From 181211fdc6bdb1b4cb766b80355eb38c6c978003 Mon Sep 17 00:00:00 2001 From: Peter Robinson Date: Sun, 22 Apr 2018 19:41:13 +0100 Subject: [PATCH] Add quirk patch to fix X-Gene 1 console on HP m400/Mustang (RHBZ 1531140) --- ...x-regression-related-to-X-Gene-UARTs.patch | 44 +++++++++++++++++++ kernel.spec | 6 +++ 2 files changed, 50 insertions(+) create mode 100644 ACPI-scan-Fix-regression-related-to-X-Gene-UARTs.patch diff --git a/ACPI-scan-Fix-regression-related-to-X-Gene-UARTs.patch b/ACPI-scan-Fix-regression-related-to-X-Gene-UARTs.patch new file mode 100644 index 000000000..56baf5ec6 --- /dev/null +++ b/ACPI-scan-Fix-regression-related-to-X-Gene-UARTs.patch @@ -0,0 +1,44 @@ +From patchwork Fri Apr 20 03:29:47 2018 +Content-Type: text/plain; charset="utf-8" +MIME-Version: 1.0 +Content-Transfer-Encoding: 7bit +Subject: ACPI / scan: Fix regression related to X-Gene UARTs +From: Mark Salter +X-Patchwork-Id: 10351797 +Message-Id: <20180420032947.23023-1-msalter@redhat.com> +To: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20Danis?= +Cc: "Rafael J . Wysocki" , + linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org +Date: Thu, 19 Apr 2018 23:29:47 -0400 + +Commit e361d1f85855 ("ACPI / scan: Fix enumeration for special UART +devices") caused a regression with some X-Gene based platforms (Mustang +and M400) with invalid DSDT. The DSDT makes it appear that the UART +device is also a slave device attached to itself. With the above commit +the UART won't be enumerated by ACPI scan (slave serial devices shouldn't +be). So check for X-Gene UART device and skip slace device check on it. + +Signed-off-by: Mark Salter +--- + drivers/acpi/scan.c | 8 ++++++++ + 1 file changed, 8 insertions(+) + +diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c +index cc234e6a6297..1dcdd0122862 100644 +--- a/drivers/acpi/scan.c ++++ b/drivers/acpi/scan.c +@@ -1551,6 +1551,14 @@ static bool acpi_device_enumeration_by_parent(struct acpi_device *device) + fwnode_property_present(&device->fwnode, "baud"))) + return true; + ++ /* ++ * Firmware on some arm64 X-Gene platforms will make the UART ++ * device appear as both a UART and a slave of that UART. Just ++ * bail out here for X-Gene UARTs. ++ */ ++ if (!strcmp(acpi_device_hid(device), "APMC0D08")) ++ return false; ++ + INIT_LIST_HEAD(&resource_list); + acpi_dev_get_resources(device, &resource_list, + acpi_check_serial_bus_slave, diff --git a/kernel.spec b/kernel.spec index 1764739dd..a328cfbb4 100644 --- a/kernel.spec +++ b/kernel.spec @@ -580,6 +580,9 @@ Patch303: qcom-msm89xx-fixes.patch # https://patchwork.kernel.org/patch/10173115/ Patch304: arm-dts-imx6qdl-udoo-Disable-usbh1-to-avoid-kernel-hang.patch +# https://patchwork.kernel.org/patch/10351797/ +Patch305: ACPI-scan-Fix-regression-related-to-X-Gene-UARTs.patch + # https://marc.info/?l=linux-kernel&m=152328880417846&w=2 Patch308: arm64-thunderx-crypto-zip-fixes.patch @@ -1869,6 +1872,9 @@ fi # # %changelog +* Sun Apr 22 2018 Peter Robinson +- Add quirk patch to fix X-Gene 1 console on HP m400/Mustang (RHBZ 1531140) + * Fri Apr 20 2018 Justin M. Forbes - 4.17.0-0.rc1.git3.1 - Linux v4.17-rc1-93-g43f70c960180