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Revert "drm/i915: Use PM QoS to prevent C-State starvation of gen3 GPU" 

Using PM latency request turns out to be very fragile and only works for
some systems, depending upon the ACPI implementation. However, I've
stumbled across a promising bit in INSTPM: "Interrupt-Based AGPBUSY#".

This reverts commit b0b544cd37.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2011-02-05 10:15:37 +00:00
parent 271d81b841
commit 60c8bdf64a
2 changed files with 0 additions and 38 deletions
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5
drivers/gpu/drm/i915/i915_drv.h
View File

@ -35,7 +35,6 @@
#include "intel_ringbuffer.h"
#include <linux/io-mapping.h>
#include <linux/i2c.h>
#include <linux/pm_qos_params.h>
#include <drm/intel-gtt.h>
/* General customization:
@ -309,10 +308,6 @@ typedef struct drm_i915_private {
int vblank_pipe;
int num_pipe;
atomic_t vblank_enabled;
struct pm_qos_request_list vblank_pm_qos;
struct work_struct vblank_work;
/* For hangcheck timer */
#define DRM_I915_HANGCHECK_PERIOD 1500 /* in ms */
struct timer_list hangcheck_timer;

33
drivers/gpu/drm/i915/i915_irq.c
View File

@ -1332,22 +1332,6 @@ int i915_irq_wait(struct drm_device *dev, void *data,
return i915_wait_irq(dev, irqwait->irq_seq);
}
static void i915_vblank_work_func(struct work_struct *work)
{
drm_i915_private_t *dev_priv =
container_of(work, drm_i915_private_t, vblank_work);
if (atomic_read(&dev_priv->vblank_enabled)) {
if (!dev_priv->vblank_pm_qos.pm_qos_class)
pm_qos_add_request(&dev_priv->vblank_pm_qos,
PM_QOS_CPU_DMA_LATENCY,
15); //>=20 won't work
} else {
if (dev_priv->vblank_pm_qos.pm_qos_class)
pm_qos_remove_request(&dev_priv->vblank_pm_qos);
}
}
/* Called from drm generic code, passed 'crtc' which
* we use as a pipe index
*/
@ -1370,16 +1354,6 @@ int i915_enable_vblank(struct drm_device *dev, int pipe)
i915_enable_pipestat(dev_priv, pipe,
PIPE_VBLANK_INTERRUPT_ENABLE);
spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
/* gen3 platforms have an issue with vsync interrupts not reaching
* cpu during deep c-state sleep (>C1), so we need to install a
* PM QoS handle to prevent C-state starvation of the GPU.
*/
if (dev_priv->info->gen == 3 && !dev_priv->info->is_g33) {
atomic_inc(&dev_priv->vblank_enabled);
queue_work(dev_priv->wq, &dev_priv->vblank_work);
}
return 0;
}
@ -1391,11 +1365,6 @@ void i915_disable_vblank(struct drm_device *dev, int pipe)
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
unsigned long irqflags;
if (dev_priv->info->gen == 3 && !dev_priv->info->is_g33) {
atomic_dec(&dev_priv->vblank_enabled);
queue_work(dev_priv->wq, &dev_priv->vblank_work);
}
spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
if (HAS_PCH_SPLIT(dev))
ironlake_disable_display_irq(dev_priv, (pipe == 0) ?
@ -1678,11 +1647,9 @@ void i915_driver_irq_preinstall(struct drm_device * dev)
int pipe;
atomic_set(&dev_priv->irq_received, 0);
atomic_set(&dev_priv->vblank_enabled, 0);
INIT_WORK(&dev_priv->hotplug_work, i915_hotplug_work_func);
INIT_WORK(&dev_priv->error_work, i915_error_work_func);
INIT_WORK(&dev_priv->vblank_work, i915_vblank_work_func);
if (HAS_PCH_SPLIT(dev)) {
ironlake_irq_preinstall(dev);