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| author | Peter Robinson <pbrobinson@gmail.com> | 2018-04-22 19:41:13 +0100 |
|---|---|---|
| committer | Peter Robinson <pbrobinson@gmail.com> | 2018-04-22 19:41:13 +0100 |
| commit | 181211fdc6bdb1b4cb766b80355eb38c6c978003 (patch) | |
| tree | e9f2cebd271acffaf1aaba2c83c95f3373fb6b77 /ACPI-scan-Fix-regression-related-to-X-Gene-UARTs.patch | |
| parent | 1d50bf778827dcd6c27f5f5edd734e91dc01761a (diff) | |
| download | kernel-181211fdc6bdb1b4cb766b80355eb38c6c978003.tar.gz kernel-181211fdc6bdb1b4cb766b80355eb38c6c978003.tar.xz kernel-181211fdc6bdb1b4cb766b80355eb38c6c978003.zip | |
Add quirk patch to fix X-Gene 1 console on HP m400/Mustang (RHBZ 1531140)
Diffstat (limited to 'ACPI-scan-Fix-regression-related-to-X-Gene-UARTs.patch')
| -rw-r--r-- | ACPI-scan-Fix-regression-related-to-X-Gene-UARTs.patch | 44 |
1 files changed, 44 insertions, 0 deletions
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 <msalter@redhat.com> +X-Patchwork-Id: 10351797 +Message-Id: <20180420032947.23023-1-msalter@redhat.com> +To: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20Danis?= <frederic.danis.oss@gmail.com> +Cc: "Rafael J . Wysocki" <rjw@rjwysocki.net>, + 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 <msalter@redhat.com> +--- + 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, |