diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0034-amba_pl011-Add-cts-event-workaround-DT-property.patch')
-rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0034-amba_pl011-Add-cts-event-workaround-DT-property.patch | 50 |
1 files changed, 0 insertions, 50 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0034-amba_pl011-Add-cts-event-workaround-DT-property.patch b/target/linux/bcm27xx/patches-5.4/950-0034-amba_pl011-Add-cts-event-workaround-DT-property.patch deleted file mode 100644 index df8e9aba78..0000000000 --- a/target/linux/bcm27xx/patches-5.4/950-0034-amba_pl011-Add-cts-event-workaround-DT-property.patch +++ /dev/null @@ -1,50 +0,0 @@ -From 2cb280484c8dde281972690cd67299005a796485 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.yaml | 6 ++++++ - drivers/tty/serial/amba-pl011.c | 5 +++++ - 2 files changed, 11 insertions(+) - ---- a/Documentation/devicetree/bindings/serial/pl011.yaml -+++ b/Documentation/devicetree/bindings/serial/pl011.yaml -@@ -100,6 +100,12 @@ properties: - - $ref: /schemas/types.yaml#/definitions/uint32 - - default: 3000 - -+ cts-event-workaround: -+ description: -+ Enables the (otherwise vendor-specific) workaround for the -+ CTS-induced TX lockup. -+ type: boolean -+ - required: - - compatible - - reg ---- a/drivers/tty/serial/amba-pl011.c -+++ b/drivers/tty/serial/amba-pl011.c -@@ -2665,6 +2665,11 @@ 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); |