cts-event-workaround-DT-property.patch +++ /dev/null @@ -1,47 +0,0 @@ -From 17a4507175ca6018ea40e91c9d753bc39f043d99 Mon Sep 17 00:00:00 2001 -From: Phil Elwell <phil@raspberrypi.org> -Date: Fri, 29 Sep 2017 10:32:19 +0100 -Subject: [PATCH] amba_pl011: Add cts-event-workaround DT property - -The BCM2835 PL011 implementation seems to have a bug that can lead to a -transmission lockup if CTS changes frequently. A workaround was added to -the driver with a vendor-specific flag to enable it, but this flag is -currently not set for ARM implementations. - -Add a "cts-event-workaround" property to Pi DTBs and use the presence -of that property to force the flag to be enabled in the driver. - -See: https://github.com/raspberrypi/linux/issues/1280 - -Signed-off-by: Phil Elwell <phil@raspberrypi.org> ---- - Documentation/devicetree/bindings/serial/pl011.txt | 3 +++ - drivers/tty/serial/amba-pl011.c | 5 +++++ - 2 files changed, 8 insertions(+) - ---- a/Documentation/devicetree/bindings/serial/pl011.txt -+++ b/Documentation/devicetree/bindings/serial/pl011.txt -@@ -35,6 +35,9 @@ Optional properties: - - poll-timeout-ms: - Poll timeout when auto-poll is set, default - 3000ms. -+- cts-event-workaround: -+ Enables the (otherwise vendor-specific) workaround for the -+ CTS-induced TX lockup. - - See also bindings/arm/primecell.txt - ---- a/drivers/tty/serial/amba-pl011.c -+++ b/drivers/tty/serial/amba-pl011.c -@@ -2659,6 +2659,11 @@ static int pl011_probe(struct amba_devic - if (IS_ERR(uap->clk)) - return PTR_ERR(uap->clk); - -+ if (of_property_read_bool(dev->dev.of_node, "cts-event-workaround")) { -+ vendor->cts_event_workaround = true; -+ dev_info(&dev->dev, "cts_event_workaround enabled\n"); -+ } -+ - uap->reg_offset = vendor->reg_offset; - uap->vendor = vendor; - uap->fifosize = vendor->get_fifosize(dev); |