diff options
| author | Alexander Usyskin <alexander.usyskin@intel.com> | 2014-12-25 00:37:46 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-01-27 08:29:41 -0800 |
| commit | ee45552ef3e0d6d72947f23b23bb86683e8b9f4b (patch) | |
| tree | ac079080e2cbd60e5c609bc1bc53b1711576ca5f /drivers/misc | |
| parent | 60ff540168e9b8fc9a43cf5b182700227edfde7f (diff) | |
mei: clean reset bit before reset
commit b13a65ef190e488e2761d65bdd2e1fe8a3a125f5 upstream.
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.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc')
| -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 4f2fd6fc1e23..432aec8dd3ce 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) |