ACPI / x86: Allow matching always_present_id array entries by DMI

On some x86 systems the DSDT hides APCI devices to work around Windows
driver bugs. On one such system the device is even hidden until a certain
time after _SB.PCI0.GFX0.LCD.LCD1._ON gets called has passed *and*
_STA has been called at least 3 times since. TL;DR: it is a mess.

Until now the always_present_id matching was used to force status
for a whole class of devices, e.g. always enable PWM1 on CHerry Trail
devices.

This commit extends the always_present_id matching code to optionally
also check for a DMI match so that we can also add system specific
quirks to the always_present_id array.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 15 insertions, 4 deletions

diff --git a/drivers/acpi/x86/utils.c b/drivers/acpi/x86/utils.c
index bd86b809c848..b0e16516adfd 100644
--- a/drivers/acpi/x86/utils.c
+++ b/drivers/acpi/x86/utils.c
@@ -12,6 +12,7 @@
  */
 
 #include <linux/acpi.h>
+#include <linux/dmi.h>
 #include <asm/cpu_device_id.h>
 #include <asm/intel-family.h>
 #include "../internal.h"
@@ -20,6 +21,10 @@
  * Some ACPI devices are hidden (status == 0x0) in recent BIOS-es because
  * some recent Windows drivers bind to one device but poke at multiple
  * devices at the same time, so the others get hidden.
+ *
+ * Some BIOS-es (temporarily) hide specific APCI devices to work around Windows
+ * driver bugs. We use DMI matching to match known cases of this.
+ *
  * We work around this by always reporting ACPI_STA_DEFAULT for these
  * devices. Note this MUST only be done for devices where this is safe.
  *
@@ -31,14 +36,16 @@
 struct always_present_id {
         struct acpi_device_id hid[2];
         struct x86_cpu_id cpu_ids[2];
+        struct dmi_system_id dmi_ids[2]; /* Optional */
         const char *uid;
 };
 
 #define ICPU(model)     { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, }
 
-#define ENTRY(hid, uid, cpu_models) {                                   \
+#define ENTRY(hid, uid, cpu_models, dmi...) {                           \
         { { hid, }, {} },                                               \
         { cpu_models, {} },                                             \
+        { { .matches = dmi }, {} },                                     \
         uid,                                                            \
 }
 
@@ -47,13 +54,13 @@ static const struct always_present_id always_present_ids[] = {
          * Bay / Cherry Trail PWM directly poked by GPU driver in win10,
          * but Linux uses a separate PWM driver, harmless if not used.
          */
-        ENTRY("80860F09", "1", ICPU(INTEL_FAM6_ATOM_SILVERMONT1)),
-        ENTRY("80862288", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT)),
+        ENTRY("80860F09", "1", ICPU(INTEL_FAM6_ATOM_SILVERMONT1), {}),
+        ENTRY("80862288", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT), {}),
         /*
          * The INT0002 device is necessary to clear wakeup interrupt sources
          * on Cherry Trail devices, without it we get nobody cared IRQ msgs.
          */
-        ENTRY("INT0002", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT)),
+        ENTRY("INT0002", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT), {}),
 };
 
 bool acpi_device_always_present(struct acpi_device *adev)
@@ -76,6 +83,10 @@ bool acpi_device_always_present(struct acpi_device *adev)
                 if (!x86_match_cpu(always_present_ids[i].cpu_ids))
                         continue;
 
+                if (always_present_ids[i].dmi_ids[0].matches[0].slot &&
+                    !dmi_check_system(always_present_ids[i].dmi_ids))
+                        continue;
+
                 if (old_status != ACPI_STA_DEFAULT) /* Log only once */
                         dev_info(&adev->dev,
                                  "Device [%s] is in always present list\n",