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

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Date:	Wed, 24 Jun 2015 13:02:31 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Gabriel Fernandez <gabriel.fernandez@...aro.org>,
	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>
CC:	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, kernel@...inux.com,
	linux-clk@...r.kernel.org
Subject: Re: [PATCH 1/9] drivers: clk: st: Incorrect clocks status

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.

>  }
>  
>  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.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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