linux-kernel - [ 078/103] drm/i915: Fix up sdvo hpd pins for i965g/gm

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Message-Id: <20130723220428.680004935@linuxfoundation.org>
Date:	Tue, 23 Jul 2013 15:26:29 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Chris Wilson <chris@...is-wilson.co.uk>,
	Arthur Ranyan <arthur.j.runyan@...el.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [ 078/103] drm/i915: Fix up sdvo hpd pins for i965g/gm

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

------------------

From: Daniel Vetter <daniel.vetter@...ll.ch>

commit 4f7fd7095d85cd31c86cb9ba87bc301319630ccc upstream.

Bspec seems to be full of lies, at least it disagress with reality:
Two systems corrobated that SDVO hpd bits are the same as on gen3.

v2: Update comment a bit.

Tested-by: Chris Wilson <chris@...is-wilson.co.uk>
Cc: Arthur Ranyan <arthur.j.runyan@...el.com>
Reported-and-tested-by: Alex Fiestas <afiestas@....org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=58405
Acked-by: Chris Wilson <chris@...is-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/i915/i915_irq.c |   13 ++-----------
 drivers/gpu/drm/i915/i915_reg.h |   13 ++++++-------
 2 files changed, 8 insertions(+), 18 deletions(-)

--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -70,15 +70,6 @@ static const u32 hpd_status_gen4[] = {
 	[HPD_PORT_D] = PORTD_HOTPLUG_INT_STATUS
 };
 
-static const u32 hpd_status_i965[] = {
-	 [HPD_CRT] = CRT_HOTPLUG_INT_STATUS,
-	 [HPD_SDVO_B] = SDVOB_HOTPLUG_INT_STATUS_I965,
-	 [HPD_SDVO_C] = SDVOC_HOTPLUG_INT_STATUS_I965,
-	 [HPD_PORT_B] = PORTB_HOTPLUG_INT_STATUS,
-	 [HPD_PORT_C] = PORTC_HOTPLUG_INT_STATUS,
-	 [HPD_PORT_D] = PORTD_HOTPLUG_INT_STATUS
-};
-
 static const u32 hpd_status_i915[] = { /* i915 and valleyview are the same */
 	[HPD_CRT] = CRT_HOTPLUG_INT_STATUS,
 	[HPD_SDVO_B] = SDVOB_HOTPLUG_INT_STATUS_I915,
@@ -2952,13 +2943,13 @@ static irqreturn_t i965_irq_handler(int
 			u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
 			u32 hotplug_trigger = hotplug_status & (IS_G4X(dev) ?
 								  HOTPLUG_INT_STATUS_G4X :
-								  HOTPLUG_INT_STATUS_I965);
+								  HOTPLUG_INT_STATUS_I915);
 
 			DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
 				  hotplug_status);
 			if (hotplug_trigger) {
 				if (hotplug_irq_storm_detect(dev, hotplug_trigger,
-							    IS_G4X(dev) ? hpd_status_gen4 : hpd_status_i965))
+							    IS_G4X(dev) ? hpd_status_gen4 : hpd_status_i915))
 					i915_hpd_irq_setup(dev);
 				queue_work(dev_priv->wq,
 					   &dev_priv->hotplug_work);
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1691,6 +1691,12 @@
 /* SDVO is different across gen3/4 */
 #define   SDVOC_HOTPLUG_INT_STATUS_G4X		(1 << 3)
 #define   SDVOB_HOTPLUG_INT_STATUS_G4X		(1 << 2)
+/*
+ * Bspec seems to be seriously misleaded about the SDVO hpd bits on i965g/gm,
+ * since reality corrobates that they're the same as on gen3. But keep these
+ * bits here (and the comment!) to help any other lost wanderers back onto the
+ * right tracks.
+ */
 #define   SDVOC_HOTPLUG_INT_STATUS_I965		(3 << 4)
 #define   SDVOB_HOTPLUG_INT_STATUS_I965		(3 << 2)
 #define   SDVOC_HOTPLUG_INT_STATUS_I915		(1 << 7)
@@ -1701,13 +1707,6 @@
 						 PORTB_HOTPLUG_INT_STATUS | \
 						 PORTC_HOTPLUG_INT_STATUS | \
 						 PORTD_HOTPLUG_INT_STATUS)
-
-#define HOTPLUG_INT_STATUS_I965			(CRT_HOTPLUG_INT_STATUS | \
-						 SDVOB_HOTPLUG_INT_STATUS_I965 | \
-						 SDVOC_HOTPLUG_INT_STATUS_I965 | \
-						 PORTB_HOTPLUG_INT_STATUS | \
-						 PORTC_HOTPLUG_INT_STATUS | \
-						 PORTD_HOTPLUG_INT_STATUS)
 
 #define HOTPLUG_INT_STATUS_I915			(CRT_HOTPLUG_INT_STATUS | \
 						 SDVOB_HOTPLUG_INT_STATUS_I915 | \


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