lkml.org 
[lkml]   [2020]   [Mar]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v1 2/5] clk: Introduce clk_round_rate_unboundly()
Date
In same cases it may be desired to round clock's rate without taking into
account current min/max requests made by the clock's users. One example is
building up OPP table based on a possible clock rates.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/clk/clk.c | 49 +++++++++++++++++++++++++++++++++++----------
include/linux/clk.h | 18 +++++++++++++++++
2 files changed, 56 insertions(+), 11 deletions(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 39c59f063aa0..28c2e1699619 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1412,16 +1412,7 @@ unsigned long clk_hw_round_rate(struct clk_hw *hw, unsigned long rate)
}
EXPORT_SYMBOL_GPL(clk_hw_round_rate);

-/**
- * clk_round_rate - round the given rate for a clk
- * @clk: the clk for which we are rounding a rate
- * @rate: the rate which is to be rounded
- *
- * Takes in a rate as input and rounds it to a rate that the clk can actually
- * use which is then returned. If clk doesn't support round_rate operation
- * then the parent rate is returned.
- */
-long clk_round_rate(struct clk *clk, unsigned long rate)
+static long __clk_round_rate(struct clk *clk, unsigned long rate, bool bound)
{
struct clk_rate_request req;
int ret;
@@ -1434,7 +1425,13 @@ long clk_round_rate(struct clk *clk, unsigned long rate)
if (clk->exclusive_count)
clk_core_rate_unprotect(clk->core);

- clk_core_get_boundaries(clk->core, &req.min_rate, &req.max_rate);
+ if (bound) {
+ clk_core_get_boundaries(clk->core, &req.min_rate,
+ &req.max_rate);
+ } else {
+ req.min_rate = 0;
+ req.max_rate = ULONG_MAX;
+ }
req.rate = rate;

ret = clk_core_round_rate_nolock(clk->core, &req);
@@ -1449,8 +1446,38 @@ long clk_round_rate(struct clk *clk, unsigned long rate)

return req.rate;
}
+
+/**
+ * clk_round_rate - round the given rate for a clk
+ * @clk: the clk for which we are rounding a rate
+ * @rate: the rate which is to be rounded
+ *
+ * Takes in a rate as input and rounds it to a rate that the clk can actually
+ * use which is then returned. If clk doesn't support round_rate operation
+ * then the parent rate is returned.
+ */
+long clk_round_rate(struct clk *clk, unsigned long rate)
+{
+ return __clk_round_rate(clk, rate, true);
+}
EXPORT_SYMBOL_GPL(clk_round_rate);

+/**
+ * clk_round_rate_unboundly - unboundly round the given rate for a clk
+ * @clk: the clk for which we are rounding a rate
+ * @rate: the rate which is to be rounded
+ *
+ * Takes in a rate as input and rounds it to a rate that the clk can use
+ * which is then returned. The given rate isn't bounded by clk users min-max
+ * rates, unlike in a case of clk_round_rate(). If clk doesn't support
+ * round_rate operation then the parent rate is returned.
+ */
+long clk_round_rate_unboundly(struct clk *clk, unsigned long rate)
+{
+ return __clk_round_rate(clk, rate, false);
+}
+EXPORT_SYMBOL_GPL(clk_round_rate_unboundly);
+
/**
* __clk_notify - call clk notifier chain
* @core: clk that is changing rate
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 7fd6a1febcf4..b534643015f5 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -622,6 +622,19 @@ void devm_clk_put(struct device *dev, struct clk *clk);
*/
long clk_round_rate(struct clk *clk, unsigned long rate);

+/**
+ * clk_round_rate_unboundly - adjust a rate to the rate a clock can provide
+ * @clk: clock source
+ * @rate: desired clock rate in Hz
+ *
+ * This helper function rounds the given rate to a value that hardware
+ * could actually accept, without taking into account current min/max
+ * requests. Useful for cases like OPP table buildup.
+ *
+ * Returns rounded clock rate in Hz, or negative errno.
+ */
+long clk_round_rate_unboundly(struct clk *clk, unsigned long rate);
+
/**
* clk_set_rate - set the clock rate for a clock source
* @clk: clock source
@@ -857,6 +870,11 @@ static inline long clk_round_rate(struct clk *clk, unsigned long rate)
return 0;
}

+static inline long clk_round_rate_unboundly(struct clk *clk, unsigned long rate)
+{
+ return 0;
+}
+
static inline bool clk_has_parent(struct clk *clk, struct clk *parent)
{
return true;
--
2.25.1
\
 
 \ /
  Last update: 2020-03-31 01:20    [W:0.140 / U:3.400 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site