This is a note to let you know that I've just added the patch titled
mei: clean reset bit before reset
to my char-misc git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From b13a65ef190e488e2761d65bdd2e1fe8a3a125f5 Mon Sep 17 00:00:00 2001
From: Alexander Usyskin <alexander.usyskin@xxxxxxxxx>
Date: Thu, 25 Dec 2014 00:37:46 +0200
Subject: 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@xxxxxxxxxxxxxxx> #3.10+
Signed-off-by: Alexander Usyskin <alexander.usyskin@xxxxxxxxx>
Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/misc/mei/hw-me.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
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)
--
2.2.1
--
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