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drm/i915: Add support for GPU soft reset on Ironlake.

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Ironlake's graphics reset register has to be accessed via the MCHBAR,
rather than via PCI config space, which requires some refactoring.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Kenneth Graunke 2010-09-11 03:17:19 -07:00 committed by Chris Wilson
parent eeccdcac07
commit 0573ed4a94
3 changed files with 27 additions and 7 deletions
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30
drivers/gpu/drm/i915/i915_drv.c
View File

@ -334,6 +334,24 @@ static int i965_reset_complete(struct drm_device *dev)
return gdrst & 0x1;
}
static int i965_do_reset(struct drm_device *dev, u8 flags)
{
u8 gdrst;
pci_read_config_byte(dev->pdev, I965_GDRST, &gdrst);
pci_write_config_byte(dev->pdev, I965_GDRST, gdrst | flags | 0x1);
return wait_for(i965_reset_complete(dev), 500);
}
static int ironlake_do_reset(struct drm_device *dev, u8 flags)
{
struct drm_i915_private *dev_priv = dev->dev_private;
u32 gdrst = I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR);
I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR, gdrst | flags | 0x1);
return wait_for(I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) & 0x1, 500);
}
/**
* i965_reset - reset chip after a hang
* @dev: drm device to reset
@ -353,12 +371,12 @@ static int i965_reset_complete(struct drm_device *dev)
int i965_reset(struct drm_device *dev, u8 flags)
{
drm_i915_private_t *dev_priv = dev->dev_private;
u8 gdrst;
/*
* We really should only reset the display subsystem if we actually
* need to
*/
bool need_display = true;
int ret;
mutex_lock(&dev->struct_mutex);
@ -375,11 +393,11 @@ int i965_reset(struct drm_device *dev, u8 flags)
* well as the reset bit (GR/bit 0). Setting the GR bit
* triggers the reset; when done, the hardware will clear it.
*/
pci_read_config_byte(dev->pdev, I965_GDRST, &gdrst);
pci_write_config_byte(dev->pdev, I965_GDRST, gdrst | flags | 0x1);
/* Wait for the hardware to reset (but no more than 500 ms) */
if (wait_for(i965_reset_complete(dev), 500)) {
if (IS_IRONLAKE(dev))
ret = ironlake_do_reset(dev, flags);
else
ret = i965_do_reset(dev, flags);
if (ret) {
WARN(true, "i915: Failed to reset chip\n");
mutex_unlock(&dev->struct_mutex);
return -EIO;

1
drivers/gpu/drm/i915/i915_irq.c
View File

@ -398,6 +398,7 @@ static void i915_error_work_func(struct work_struct *work)
if (atomic_read(&dev_priv->mm.wedged)) {
switch (INTEL_INFO(dev)->gen) {
case 5:
case 4:
DRM_DEBUG_DRIVER("resetting chip\n");
kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, reset_event);

3
drivers/gpu/drm/i915/i915_reg.h
View File

@ -110,7 +110,8 @@
#define LBB 0xf4
/* Graphics reset regs */
#define I965_GDRST 0xc0
#define I965_GDRST 0xc0 /* PCI config register */
#define ILK_GDSR 0x2ca4 /* MCHBAR offset */
#define GRDOM_FULL (0<<2)
#define GRDOM_RENDER (1<<2)
#define GRDOM_MEDIA (3<<2)