diff options
| author | Taniya Das <tdas@codeaurora.org> | 2014-10-07 17:19:47 +0530 |
|---|---|---|
| committer | David Keitel <dkeitel@codeaurora.org> | 2016-03-23 20:03:59 -0700 |
| commit | 308ce83a38503ddc1f8e6f3bddb6471dcd44bd82 (patch) | |
| tree | 7d11b062b7beeb6f0e4fdd6fb236b582e71f7041 /drivers/devfreq | |
| parent | 924da379e02c1c89f34eaeb2b040b2f2ddb34f66 (diff) | |
devfreq_devbw: Add support for voting for AB based on IB
Some generic devfreq governors might not provide AB values since that's a
devbw device specific attribute. In such cases, we might want to make an
average bandwidth (AB) vote that's a percentage of the IB vote to make
sure device BW requirement are not grossly misrepresented. This patch adds
support for that.
Change-Id: I76fbb8d688742058980f0d7568f2e7140023917e
Signed-off-by: Taniya Das <tdas@codeaurora.org>
Diffstat (limited to 'drivers/devfreq')
| -rw-r--r-- | drivers/devfreq/devfreq_devbw.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/drivers/devfreq/devfreq_devbw.c b/drivers/devfreq/devfreq_devbw.c index b6b87fc29255..8a836d92e542 100644 --- a/drivers/devfreq/devfreq_devbw.c +++ b/drivers/devfreq/devfreq_devbw.c @@ -45,6 +45,7 @@ struct dev_data { int cur_ab; int cur_ib; long gov_ab; + unsigned int ab_percent; struct devfreq *df; struct devfreq_dev_profile dp; }; @@ -78,6 +79,11 @@ static int set_bw(struct device *dev, int new_ib, int new_ab) return ret; } +static unsigned int find_ab(struct dev_data *d, unsigned long *freq) +{ + return (d->ab_percent * (*freq)) / 100; +} + static void find_freq(struct devfreq_dev_profile *p, unsigned long *freq, u32 flags) { @@ -105,7 +111,11 @@ static int devbw_target(struct device *dev, unsigned long *freq, u32 flags) struct dev_data *d = dev_get_drvdata(dev); find_freq(&d->dp, freq, flags); - return set_bw(dev, *freq, d->gov_ab); + + if (!d->gov_ab) + return set_bw(dev, *freq, find_ab(d, freq)); + else + return set_bw(dev, *freq, d->gov_ab); } static int devbw_get_dev_status(struct device *dev, @@ -119,6 +129,7 @@ static int devbw_get_dev_status(struct device *dev, #define PROP_PORTS "qcom,src-dst-ports" #define PROP_TBL "qcom,bw-tbl" +#define PROP_AB_PER "qcom,ab-percent" #define PROP_ACTIVE "qcom,active-only" int devfreq_add_devbw(struct device *dev) @@ -196,6 +207,15 @@ int devfreq_add_devbw(struct device *dev) p->max_state = len; } + if (of_find_property(dev->of_node, PROP_AB_PER, &len)) { + ret = of_property_read_u32(dev->of_node, PROP_AB_PER, + &d->ab_percent); + if (ret) + return ret; + + dev_dbg(dev, "ab-percent used %u\n", d->ab_percent); + } + d->bus_client = msm_bus_scale_register_client(&d->bw_data); if (!d->bus_client) { dev_err(dev, "Unable to register bus client\n"); |