diff options
| author | Tomas Winkler <tomas.winkler@intel.com> | 2014-05-12 13:19:39 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-05-28 01:15:25 +0400 |
| commit | b04ada92ffaabb868497a1fce8e4f6bf74e5488f (patch) | |
| tree | 74280522778df71778cb3f1d924adc8a9717e3c1 /drivers/misc | |
| parent | 84b3294a40c87e5c8bdaf05d9d3c3aff7e320453 (diff) | |
| download | linux-b04ada92ffaabb868497a1fce8e4f6bf74e5488f.tar.xz | |
mei: me: fix hw ready reset flow
We cleared H_RST for H_CSR on spurious interrupt generated when ME_RDY
while cleared and not while ME_RDY is set. The spurious interrupt
is not delivered on all platforms in this case the
driver may fail to initialize.
Cc: stable@vger.kernel.org
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/mei/hw-me.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c index a31bc4c36cca..ac76a6377794 100644 --- a/drivers/misc/mei/hw-me.c +++ b/drivers/misc/mei/hw-me.c @@ -181,6 +181,9 @@ static void mei_me_hw_reset_release(struct mei_device *dev) hcsr |= H_IG; hcsr &= ~H_RST; mei_hcsr_set(hw, hcsr); + + /* complete this write before we set host ready on another CPU */ + mmiowb(); } /** * mei_me_hw_reset - resets fw via mei csr register. @@ -218,6 +221,7 @@ static int mei_me_hw_reset(struct mei_device *dev, bool intr_enable) static void mei_me_host_set_ready(struct mei_device *dev) { struct mei_me_hw *hw = to_me_hw(dev); + hw->host_hw_state = mei_hcsr_read(hw); hw->host_hw_state |= H_IE | H_IG | H_RDY; mei_hcsr_set(hw, hw->host_hw_state); } @@ -646,14 +650,13 @@ irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id) /* check if we need to start the dev */ if (!mei_host_is_ready(dev)) { if (mei_hw_is_ready(dev)) { + mei_me_hw_reset_release(dev); dev_dbg(&dev->pdev->dev, "we need to start the dev.\n"); dev->recvd_hw_ready = true; wake_up_interruptible(&dev->wait_hw_ready); } else { - - dev_dbg(&dev->pdev->dev, "Reset Completed.\n"); - mei_me_hw_reset_release(dev); + dev_dbg(&dev->pdev->dev, "Spurious Interrupt\n"); } goto end; } |