This is a note to let you know that I've just added the patch titled
mei: me: read H_CSR after asserting reset
to the 3.14-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-me-read-h_csr-after-asserting-reset.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c40765d919d25d2d44d99c4ce39e48808f137e1e Mon Sep 17 00:00:00 2001
From: Tomas Winkler <tomas.winkler@xxxxxxxxx>
Date: Mon, 12 May 2014 12:19:41 +0300
Subject: mei: me: read H_CSR after asserting reset
From: Tomas Winkler <tomas.winkler@xxxxxxxxx>
commit c40765d919d25d2d44d99c4ce39e48808f137e1e upstream.
According the spec the host should read H_CSR again
after asserting reset H_RST to ensure that reset was
read by the firmware
Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
Signed-off-by: Alexander Usyskin <alexander.usyskin@xxxxxxxxx>
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
@@ -189,6 +189,18 @@ static int mei_me_hw_reset(struct mei_de
dev->recvd_hw_ready = false;
mei_me_reg_write(hw, H_CSR, hcsr);
+ /*
+ * Host reads the H_CSR once to ensure that the
+ * posted write to H_CSR completes.
+ */
+ hcsr = mei_hcsr_read(hw);
+
+ if ((hcsr & H_RST) == 0)
+ dev_warn(&dev->pdev->dev, "H_RST is not set = 0x%08X", hcsr);
+
+ if ((hcsr & H_RDY) == H_RDY)
+ dev_warn(&dev->pdev->dev, "H_RDY is not cleared 0x%08X", hcsr);
+
if (intr_enable == false)
mei_me_hw_reset_release(dev);
Patches currently in stable-queue which might be from tomas.winkler@xxxxxxxxx are
queue-3.14/mei-me-fix-hw-ready-reset-flow.patch
queue-3.14/mei-me-read-h_csr-after-asserting-reset.patch
queue-3.14/mei-me-drop-harmful-wait-optimization.patch
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