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Date: Tue, 05 Jul 2011 15:43:21 +0100
From: Alan Cox <alan@...rguk.ukuu.org.uk>
To: greg@...ah.com, linux-kernel@...r.kernel.org
Subject: [PATCH 41/49] gma500: tidying up the power stuff a spot
From: Alan Cox <alan@...ux.intel.com>
In particular don't destroy static mutexes, it upsets things
Signed-off-by: Alan Cox <alan@...ux.intel.com>
---
drivers/staging/gma500/power.c | 33 +++++++++++++--------------------
1 files changed, 13 insertions(+), 20 deletions(-)
diff --git a/drivers/staging/gma500/power.c b/drivers/staging/gma500/power.c
index fc2324e..0eee7fb 100644
--- a/drivers/staging/gma500/power.c
+++ b/drivers/staging/gma500/power.c
@@ -27,6 +27,7 @@
* Massively reworked
* Alan Cox <alan@...ux.intel.com>
*/
+
#include "psb_powermgmt.h"
#include "psb_drv.h"
#include "psb_reg.h"
@@ -34,7 +35,8 @@
#include <linux/mutex.h>
#include <linux/pm_runtime.h>
-static struct mutex power_mutex;
+static struct mutex power_mutex; /* Serialize power ops */
+static struct mutex power_ctrl_mutex; /* Serialize power claim */
/**
* gma_power_init - initialise power manager
@@ -46,8 +48,7 @@ void gma_power_init(struct drm_device *dev)
{
struct drm_psb_private *dev_priv = dev->dev_private;
- /* FIXME: need to sort out fetching apm_reg for both platforms ?? */
-
+ /* FIXME: Move APM/OSPM base into relevant device code */
dev_priv->apm_base = dev_priv->apm_reg & 0xffff;
dev_priv->ospm_base &= 0xffff;
@@ -55,6 +56,7 @@ void gma_power_init(struct drm_device *dev)
dev_priv->display_count = 0; /* Currently no users */
dev_priv->suspended = false; /* And not suspended */
mutex_init(&power_mutex);
+ mutex_init(&power_ctrl_mutex);
dev_priv->ops->init_pm(dev);
}
@@ -67,23 +69,15 @@ void gma_power_init(struct drm_device *dev)
*/
void gma_power_uninit(struct drm_device *dev)
{
- mutex_destroy(&power_mutex);
pm_runtime_disable(&dev->pdev->dev);
pm_runtime_set_suspended(&dev->pdev->dev);
}
-
-
-
/**
* gma_suspend_display - suspend the display logic
* @dev: our DRM device
*
* Suspend the display logic of the graphics interface
- *
- * FIXME: This ought to be replaced by a dev_priv-> ops interface
- * where the various platforms register their save/restore methods
- * and keep them in their own support files.
*/
static void gma_suspend_display(struct drm_device *dev)
{
@@ -210,7 +204,6 @@ int gma_power_suspend(struct pci_dev *pdev, pm_message_t state)
return 0;
}
-
/**
* gma_power_resume - resume power
* @pdev: PCI device
@@ -230,8 +223,6 @@ int gma_power_resume(struct pci_dev *pdev)
return 0;
}
-
-
/**
* gma_power_is_on - returne true if power is on
* @dev: our DRM device
@@ -244,7 +235,6 @@ bool gma_power_is_on(struct drm_device *dev)
return dev_priv->display_power;
}
-
/**
* gma_power_begin - begin requiring power
* @dev: our DRM device
@@ -252,22 +242,22 @@ bool gma_power_is_on(struct drm_device *dev)
*
* Begin an action that requires the display power island is enabled.
* We refcount the islands.
- *
- * FIXME: locking
*/
bool gma_power_begin(struct drm_device *dev, bool force_on)
{
struct drm_psb_private *dev_priv = dev->dev_private;
int ret;
+ mutex_lock(&power_ctrl_mutex);
/* Power already on ? */
if (dev_priv->display_power) {
dev_priv->display_count++;
pm_runtime_get(&dev->pdev->dev);
+ mutex_unlock(&power_ctrl_mutex);
return true;
}
if (force_on == false)
- return false;
+ goto out_false;
/* Ok power up needed */
ret = gma_resume_pci(dev->pdev);
@@ -276,12 +266,14 @@ bool gma_power_begin(struct drm_device *dev, bool force_on)
psb_irq_postinstall(dev);
pm_runtime_get(&dev->pdev->dev);
dev_priv->display_count++;
+ mutex_unlock(&power_ctrl_mutex);
return true;
}
+out_false:
+ mutex_unlock(&power_ctrl_mutex);
return false;
}
-
/**
* gma_power_end - end use of power
* @dev: Our DRM device
@@ -292,8 +284,10 @@ bool gma_power_begin(struct drm_device *dev, bool force_on)
void gma_power_end(struct drm_device *dev)
{
struct drm_psb_private *dev_priv = dev->dev_private;
+ mutex_lock(&power_ctrl_mutex);
dev_priv->display_count--;
WARN_ON(dev_priv->display_count < 0);
+ mutex_unlock(&power_ctrl_mutex);
pm_runtime_put(&dev->pdev->dev);
}
@@ -317,4 +311,3 @@ int psb_runtime_idle(struct device *dev)
else
return 1;
}
-
--
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