DRM/i915: Add QUIRK_INVERT_BRIGHTNESS for NCR machines.

commit 5f85f176c2f1c9d2a23f60ca0b99e4d0aa5a26a7 upstream.

NCR machines with LVDS panels using Intel chipsets need to have the
QUIRK_INVERT_BRIGHTNESS bit set.
Unfortunately NCR doesn't set a meaningful subvendor/subdevice ID,
therefore we add a DMI dependent quirk list.

Signed-off-by: Egbert Eich <eich@suse.de>
[danvet: fixup whitespace fail.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Jani Nikula <jani.nikula@intel.com>
[bwh: Backported to 3.2:
 - Adjust context
 - Add #include <linux/dmi.h>]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 2de874c..caf05e9 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -25,6 +25,7 @@
  */
 
 #include <linux/cpufreq.h>
+#include <linux/dmi.h>
 #include <linux/module.h>
 #include <linux/input.h>
 #include <linux/i2c.h>
@@ -8848,6 +8849,34 @@ struct intel_quirk {
        void (*hook)(struct drm_device *dev);
 };
 
+/* For systems that don't have a meaningful PCI subdevice/subvendor ID */
+struct intel_dmi_quirk {
+       void (*hook)(struct drm_device *dev);
+       const struct dmi_system_id (*dmi_id_list)[];
+};
+
+static int intel_dmi_reverse_brightness(const struct dmi_system_id *id)
+{
+       DRM_INFO("Backlight polarity reversed on %s\n", id->ident);
+       return 1;
+}
+
+static const struct intel_dmi_quirk intel_dmi_quirks[] = {
+       {
+               .dmi_id_list = &(const struct dmi_system_id[]) {
+                       {
+                               .callback = intel_dmi_reverse_brightness,
+                               .ident = "NCR Corporation",
+                               .matches = {DMI_MATCH(DMI_SYS_VENDOR, "NCR Corporation"),
+                                           DMI_MATCH(DMI_PRODUCT_NAME, ""),
+                               },
+                       },
+                       { }  /* terminating entry */
+               },
+               .hook = quirk_invert_brightness,
+       },
+};
+
 struct intel_quirk intel_quirks[] = {
        /* HP Compaq 2730p needs pipe A force quirk (LP: #291555) */
        { 0x2a42, 0x103c, 0x30eb, quirk_pipea_force },
@@ -8895,6 +8924,10 @@ static void intel_init_quirks(struct drm_device *dev)
                     q->subsystem_device == PCI_ANY_ID))
                        q->hook(dev);
        }
+       for (i = 0; i < ARRAY_SIZE(intel_dmi_quirks); i++) {
+               if (dmi_check_system(*intel_dmi_quirks[i].dmi_id_list) != 0)
+                       intel_dmi_quirks[i].hook(dev);
+       }
 }
 
 /* Disable the VGA plane that we never use */