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mei: me: read H_CSR after asserting reset

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According the spec the host should read H_CSR again
after asserting reset H_RST to ensure that reset was
read by the firmware

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>
This commit is contained in:
Tomas Winkler 2014-05-12 12:19:41 +03:00 committed by Greg Kroah-Hartman
parent 07cd7be3d9
commit c40765d919
1 changed files with 12 additions and 0 deletions
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12
drivers/misc/mei/hw-me.c
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@ -206,6 +206,18 @@ static int mei_me_hw_reset(struct mei_device *dev, bool intr_enable)
dev->recvd_hw_ready = false;
mei_me_reg_write(hw, H_CSR, hcsr);
/*
* Host reads the H_CSR once to ensure that the
* posted write to H_CSR completes.
*/
hcsr = mei_hcsr_read(hw);
if ((hcsr & H_RST) == 0)
dev_warn(&dev->pdev->dev, "H_RST is not set = 0x%08X", hcsr);
if ((hcsr & H_RDY) == H_RDY)
dev_warn(&dev->pdev->dev, "H_RDY is not cleared 0x%08X", hcsr);
if (intr_enable == false)
mei_me_hw_reset_release(dev);