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-rw-r--r-- | extra/linux-pae/0003-ACPI-watchdog-Prefer-iTCO_wdt-always-when-WDAT-table.patch | 132 |
diff --git a/extra/linux-pae/0003-ACPI-watchdog-Prefer-iTCO_wdt-always-when-WDAT-table.patch b/extra/linux-pae/0003-ACPI-watchdog-Prefer-iTCO_wdt-always-when-WDAT-table.patch deleted file mode 100644 index b4db2ad3..00000000 --- a/extra/linux-pae/0003-ACPI-watchdog-Prefer-iTCO_wdt-always-when-WDAT-table.patch +++ /dev/null @@ -1,132 +0,0 @@ -From 1e45a10dbea00f3a9ead21a9b3d25ad00021261d Mon Sep 17 00:00:00 2001 -Message-Id: <1e45a10dbea00f3a9ead21a9b3d25ad00021261d.1528777685.git.jan.steffens@gmail.com> -In-Reply-To: <9a5adbc45b1c7d43fe4b27936f2a6939660617a1.1528777685.git.jan.steffens@gmail.com> -References: <9a5adbc45b1c7d43fe4b27936f2a6939660617a1.1528777685.git.jan.steffens@gmail.com> -From: Mika Westerberg <mika.westerberg@linux.intel.com> -Date: Tue, 22 May 2018 14:16:50 +0300 -Subject: [PATCH 3/3] ACPI / watchdog: Prefer iTCO_wdt always when WDAT table - uses RTC SRAM - -After we added quirk for Lenovo Z50-70 it turns out there are at least -two more systems where WDAT table includes instructions accessing RTC -SRAM. Instead of quirking each system separately, look for such -instructions in the table and automatically prefer iTCO_wdt if found. - -Link: https://bugzilla.kernel.org/show_bug.cgi?id=199033 -Reported-by: Arnold Guy <aurnoldg@gmail.com> -Reported-by: Alois Nespor <nespor@fssp.cz> -Reported-by: Yury Pakin <zxwarior@gmail.com> -Reported-by: Ihor Chyhin <ihorchyhin@ukr.net> -Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> -Acked-by: Guenter Roeck <linux@roeck-us.net> ---- - drivers/acpi/acpi_watchdog.c | 72 ++++++++++++++++++++++-------------- - 1 file changed, 45 insertions(+), 27 deletions(-) - -diff --git a/drivers/acpi/acpi_watchdog.c b/drivers/acpi/acpi_watchdog.c -index 4bde16fb97d8..95600309ce42 100644 ---- a/drivers/acpi/acpi_watchdog.c -+++ b/drivers/acpi/acpi_watchdog.c -@@ -12,54 +12,72 @@ - #define pr_fmt(fmt) "ACPI: watchdog: " fmt - - #include <linux/acpi.h> --#include <linux/dmi.h> - #include <linux/ioport.h> - #include <linux/platform_device.h> - - #include "internal.h" - --static const struct dmi_system_id acpi_watchdog_skip[] = { -- { -- /* -- * On Lenovo Z50-70 there are two issues with the WDAT -- * table. First some of the instructions use RTC SRAM -- * to store persistent information. This does not work well -- * with Linux RTC driver. Second, more important thing is -- * that the instructions do not actually reset the system. -- * -- * On this particular system iTCO_wdt seems to work just -- * fine so we prefer that over WDAT for now. -- * -- * See also https://bugzilla.kernel.org/show_bug.cgi?id=199033. -- */ -- .ident = "Lenovo Z50-70", -- .matches = { -- DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), -- DMI_MATCH(DMI_PRODUCT_NAME, "20354"), -- DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Z50-70"), -- }, -- }, -- {} --}; -+#ifdef CONFIG_RTC_MC146818_LIB -+#include <linux/mc146818rtc.h> -+ -+/* -+ * There are several systems where the WDAT table is accessing RTC SRAM to -+ * store persistent information. This does not work well with the Linux RTC -+ * driver so on those systems we skip WDAT driver and prefer iTCO_wdt -+ * instead. -+ * -+ * See also https://bugzilla.kernel.org/show_bug.cgi?id=199033. -+ */ -+static bool acpi_watchdog_uses_rtc(const struct acpi_table_wdat *wdat) -+{ -+ const struct acpi_wdat_entry *entries; -+ int i; -+ -+ entries = (struct acpi_wdat_entry *)(wdat + 1); -+ for (i = 0; i < wdat->entries; i++) { -+ const struct acpi_generic_address *gas; -+ -+ gas = &entries[i].register_region; -+ if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO) { -+ switch (gas->address) { -+ case RTC_PORT(0): -+ case RTC_PORT(1): -+ case RTC_PORT(2): -+ case RTC_PORT(3): -+ return true; -+ } -+ } -+ } -+ -+ return false; -+} -+#else -+static bool acpi_watchdog_uses_rtc(const struct acpi_table_wdat *wdat) -+{ -+ return false; -+} -+#endif - - static const struct acpi_table_wdat *acpi_watchdog_get_wdat(void) - { - const struct acpi_table_wdat *wdat = NULL; - acpi_status status; - - if (acpi_disabled) - return NULL; - -- if (dmi_check_system(acpi_watchdog_skip)) -- return NULL; -- - status = acpi_get_table(ACPI_SIG_WDAT, 0, - (struct acpi_table_header **)&wdat); - if (ACPI_FAILURE(status)) { - /* It is fine if there is no WDAT */ - return NULL; - } - -+ if (acpi_watchdog_uses_rtc(wdat)) { -+ pr_info("Skipping WDAT on this system because it uses RTC SRAM\n"); -+ return NULL; -+ } -+ - return wdat; - } - --- -2.17.1 - |