Patch "clk: use round rate to bail out early in set_rate" has been added to the 4.15-stable tree

Patch "clk: use round rate to bail out early in set_rate" has been added to the 4.15-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    clk: use round rate to bail out early in set_rate

to the 4.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     clk-use-round-rate-to-bail-out-early-in-set_rate.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Mar 22 14:03:40 CET 2018
From: Jerome Brunet <jbrunet@baylibre.com>
Date: Fri, 1 Dec 2017 22:51:55 +0100
Subject: clk: use round rate to bail out early in set_rate

From: Jerome Brunet <jbrunet@baylibre.com>


[ Upstream commit ca5e089a32c5ffba6c5101fdabdd6dea18041c34 ]

The current implementation of clk_core_set_rate_nolock() bails out early
if the requested rate is exactly the same as the one set. It should bail
out if the request would not result in a rate a change. This is important
when the rate is not exactly what is requested, which is fairly common
with PLLs.

Ex: provider able to give any rate with steps of 100Hz
 - 1st consumer request 48000Hz and gets it.
 - 2nd consumer request 48010Hz as well. If we were to perform the usual
   mechanism, we would get 48000Hz as well. The clock would not change so
   there is no point performing any checks to make sure the clock can
   change, we know it won't.

This is important to prepare the addition of the clock protection
mechanism

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Tested-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Michael Turquette <mturquette@baylibre.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>
Link: lkml.kernel.org/r/20171201215200.23523-6-jbrunet@baylibre.com
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/clk/clk.c |   25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1642,16 +1642,37 @@ static void clk_change_rate(struct clk_c
 	clk_pm_runtime_put(core);
 }
 
+static unsigned long clk_core_req_round_rate_nolock(struct clk_core *core,
+						     unsigned long req_rate)
+{
+	int ret;
+	struct clk_rate_request req;
+
+	lockdep_assert_held(&prepare_lock);
+
+	if (!core)
+		return 0;
+
+	clk_core_get_boundaries(core, &req.min_rate, &req.max_rate);
+	req.rate = req_rate;
+
+	ret = clk_core_round_rate_nolock(core, &req);
+
+	return ret ? 0 : req.rate;
+}
+
 static int clk_core_set_rate_nolock(struct clk_core *core,
 				    unsigned long req_rate)
 {
 	struct clk_core *top, *fail_clk;
-	unsigned long rate = req_rate;
+	unsigned long rate;
 	int ret = 0;
 
 	if (!core)
 		return 0;
 
+	rate = clk_core_req_round_rate_nolock(core, req_rate);
+
 	/* bail early if nothing to do */
 	if (rate == clk_core_get_rate_nolock(core))
 		return 0;
@@ -1660,7 +1681,7 @@ static int clk_core_set_rate_nolock(stru
 		return -EBUSY;
 
 	/* calculate new rates and get the topmost changed clock */
-	top = clk_calc_new_rates(core, rate);
+	top = clk_calc_new_rates(core, req_rate);
 	if (!top)
 		return -EINVAL;
 


Patches currently in stable-queue which might be from jbrunet@baylibre.com are

queue-4.15/clk-check-ops-pointer-on-clock-register.patch
queue-4.15/net-phy-meson-gxl-check-phy_write-return-value.patch
queue-4.15/clk-use-round-rate-to-bail-out-early-in-set_rate.patch