Noticed while strolling through docs. Might make a few dual-link dvi
users happy(ier).
v2: Remove the unrelated debug hacks in intel_display.c
Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
drivers/gpu/drm/i915/i915_reg.h | 2 +-
drivers/gpu/drm/i915/intel_sdvo.c | 10 +++++++++-
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index f2a5ea6..a981ff5 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1673,7 +1673,7 @@
#define SDVO_ENABLE (1 << 31)
#define SDVO_PIPE_B_SELECT (1 << 30)
#define SDVO_STALL_SELECT (1 << 29)
-#define SDVO_INTERRUPT_ENABLE (1 << 26)
+#define SDVO_INTERRUPT_ENABLE_PCH (1 << 23)
/**
* 915G/GM SDVO pixel multiplier.
*
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index c275bf0..a9b34f0 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -1085,6 +1085,9 @@ static void intel_sdvo_mode_set(struct drm_encoder *encoder,
if (!mode)
return;
+ /* Preserve the PCH interrupt enable bit. */
+ sdvox = I915_READ(intel_sdvo->sdvo_reg) & SDVO_INTERRUPT_ENABLE_PCH;
+
/* First, set the input mapping for the first input to our controlled
* output. This is only correct if we're a single-input device, in
* which case the first input is the output from the appropriate SDVO
@@ -2775,9 +2778,14 @@ bool intel_sdvo_init(struct drm_device *dev, uint32_t sdvo_reg, bool is_sdvob)
/* Only enable the hotplug irq if we need it, to work around noisy
* hotplug lines.
*/
- if (intel_sdvo->hotplug_active)
+ if (intel_sdvo->hotplug_active) {
dev_priv->hotplug_supported_mask |= hotplug_mask;
+ if (HAS_PCH_SPLIT(dev))
+ intel_sdvo_write_sdvox(intel_sdvo,
+ SDVO_INTERRUPT_ENABLE_PCH);
+ }
+
intel_sdvo_select_ddc_bus(dev_priv, intel_sdvo, sdvo_reg);
/* Set the input timing to the screen. Assume always input 0. */
--
1.7.11.7
