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

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

[Egbert Eich]

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>
---
 drivers/gpu/drm/i915/intel_display.c |   32 ++++++++++++++++++++++++++++++++
 1 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 3511eff..e809fc5 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -7892,6 +7892,34 @@ 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,
+	},
+};			
+		
 static struct intel_quirk intel_quirks[] = {
 	/* HP Mini needs pipe A force quirk (LP: #322104) */
 	{ 0x27ae, 0x103c, 0x361a, quirk_pipea_force },
@@ -7931,6 +7959,10 @@ 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 */
-- 
1.7.6.3

Re: [PATCH] DRM/i915: Add QUIRK_INVERT_BRIGHTNESS for NCR machines.

[Daniel Vetter]

On Sun, Oct 14, 2012 at 03:46:38PM +0200, Egbert Eich wrote:
> 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>

Meh, I've hoped that this invert-brightness quirk would just disappear.
Looks like it's here to stay. Thanks for the patch, applied to -fixes.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch