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devfreq: add use_ab tunnable

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In some usecases AB votes may not be needed but governor
cannot suppress the AB measured on HW.

Provide use_ab tunable for userspace to drop AB vote.

Change-Id: Ib7734e06fa00f86eb536b63526c16212012b614d
Signed-off-by: Santosh Mardi <gsantosh@codeaurora.org>
This commit is contained in:
Santosh Mardi 2019-10-21 10:59:36 +05:30
parent 2b7e21626c
commit 6e7faf82f0
1 changed files with 7 additions and 1 deletions

8
drivers/devfreq/governor_bw_hwmon.c
View file

@ -40,6 +40,7 @@ struct hwmon_node {
unsigned int hyst_trigger_count;
unsigned int hyst_length;
unsigned int idle_mbps;
unsigned int use_ab;
unsigned int mbps_zones[NUM_MBPS_ZONES];
unsigned long prev_ab;
@ -462,8 +463,10 @@ static unsigned long get_bw_and_set_irq(struct hwmon_node *node,
}
node->prev_ab = new_bw;
if (ab)
if (ab && node->use_ab)
*ab = roundup(new_bw, node->bw_step);
else if (ab)
*ab = 0;
*freq = (new_bw * 100) / io_percent;
trace_bw_hwmon_update(dev_name(node->hw->df->dev.parent),
@ -803,6 +806,7 @@ gov_attr(hist_memory, 0U, 90U);
gov_attr(hyst_trigger_count, 0U, 90U);
gov_attr(hyst_length, 0U, 90U);
gov_attr(idle_mbps, 0U, 2000U);
gov_attr(use_ab, 0U, 1U);
gov_list_attr(mbps_zones, NUM_MBPS_ZONES, 0U, UINT_MAX);
static struct attribute *dev_attr[] = {
@ -819,6 +823,7 @@ static struct attribute *dev_attr[] = {
&dev_attr_hyst_trigger_count.attr,
&dev_attr_hyst_length.attr,
&dev_attr_idle_mbps.attr,
&dev_attr_use_ab.attr,
&dev_attr_mbps_zones.attr,
&dev_attr_throttle_adj.attr,
NULL,
@ -967,6 +972,7 @@ int register_bw_hwmon(struct device *dev, struct bw_hwmon *hwmon)
node->hyst_trigger_count = 3;
node->hyst_length = 0;
node->idle_mbps = 400;
node->use_ab = 1;
node->mbps_zones[0] = 0;
node->hw = hwmon;