This is a note to let you know that I've just added the patch titled
clk: sunxi: Fix M factor computation for APB1
to the 4.8-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-sunxi-fix-m-factor-computation-for-apb1.patch
and it can be found in the queue-4.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ac95330b96376550ae7a533d1396272d675adfa2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?St=C3=A9phan=20Rafin?= <stephan@xxxxxxxxxxxx>
Date: Fri, 4 Nov 2016 00:53:56 +0100
Subject: clk: sunxi: Fix M factor computation for APB1
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From: Stéphan Rafin <stephan@xxxxxxxxxxxx>
commit ac95330b96376550ae7a533d1396272d675adfa2 upstream.
commit cfa636886033 ("clk: sunxi: factors: Consolidate get_factors
parameters into a struct") introduced a regression for m factor
computation in sun4i_get_apb1_factors function.
The old code reassigned the "parent_rate" parameter to the targeted
divisor value and was buggy for the returned frequency but not for the
computed factors. Now, returned frequency is good but m factor is
incorrectly computed (its max value 31 is always set resulting in a
significantly slower frequency than the requested one...)
This patch simply restores the original proper computation for m while
keeping the good changes for returned rate.
Fixes: cfa636886033 ("clk: sunxi: factors: Consolidate get_factors parameters into a struct")
Signed-off-by: Stéphan Rafin <stephan@xxxxxxxxxxxx>
Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/clk/sunxi/clk-sunxi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/clk/sunxi/clk-sunxi.c
+++ b/drivers/clk/sunxi/clk-sunxi.c
@@ -373,7 +373,7 @@ static void sun4i_get_apb1_factors(struc
else
calcp = 3;
- calcm = (req->parent_rate >> calcp) - 1;
+ calcm = (div >> calcp) - 1;
req->rate = (req->parent_rate >> calcp) / (calcm + 1);
req->m = calcm;
Patches currently in stable-queue which might be from stephan@xxxxxxxxxxxx are
queue-4.8/clk-sunxi-fix-m-factor-computation-for-apb1.patch
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