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mei: don't use cached value for hcsr in mei_hw_reset 

Open code mei_hw_reset to avoid using cached hcsr.
Using cached hcsr can cause unwanted side effects.

Move mei_hw_restet function to hw-me.c as it is hw dependent

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tomas Winkler 2013-01-08 23:07:27 +02:00 committed by Greg Kroah-Hartman
parent 528c8eb4e7
commit adfba3220b
3 changed files with 36 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
drivers/misc/mei/hw-me.c
View File

@ -132,6 +132,41 @@ void mei_disable_interrupts(struct mei_device *dev)
mei_hcsr_set(dev);
}
/**
* mei_hw_reset - resets fw via mei csr register.
*
* @dev: the device structure
* @interrupts_enabled: if interrupt should be enabled after reset.
*/
void mei_hw_reset(struct mei_device *dev, bool intr_enable)
{
u32 hcsr = mei_hcsr_read(dev);
dev_dbg(&dev->pdev->dev, "before reset HCSR = 0x%08x.\n", hcsr);
hcsr |= (H_RST | H_IG);
if (intr_enable)
hcsr |= H_IE;
else
hcsr &= ~H_IE;
hcsr &= ~H_IS;
mei_reg_write(dev, H_CSR, hcsr);
hcsr = mei_hcsr_read(dev);
hcsr &= ~H_RST;
hcsr |= H_IG;
hcsr &= ~H_IS;
mei_reg_write(dev, H_CSR, hcsr);
hcsr = mei_hcsr_read(dev);
dev_dbg(&dev->pdev->dev, "current HCSR = 0x%08x.\n", hcsr);
}
/**
* mei_interrupt_quick_handler - The ISR of the MEI device

28
drivers/misc/mei/init.c
View File

@ -169,22 +169,6 @@ out:
return ret;
}
/**
* mei_hw_reset - resets fw via mei csr register.
*
* @dev: the device structure
* @interrupts_enabled: if interrupt should be enabled after reset.
*/
static void mei_hw_reset(struct mei_device *dev, int interrupts_enabled)
{
dev->host_hw_state |= (H_RST | H_IG);
if (interrupts_enabled)
mei_enable_interrupts(dev);
else
mei_disable_interrupts(dev);
}
/**
* mei_reset - resets host and fw.
*
@ -207,20 +191,8 @@ void mei_reset(struct mei_device *dev, int interrupts_enabled)
dev->dev_state != MEI_DEV_POWER_DOWN &&
dev->dev_state != MEI_DEV_POWER_UP);
dev->host_hw_state = mei_hcsr_read(dev);
dev_dbg(&dev->pdev->dev, "before reset host_hw_state = 0x%08x.\n",
dev->host_hw_state);
mei_hw_reset(dev, interrupts_enabled);
dev->host_hw_state &= ~H_RST;
dev->host_hw_state |= H_IG;
mei_hcsr_set(dev);
dev_dbg(&dev->pdev->dev, "currently saved host_hw_state = 0x%08x.\n",
dev->host_hw_state);
if (dev->dev_state != MEI_DEV_INITIALIZING) {
if (dev->dev_state != MEI_DEV_DISABLED &&

1
drivers/misc/mei/mei_dev.h
View File

@ -385,6 +385,7 @@ void mei_watchdog_unregister(struct mei_device *dev);
* Register Access Function
*/
void mei_hw_reset(struct mei_device *dev, bool intr_enable);
u32 mei_hcsr_read(const struct mei_device *dev);
void mei_hcsr_set(struct mei_device *dev);
u32 mei_mecsr_read(const struct mei_device *dev);