drm/i915: Fix up sdvo hpd pins for i965g/gm

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.

Cc: Arthur Ranyan <arthur.j.runyan@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Tested-by: Chris Wilson <chris@chris-wilson.co.uk>
Reported-and-tested-by: Alex Fiestas <afiestas@kde.org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=58405
Cc: stable@vger.kernel.org
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

2 files changed, 8 insertions, 18 deletions

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 7857430943ec..611da3a74479 100644
--- 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,
@@ -3449,13 +3440,13 @@ static irqreturn_t i965_irq_handler(int irq, void *arg)
                         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);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 2102ff32ee20..137be4c1abd1 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1874,6 +1874,12 @@
 /* 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)
@@ -1885,13 +1891,6 @@
                                                  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 | \
                                                  SDVOC_HOTPLUG_INT_STATUS_I915 | \