drm/i915: fix up pch pll handling in ->mode_set

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We ->mode_set is called we can't just blindly reuse an existing pll
since that might be shared with a different, still active pch output.

v2: Only update the pll settings when the pch pll is know to be
unused, otherwise we can wreak havoc with a running pipe. Which in the
case of DP will likely result in a black screen due to loss of link
lock.

v3: Tighten up the asserts a bit more, especially make sure that the
pch pll is still enabled when we try to disable it. This would have
caught the bug fixed in this patch.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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This commit is contained in:

Daniel Vetter 2013-06-05 13:34:03 +02:00

parent b6f3eff713

commit cdbd2316a0

1 changed files with 19 additions and 16 deletions

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drivers/gpu/drm/i915/intel_display.c

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