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drm/i915/bxt: add support for HPD long/short pulse detection on HPD_PORT_A pin

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This is a requirement for enabling display port HPD support on the port
A HPD pin. This support is to be added by follow-up patches.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Sonika Jindal <sonika.jindal@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Imre Deak 2015-07-20 14:43:39 -07:00 committed by Daniel Vetter
parent cc24fcdcea
commit 63c88d2204
2 changed files with 22 additions and 1 deletions
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18
drivers/gpu/drm/i915/i915_irq.c
View file

@ -1227,6 +1227,22 @@ static irqreturn_t gen8_gt_irq_handler(struct drm_i915_private *dev_priv,
return ret;
}
static bool bxt_port_hotplug_long_detect(enum port port, u32 val)
{
switch (port) {
case PORT_A:
return val & BXT_PORTA_HOTPLUG_LONG_DETECT;
case PORT_B:
return val & PORTB_HOTPLUG_LONG_DETECT;
case PORT_C:
return val & PORTC_HOTPLUG_LONG_DETECT;
case PORT_D:
return val & PORTD_HOTPLUG_LONG_DETECT;
default:
return false;
}
}
static bool pch_port_hotplug_long_detect(enum port port, u32 val)
{
switch (port) {
@ -1964,7 +1980,7 @@ static void bxt_hpd_handler(struct drm_device *dev, uint32_t iir_status)
I915_WRITE(BXT_HOTPLUG_CTL, hp_control);
intel_get_hpd_pins(&pin_mask, &long_mask, hp_trigger, hp_control,
hpd_bxt, pch_port_hotplug_long_detect);
hpd_bxt, bxt_port_hotplug_long_detect);
intel_hpd_irq_handler(dev, pin_mask, long_mask);
}

5
drivers/gpu/drm/i915/i915_reg.h
View file

@ -5985,6 +5985,11 @@ enum skl_disp_power_wells {
/* digital port hotplug */
#define PCH_PORT_HOTPLUG 0xc4030 /* SHOTPLUG_CTL */
#define BXT_PORTA_HOTPLUG_ENABLE (1 << 28)
#define BXT_PORTA_HOTPLUG_STATUS_MASK (0x3 << 24)
#define BXT_PORTA_HOTPLUG_NO_DETECT (0 << 24)
#define BXT_PORTA_HOTPLUG_SHORT_DETECT (1 << 24)
#define BXT_PORTA_HOTPLUG_LONG_DETECT (2 << 24)
#define PORTD_HOTPLUG_ENABLE (1 << 20)
#define PORTD_PULSE_DURATION_2ms (0)
#define PORTD_PULSE_DURATION_4_5ms (1 << 18)