Regards
Shashank
On 1/28/2017 1:24 PM, Imre Deak wrote:
On Sat, Jan 28, 2017 at 10:24:19AM +0530, Sharma, Shashank wrote:
Regards
Shashank
On 1/27/2017 3:09 PM, Imre Deak wrote:
For LSPCON resume time initialization we need to sample the
corresponding pin's HPD level, but this is only available when HPD
detection is enabled. Currently we enable detection only when enabling
HPD interrupts which is too late, so bring the enabling of detection
earlier.
This is needed by the next patch.
Cc: Shashank Sharma <shashank.sharma@xxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v4.9+
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_irq.c | 71 +++++++++++++++++++++++++++++------------
1 file changed, 51 insertions(+), 20 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 8440d8b..6daf522 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -3142,24 +3142,33 @@ static void ibx_hpd_irq_setup(struct drm_i915_private *dev_priv)
I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
}
+static void spt_hpd_detection_setup(struct drm_i915_private *dev_priv)
+{
+ u32 hotplug;
+
+ /* Enable digital hotplug on the PCH */
+ hotplug = I915_READ(PCH_PORT_HOTPLUG);
+ hotplug |= PORTA_HOTPLUG_ENABLE |
+ PORTB_HOTPLUG_ENABLE |
+ PORTC_HOTPLUG_ENABLE |
+ PORTD_HOTPLUG_ENABLE;
+ I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
+
+ hotplug = I915_READ(PCH_PORT_HOTPLUG2);
+ hotplug |= PORTE_HOTPLUG_ENABLE;
+ I915_WRITE(PCH_PORT_HOTPLUG2, hotplug);
+}
+
static void spt_hpd_irq_setup(struct drm_i915_private *dev_priv)
{
- u32 hotplug_irqs, hotplug, enabled_irqs;
+ u32 hotplug_irqs, enabled_irqs;
hotplug_irqs = SDE_HOTPLUG_MASK_SPT;
enabled_irqs = intel_hpd_enabled_irqs(dev_priv, hpd_spt);
ibx_display_interrupt_update(dev_priv, hotplug_irqs, enabled_irqs);
- /* Enable digital hotplug on the PCH */
- hotplug = I915_READ(PCH_PORT_HOTPLUG);
- hotplug |= PORTD_HOTPLUG_ENABLE | PORTC_HOTPLUG_ENABLE |
- PORTB_HOTPLUG_ENABLE | PORTA_HOTPLUG_ENABLE;
- I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
-
- hotplug = I915_READ(PCH_PORT_HOTPLUG2);
- hotplug |= PORTE_HOTPLUG_ENABLE;
- I915_WRITE(PCH_PORT_HOTPLUG2, hotplug);
+ spt_hpd_detection_setup(dev_priv);
}
static void ilk_hpd_irq_setup(struct drm_i915_private *dev_priv)
@@ -3196,18 +3205,15 @@ static void ilk_hpd_irq_setup(struct drm_i915_private *dev_priv)
ibx_hpd_irq_setup(dev_priv);
}
-static void bxt_hpd_irq_setup(struct drm_i915_private *dev_priv)
+static void __bxt_hpd_detection_setup(struct drm_i915_private *dev_priv,
+ u32 enabled_irqs)
{
- u32 hotplug_irqs, hotplug, enabled_irqs;
-
- enabled_irqs = intel_hpd_enabled_irqs(dev_priv, hpd_bxt);
- hotplug_irqs = BXT_DE_PORT_HOTPLUG_MASK;
-
- bdw_update_port_irq(dev_priv, hotplug_irqs, enabled_irqs);
+ u32 hotplug;
hotplug = I915_READ(PCH_PORT_HOTPLUG);
- hotplug |= PORTC_HOTPLUG_ENABLE | PORTB_HOTPLUG_ENABLE |
- PORTA_HOTPLUG_ENABLE;
+ hotplug |= PORTA_HOTPLUG_ENABLE |
+ PORTB_HOTPLUG_ENABLE |
+ PORTC_HOTPLUG_ENABLE;
DRM_DEBUG_KMS("Invert bit setting: hp_ctl:%x hp_port:%x\n",
hotplug, enabled_irqs);
@@ -3217,7 +3223,6 @@ static void bxt_hpd_irq_setup(struct drm_i915_private *dev_priv)
* For BXT invert bit has to be set based on AOB design
* for HPD detection logic, update it based on VBT fields.
*/
-
if ((enabled_irqs & BXT_DE_PORT_HP_DDIA) &&
intel_bios_is_port_hpd_inverted(dev_priv, PORT_A))
hotplug |= BXT_DDIA_HPD_INVERT;
@@ -3231,6 +3236,23 @@ static void bxt_hpd_irq_setup(struct drm_i915_private *dev_priv)
I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
}
+static void bxt_hpd_detection_setup(struct drm_i915_private *dev_priv)
+{
+ __bxt_hpd_detection_setup(dev_priv, BXT_DE_PORT_HOTPLUG_MASK);
Do we need another layer of internal function ? Why cant the content of
__bxt_hpd_detection_setup be here, just
like spd_hpd_detection_setup, as they both are static to the file ?
The port configuration is platform specific and so I wanted to keep it
close to where the rest of HPD setup is done. The caller of
bxt_hpd_detection_setup() only cares about enabling detection on _all_
ports as the other *_hpd_detection_setup() helpers.
I am not very convinced, but seems no harm too :)
+}
+
+static void bxt_hpd_irq_setup(struct drm_i915_private *dev_priv)
+{
+ u32 hotplug_irqs, enabled_irqs;
+
+ enabled_irqs = intel_hpd_enabled_irqs(dev_priv, hpd_bxt);
+ hotplug_irqs = BXT_DE_PORT_HOTPLUG_MASK;
+
+ bdw_update_port_irq(dev_priv, hotplug_irqs, enabled_irqs);
+
+ __bxt_hpd_detection_setup(dev_priv, enabled_irqs);
+}
+
static void ibx_irq_postinstall(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = to_i915(dev);
@@ -3246,6 +3268,12 @@ static void ibx_irq_postinstall(struct drm_device *dev)
gen5_assert_iir_is_zero(dev_priv, SDEIIR);
I915_WRITE(SDEIMR, ~mask);
+
+ if (HAS_PCH_IBX(dev_priv) || HAS_PCH_CPT(dev_priv) ||
+ HAS_PCH_LPT(dev_priv))
+ ; /* TODO: Enable HPD detection on older PCH platforms too */
+ else
+ spt_hpd_detection_setup(dev_priv);
}
static void gen5_gt_irq_postinstall(struct drm_device *dev)
@@ -3457,6 +3485,9 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
GEN5_IRQ_INIT(GEN8_DE_PORT_, ~de_port_masked, de_port_enables);
GEN5_IRQ_INIT(GEN8_DE_MISC_, ~de_misc_masked, de_misc_masked);
+
+ if (IS_GEN9_LP(dev_priv))
I have not done the delta analysis between hotplug interrupts, but this will
be true for GLK too.
Should we bother ?
The GLK HPD detection setup and interrupt setup and handling is the same as
on BXT. See bxt_hpd_irq_setup() and bxt_hpd_irq_handler() that are
called on GLK as well.
Yep, I was wandering about SCDC kind of interrupts, which are new in
GLK, but probably I should
take care of it, while writing the code for that.
Reviewed-by: Shashank Sharma <shashank.sharma@xxxxxxxxx>
- Shashank
+ bxt_hpd_detection_setup(dev_priv);
}
static int gen8_irq_postinstall(struct drm_device *dev)
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