Commit ef1bbbf5 authored Sep 23, 2013 by Vikram Mulukutla

msm: clock-debug: Enable debug muxes en route to clock being measured



MSM clock debug muxes have gates that need to be enabled
to allow clock signals to be output to the measurement
circuitry. Since we want to ensure that a clock that is
assumed to be off in software is also not outputting a
signal, it is not possible to call clk_enable on the
measure clock. Therefore call the enable op on all the
clocks upstream of the measure clock, except for the clock
being measured. Also, leave the clocks enabled to allow
measurement using a scope.

Change-Id: Ia8016edd460d03b6a0686c58788457aeb6c9e2c5
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>

parent ed69e69b

arch/arm/mach-msm/clock-debug.c

+7 −1

Original line number	Diff line number	Diff line
		@@ -72,7 +72,7 @@ static struct clk *measure;

		static int clock_debug_measure_get(void data, u64 val)
		{
		struct clk *clock = data;
		struct clk clock = data, par;
		int ret, is_hw_gated;

		/* Check to see if the clock is in hardware gating mode */
		@@ -92,6 +92,12 @@ static int clock_debug_measure_get(void data, u64 val)
		*/
		if (is_hw_gated && clock->count)
		clock->ops->disable_hwcg(clock);
		par = measure;
		while (par && par != clock) {
		if (par->ops->enable)
		par->ops->enable(par);
		par = par->parent;
		}
		*val = clk_get_rate(measure);
		/* Reenable hwgating if it was disabled */
		if (is_hw_gated && clock->count)