linux-kernel - [PATCH 31/35] crypto: ccree: pm resume first enable the source clk

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Date:   Thu, 18 Apr 2019 16:39:06 +0300
From:   Gilad Ben-Yossef <gilad@...yossef.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Ofir Drang <ofir.drang@....com>, stable@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 31/35] crypto: ccree: pm resume first enable the source clk

From: Ofir Drang <ofir.drang@....com>

On power management resume function first enable the device clk source
to allow access to the device registers.

Signed-off-by: Ofir Drang <ofir.drang@....com>
Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>
Cc: stable@...r.kernel.org # v4.19+
---
 drivers/crypto/ccree/cc_pm.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/ccree/cc_pm.c b/drivers/crypto/ccree/cc_pm.c
index 6f278a0d8ee6..9a5abe406996 100644
--- a/drivers/crypto/ccree/cc_pm.c
+++ b/drivers/crypto/ccree/cc_pm.c
@@ -42,14 +42,15 @@ int cc_pm_resume(struct device *dev)
 	struct cc_drvdata *drvdata = dev_get_drvdata(dev);
 
 	dev_dbg(dev, "unset HOST_POWER_DOWN_EN\n");
-	cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_DISABLE);
-
+	/* Enables the device source clk */
 	rc = cc_clk_on(drvdata);
 	if (rc) {
 		dev_err(dev, "failed getting clock back on. We're toast.\n");
 		return rc;
 	}
 
+	cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_DISABLE);
+
 	rc = init_cc_regs(drvdata, false);
 	if (rc) {
 		dev_err(dev, "init_cc_regs (%x)\n", rc);
-- 
2.21.0