We don't need to check 3rd pipe specifically, as it shares PLL with some
other one.
(v2 - for stable kernel: clarify bug description to explain that this
fixes suspend when 3rd pipe is active - fd.o bug #41977).
Upstream commit:
commit 07c1e8c1462fa7324de4c36ae9e55da2abd79cee
Author: Eugeni Dodonov <eugeni.dodonov at intel.com>
Date: Sat Jan 7 23:40:35 2012 -0200
drm/i915: handle 3rd pipe
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=41977
Signed-off-by: Eugeni Dodonov <eugeni.dodonov at intel.com>
Reviewed-by: Jesse Barnes <jbarnes at virtuousgeek.org>
Signed-off-by: Keith Packard <keithp at keithp.com>
Signed-off-by: Eugeni Dodonov <eugeni.dodonov at intel.com>
---
drivers/gpu/drm/i915/i915_suspend.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_suspend.c b/drivers/gpu/drm/i915/i915_suspend.c
index 7886e4f..b815140 100644
--- a/drivers/gpu/drm/i915/i915_suspend.c
+++ b/drivers/gpu/drm/i915/i915_suspend.c
@@ -34,6 +34,10 @@ static bool i915_pipe_enabled(struct drm_device *dev, enum pipe pipe)
struct drm_i915_private *dev_priv = dev->dev_private;
u32 dpll_reg;
+ /* On IVB, 3rd pipe shares PLL with another one */
+ if (pipe > 1)
+ return false;
+
if (HAS_PCH_SPLIT(dev))
dpll_reg = (pipe == PIPE_A) ? _PCH_DPLL_A : _PCH_DPLL_B;
else
--
1.7.8.4
