linux-kernel - [ 29/36] mei: me: fix hardware reset flow

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Message-Id: <20130905202705.734863483@linuxfoundation.org>
Date:	Thu,  5 Sep 2013 13:27:58 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Tomas Winkler <tomas.winkler@...el.com>,
	Shuah Khan <shuah.kh@...sung.com>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Subject: [ 29/36] mei: me: fix hardware reset flow

3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tomas Winkler <tomas.winkler@...el.com>

commit ff96066e3171acdea356b331163495957cb833d0 upstream.

Both H_IS and H_IE needs to be set to receive H_RDY
interrupt

1. Assert H_IS to clear the interrupts during hw reset
and use mei_me_reg_write instead of mei_hcsr_set as the later
strips down the H_IS

2. fix interrupt disablement embarrassing typo
  hcsr |= ~H_IE -> hcsr &= ~H_IE;
this will remove the unwanted interrupt on power down

3. remove useless debug print outs

Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
Cc: Shuah Khan <shuah.kh@...sung.com>
Cc: Konstantin Khlebnikov <khlebnikov@...nvz.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/misc/mei/hw-me.c |    8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

--- a/drivers/misc/mei/hw-me.c
+++ b/drivers/misc/mei/hw-me.c
@@ -176,16 +176,14 @@ static void mei_me_hw_reset(struct mei_d
 	struct mei_me_hw *hw = to_me_hw(dev);
 	u32 hcsr = mei_hcsr_read(hw);
 
-	dev_dbg(&dev->pdev->dev, "before reset HCSR = 0x%08x.\n", hcsr);
-
-	hcsr |= (H_RST | H_IG);
+	hcsr |= H_RST | H_IG | H_IS;
 
 	if (intr_enable)
 		hcsr |= H_IE;
 	else
-		hcsr |= ~H_IE;
+		hcsr &= ~H_IE;
 
-	mei_hcsr_set(hw, hcsr);
+	mei_me_reg_write(hw, H_CSR, hcsr);
 
 	if (dev->dev_state == MEI_DEV_POWER_DOWN)
 		mei_me_hw_reset_release(dev);


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