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drm/i915: LPT:LP needs port A HPD enabled in both north and south

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If the CPU and PCH are on the same package we must enabled the port A
HPD also in the south hotplug register. To identify the package type
we simply look at the PCH type: LPT-H means separate package, and
LPT-LP means multi chip package (MCP).

v2: Add comment and pimp commit message

Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2015-08-27 23:56:05 +03:00 committed by Daniel Vetter
parent 23bb4cb512
commit 0b2eb33e5e
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/i915/i915_irq.c
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@ -3131,6 +3131,12 @@ static void ibx_hpd_irq_setup(struct drm_device *dev)
hotplug |= PORTD_HOTPLUG_ENABLE | PORTD_PULSE_DURATION_2ms;
hotplug |= PORTC_HOTPLUG_ENABLE | PORTC_PULSE_DURATION_2ms;
hotplug |= PORTB_HOTPLUG_ENABLE | PORTB_PULSE_DURATION_2ms;
/*
* When CPU and PCH are on the same package, port A
* HPD must be enabled in both north and south.
*/
if (HAS_PCH_LPT_LP(dev))
hotplug |= PORTA_HOTPLUG_ENABLE;
I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
}