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Deleted (upstreamed): bcm27xx/patches-5.10/950-0669-drm-vc4-hdmi-Make-sure-the-device-is-powered-with-CE.patch [1] bcm27xx/patches-5.10/950-0672-drm-vc4-hdmi-Move-initial-register-read-after-pm_run.patch [1] gemini/patches-5.10/0003-ARM-dts-gemini-NAS4220-B-fis-index-block-with-128-Ki.patch [2] Manually rebased: bcm27xx/patches-5.10/950-0675-drm-vc4-hdmi-Drop-devm-interrupt-handler-for-CEC-int.patch Manually reverted: generic/pending-5.10/860-Revert-ASoC-mediatek-Check-for-error-clk-pointer.patch [3] [1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.10.94&id=55b10b88ac8654fc2f31518aa349a2e643b37f18 [2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.10.94&id=958a8819d41420d7a74ed922a09cacc0ba3a4218 [3] https://lore.kernel.org/all/trinity-2a727d96-0335-4d03-8f30-e22a0e10112d-1643363480085@3c-app-gmx-bap33/ Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com> Signed-off-by: Daniel Golle <daniel@makrotopia.org>
51 lines
1.7 KiB
Diff
51 lines
1.7 KiB
Diff
From 8ccf96729972504acf4ca0e1868278ba549e0f5a Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Fri, 29 Sep 2017 10:32:19 +0100
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Subject: [PATCH] amba_pl011: Add cts-event-workaround DT property
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The BCM2835 PL011 implementation seems to have a bug that can lead to a
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transmission lockup if CTS changes frequently. A workaround was added to
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the driver with a vendor-specific flag to enable it, but this flag is
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currently not set for ARM implementations.
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Add a "cts-event-workaround" property to Pi DTBs and use the presence
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of that property to force the flag to be enabled in the driver.
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See: https://github.com/raspberrypi/linux/issues/1280
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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Documentation/devicetree/bindings/serial/pl011.yaml | 6 ++++++
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drivers/tty/serial/amba-pl011.c | 5 +++++
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2 files changed, 11 insertions(+)
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--- a/Documentation/devicetree/bindings/serial/pl011.yaml
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+++ b/Documentation/devicetree/bindings/serial/pl011.yaml
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@@ -98,6 +98,12 @@ properties:
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$ref: /schemas/types.yaml#/definitions/uint32
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default: 3000
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+ cts-event-workaround:
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+ description:
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+ Enables the (otherwise vendor-specific) workaround for the
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+ CTS-induced TX lockup.
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+ type: boolean
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+
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required:
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- compatible
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- reg
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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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@@ -2665,6 +2665,11 @@ static int pl011_probe(struct amba_devic
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if (IS_ERR(uap->clk))
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return PTR_ERR(uap->clk);
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+ if (of_property_read_bool(dev->dev.of_node, "cts-event-workaround")) {
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+ vendor->cts_event_workaround = true;
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+ dev_info(&dev->dev, "cts_event_workaround enabled\n");
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+ }
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+
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uap->reg_offset = vendor->reg_offset;
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uap->vendor = vendor;
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uap->fifosize = vendor->get_fifosize(dev);
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