[PATCH] clk: Handle CLK_GET_RATE_NOCACHE flag in clk_set_rate()

* [PATCH] clk: Handle CLK_GET_RATE_NOCACHE flag in clk_set_rate()
@ 2013-06-21 13:07 Sylwester Nawrocki
       [not found] ` <20130621161627.9136.84494@quantum>
  0 siblings, 1 reply; 2+ messages in thread
From: Sylwester Nawrocki @ 2013-06-21 13:07 UTC (permalink / raw)
  To: mturquette
  Cc: linux-arm-kernel, linux-kernel, Sylwester Nawrocki, Kyungmin Park

If a clock has CLK_GET_RATE_NOCACHE flag set the rate needs to
be recalculated, rather than referencing the cached value.

Currently cached clk->rate is compared with new value to see if
anything needs to be done in clk_set_rate(). This may cause required
clock controller registers update to not happen when same clock
frequency value is being set subsequently.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 drivers/clk/clk.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 1144e8c..ffa304e 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1215,6 +1215,9 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
 	/* prevent racing with updates to the clock topology */
 	clk_prepare_lock();

+	if (clk->flags & CLK_GET_RATE_NOCACHE)
+		__clk_recalc_rates(clk, 0);
+
 	/* bail early if nothing to do */
 	if (rate == clk->rate)
 		goto out;
--
1.7.9.5


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