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drm/i915/bxt: Add DDI hpd handler 

This patch adds a hot plug interrupt handler function for BXT.
What this function typically does is:
1. Check if hot plug is enabled from hot plug control register.
2. Call hpd_irq_handler with appropriate trigger to detect a
   plug storm and schedule a bottom half.
3. Clear sticky status bits in hot plug control register..

v2: (jani)
- drop redundant unlikely()
- s/Todo/FIXME:/ in code comment
- declare 'found' var in the scope where it's used
- check for IS_BROXTON before handling BXT_DE_PORT_HOTPLUG_MASK

Reviewed-by: Satheeshakrishna M <satheeshakrishna.m@intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Shashank Sharma <shashank.sharma@intel.com> (v1)
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Shashank Sharma 2014-08-22 17:40:41 +05:30 committed by Daniel Vetter
parent 6b5ad42f0a
commit d04a492dd5
1 changed files with 44 additions and 2 deletions
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46
drivers/gpu/drm/i915/i915_irq.c
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@ -2152,6 +2152,38 @@ static irqreturn_t ironlake_irq_handler(int irq, void *arg)
return ret;
}
static void bxt_hpd_handler(struct drm_device *dev, uint32_t iir_status)
{
struct drm_i915_private *dev_priv = dev->dev_private;
uint32_t hp_control;
uint32_t hp_trigger;
/* Get the status */
hp_trigger = iir_status & BXT_DE_PORT_HOTPLUG_MASK;
hp_control = I915_READ(BXT_HOTPLUG_CTL);
/* Hotplug not enabled ? */
if (!(hp_control & BXT_HOTPLUG_CTL_MASK)) {
DRM_ERROR("Interrupt when HPD disabled\n");
return;
}
DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
hp_control & BXT_HOTPLUG_CTL_MASK);
/* Check for HPD storm and schedule bottom half */
intel_hpd_irq_handler(dev, hp_trigger, hp_control, hpd_bxt);
/*
* FIXME: Save the hot plug status for bottom half before
* clearing the sticky status bits, else the status will be
* lost.
*/
/* Clear sticky bits in hpd status */
I915_WRITE(BXT_HOTPLUG_CTL, hp_control);
}
static irqreturn_t gen8_irq_handler(int irq, void *arg)
{
struct drm_device *dev = arg;
@ -2197,12 +2229,22 @@ static irqreturn_t gen8_irq_handler(int irq, void *arg)
if (master_ctl & GEN8_DE_PORT_IRQ) {
tmp = I915_READ(GEN8_DE_PORT_IIR);
if (tmp) {
bool found = false;
I915_WRITE(GEN8_DE_PORT_IIR, tmp);
ret = IRQ_HANDLED;
if (tmp & aux_mask)
if (tmp & aux_mask) {
dp_aux_irq_handler(dev);
else
found = true;
}
if (IS_BROXTON(dev) && tmp & BXT_DE_PORT_HOTPLUG_MASK) {
bxt_hpd_handler(dev, tmp);
found = true;
}
if (!found)
DRM_ERROR("Unexpected DE Port interrupt\n");
}
else