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>

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index ce7914c..e0d0e27 100644 (file)
--- 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 5257cfc..27693c0 100644 (file)
--- 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);