diff options
| -rw-r--r-- | drivers/acpi/acpi_video.c | 27 | ||||
| -rw-r--r-- | drivers/acpi/acpi_watchdog.c | 59 | ||||
| -rw-r--r-- | drivers/acpi/button.c | 24 | ||||
| -rw-r--r-- | drivers/acpi/scan.c | 2 |
4 files changed, 98 insertions, 14 deletions
diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c index 76fb96966f7b..2f2e737be0f8 100644 --- a/drivers/acpi/acpi_video.c +++ b/drivers/acpi/acpi_video.c @@ -2123,6 +2123,25 @@ static int __init intel_opregion_present(void) return opregion; } +static bool dmi_is_desktop(void) +{ + const char *chassis_type; + + chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE); + if (!chassis_type) + return false; + + if (!strcmp(chassis_type, "3") || /* 3: Desktop */ + !strcmp(chassis_type, "4") || /* 4: Low Profile Desktop */ + !strcmp(chassis_type, "5") || /* 5: Pizza Box */ + !strcmp(chassis_type, "6") || /* 6: Mini Tower */ + !strcmp(chassis_type, "7") || /* 7: Tower */ + !strcmp(chassis_type, "11")) /* 11: Main Server Chassis */ + return true; + + return false; +} + int acpi_video_register(void) { int ret = 0; @@ -2143,8 +2162,12 @@ int acpi_video_register(void) * win8 ready (where we also prefer the native backlight driver, so * normally the acpi_video code should not register there anyways). */ - if (only_lcd == -1) - only_lcd = acpi_osi_is_win8(); + if (only_lcd == -1) { + if (dmi_is_desktop() && acpi_osi_is_win8()) + only_lcd = true; + else + only_lcd = false; + } dmi_check_system(video_dmi_table); diff --git a/drivers/acpi/acpi_watchdog.c b/drivers/acpi/acpi_watchdog.c index ebb626ffb5fa..4bde16fb97d8 100644 --- a/drivers/acpi/acpi_watchdog.c +++ b/drivers/acpi/acpi_watchdog.c @@ -12,23 +12,64 @@ #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"), + }, + }, + {} +}; + +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; + } + + return wdat; +} + /** * Returns true if this system should prefer ACPI based watchdog instead of * the native one (which are typically the same hardware). */ bool acpi_has_watchdog(void) { - struct acpi_table_header hdr; - - if (acpi_disabled) - return false; - - return ACPI_SUCCESS(acpi_get_table_header(ACPI_SIG_WDAT, 0, &hdr)); + return !!acpi_watchdog_get_wdat(); } EXPORT_SYMBOL_GPL(acpi_has_watchdog); @@ -41,12 +82,10 @@ void __init acpi_watchdog_init(void) struct platform_device *pdev; struct resource *resources; size_t nresources = 0; - acpi_status status; int i; - status = acpi_get_table(ACPI_SIG_WDAT, 0, - (struct acpi_table_header **)&wdat); - if (ACPI_FAILURE(status)) { + wdat = acpi_watchdog_get_wdat(); + if (!wdat) { /* It is fine if there is no WDAT */ return; } diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c index e1eee7a60fad..f1cc4f9d31cd 100644 --- a/drivers/acpi/button.c +++ b/drivers/acpi/button.c @@ -635,4 +635,26 @@ module_param_call(lid_init_state, NULL, 0644); MODULE_PARM_DESC(lid_init_state, "Behavior for reporting LID initial state"); -module_acpi_driver(acpi_button_driver); +static int acpi_button_register_driver(struct acpi_driver *driver) +{ + /* + * Modules such as nouveau.ko and i915.ko have a link time dependency + * on acpi_lid_open(), and would therefore not be loadable on ACPI + * capable kernels booted in non-ACPI mode if the return value of + * acpi_bus_register_driver() is returned from here with ACPI disabled + * when this driver is built as a module. + */ + if (acpi_disabled) + return 0; + + return acpi_bus_register_driver(driver); +} + +static void acpi_button_unregister_driver(struct acpi_driver *driver) +{ + if (!acpi_disabled) + acpi_bus_unregister_driver(driver); +} + +module_driver(acpi_button_driver, acpi_button_register_driver, + acpi_button_unregister_driver); diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index cc234e6a6297..970dd87d347c 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -2166,10 +2166,10 @@ int __init acpi_scan_init(void) acpi_cmos_rtc_init(); acpi_container_init(); acpi_memory_hotplug_init(); + acpi_watchdog_init(); acpi_pnp_init(); acpi_int340x_thermal_init(); acpi_amba_init(); - acpi_watchdog_init(); acpi_init_lpit(); acpi_scan_add_handler(&generic_device_handler); |