diff options
| author | Keith Packard <keithp@keithp.com> | 2011-09-20 00:31:02 +0400 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2011-10-01 02:30:01 +0400 |
| commit | 7fe0b973fadad1634c1a86dda7c6200146299082 (patch) | |
| tree | 8c5601a341d27cbd4fe2db197728362432bbe2fb /drivers/gpu/drm/i915/i915_irq.c | |
| parent | cd0de039bff32ee314046c0e4c047c38aa696f84 (diff) | |
| download | linux-7fe0b973fadad1634c1a86dda7c6200146299082.tar.xz | |
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>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_irq.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_irq.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index 9cbb0cd8f46a..c22823bbf9f0 100644 --- 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; } |