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Commit db16fb73 authored by Kyle Piefer's avatar Kyle Piefer Committed by Gerrit - the friendly Code Review server
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devfreq: Weight stall cycles more for GPU bus DCVS 



Update GPU Bus DCVS to weight high stall cycles (as a percentage
of total bus usage) heavier in order to vote up the bus when the
GPU is stalling a lot waiting for data.

Change-Id: I8a331a48a1ab737c51f1001ea1991f09af9ef900
Signed-off-by: default avatarKyle Piefer <kpiefer@codeaurora.org>
parent 3ce60773

drivers/devfreq/governor_gpubw_mon.c

+6 −1
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#define HIST                    5

#define TARGET                  80

#define CAP                     75

#define WAIT_THRESHOLD          10

/* AB vote is in multiple of BW_STEP Mega bytes */

#define BW_STEP                 160
@@ -59,6 +60,7 @@ static int devfreq_gpubw_get_target(struct devfreq *df, 
	int act_level;

	int norm_max_cycles;

	int norm_cycles;

	int wait_active_percent;

	int gpu_percent;

	/*

	 * Normalized AB should at max usage be the gpu_bimc frequency in MHz.
@@ -91,6 +93,8 @@ static int devfreq_gpubw_get_target(struct devfreq *df, 
			(unsigned int) priv->bus.total_time;

	norm_cycles = (unsigned int)(priv->bus.ram_time + priv->bus.ram_wait) /

			(unsigned int) priv->bus.total_time;

	wait_active_percent = (100 * (unsigned int)priv->bus.ram_wait) /

			(unsigned int) priv->bus.ram_time;

	gpu_percent = (100 * (unsigned int)priv->bus.gpu_time) /

			(unsigned int) priv->bus.total_time;
@@ -109,7 +113,8 @@ static int devfreq_gpubw_get_target(struct devfreq *df, 
		act_level = (act_level < 0) ? 0 : act_level;

		act_level = (act_level >= priv->bus.num) ?

		(priv->bus.num - 1) : act_level;

		if (norm_cycles > priv->bus.up[act_level] &&

		if ((norm_cycles > priv->bus.up[act_level] ||

				wait_active_percent > WAIT_THRESHOLD) &&

				gpu_percent > CAP)

			bus_profile->flag = DEVFREQ_FLAG_FAST_HINT;

		else if (norm_cycles < priv->bus.down[act_level] && level)