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drm/i915: Add a dual link lvds quirk for MacBook Pro 8,2 

When booting with EFI, Apple botched this one up.

v2: Switch the quirk dmesg output to DRM_INFO.
v3: Actually git add the new things ...

Tested-by: Austin Lund <austin.lund@gmail.com>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=42842
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2012-04-01 13:38:50 +02:00
parent bc0daf488f
commit 618563e394
1 changed files with 22 additions and 0 deletions
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22
drivers/gpu/drm/i915/intel_display.c
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@ -24,6 +24,7 @@
* Eric Anholt <eric@anholt.net>
*/
#include <linux/dmi.h>
#include <linux/cpufreq.h>
#include <linux/module.h>
#include <linux/input.h>
@ -418,6 +419,24 @@ static void vlv_init_dpio(struct drm_device *dev)
POSTING_READ(DPIO_CTL);
}
static int intel_dual_link_lvds_callback(const struct dmi_system_id *id)
{
DRM_INFO("Forcing lvds to dual link mode on %s\n", id->ident);
return 1;
}
static const struct dmi_system_id intel_dual_link_lvds[] = {
{
.callback = intel_dual_link_lvds_callback,
.ident = "Apple MacBook Pro (Core i5/i7 Series)",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro8,2"),
},
},
{ } /* terminating entry */
};
static bool is_dual_link_lvds(struct drm_i915_private *dev_priv,
unsigned int reg)
{
@ -427,6 +446,9 @@ static bool is_dual_link_lvds(struct drm_i915_private *dev_priv,
if (i915_lvds_channel_mode > 0)
return i915_lvds_channel_mode == 2;
if (dmi_check_system(intel_dual_link_lvds))
return true;
if (dev_priv->lvds_val)
val = dev_priv->lvds_val;
else {