lkml.org 
[lkml]   [2019]   [Jul]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
Subject[PATCH v4 2/3] OPP: Add support for bandwidth OPP tables
From
Not all devices quantify their performance points in terms of frequency.
Devices like interconnects quantify their performance points in terms of
bandwidth. We need a way to represent these bandwidth levels in OPP. So,
add support for parsing bandwidth OPPs from DT.

Signed-off-by: Saravana Kannan <saravanak@google.com>
---
drivers/opp/of.c | 41 ++++++++++++++++++++++++++++++++---------
drivers/opp/opp.h | 4 +++-
2 files changed, 35 insertions(+), 10 deletions(-)

diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index b313aca9894f..ac73512f4416 100644
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -523,6 +523,35 @@ void dev_pm_opp_of_remove_table(struct device *dev)
}
EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table);

+static int _read_opp_key(struct dev_pm_opp *new_opp, struct device_node *np)
+{
+ int ret;
+ u64 rate;
+ u32 bw;
+
+ ret = of_property_read_u64(np, "opp-hz", &rate);
+ if (!ret) {
+ /*
+ * Rate is defined as an unsigned long in clk API, and so
+ * casting explicitly to its type. Must be fixed once rate is 64
+ * bit guaranteed in clk API.
+ */
+ new_opp->rate = (unsigned long)rate;
+ return 0;
+ }
+
+ ret = of_property_read_u32(np, "opp-peak-KBps", &bw);
+ if (ret)
+ return ret;
+ new_opp->rate = (unsigned long) bw;
+
+ ret = of_property_read_u32(np, "opp-avg-KBps", &bw);
+ if (!ret)
+ new_opp->avg_bw = (unsigned long) bw;
+
+ return 0;
+}
+
/**
* _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings)
* @opp_table: OPP table
@@ -560,22 +589,16 @@ static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table,
if (!new_opp)
return ERR_PTR(-ENOMEM);

- ret = of_property_read_u64(np, "opp-hz", &rate);
+ ret = _read_opp_key(new_opp, np);
if (ret < 0) {
/* "opp-hz" is optional for devices like power domains. */
if (!opp_table->is_genpd) {
- dev_err(dev, "%s: opp-hz not found\n", __func__);
+ dev_err(dev, "%s: opp-hz or opp-peak-bw not found\n",
+ __func__);
goto free_opp;
}

rate_not_available = true;
- } else {
- /*
- * Rate is defined as an unsigned long in clk API, and so
- * casting explicitly to its type. Must be fixed once rate is 64
- * bit guaranteed in clk API.
- */
- new_opp->rate = (unsigned long)rate;
}

of_property_read_u32(np, "opp-level", &new_opp->level);
diff --git a/drivers/opp/opp.h b/drivers/opp/opp.h
index 01a500e2c40a..6bb238af9cac 100644
--- a/drivers/opp/opp.h
+++ b/drivers/opp/opp.h
@@ -56,7 +56,8 @@ extern struct list_head opp_tables;
* @turbo: true if turbo (boost) OPP
* @suspend: true if suspend OPP
* @pstate: Device's power domain's performance state.
- * @rate: Frequency in hertz
+ * @rate: Frequency in hertz OR Peak bandwidth in kilobytes per second
+ * @avg_bw: Average bandwidth in kilobytes per second
* @level: Performance level
* @supplies: Power supplies voltage/current values
* @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
@@ -78,6 +79,7 @@ struct dev_pm_opp {
bool suspend;
unsigned int pstate;
unsigned long rate;
+ unsigned long avg_bw;
unsigned int level;

struct dev_pm_opp_supply *supplies;
--
2.22.0.709.g102302147b-goog
\
 
 \ /
  Last update: 2019-07-27 01:18    [W:0.082 / U:9.892 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site