This is a note to let you know that I've just added the patch titled
clk: sunxi-ng: mp: Adjust parent rate for pre-dividers
to the 4.9-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-ng-mp-adjust-parent-rate-for-pre-dividers.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ac8616e4c81dded650dfade49a7da283565d37ce Mon Sep 17 00:00:00 2001
From: Chen-Yu Tsai <wens@xxxxxxxx>
Date: Tue, 14 Feb 2017 11:35:22 +0800
Subject: clk: sunxi-ng: mp: Adjust parent rate for pre-dividers
From: Chen-Yu Tsai <wens@xxxxxxxx>
commit ac8616e4c81dded650dfade49a7da283565d37ce upstream.
The MP style clocks support an mux with pre-dividers. While the driver
correctly accounted for them in the .determine_rate callback, it did
not in the .recalc_rate and .set_rate callbacks.
This means when calculating the factors in the .set_rate callback, they
would be off by a factor of the active pre-divider. Same goes for
reading back the clock rate after it is set.
Fixes: 2ab836db5097 ("clk: sunxi-ng: Add M-P factor clock support")
Signed-off-by: Chen-Yu Tsai <wens@xxxxxxxx>
Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/clk/sunxi-ng/ccu_mp.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/drivers/clk/sunxi-ng/ccu_mp.c
+++ b/drivers/clk/sunxi-ng/ccu_mp.c
@@ -85,6 +85,10 @@ static unsigned long ccu_mp_recalc_rate(
unsigned int m, p;
u32 reg;
+ /* Adjust parent_rate according to pre-dividers */
+ ccu_mux_helper_adjust_parent_for_prediv(&cmp->common, &cmp->mux,
+ -1, &parent_rate);
+
reg = readl(cmp->common.base + cmp->common.reg);
m = reg >> cmp->m.shift;
@@ -114,6 +118,10 @@ static int ccu_mp_set_rate(struct clk_hw
unsigned int m, p;
u32 reg;
+ /* Adjust parent_rate according to pre-dividers */
+ ccu_mux_helper_adjust_parent_for_prediv(&cmp->common, &cmp->mux,
+ -1, &parent_rate);
+
max_m = cmp->m.max ?: 1 << cmp->m.width;
max_p = cmp->p.max ?: 1 << ((1 << cmp->p.width) - 1);
Patches currently in stable-queue which might be from wens@xxxxxxxx are
queue-4.9/clk-sunxi-ng-mp-adjust-parent-rate-for-pre-dividers.patch
queue-4.9/clk-sunxi-ng-sun6i-fix-enable-bit-offset-for-hdmi-ddc-module-clock.patch