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drm/i915: Hold struct_mutex during i915_save_state/i915_restore_state 

Lots of register access in these functions, some of which requires the
struct mutex.

These functions now hold the struct mutex across the calls to
i915_save_display and i915_restore_display, and so the internal mutex
calls in those functions have been removed. To ensure that no-one else
was calling them (and hence violating the new required locking
invarient), those functions have been made static.

gen6_enable_rps locks the struct mutex, and so i915_restore_state
unlocks the mutex around calls to that function.

Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Keith Packard <keithp@keithp.com>
hifive-unleashed-5.1
Keith Packard 2011-06-29 00:30:34 -07:00
parent 0d72c6fcb5
commit d70bed1947
2 changed files with 13 additions and 8 deletions
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2
drivers/gpu/drm/i915/i915_drv.h
View File

@ -997,8 +997,6 @@ extern unsigned int i915_enable_fbc;
extern int i915_suspend(struct drm_device *dev, pm_message_t state);
extern int i915_resume(struct drm_device *dev);
extern void i915_save_display(struct drm_device *dev);
extern void i915_restore_display(struct drm_device *dev);
extern int i915_master_create(struct drm_device *dev, struct drm_master *master);
extern void i915_master_destroy(struct drm_device *dev, struct drm_master *master);

19
drivers/gpu/drm/i915/i915_suspend.c
View File

@ -597,7 +597,7 @@ static void i915_restore_modeset_reg(struct drm_device *dev)
return;
}
void i915_save_display(struct drm_device *dev)
static void i915_save_display(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@ -678,7 +678,6 @@ void i915_save_display(struct drm_device *dev)
}
/* VGA state */
mutex_lock(&dev->struct_mutex);
dev_priv->saveVGA0 = I915_READ(VGA0);
dev_priv->saveVGA1 = I915_READ(VGA1);
dev_priv->saveVGA_PD = I915_READ(VGA_PD);
@ -688,10 +687,9 @@ void i915_save_display(struct drm_device *dev)
dev_priv->saveVGACNTRL = I915_READ(VGACNTRL);
i915_save_vga(dev);
mutex_unlock(&dev->struct_mutex);
}
void i915_restore_display(struct drm_device *dev)
static void i915_restore_display(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@ -783,7 +781,6 @@ void i915_restore_display(struct drm_device *dev)
else
I915_WRITE(VGACNTRL, dev_priv->saveVGACNTRL);
mutex_lock(&dev->struct_mutex);
I915_WRITE(VGA0, dev_priv->saveVGA0);
I915_WRITE(VGA1, dev_priv->saveVGA1);
I915_WRITE(VGA_PD, dev_priv->saveVGA_PD);
@ -791,7 +788,6 @@ void i915_restore_display(struct drm_device *dev)
udelay(150);
i915_restore_vga(dev);
mutex_unlock(&dev->struct_mutex);
}
int i915_save_state(struct drm_device *dev)
@ -801,6 +797,8 @@ int i915_save_state(struct drm_device *dev)
pci_read_config_byte(dev->pdev, LBB, &dev_priv->saveLBB);
mutex_lock(&dev->struct_mutex);
/* Hardware status page */
dev_priv->saveHWS = I915_READ(HWS_PGA);
@ -840,6 +838,8 @@ int i915_save_state(struct drm_device *dev)
for (i = 0; i < 3; i++)
dev_priv->saveSWF2[i] = I915_READ(SWF30 + (i << 2));
mutex_unlock(&dev->struct_mutex);
return 0;
}
@ -850,6 +850,8 @@ int i915_restore_state(struct drm_device *dev)
pci_write_config_byte(dev->pdev, LBB, dev_priv->saveLBB);
mutex_lock(&dev->struct_mutex);
/* Hardware status page */
I915_WRITE(HWS_PGA, dev_priv->saveHWS);
@ -867,6 +869,7 @@ int i915_restore_state(struct drm_device *dev)
I915_WRITE(IER, dev_priv->saveIER);
I915_WRITE(IMR, dev_priv->saveIMR);
}
mutex_unlock(&dev->struct_mutex);
intel_init_clock_gating(dev);
@ -878,6 +881,8 @@ int i915_restore_state(struct drm_device *dev)
if (IS_GEN6(dev))
gen6_enable_rps(dev_priv);
mutex_lock(&dev->struct_mutex);
/* Cache mode state */
I915_WRITE (CACHE_MODE_0, dev_priv->saveCACHE_MODE_0 | 0xffff0000);
@ -891,6 +896,8 @@ int i915_restore_state(struct drm_device *dev)
for (i = 0; i < 3; i++)
I915_WRITE(SWF30 + (i << 2), dev_priv->saveSWF2[i]);
mutex_unlock(&dev->struct_mutex);
intel_i2c_reset(dev);
return 0;