drm/i915/icl: GSE interrupt moves from DE_MISC to GU_MISC

The Graphics System Event(GSE) interrupt bit has a new location in the
GU_MISC_INTERRUPT_{IIR, ISR, IMR, IER} registers. Since GSE was the only
DE_MISC interrupt that was enabled, with this change we don't enable/handle
any of DE_MISC interrupts for gen11. Credits to Paulo for pointing out
the register change.

v2: from DK
raw_reg_[read/write], branch prediction hint and drop platform check (Mika)

v3: From DK
Early re-enable of master interrupt (Chris)

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
[Paulo: bikesheds and rebases]
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180616000530.5357-1-paulo.r.zanoni@intel.com

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index d5aee0b..64d5e10 100644 (file)
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2954,11 +2954,44 @@ gen11_gt_irq_handler(struct drm_i915_private * const i915,
        spin_unlock(&i915->irq_lock);
 }
 
+static void
+gen11_gu_misc_irq_ack(struct drm_i915_private *dev_priv, const u32 master_ctl,
+                     u32 *iir)
+{
+       void __iomem * const regs = dev_priv->regs;
+
+       if (!(master_ctl & GEN11_GU_MISC_IRQ))
+               return;
+
+       *iir = raw_reg_read(regs, GEN11_GU_MISC_IIR);
+       if (likely(*iir))
+               raw_reg_write(regs, GEN11_GU_MISC_IIR, *iir);
+}
+
+static void
+gen11_gu_misc_irq_handler(struct drm_i915_private *dev_priv,
+                         const u32 master_ctl, const u32 iir)
+{
+       if (!(master_ctl & GEN11_GU_MISC_IRQ))
+               return;
+
+       if (unlikely(!iir)) {
+               DRM_ERROR("GU_MISC iir blank!\n");
+               return;
+       }
+
+       if (iir & GEN11_GU_MISC_GSE)
+               intel_opregion_asle_intr(dev_priv);
+       else
+               DRM_ERROR("Unexpected GU_MISC interrupt 0x%x\n", iir);
+}
+
 static irqreturn_t gen11_irq_handler(int irq, void *arg)
 {
        struct drm_i915_private * const i915 = to_i915(arg);
        void __iomem * const regs = i915->regs;
        u32 master_ctl;
+       u32 gu_misc_iir;
 
        if (!intel_irqs_enabled(i915))
                return IRQ_NONE;
@@ -2987,9 +3020,13 @@ static irqreturn_t gen11_irq_handler(int irq, void *arg)
                enable_rpm_wakeref_asserts(i915);
        }
 
+       gen11_gu_misc_irq_ack(i915, master_ctl, &gu_misc_iir);
+
        /* Acknowledge and enable interrupts. */
        raw_reg_write(regs, GEN11_GFX_MSTR_IRQ, GEN11_MASTER_IRQ | master_ctl);
 
+       gen11_gu_misc_irq_handler(i915, master_ctl, gu_misc_iir);
+
        return IRQ_HANDLED;
 }
 
@@ -3476,6 +3513,7 @@ static void gen11_irq_reset(struct drm_device *dev)
 
        GEN3_IRQ_RESET(GEN8_DE_PORT_);
        GEN3_IRQ_RESET(GEN8_DE_MISC_);
+       GEN3_IRQ_RESET(GEN11_GU_MISC_);
        GEN3_IRQ_RESET(GEN8_PCU_);
 }
 
@@ -3919,9 +3957,12 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
        uint32_t de_pipe_enables;
        u32 de_port_masked = GEN8_AUX_CHANNEL_A;
        u32 de_port_enables;
-       u32 de_misc_masked = GEN8_DE_MISC_GSE | GEN8_DE_EDP_PSR;
+       u32 de_misc_masked = GEN8_DE_EDP_PSR;
        enum pipe pipe;
 
+       if (INTEL_GEN(dev_priv) <= 10)
+               de_misc_masked |= GEN8_DE_MISC_GSE;
+
        if (INTEL_GEN(dev_priv) >= 9) {
                de_pipe_masked |= GEN9_DE_PIPE_IRQ_FAULT_ERRORS;
                de_port_masked |= GEN9_AUX_CHANNEL_B | GEN9_AUX_CHANNEL_C |
@@ -4018,10 +4059,13 @@ static void gen11_gt_irq_postinstall(struct drm_i915_private *dev_priv)
 static int gen11_irq_postinstall(struct drm_device *dev)
 {
        struct drm_i915_private *dev_priv = dev->dev_private;
+       u32 gu_misc_masked = GEN11_GU_MISC_GSE;
 
        gen11_gt_irq_postinstall(dev_priv);
        gen8_de_irq_postinstall(dev_priv);
 
+       GEN3_IRQ_INIT(GEN11_GU_MISC_, ~gu_misc_masked, gu_misc_masked);
+
        I915_WRITE(GEN11_DISPLAY_INT_CTL, GEN11_DISPLAY_IRQ_ENABLE);
 
        I915_WRITE(GEN11_GFX_MSTR_IRQ, GEN11_MASTER_IRQ);

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 50fe3b2..aed5ef9 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7059,9 +7059,16 @@ enum {
 #define GEN8_PCU_IIR _MMIO(0x444e8)
 #define GEN8_PCU_IER _MMIO(0x444ec)
 
+#define GEN11_GU_MISC_ISR      _MMIO(0x444f0)
+#define GEN11_GU_MISC_IMR      _MMIO(0x444f4)
+#define GEN11_GU_MISC_IIR      _MMIO(0x444f8)
+#define GEN11_GU_MISC_IER      _MMIO(0x444fc)
+#define  GEN11_GU_MISC_GSE     (1 << 27)
+
 #define GEN11_GFX_MSTR_IRQ             _MMIO(0x190010)
 #define  GEN11_MASTER_IRQ              (1 << 31)
 #define  GEN11_PCU_IRQ                 (1 << 30)
+#define  GEN11_GU_MISC_IRQ             (1 << 29)
 #define  GEN11_DISPLAY_IRQ             (1 << 16)
 #define  GEN11_GT_DW_IRQ(x)            (1 << (x))
 #define  GEN11_GT_DW1_IRQ              (1 << 1)