[PATCH 1/2] clk: sunxi-ng: Fix CPUX clock for the A23/A33

[PATCH 1/2] clk: sunxi-ng: Fix CPUX clock for the A23/A33

[Icenowy Zheng]

The CPUX clock of A23/33 CCU driver forgot to add CLK_SET_RATE_PARENT
flag, which makes its frequency fail to change (as part of cpu thermal
throttle).

Fix it by add this flag.

Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>
---
Patch 4.9-rc too.
 drivers/clk/sunxi-ng/ccu-sun8i-a23.c | 2 +-
 drivers/clk/sunxi-ng/ccu-sun8i-a33.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/sunxi-ng/ccu-sun8i-a23.c b/drivers/clk/sunxi-ng/ccu-sun8i-a23.c
index 2646d98..44c4775 100644
--- a/drivers/clk/sunxi-ng/ccu-sun8i-a23.c
+++ b/drivers/clk/sunxi-ng/ccu-sun8i-a23.c
@@ -163,7 +163,7 @@ static SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK(pll_de_clk, "pll-de",
 static const char * const cpux_parents[] = { "osc32k", "osc24M",
 					     "pll-cpux" , "pll-cpux" };
 static SUNXI_CCU_MUX(cpux_clk, "cpux", cpux_parents,
-		     0x050, 16, 2, CLK_IS_CRITICAL);
+		     0x050, 16, 2, CLK_IS_CRITICAL | CLK_SET_RATE_PARENT);
 
 static SUNXI_CCU_M(axi_clk, "axi", "cpux", 0x050, 0, 2, 0);
 
diff --git a/drivers/clk/sunxi-ng/ccu-sun8i-a33.c b/drivers/clk/sunxi-ng/ccu-sun8i-a33.c
index 96b40ca..59cfdc8 100644
--- a/drivers/clk/sunxi-ng/ccu-sun8i-a33.c
+++ b/drivers/clk/sunxi-ng/ccu-sun8i-a33.c
@@ -170,7 +170,7 @@ static SUNXI_CCU_N_WITH_GATE_LOCK(pll_ddr1_clk, "pll-ddr1",
 static const char * const cpux_parents[] = { "osc32k", "osc24M",
 					     "pll-cpux" , "pll-cpux" };
 static SUNXI_CCU_MUX(cpux_clk, "cpux", cpux_parents,
-		     0x050, 16, 2, CLK_IS_CRITICAL);
+		     0x050, 16, 2, CLK_IS_CRITICAL | CLK_SET_RATE_PARENT);
 
 static SUNXI_CCU_M(axi_clk, "axi", "cpux", 0x050, 0, 2, 0);
 
-- 
2.10.1

[PATCH 1/2] clk: sunxi-ng: Fix CPUX clock for the A23/A33

[Maxime Ripard]

Hi,

On Mon, Nov 07, 2016 at 01:29:31AM +0800, Icenowy Zheng wrote:
> The CPUX clock of A23/33 CCU driver forgot to add CLK_SET_RATE_PARENT
> flag, which makes its frequency fail to change (as part of cpu thermal
> throttle).
> 
> Fix it by add this flag.

Your commit title and log could be better.

The title usually is more about what is done in the patch itself,
something like "clk: sunxi-ng: Allow to change the parent rate for the
CPU clocks" in this case.

And your commit log should explain why it is an issue. Yours is even
wrong here, we could definitely change the rate of these clocks
already. The only thing that was not allowed was to change the rate of
its parents, which is what this patch fixes.

> Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>
> ---
> Patch 4.9-rc too.

I don't see why it should be part of 4.9. No one uses that code in 4.9.

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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[PATCH 1/2] clk: sunxi-ng: Fix CPUX clock for the A23/A33

[Maxime Ripard]

On Mon, Nov 07, 2016 at 05:36:03PM +0800, Icenowy Zheng wrote:
> > And your commit log should explain why it is an issue. Yours is even 
> > wrong here, we could definitely change the rate of these clocks 
> > already. The only thing that was not allowed was to change the rate of 
> > its parents, which is what this patch fixes. 
> >
> > > Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz> 
> > > --- 
> > > Patch 4.9-rc too. 
> >
> > I don't see why it should be part of 4.9. No one uses that code in 4.9. 
> 
> It can be triggered by a modified dt in 4.9, by add operating points.

Still, there's no reason to fix something that is not used by anyone,
it can definitely wait until the next release. Linus also said that he
didn't want patches like that last week.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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