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| author | Takashi Iwai <tiwai@suse.de> | 2012-03-20 13:07:05 +0100 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2012-03-22 23:23:45 +0100 |
| commit | b03543857fd75876b96e10d4320b775e95041bb7 (patch) | |
| tree | 3866fde96f20c80b2632ec2227ce618a7d7b0d57 /drivers/gpu/drm/i915/i915_drv.h | |
| parent | 1a8c55d37268d8b7ab7797e6d378caa697dbd029 (diff) | |
| download | op-kernel-dev-b03543857fd75876b96e10d4320b775e95041bb7.zip op-kernel-dev-b03543857fd75876b96e10d4320b775e95041bb7.tar.gz | |
drm/i915: Check VBIOS value for determining LVDS dual channel mode, too
Currently i915 driver checks [PCH_]LVDS register bits to decide
whether to set up the dual-link or the single-link mode. This relies
implicitly on that BIOS initializes the register properly at boot.
However, BIOS doesn't initialize it always. When the machine is
booted with the closed lid, BIOS skips the LVDS reg initialization.
This ends up in blank output on a machine with a dual-link LVDS when
you open the lid after the boot.
This patch adds a workaround for that problem by checking the initial
LVDS register value in VBT.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=37742
Tested-By: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_drv.h')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_drv.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index b6098b0..4cbed7f 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -406,6 +406,8 @@ typedef struct drm_i915_private { unsigned int lvds_use_ssc:1; unsigned int display_clock_mode:1; int lvds_ssc_freq; + unsigned int bios_lvds_val; /* initial [PCH_]LVDS reg val in VBIOS */ + unsigned int lvds_val; /* used for checking LVDS channel mode */ struct { int rate; int lanes; |
