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drm/i915: Enable the PCH PLL for all generations after link training 

Hidden away within one chipset specific path was the necessary logic to
turn on the PLL. This needs to be done everywhere in order for us to
drive any display! As such as soon as we tested on a non-CougarPoint
chipset, we failed to bring up any DisplayPorts and generated a nice set
of assertion failures in the process. At least one part of our logic is
working, the part that assumes that we have no idea what we are doing.

Reported-by: guang.a.yang@intel.com
References: https://bugs.freedesktop.org/show_bug.cgi?id=49712
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2012-05-13 09:54:09 +01:00 committed by Daniel Vetter
parent 48da64a8bf
commit 6f13b7b5be
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i915/intel_display.c
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@ -2796,14 +2796,14 @@ static void ironlake_pch_enable(struct drm_crtc *crtc)
/* For PCH output, training FDI link */
dev_priv->display.fdi_link_train(crtc);
intel_enable_pch_pll(intel_crtc);
if (HAS_PCH_LPT(dev)) {
DRM_DEBUG_KMS("LPT detected: programming iCLKIP\n");
lpt_program_iclkip(crtc);
} else if (HAS_PCH_CPT(dev)) {
u32 sel;
intel_enable_pch_pll(intel_crtc);
temp = I915_READ(PCH_DPLL_SEL);
switch (pipe) {
default: