diff options
| author | Tomas Winkler <tomas.winkler@intel.com> | 2013-01-08 23:07:27 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-08 16:40:47 -0800 |
| commit | adfba3220b625ce4bee08e7e6f48c8a27aac23bb (patch) | |
| tree | be763cb3537e28f43bb43df856bdbe82bc2bdbbd /drivers/misc/mei/hw-me.c | |
| parent | 528c8eb4e7c08c5531533de62a558aaf3d076ebb (diff) | |
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/mei/hw-me.c')
| -rw-r--r-- | drivers/misc/mei/hw-me.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c index 1e82e3311ea..ec4ab895f03 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 |