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authorEgbert Eich <eich@suse.de>2013-04-16 11:36:54 (GMT)
committerDaniel Vetter <daniel.vetter@ffwll.ch>2013-04-18 07:43:28 (GMT)
commitb543fb0464ddf30a5b554957fd212eb7a2acac65 (patch)
tree65d2faf5174a052f75d3fff6b5b9b2b216a9f954 /drivers/gpu/drm/i915
parent08e1413d95b50b19259fe2e425885030f93c7b85 (diff)
downloadlinux-fsl-qoriq-b543fb0464ddf30a5b554957fd212eb7a2acac65.tar.xz
drm/i915: Add HPD IRQ storm detection (v5)
Add a hotplug IRQ storm detection (triggered when a hotplug interrupt fires more than 5 times / sec). Rationale: Despite of the many attempts to fix the problem with noisy hotplug interrupt lines we are still seeing systems which have issues: Once cause of noise seems to be bad routing of the hotplug line on the board: cross talk from other signals seems to cause erronous hotplug interrupts. This has been documented as an erratum for the the i945GM chipset and thus hotplug support was disabled for this chipset model but others seem to have this problem, too. We have seen this issue on a G35 motherboard for example: Even different motherboards of the same model seem to behave differently: while some only see only around 10-100 interrupts/s others seem to see 5k or more. We've also observed a dependency on the selected video mode. Also on certain laptops interrupt noise seems to occur duing battery charging when the battery is at a certain charge levels. Thus we add a simple algorithm here that detects an 'interrupt storm' condition. v2: Fixed comment. v3: Reordered drm_i915_private: moved hpd state tracking to hotplug work stuff. v4: Followed by Jesse Barnes to use a time_..() macro. v5: Fixed coding style as suggested by Jani Nikula. Signed-off-by: Egbert Eich <eich@suse.de> Acked-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915')
-rw-r--r--drivers/gpu/drm/i915/i915_drv.h9
-rw-r--r--drivers/gpu/drm/i915/i915_irq.c69
2 files changed, 66 insertions, 12 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index b5a495a..7b613c2 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -932,6 +932,15 @@ typedef struct drm_i915_private {
struct work_struct hotplug_work;
bool enable_hotplug_processing;
+ struct {
+ unsigned long hpd_last_jiffies;
+ int hpd_cnt;
+ enum {
+ HPD_ENABLED = 0,
+ HPD_DISABLED = 1,
+ HPD_MARK_DISABLED = 2
+ } hpd_mark;
+ } hpd_stats[HPD_NUM_PINS];
int num_pch_pll;
int num_plane;
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index e97bbb2..5ac1291 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -582,6 +582,40 @@ static void gen6_queue_rps_work(struct drm_i915_private *dev_priv,
queue_work(dev_priv->wq, &dev_priv->rps.work);
}
+#define HPD_STORM_DETECT_PERIOD 1000
+#define HPD_STORM_THRESHOLD 5
+
+static inline void hotplug_irq_storm_detect(struct drm_device *dev,
+ u32 hotplug_trigger,
+ const u32 *hpd)
+{
+ drm_i915_private_t *dev_priv = dev->dev_private;
+ unsigned long irqflags;
+ int i;
+
+ spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
+
+ for (i = 1; i < HPD_NUM_PINS; i++) {
+ if (!(hpd[i] & hotplug_trigger) ||
+ dev_priv->hpd_stats[i].hpd_mark != HPD_ENABLED)
+ continue;
+
+ if (!time_in_range(jiffies, dev_priv->hpd_stats[i].hpd_last_jiffies,
+ dev_priv->hpd_stats[i].hpd_last_jiffies
+ + msecs_to_jiffies(HPD_STORM_DETECT_PERIOD))) {
+ dev_priv->hpd_stats[i].hpd_last_jiffies = jiffies;
+ dev_priv->hpd_stats[i].hpd_cnt = 0;
+ } else if (dev_priv->hpd_stats[i].hpd_cnt > HPD_STORM_THRESHOLD) {
+ dev_priv->hpd_stats[i].hpd_mark = HPD_MARK_DISABLED;
+ DRM_DEBUG_KMS("HPD interrupt storm detected on PIN %d\n", i);
+ } else {
+ dev_priv->hpd_stats[i].hpd_cnt++;
+ }
+ }
+
+ spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
+}
+
static void gmbus_irq_handler(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = (drm_i915_private_t *) dev->dev_private;
@@ -650,13 +684,15 @@ static irqreturn_t valleyview_irq_handler(int irq, void *arg)
/* Consume port. Then clear IIR or we'll miss events */
if (iir & I915_DISPLAY_PORT_INTERRUPT) {
u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
+ u32 hotplug_trigger = hotplug_status & HOTPLUG_INT_STATUS_I915;
DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
hotplug_status);
- if (hotplug_status & HOTPLUG_INT_STATUS_I915)
+ if (hotplug_trigger) {
+ hotplug_irq_storm_detect(dev, hotplug_trigger, hpd_status_i915);
queue_work(dev_priv->wq,
&dev_priv->hotplug_work);
-
+ }
I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
I915_READ(PORT_HOTPLUG_STAT);
}
@@ -680,10 +716,12 @@ static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
int pipe;
+ u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK;
- if (pch_iir & SDE_HOTPLUG_MASK)
+ if (hotplug_trigger) {
+ hotplug_irq_storm_detect(dev, hotplug_trigger, hpd_ibx);
queue_work(dev_priv->wq, &dev_priv->hotplug_work);
-
+ }
if (pch_iir & SDE_AUDIO_POWER_MASK)
DRM_DEBUG_DRIVER("PCH audio power change on port %d\n",
(pch_iir & SDE_AUDIO_POWER_MASK) >>
@@ -726,10 +764,12 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
int pipe;
+ u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_CPT;
- if (pch_iir & SDE_HOTPLUG_MASK_CPT)
+ if (hotplug_trigger) {
+ hotplug_irq_storm_detect(dev, hotplug_trigger, hpd_cpt);
queue_work(dev_priv->wq, &dev_priv->hotplug_work);
-
+ }
if (pch_iir & SDE_AUDIO_POWER_MASK_CPT)
DRM_DEBUG_DRIVER("PCH audio power change on port %d\n",
(pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
@@ -2621,13 +2661,15 @@ static irqreturn_t i915_irq_handler(int irq, void *arg)
if ((I915_HAS_HOTPLUG(dev)) &&
(iir & I915_DISPLAY_PORT_INTERRUPT)) {
u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
+ u32 hotplug_trigger = hotplug_status & HOTPLUG_INT_STATUS_I915;
DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
hotplug_status);
- if (hotplug_status & HOTPLUG_INT_STATUS_I915)
+ if (hotplug_trigger) {
+ hotplug_irq_storm_detect(dev, hotplug_trigger, hpd_status_i915);
queue_work(dev_priv->wq,
&dev_priv->hotplug_work);
-
+ }
I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
POSTING_READ(PORT_HOTPLUG_STAT);
}
@@ -2854,15 +2896,18 @@ static irqreturn_t i965_irq_handler(int irq, void *arg)
/* Consume port. Then clear IIR or we'll miss events */
if (iir & I915_DISPLAY_PORT_INTERRUPT) {
u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
+ u32 hotplug_trigger = hotplug_status & (IS_G4X(dev) ?
+ HOTPLUG_INT_STATUS_G4X :
+ HOTPLUG_INT_STATUS_I965);
DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
hotplug_status);
- if (hotplug_status & (IS_G4X(dev) ?
- HOTPLUG_INT_STATUS_G4X :
- HOTPLUG_INT_STATUS_I965))
+ if (hotplug_trigger) {
+ hotplug_irq_storm_detect(dev, hotplug_trigger,
+ IS_G4X(dev) ? hpd_status_gen4 : hpd_status_i965);
queue_work(dev_priv->wq,
&dev_priv->hotplug_work);
-
+ }
I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
I915_READ(PORT_HOTPLUG_STAT);
}