[PATCH 3.16.y-ckt 052/183] clk: zynq: Force CPU_2X clock to be ungated

Luis Henriques luis.henriques at canonical.com
Fri Mar 6 09:55:43 UTC 2015

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


From: Soren Brinkmann <soren.brinkmann at xilinx.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 at xilinx.com>
Signed-off-by: Michael Turquette <mturquette at linaro.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.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],
 			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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