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    Subject[PATCH 3.10 39/46] mei: me: read H_CSR after asserting reset
    Date
    3.10-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Tomas Winkler <tomas.winkler@intel.com>

    commit c40765d919d25d2d44d99c4ce39e48808f137e1e upstream.

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

    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>

    ---
    drivers/misc/mei/hw-me.c | 14 +++++++++++++-
    1 file changed, 13 insertions(+), 1 deletion(-)

    --- a/drivers/misc/mei/hw-me.c
    +++ b/drivers/misc/mei/hw-me.c
    @@ -186,7 +186,19 @@ static void mei_me_hw_reset(struct mei_d
    dev->recvd_hw_ready = false;
    mei_me_reg_write(hw, H_CSR, hcsr);

    - if (dev->dev_state == MEI_DEV_POWER_DOWN)
    + /*
    + * 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);

    dev_dbg(&dev->pdev->dev, "current HCSR = 0x%08x.\n", mei_hcsr_read(hw));



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