linux-kernel - Re: [PATCH 1/9] drivers: clk: st: Incorrect clocks status

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Date:	Mon, 6 Jul 2015 10:11:03 +0200
From:	Gabriel Fernandez <gabriel.fernandez@...aro.org>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Srinivas Kandagatla <srinivas.kandagatla@...il.com>,
	Maxime Coquelin <maxime.coquelin@...com>,
	Patrice Chotard <patrice.chotard@...com>,
	Russell King <linux@....linux.org.uk>,
	Michael Turquette <mturquette@...libre.com>,
	Peter Griffin <peter.griffin@...aro.org>,
	Pankaj Dev <pankaj.dev@...com>,
	Olivier Bideau <olivier.bideau@...com>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Fabian Frederick <fabf@...net.be>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"kernel@...inux.com" <kernel@...inux.com>,
	linux-clk@...r.kernel.org
Subject: Re: [PATCH 1/9] drivers: clk: st: Incorrect clocks status

Hi Stephen,

Can you drop also this patch because it's concerns an old platform and
there no values to make more changes.

BR
Gabriel.

On 25 June 2015 at 10:41, Gabriel Fernandez
<gabriel.fernandez@...aro.org> wrote:
> Hi Stephen,
>
> Thanks for reviewing
>
>
> On 24 June 2015 at 22:02, Stephen Boyd <sboyd@...eaurora.org> wrote:
>> On 06/23/2015 07:09 AM, Gabriel Fernandez wrote:
>>> In the clk_summary output, the h/w status of DivMux is incorrect
>>> (Parent and Enable status), since the clk_mux_ops.get_parent()
>>> returns -ERRCODE when clock is OFF.
>>>
>>> Signed-off-by: Pankaj Dev <pankaj.dev@...com>
>>> Signed-off-by: Gabriel Fernandez <gabriel.fernandez@...aro.org>
>>> ---
>>>  drivers/clk/st/clkgen-mux.c | 15 +++++++++------
>>>  1 file changed, 9 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/drivers/clk/st/clkgen-mux.c b/drivers/clk/st/clkgen-mux.c
>>> index 4fbe6e0..c94b56b 100644
>>> --- a/drivers/clk/st/clkgen-mux.c
>>> +++ b/drivers/clk/st/clkgen-mux.c
>>> @@ -128,7 +128,7 @@ static int clkgena_divmux_is_enabled(struct clk_hw *hw)
>>>
>>>       __clk_hw_set_clk(mux_hw, hw);
>>>
>>> -     return (s8)clk_mux_ops.get_parent(mux_hw) > 0;
>>> +     return ((s8)clk_mux_ops.get_parent(mux_hw) >= 0);
>>
>> Useless parentheses around it all, please drop.
>>
> Ok
>
>>>  }
>>>
>>>  static u8 clkgena_divmux_get_parent(struct clk_hw *hw)
>>> @@ -138,11 +138,13 @@ static u8 clkgena_divmux_get_parent(struct clk_hw *hw)
>>>
>>>       __clk_hw_set_clk(mux_hw, hw);
>>>
>>> -     genamux->muxsel = clk_mux_ops.get_parent(mux_hw);
>>> -     if ((s8)genamux->muxsel < 0) {
>>> -             pr_debug("%s: %s: Invalid parent, setting to default.\n",
>>> -                   __func__, __clk_get_name(hw->clk));
>>> -             genamux->muxsel = 0;
>>> +     if (genamux->muxsel == CKGAX_CLKOPSRC_SWITCH_OFF) {
>>> +             genamux->muxsel = clk_mux_ops.get_parent(mux_hw);
>>
>> Hm.. maybe we should fix clk_mux_ops to return 0 if it can't find the
>> parent? Or when this clock is registered we should read the hardware and
>> set a default parent so that we can't get an error code here.
>>
> I 'll try the second solution.
>
> Best regards
>
> Gabriel
>> --
>> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
>> a Linux Foundation Collaborative Project
>>
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