drm/i915: Add port A HPD support for BDW

Wire up the port A HPD for BDW. Compared to earlier platforms the
interrupt setup is a bit different, but basically everything else
looks the same.

v2: 0 initialize pin_mask/long_mask due to intel_get_hpd_pins() changes
    Check for BDW before processing the HPD to not break BXT
    Set found=true when processing port A HPD
    Sort out the mess I made of the irq setup in v1
    Warn about bad irq mask vs. enable bits in bdw_update_port_irq()  (Paulo)

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
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 0aa87d03a6190e59463e374bb96a468fe8c967cc..03c79f6d46fc84470595e775d3aad24281cf046f 100644 (file)
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -53,6 +53,10 @@ static const u32 hpd_ivb[HPD_NUM_PINS] = {
        [HPD_PORT_A] = DE_DP_A_HOTPLUG_IVB,
 };
 
+static const u32 hpd_bdw[HPD_NUM_PINS] = {
+       [HPD_PORT_A] = GEN8_PORT_DP_A_HOTPLUG,
+};
+
 static const u32 hpd_ibx[HPD_NUM_PINS] = {
        [HPD_CRT] = SDE_CRT_HOTPLUG,
        [HPD_SDVO_B] = SDE_SDVOB_HOTPLUG,
@@ -370,6 +374,38 @@ void gen6_disable_rps_interrupts(struct drm_device *dev)
        synchronize_irq(dev->irq);
 }
 
+/**
+  * bdw_update_port_irq - update DE port interrupt
+  * @dev_priv: driver private
+  * @interrupt_mask: mask of interrupt bits to update
+  * @enabled_irq_mask: mask of interrupt bits to enable
+  */
+static void bdw_update_port_irq(struct drm_i915_private *dev_priv,
+                               uint32_t interrupt_mask,
+                               uint32_t enabled_irq_mask)
+{
+       uint32_t new_val;
+       uint32_t old_val;
+
+       assert_spin_locked(&dev_priv->irq_lock);
+
+       WARN_ON(enabled_irq_mask & ~interrupt_mask);
+
+       if (WARN_ON(!intel_irqs_enabled(dev_priv)))
+               return;
+
+       old_val = I915_READ(GEN8_DE_PORT_IMR);
+
+       new_val = old_val;
+       new_val &= ~interrupt_mask;
+       new_val |= (~enabled_irq_mask & interrupt_mask);
+
+       if (new_val != old_val) {
+               I915_WRITE(GEN8_DE_PORT_IMR, new_val);
+               POSTING_READ(GEN8_DE_PORT_IMR);
+       }
+}
+
 /**
  * ibx_display_interrupt_update - update SDEIMR
  * @dev_priv: driver private
@@ -2145,10 +2181,24 @@ static irqreturn_t gen8_irq_handler(int irq, void *arg)
                tmp = I915_READ(GEN8_DE_PORT_IIR);
                if (tmp) {
                        bool found = false;
+                       u32 hotplug_trigger = tmp & GEN8_PORT_DP_A_HOTPLUG;
 
                        I915_WRITE(GEN8_DE_PORT_IIR, tmp);
                        ret = IRQ_HANDLED;
 
+                       if (IS_BROADWELL(dev) && hotplug_trigger) {
+                               u32 dig_hotplug_reg, pin_mask = 0, long_mask = 0;
+
+                               dig_hotplug_reg = I915_READ(DIGITAL_PORT_HOTPLUG_CNTRL);
+                               I915_WRITE(DIGITAL_PORT_HOTPLUG_CNTRL, dig_hotplug_reg);
+
+                               intel_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
+                                                  dig_hotplug_reg, hpd_bdw,
+                                                  ilk_port_hotplug_long_detect);
+                               intel_hpd_irq_handler(dev, pin_mask, long_mask);
+                               found = true;
+                       }
+
                        if (tmp & aux_mask) {
                                dp_aux_irq_handler(dev);
                                found = true;
@@ -3166,15 +3216,22 @@ static void ilk_hpd_irq_setup(struct drm_device *dev)
        struct drm_i915_private *dev_priv = dev->dev_private;
        u32 hotplug_irqs, hotplug, enabled_irqs;
 
-       if (INTEL_INFO(dev)->gen >= 7) {
+       if (INTEL_INFO(dev)->gen >= 8) {
+               hotplug_irqs = GEN8_PORT_DP_A_HOTPLUG;
+               enabled_irqs = intel_hpd_enabled_irqs(dev, hpd_bdw);
+
+               bdw_update_port_irq(dev_priv, hotplug_irqs, enabled_irqs);
+       } else if (INTEL_INFO(dev)->gen >= 7) {
                hotplug_irqs = DE_DP_A_HOTPLUG_IVB;
                enabled_irqs = intel_hpd_enabled_irqs(dev, hpd_ivb);
+
+               ilk_update_display_irq(dev_priv, hotplug_irqs, enabled_irqs);
        } else {
                hotplug_irqs = DE_DP_A_HOTPLUG;
                enabled_irqs = intel_hpd_enabled_irqs(dev, hpd_ilk);
-       }
 
-       ilk_update_display_irq(dev_priv, hotplug_irqs, enabled_irqs);
+               ilk_update_display_irq(dev_priv, hotplug_irqs, enabled_irqs);
+       }
 
        /*
         * Enable digital hotplug on the CPU, and configure the DP short pulse
@@ -3486,24 +3543,29 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
 {
        uint32_t de_pipe_masked = GEN8_PIPE_CDCLK_CRC_DONE;
        uint32_t de_pipe_enables;
-       int pipe;
-       u32 de_port_en = GEN8_AUX_CHANNEL_A;
+       u32 de_port_masked = GEN8_AUX_CHANNEL_A;
+       u32 de_port_enables;
+       enum pipe pipe;
 
        if (IS_GEN9(dev_priv)) {
                de_pipe_masked |= GEN9_PIPE_PLANE1_FLIP_DONE |
                                  GEN9_DE_PIPE_IRQ_FAULT_ERRORS;
-               de_port_en |= GEN9_AUX_CHANNEL_B | GEN9_AUX_CHANNEL_C |
-                       GEN9_AUX_CHANNEL_D;
-
+               de_port_masked |= GEN9_AUX_CHANNEL_B | GEN9_AUX_CHANNEL_C |
+                                 GEN9_AUX_CHANNEL_D;
                if (IS_BROXTON(dev_priv))
-                       de_port_en |= BXT_DE_PORT_GMBUS;
-       } else
+                       de_port_masked |= BXT_DE_PORT_GMBUS;
+       } else {
                de_pipe_masked |= GEN8_PIPE_PRIMARY_FLIP_DONE |
                                  GEN8_DE_PIPE_IRQ_FAULT_ERRORS;
+       }
 
        de_pipe_enables = de_pipe_masked | GEN8_PIPE_VBLANK |
                                           GEN8_PIPE_FIFO_UNDERRUN;
 
+       de_port_enables = de_port_masked;
+       if (IS_BROADWELL(dev_priv))
+               de_port_enables |= GEN8_PORT_DP_A_HOTPLUG;
+
        dev_priv->de_irq_mask[PIPE_A] = ~de_pipe_masked;
        dev_priv->de_irq_mask[PIPE_B] = ~de_pipe_masked;
        dev_priv->de_irq_mask[PIPE_C] = ~de_pipe_masked;
@@ -3515,7 +3577,7 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
                                          dev_priv->de_irq_mask[pipe],
                                          de_pipe_enables);
 
-       GEN5_IRQ_INIT(GEN8_DE_PORT_, ~de_port_en, de_port_en);
+       GEN5_IRQ_INIT(GEN8_DE_PORT_, ~de_port_masked, de_port_enables);
 }
 
 static int gen8_irq_postinstall(struct drm_device *dev)
@@ -4298,7 +4360,7 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
                else if (HAS_PCH_SPT(dev))
                        dev_priv->display.hpd_irq_setup = spt_hpd_irq_setup;
                else
-                       dev_priv->display.hpd_irq_setup = ibx_hpd_irq_setup;
+                       dev_priv->display.hpd_irq_setup = ilk_hpd_irq_setup;
        } else if (HAS_PCH_SPLIT(dev)) {
                dev->driver->irq_handler = ironlake_irq_handler;
                dev->driver->irq_preinstall = ironlake_irq_reset;