[PATCH 3/3] drm/i915/bxt: add support for HPD long/short pulse detection on HPD_PORT_A pin

Imre Deak
2015-07-20T21:43:41Z

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>
---
drivers/gpu/drm/i915/i915_irq.c | 18 +++++++++++++++++-
drivers/gpu/drm/i915/i915_reg.h | 5 +++++
2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 4ad7a31..02b9e73 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -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) {
@@ -1961,7 +1977,7 @@ 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);
}

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index fc70035..be166b3 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5942,6 +5942,11 @@ 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)
--
2.1.0