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drm/i915: disable_shared_pll doesn't work on pre-gen5

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commit eddfcbcdc2
Author: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Date:   Mon Jun 15 12:33:53 2015 +0200
    drm/i915: Update less state during modeset.

introduced the unconditional calling of disable_shared_dpll, but didn't
fix up pre-gen5 to avoid the BUG_ON at the top of the function.

So change the BUG_ON into a gen check (alternately we could move the
BUG_ON until later, since we shouldn't have a pll struct here either,
but this seems clearer to read).

This fixes a crash on load on my x200s platform.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jesse Barnes
2015-08-03 13:09:11 -07:00
committed by Daniel Vetter
parent 245d96670d
commit 80aa931286
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/i915/intel_display.c
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@@ -1936,7 +1936,9 @@ static void intel_disable_shared_dpll(struct intel_crtc *crtc)
struct intel_shared_dpll *pll = intel_crtc_to_shared_dpll(crtc);
/* PCH only available on ILK+ */
BUG_ON(INTEL_INFO(dev)->gen < 5);
if (INTEL_INFO(dev)->gen < 5)
return;
if (pll == NULL)
return;