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authorTomas Winkler <tomas.winkler@intel.com>2013-01-08 23:07:27 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-01-08 16:40:47 -0800
commitadfba3220b625ce4bee08e7e6f48c8a27aac23bb (patch)
treebe763cb3537e28f43bb43df856bdbe82bc2bdbbd /drivers/misc
parent528c8eb4e7c08c5531533de62a558aaf3d076ebb (diff)
downloadop-kernel-dev-adfba3220b625ce4bee08e7e6f48c8a27aac23bb.zip
op-kernel-dev-adfba3220b625ce4bee08e7e6f48c8a27aac23bb.tar.gz
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>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/mei/hw-me.c35
-rw-r--r--drivers/misc/mei/init.c28
-rw-r--r--drivers/misc/mei/mei_dev.h1
3 files changed, 36 insertions, 28 deletions
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c
index 1e82e33..ec4ab89 100644
--- a/drivers/misc/mei/hw-me.c
+++ b/drivers/misc/mei/hw-me.c
@@ -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
diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c
index 2391832..5c2054d 100644
--- a/drivers/misc/mei/init.c
+++ b/drivers/misc/mei/init.c
@@ -170,22 +170,6 @@ out:
}
/**
- * 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.
*
* @dev: the device structure
@@ -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 &&
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 88fa194..8692ac8 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -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);
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