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drm/i915: add lpt_init_pch_refclk

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We need this code to init the PCH SSC refclk and the FDI registers.
The BIOS does this too and that's why VGA worked before this patch,
until you tried to suspend the machine...

This patch implements the "Sequence to enable CLKOUT_DP for FDI usage
and configure PCH FDI/IO" from our documentation.

v2:
- Squash Damien Lespiau's reset spelling fix on top.
- Add a comment that we don't need to bother about the ULT special
  case Damien noticed, since ULT won't have VGA.
- Add a comment to rip out the SDV codepaths once haswell ships for
  real.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com> (v1)
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Paulo Zanoni
2012-12-01 12:04:25 -02:00
committed by Daniel Vetter
parent 988d6ee8b2
commit dde86e2db5
4 changed files with 185 additions and 10 deletions
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3
drivers/gpu/drm/i915/i915_drv.c
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@@ -554,8 +554,7 @@ static int __i915_drm_thaw(struct drm_device *dev)
/* KMS EnterVT equivalent */
if (drm_core_check_feature(dev, DRIVER_MODESET)) {
if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
ironlake_init_pch_refclk(dev);
intel_init_pch_refclk(dev);
mutex_lock(&dev->struct_mutex);
dev_priv->mm.suspended = 0;