linux-kernel - Re: [PATCH] ARM: OMAP4: hwmod: Fix SOFTRESET logic for OMAP4

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Message-ID: <52F3A435.3020209@ti.com>
Date:	Thu, 6 Feb 2014 17:03:17 +0200
From:	Roger Quadros <rogerq@...com>
To:	Illia Smyrnov <illia.smyrnov@...ballogic.com>,
	Benoît Cousson 
	<bcousson@...libre.com>, Paul Walmsley <paul@...an.com>,
	Tony Lindgren <tony@...mide.com>
CC:	Russell King <linux@....linux.org.uk>,
	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: OMAP4: hwmod: Fix SOFTRESET logic for OMAP4

On 02/05/2014 05:06 PM, Illia Smyrnov wrote:
> Commit 313a76e (ARM: OMAP2+: hwmod: Fix SOFTRESET logic) introduced
> softreset bit cleaning right after set one. It is caused L3 error for
> OMAP4 ISS because ISS register write occurs when ISS reset process is in
> progress. Avoid this situation by cleaning softreset bit later, when reset
> process is successfully finished.
> 
> Signed-off-by: Illia Smyrnov <illia.smyrnov@...ballogic.com>

Acked-by: Roger Quadros <rogerq@...com>

> ---
>  arch/arm/mach-omap2/omap_hwmod.c | 20 +++++++++++---------
>  1 file changed, 11 insertions(+), 9 deletions(-)
> 
> diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
> index 42d8188..1f33f5d 100644
> --- a/arch/arm/mach-omap2/omap_hwmod.c
> +++ b/arch/arm/mach-omap2/omap_hwmod.c
> @@ -1947,29 +1947,31 @@ static int _ocp_softreset(struct omap_hwmod *oh)
>  		goto dis_opt_clks;
>  
>  	_write_sysconfig(v, oh);
> -	ret = _clear_softreset(oh, &v);
> -	if (ret)
> -		goto dis_opt_clks;
> -
> -	_write_sysconfig(v, oh);
>  
>  	if (oh->class->sysc->srst_udelay)
>  		udelay(oh->class->sysc->srst_udelay);
>  
>  	c = _wait_softreset_complete(oh);
> -	if (c == MAX_MODULE_SOFTRESET_WAIT)
> +	if (c == MAX_MODULE_SOFTRESET_WAIT) {
>  		pr_warning("omap_hwmod: %s: softreset failed (waited %d usec)\n",
>  			   oh->name, MAX_MODULE_SOFTRESET_WAIT);
> -	else
> +		ret = -ETIMEDOUT;
> +		goto dis_opt_clks;
> +	} else {
>  		pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh->name, c);
> +	}
> +
> +	ret = _clear_softreset(oh, &v);
> +	if (ret)
> +		goto dis_opt_clks;
> +
> +	_write_sysconfig(v, oh);
>  
>  	/*
>  	 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
>  	 * _wait_target_ready() or _reset()
>  	 */
>  
> -	ret = (c == MAX_MODULE_SOFTRESET_WAIT) ? -ETIMEDOUT : 0;
> -
>  dis_opt_clks:
>  	if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
>  		_disable_optional_clocks(oh);
> 

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