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mei: clean reset bit before reset

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H_RST bit in H_CSR register may be found lit before reset is started,
for example if preceding reset flow hasn't completed.
In that case asserting H_RST will be ignored, therefore we need to clean
H_RST bit to start a successful reset sequence.

Cc: <stable@vger.kernel.org> #3.10+
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Usyskin 2014-12-25 00:37:46 +02:00 committed by Greg Kroah-Hartman
parent b7392d2247
commit b13a65ef19
1 changed files with 12 additions and 0 deletions
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12
drivers/misc/mei/hw-me.c
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@ -234,6 +234,18 @@ static int mei_me_hw_reset(struct mei_device *dev, bool intr_enable)
struct mei_me_hw *hw = to_me_hw(dev); struct mei_me_hw *hw = to_me_hw(dev);
u32 hcsr = mei_hcsr_read(hw); u32 hcsr = mei_hcsr_read(hw);
/* H_RST may be found lit before reset is started,
* for example if preceding reset flow hasn't completed.
* In that case asserting H_RST will be ignored, therefore
* we need to clean H_RST bit to start a successful reset sequence.
*/
if ((hcsr & H_RST) == H_RST) {
dev_warn(dev->dev, "H_RST is set = 0x%08X", hcsr);
hcsr &= ~H_RST;
mei_me_reg_write(hw, H_CSR, hcsr);
hcsr = mei_hcsr_read(hw);
}
hcsr |= H_RST | H_IG | H_IS; hcsr |= H_RST | H_IG | H_IS;
if (intr_enable) if (intr_enable)