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authorAdam Jackson <ajax@redhat.com>2011-07-26 16:53:06 -0400
committerKeith Packard <keithp@keithp.com>2011-07-29 16:23:31 -0700
commitcda2bb78c24de7674eafa3210314dc75bed344a6 (patch)
tree267045f7fea7eb65291384cad42eedbc48c57d11 /drivers/gpu
parent291427f5fdadec6e4be2924172e83588880e1539 (diff)
downloadblackbird-op-linux-cda2bb78c24de7674eafa3210314dc75bed344a6.tar.gz
blackbird-op-linux-cda2bb78c24de7674eafa3210314dc75bed344a6.zip
drm/i915/pch: Save/restore PCH_PORT_HOTPLUG across suspend
At least on a Lenovo X220 the HPD bits of this are enabled at boot but cleared after resume, which means plug interrupts stop working. This also happens to fix DP displays re-lighting on resume. I'm quite certain that's an accident: the first DP link train inevitably fails on that machine, and it's only serendipity that we're getting multiple plug interrupts and the second train works. But I shall take my victories where I get them. Signed-off-by: Adam Jackson <ajax@redhat.com> Tested-by: Keith Packard <keithp@keithp.com> Reviewed-by: Keith Packard <keithp@keithp.com> Signed-off-by: Keith Packard <keithp@keithp.com>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/i915/i915_drv.h1
-rw-r--r--drivers/gpu/drm/i915/i915_suspend.c2
2 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index ce7914c4c044..e0d0e278f62d 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -541,6 +541,7 @@ typedef struct drm_i915_private {
u32 savePIPEB_LINK_M1;
u32 savePIPEB_LINK_N1;
u32 saveMCHBAR_RENDER_STANDBY;
+ u32 savePCH_PORT_HOTPLUG;
struct {
/** Bridge to intel-gtt-ko */
diff --git a/drivers/gpu/drm/i915/i915_suspend.c b/drivers/gpu/drm/i915/i915_suspend.c
index 5257cfc34c35..27693c05c6d2 100644
--- a/drivers/gpu/drm/i915/i915_suspend.c
+++ b/drivers/gpu/drm/i915/i915_suspend.c
@@ -814,6 +814,7 @@ int i915_save_state(struct drm_device *dev)
dev_priv->saveFDI_RXB_IMR = I915_READ(_FDI_RXB_IMR);
dev_priv->saveMCHBAR_RENDER_STANDBY =
I915_READ(RSTDBYCTL);
+ dev_priv->savePCH_PORT_HOTPLUG = I915_READ(PCH_PORT_HOTPLUG);
} else {
dev_priv->saveIER = I915_READ(IER);
dev_priv->saveIMR = I915_READ(IMR);
@@ -865,6 +866,7 @@ int i915_restore_state(struct drm_device *dev)
I915_WRITE(GTIMR, dev_priv->saveGTIMR);
I915_WRITE(_FDI_RXA_IMR, dev_priv->saveFDI_RXA_IMR);
I915_WRITE(_FDI_RXB_IMR, dev_priv->saveFDI_RXB_IMR);
+ I915_WRITE(PCH_PORT_HOTPLUG, dev_priv->savePCH_PORT_HOTPLUG);
} else {
I915_WRITE(IER, dev_priv->saveIER);
I915_WRITE(IMR, dev_priv->saveIMR);
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