[patch 016/100] drm/i915: Read the right SDVO register when detecting SVDO/HDMI.

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
---------------------

From: Kristian Høgsberg <krh@xxxxxxxxxx>

upstream commit: 13520b051e8888dd3af9bda639d83e7df76613d1

This fixes incorrect detection of the second SDVO/HDMI output on G4X, and
extra boot time on pre-G4X.

Signed-off-by: Kristian Høgsberg <krh@xxxxxxxxxx>
Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/intel_display.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1474,13 +1474,21 @@ static void intel_setup_outputs(struct d
 
 	if (IS_I9XX(dev)) {
 		int found;
+		u32 reg;
 
 		if (I915_READ(SDVOB) & SDVO_DETECTED) {
 			found = intel_sdvo_init(dev, SDVOB);
 			if (!found && SUPPORTS_INTEGRATED_HDMI(dev))
 				intel_hdmi_init(dev, SDVOB);
 		}
-		if (!IS_G4X(dev) || (I915_READ(SDVOB) & SDVO_DETECTED)) {
+
+		/* Before G4X SDVOC doesn't have its own detect register */
+		if (IS_G4X(dev))
+			reg = SDVOC;
+		else
+			reg = SDVOB;
+
+		if (I915_READ(reg) & SDVO_DETECTED) {
 			found = intel_sdvo_init(dev, SDVOC);
 			if (!found && SUPPORTS_INTEGRATED_HDMI(dev))
 				intel_hdmi_init(dev, SDVOC);

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