drm/i915: Don't touch South Display when PCH_NOP
Interrupts, clock gating, LVDS, and GMBUS are all within the, "this will
be bad for CPU" range when we have PCH_NOP.
There is a bit of a hack in init clock gating. We want to do most of the
clock gating, but the part we skip will hang the system. It could
probably be abstracted a bit better, but I don't feel it's too
unsightly.
v2: Use inverse HAS_PCH_NOP check (Jani)
v3: Actually do what I claimed in v2 (spotted by Daniel)
Merge Ivybridge IRQ handler PCH check to decrease whitespace (Daniel)
Move LVDS bail into this patch (Ben)
v4: logical rebase conflict resolution with SDEIIR (Ben)
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Brush up patch a bit and resolve conflicts:
- Adjust PCH_NOP checks due to Egbert's hpd handling rework.
- Addd a PCH_NOP check in the irq uninstall code.
- Resolve conflicts with Paulo's SDE irq handling race fix.
v5: Drop the added hunks in the ilk irq handler again, they're bogus.
OOps.
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 4c5bdd0..b4e237d 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -758,7 +758,7 @@
{
struct drm_device *dev = (struct drm_device *) arg;
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
- u32 de_iir, gt_iir, de_ier, pm_iir, sde_ier;
+ u32 de_iir, gt_iir, de_ier, pm_iir, sde_ier = 0;
irqreturn_t ret = IRQ_NONE;
int i;
@@ -773,9 +773,11 @@
* able to process them after we restore SDEIER (as soon as we restore
* it, we'll get an interrupt if SDEIIR still has something to process
* due to its back queue). */
- sde_ier = I915_READ(SDEIER);
- I915_WRITE(SDEIER, 0);
- POSTING_READ(SDEIER);
+ if (!HAS_PCH_NOP(dev)) {
+ sde_ier = I915_READ(SDEIER);
+ I915_WRITE(SDEIER, 0);
+ POSTING_READ(SDEIER);
+ }
gt_iir = I915_READ(GTIIR);
if (gt_iir) {
@@ -802,7 +804,7 @@
}
/* check event from PCH */
- if (de_iir & DE_PCH_EVENT_IVB) {
+ if (!HAS_PCH_NOP(dev) && (de_iir & DE_PCH_EVENT_IVB)) {
u32 pch_iir = I915_READ(SDEIIR);
cpt_irq_handler(dev, pch_iir);
@@ -825,8 +827,10 @@
I915_WRITE(DEIER, de_ier);
POSTING_READ(DEIER);
- I915_WRITE(SDEIER, sde_ier);
- POSTING_READ(SDEIER);
+ if (!HAS_PCH_NOP(dev)) {
+ I915_WRITE(SDEIER, sde_ier);
+ POSTING_READ(SDEIER);
+ }
return ret;
}
@@ -2027,6 +2031,9 @@
I915_WRITE(GTIER, 0x0);
POSTING_READ(GTIER);
+ if (HAS_PCH_NOP(dev))
+ return;
+
/* south display irq */
I915_WRITE(SDEIMR, 0xffffffff);
/*
@@ -2112,6 +2119,10 @@
mask = SDE_GMBUS | SDE_AUX_MASK;
else
mask = SDE_GMBUS_CPT | SDE_AUX_MASK_CPT;
+
+ if (HAS_PCH_NOP(dev))
+ return;
+
I915_WRITE(SDEIIR, I915_READ(SDEIIR));
I915_WRITE(SDEIMR, ~mask);
}
@@ -2306,6 +2317,9 @@
I915_WRITE(GTIER, 0x0);
I915_WRITE(GTIIR, I915_READ(GTIIR));
+ if (HAS_PCH_NOP(dev))
+ return;
+
I915_WRITE(SDEIMR, 0xffffffff);
I915_WRITE(SDEIER, 0x0);
I915_WRITE(SDEIIR, I915_READ(SDEIIR));