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| author | Alexander Usyskin <alexander.usyskin@intel.com> | 2014-12-25 00:37:46 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-01-09 14:53:13 -0800 |
| commit | b13a65ef190e488e2761d65bdd2e1fe8a3a125f5 (patch) | |
| tree | f9fa8f9375c5f422089ce5e21f3c1b590da1e1b6 | |
| parent | b7392d2247cfe6771f95d256374f1a8e6a6f48d6 (diff) | |
| download | blackbird-op-linux-b13a65ef190e488e2761d65bdd2e1fe8a3a125f5.tar.gz blackbird-op-linux-b13a65ef190e488e2761d65bdd2e1fe8a3a125f5.zip | |
mei: clean reset bit before reset
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>
| -rw-r--r-- | drivers/misc/mei/hw-me.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c index ff2755062b44..06ff0a2ec960 100644 --- a/drivers/misc/mei/hw-me.c +++ b/drivers/misc/mei/hw-me.c @@ -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); 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; if (intr_enable) |
