drm/i915: Enable digital port hotplug on PCH systems

We were relying on the BIOS to set these bits, which doesn't always
happen.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-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 9cbb0cd..c22823b 100644 (file)
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1777,6 +1777,26 @@ static void ironlake_irq_preinstall(struct drm_device *dev)
        POSTING_READ(SDEIER);
 }
 
+/*
+ * Enable digital hotplug on the PCH, and configure the DP short pulse
+ * duration to 2ms (which is the minimum in the Display Port spec)
+ *
+ * This register is the same on all known PCH chips.
+ */
+
+static void ironlake_enable_pch_hotplug(struct drm_device *dev)
+{
+       drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
+       u32     hotplug;
+
+       hotplug = I915_READ(PCH_PORT_HOTPLUG);
+       hotplug &= ~(PORTD_PULSE_DURATION_MASK|PORTC_PULSE_DURATION_MASK|PORTB_PULSE_DURATION_MASK);
+       hotplug |= PORTD_HOTPLUG_ENABLE | PORTD_PULSE_DURATION_2ms;
+       hotplug |= PORTC_HOTPLUG_ENABLE | PORTC_PULSE_DURATION_2ms;
+       hotplug |= PORTB_HOTPLUG_ENABLE | PORTB_PULSE_DURATION_2ms;
+       I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
+}
+
 static int ironlake_irq_postinstall(struct drm_device *dev)
 {
        drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
@@ -1839,6 +1859,8 @@ static int ironlake_irq_postinstall(struct drm_device *dev)
        I915_WRITE(SDEIER, hotplug_mask);
        POSTING_READ(SDEIER);
 
+       ironlake_enable_pch_hotplug(dev);
+
        if (IS_IRONLAKE_M(dev)) {
                /* Clear & enable PCU event interrupts */
                I915_WRITE(DEIIR, DE_PCU_EVENT);
@@ -1896,6 +1918,8 @@ static int ivybridge_irq_postinstall(struct drm_device *dev)
        I915_WRITE(SDEIER, hotplug_mask);
        POSTING_READ(SDEIER);
 
+       ironlake_enable_pch_hotplug(dev);
+
        return 0;
 }
 

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 542453f..b7fbb74 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2903,12 +2903,13 @@
 #define SDEIER  0xc400c
 
 /* digital port hotplug */
-#define PCH_PORT_HOTPLUG        0xc4030
+#define PCH_PORT_HOTPLUG        0xc4030                /* SHOTPLUG_CTL */
 #define PORTD_HOTPLUG_ENABLE            (1 << 20)
 #define PORTD_PULSE_DURATION_2ms        (0)
 #define PORTD_PULSE_DURATION_4_5ms      (1 << 18)
 #define PORTD_PULSE_DURATION_6ms        (2 << 18)
 #define PORTD_PULSE_DURATION_100ms      (3 << 18)
+#define PORTD_PULSE_DURATION_MASK      (3 << 18)
 #define PORTD_HOTPLUG_NO_DETECT         (0)
 #define PORTD_HOTPLUG_SHORT_DETECT      (1 << 16)
 #define PORTD_HOTPLUG_LONG_DETECT       (1 << 17)
@@ -2917,6 +2918,7 @@
 #define PORTC_PULSE_DURATION_4_5ms      (1 << 10)
 #define PORTC_PULSE_DURATION_6ms        (2 << 10)
 #define PORTC_PULSE_DURATION_100ms      (3 << 10)
+#define PORTC_PULSE_DURATION_MASK      (3 << 10)
 #define PORTC_HOTPLUG_NO_DETECT         (0)
 #define PORTC_HOTPLUG_SHORT_DETECT      (1 << 8)
 #define PORTC_HOTPLUG_LONG_DETECT       (1 << 9)
@@ -2925,6 +2927,7 @@
 #define PORTB_PULSE_DURATION_4_5ms      (1 << 2)
 #define PORTB_PULSE_DURATION_6ms        (2 << 2)
 #define PORTB_PULSE_DURATION_100ms      (3 << 2)
+#define PORTB_PULSE_DURATION_MASK      (3 << 2)
 #define PORTB_HOTPLUG_NO_DETECT         (0)
 #define PORTB_HOTPLUG_SHORT_DETECT      (1 << 0)
 #define PORTB_HOTPLUG_LONG_DETECT       (1 << 1)