On 11/23/2016 10:31 PM, Imre Deak wrote:
On Wed, 2016-11-23 at 21:48 +0530, Animesh Manna wrote:
While suspending the device hpd related interrupts are enabled
to get the interrupt when device is in suspend state.
Though display is in DC9 but system can be in S0 or S0i3 state.
Hot plug during S0 state will generate de_port_interrupt but if
system is in S0i3 state then display driver will get hotplug
interrupt as pcu_hpd_interrupt which will come via pmc. So
added the interrupt handling for pcu hpd interrupt.
Signed-off-by: Animesh Manna <animesh.manna@xxxxxxxxx>
Signed-off-by: A.Sunil Kamath <sunil.kamath@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_irq.c | 56 ++++++++++++++++++++++++++++++++++++++---
drivers/gpu/drm/i915/i915_reg.h | 12 +++++++++
2 files changed, 65 insertions(+), 3 deletions(-)
mode change 100644 => 100755 drivers/gpu/drm/i915/i915_irq.c
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
old mode 100644
new mode 100755
index cb8a75f..2f9b604
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -110,9 +110,9 @@
/* BXT hpd list */
static const u32 hpd_bxt[HPD_NUM_PINS] = {
- [HPD_PORT_A] = BXT_DE_PORT_HP_DDIA,
- [HPD_PORT_B] = BXT_DE_PORT_HP_DDIB,
- [HPD_PORT_C] = BXT_DE_PORT_HP_DDIC
+ [HPD_PORT_A] = (BXT_DE_PORT_HP_DDIA | BXT_PCU_DC9_HP_DDIA),
+ [HPD_PORT_B] = (BXT_DE_PORT_HP_DDIB | BXT_PCU_DC9_HP_DDIB),
+ [HPD_PORT_C] = (BXT_DE_PORT_HP_DDIC | BXT_PCU_DC9_HP_DDIC)
These are bits programmed to GEN8_DE_PORT_*, so adding the PCU bits
here is bogus.
Thanks Imre for review. I understood the "hpd_bxt" array is to store all
bits which validate hpd interrupt in irq_handler from the respective port.
Previously only from DE_PORT interrupt used to come and after
implementing HPD as wake feature interrupt source will be both DE_PORT
and PCU.
So added pcu related bits in the same array.
Do you want two different array for DE_PORT and PCU. I can do it by
creating a new array named "hpd_bxt_pcu" and change the existing one as
"hpd_bxt_de".
Please let me know your suggestion.
};
/* IIR can theoretically queue up two events. Be paranoid. */
@@ -2463,6 +2463,24 @@ static void bxt_hpd_irq_handler(struct drm_i915_private *dev_priv,
DRM_ERROR("The master control interrupt lied (DE PORT)!\n");
}
+ if (master_ctl & GEN8_PCU_IRQ) {
+ iir = I915_READ(GEN8_PCU_IIR);
+ if (iir) {
+ u32 tmp_mask;
+
+ I915_WRITE(GEN8_PCU_IIR, iir);
+ ret = IRQ_HANDLED;
+ if (IS_BROXTON(dev_priv)) {
+ tmp_mask = iir & BXT_PCU_DC9_HOTPLUG_MASK;
+ if (tmp_mask)
+ bxt_hpd_irq_handler(dev_priv, tmp_mask,
+ hpd_bxt);
+ } else
+ DRM_ERROR("Unexpected PCU interrupt\n");
+ } else
+ DRM_ERROR("The master control interrupt lied (PCU)!\n");
+ }
+
for_each_pipe(dev_priv, pipe) {
u32 flip_done, fault_errors;
@@ -4294,6 +4312,19 @@ void intel_irq_uninstall(struct drm_i915_private *dev_priv)
dev_priv->pm.irqs_enabled = false;
}
+static void bxt_enable_pcu_interrupt(struct drm_i915_private *dev_priv)
+{
+ u32 de_pcu_hpd_enable_mask, de_pcu_imr, de_pcu_ier;
+
+ de_pcu_hpd_enable_mask = GEN9_DE_PCU_PORTA_HOTPLUG |
+ GEN9_DE_PCU_PORTB_HOTPLUG |
+ GEN9_DE_PCU_PORTC_HOTPLUG;
+
+ de_pcu_imr = (I915_READ(GEN8_PCU_IMR) & 0x0);
Typo.
Will remove "de" tag from all pcu related variables, for anything else
let me know.
GEN8 and GEN9 is using same pcu interrupt registers so used the same
macro "GEN8_PCU_IMR".
+ de_pcu_ier = (I915_READ(GEN8_PCU_IER) | de_pcu_hpd_enable_mask);
+ GEN5_IRQ_INIT(GEN8_PCU_, de_pcu_imr, de_pcu_ier);
+}
+
/**
* intel_runtime_pm_disable_interrupts - runtime interrupt disabling
* @dev_priv: i915 device instance
@@ -4303,8 +4334,27 @@ void intel_irq_uninstall(struct drm_i915_private *dev_priv)
*/
void intel_runtime_pm_disable_interrupts(struct drm_i915_private *dev_priv)
{
+ unsigned long flags = 0;
+
dev_priv->drm.driver->irq_uninstall(&dev_priv->drm);
dev_priv->pm.irqs_enabled = false;
+
+ if (IS_BROXTON(dev_priv) && dev_priv->vbt.hpd_wakeup_enabled) {
+
+ /* Enable HPD related interrupts during DC9 for HPD wakeup */
+
+ I915_WRITE(GEN8_MASTER_IRQ, GEN8_MASTER_IRQ_CONTROL);
+ POSTING_READ(GEN8_MASTER_IRQ);
+
+ spin_lock_irqsave(&dev_priv->irq_lock, flags);
+ if (dev_priv->display.hpd_irq_setup)
+ dev_priv->display.hpd_irq_setup(dev_priv);
+ spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
+
+ bxt_enable_pcu_interrupt(dev_priv);
The lock should be around the whole IRQ programming sequence.
Just to make happy the "assert_spin_locked" which present inside
hpd_irq_setup() taken the irq_lock.
As we are disabling all the inerrupts in initial stage, is it ok to take
lock before and after enabling display port and pcu interrupts.
BTW, intel_runtime_pm_disable_interrupts function don't have any lock
before.
+
+ dev_priv->pm.irqs_enabled = true;
+ }
synchronize_irq(dev_priv->drm.irq);
This should come before the IRQ enabling.
Sure, will do it in next patchset.
}
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 3361d7f..df89025 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6030,6 +6030,18 @@ enum {
#define GEN8_PCU_IIR _MMIO(0x444e8)
#define GEN8_PCU_IER _MMIO(0x444ec)
+/* BXT PCU DC9 hotplug control */
+#define BXT_PCU_DC9_HP_DDIA (1<<31)
+#define BXT_PCU_DC9_HP_DDIB (1<<30)
+#define BXT_PCU_DC9_HP_DDIC (1<<29)
+#define BXT_PCU_DC9_HOTPLUG_MASK (BXT_PCU_DC9_HP_DDIA | \
+ BXT_PCU_DC9_HP_DDIB | \
+ BXT_PCU_DC9_HP_DDIC)
+
+#define GEN9_DE_PCU_PORTA_HOTPLUG (1 << 31)
+#define GEN9_DE_PCU_PORTB_HOTPLUG (1 << 30)
+#define GEN9_DE_PCU_PORTC_HOTPLUG (1 << 29)
Redundant copy of the BXT_ defines?
will remove in the next patchset.
+
#define ILK_DISPLAY_CHICKEN2 _MMIO(0x42004)
/* Required on all Ironlake and Sandybridge according to the B-Spec. */
#define ILK_ELPIN_409_SELECT (1 << 25)
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