This is a note to let you know that I've just added the patch titled
mei: clean reset bit before reset
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mei-clean-reset-bit-before-reset.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>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
From: Alexander Usyskin <alexander.usyskin@xxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/misc/mei/hw-me.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
--- 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_de
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)
Patches currently in stable-queue which might be from alexander.usyskin@xxxxxxxxx are
queue-3.18/mei-clean-reset-bit-before-reset.patch
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