linux-kernel - [PATCH 3.16.y-ckt 052/183] clk: zynq: Force CPU

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Message-Id: <1425635874-19087-53-git-send-email-luis.henriques@canonical.com>
Date:	Fri,  6 Mar 2015 09:55:43 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Soren Brinkmann <soren.brinkmann@...inx.com>,
	Michael Turquette <mturquette@...aro.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 052/183] clk: zynq: Force CPU_2X clock to be ungated

3.16.7-ckt8 -stable review patch.  If anyone has any objections, please let me know.

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

From: Soren Brinkmann <soren.brinkmann@...inx.com>

commit 3dccfecdb867fe35b305a4e493ef5652b7d9d4cb upstream.

The CPU_2X clock does not have a classical in-kernel user, but is,
amongst other things, required for OCM and debug access. Make sure this
clock is not mistakenly disabled during boot up by enabling it in the
platform's clock driver.

Fixes: 0ee52b157b8e 'clk: zynq: Add clock controller driver'
Signed-off-by: Soren Brinkmann <soren.brinkmann@...inx.com>
Signed-off-by: Michael Turquette <mturquette@...aro.org>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/clk/zynq/clkc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/clk/zynq/clkc.c b/drivers/clk/zynq/clkc.c
index 246cf1226eaa..5b66a8e0cc82 100644
--- a/drivers/clk/zynq/clkc.c
+++ b/drivers/clk/zynq/clkc.c
@@ -304,6 +304,7 @@ static void __init zynq_clk_setup(struct device_node *np)
 	clks[cpu_2x] = clk_register_gate(NULL, clk_output_name[cpu_2x],
 			"cpu_2x_div", CLK_IGNORE_UNUSED, SLCR_ARM_CLK_CTRL,
 			26, 0, &armclk_lock);
+	clk_prepare_enable(clks[cpu_2x]);
 
 	clk = clk_register_fixed_factor(NULL, "cpu_1x_div", "cpu_div", 0, 1,
 			4 + 2 * tmp);
--
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