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

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Message-ID: <CAG374jAE78p_4=MYg9iNqo-4j8gE5OspzKwphfBUBtr5iOx-1g@mail.gmail.com>
Date:	Thu, 25 Jun 2015 10:41:22 +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,

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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