[PATCH 3.4 176/214] DRM/i915: Add QUIRK_INVERT_BRIGHTNESS for NCR machines.

Greg Kroah-Hartman
2014-06-05T04:33:24Z

From: Egbert Eich <eich@suse.de>

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>
Cc: Weng Meiling <wengmeiling.weng@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/gpu/drm/i915/intel_display.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)

--- 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>
@@ -9217,6 +9218,34 @@ 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 Mini needs pipe A force quirk (LP: #322104) */
{ 0x27ae, 0x103c, 0x361a, quirk_pipea_force },
@@ -9276,6 +9305,10 @@ static void intel_init_quirks(struct drm
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 */