linux-kernel - [PATCH] mfd: intel-lpss: Do not put device in reset state on suspend

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Date:   Wed, 12 Oct 2016 10:12:20 -0700
From:   Azhar Shaikh <azhar.shaikh@...el.com>
To:     lee.jones@...aro.org
Cc:     andriy.shevchenko@...el.com, heikki.krogerus@...ux.intel.com,
        mika.westerberg@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: [PATCH] mfd: intel-lpss: Do not put device in reset state on suspend

Commit 41a3da2b8e163 ("mfd: intel-lpss: Save register context on
suspend") saved the register context while going to suspend and
also put the device in reset state.

Due to the resetting of device, system cannot enter S3/S0ix
states when no_console_suspend flag is enabled. The system
and serial console both hang. The resetting of device is not
needed while going to suspend. Hence remove this code.

Fixes: 41a3da2b8e163 ("mfd: intel-lpss: Save register context on suspend")
Signed-off-by: Azhar Shaikh <azhar.shaikh@...el.com>
---
 drivers/mfd/intel-lpss.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/mfd/intel-lpss.c b/drivers/mfd/intel-lpss.c
index 41b1138..70c646b 100644
--- a/drivers/mfd/intel-lpss.c
+++ b/drivers/mfd/intel-lpss.c
@@ -502,9 +502,6 @@ int intel_lpss_suspend(struct device *dev)
 	for (i = 0; i < LPSS_PRIV_REG_COUNT; i++)
 		lpss->priv_ctx[i] = readl(lpss->priv + i * 4);
 
-	/* Put the device into reset state */
-	writel(0, lpss->priv + LPSS_PRIV_RESETS);
-
 	return 0;
 }
 EXPORT_SYMBOL_GPL(intel_lpss_suspend);
-- 
2.10.1