linux-kernel - Re: [PATCH] ARM: OMAP2+: hwmod: Fix _wait_target

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Message-ID: <54AD166C.9060507@ti.com>
Date:	Wed, 7 Jan 2015 13:20:12 +0200
From:	Roger Quadros <rogerq@...com>
To:	Paul Walmsley <paul@...an.com>, Lokesh Vutla <lokeshvutla@...com>
CC:	<tony@...mide.com>, <santosh.shilimkar@...cle.com>,
	<t-kristo@...com>, <nm@...com>, <nsekhar@...com>,
	<bcousson@...libre.com>, <linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <s-anna@...com>
Subject: Re: [PATCH] ARM: OMAP2+: hwmod: Fix _wait_target_ready() for hwmods
 without sysc

On 06/01/15 04:04, Paul Walmsley wrote:
> 
> Roger, Lokesh, could you try this one instead?
> 
> It passes all the basic tests here except it does not boot on the 4460 
> VAR-SOM-OM - unclear why at this point - but it would be good to see if it 
> works on your AM4372 boards, since I don't have that one.
> 
> Test logs are here:
> 
> http://www.pwsan.com/omap/testlogs/hwmod_skip_only_remap_v3.19-rc/20150105171744/
> 
> 
> - Paul
> 
> 
> From 4f2e13bd2181e0ebede3aabc484aa2339830748a Mon Sep 17 00:00:00 2001
> From: Paul Walmsley <paul@...an.com>
> Date: Mon, 5 Jan 2015 15:49:57 -0700
> Subject: [PATCH] Only skip ioremap() if IP block does not have OCP header
>  registers. Experimental.
> 
> ---
>  arch/arm/mach-omap2/omap_hwmod.c | 33 +++++++++++++++++++++------------
>  1 file changed, 21 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
> index cbb908dc5cf0..03df8833d399 100644
> --- a/arch/arm/mach-omap2/omap_hwmod.c
> +++ b/arch/arm/mach-omap2/omap_hwmod.c
> @@ -1938,6 +1938,8 @@ static int _reset(struct omap_hwmod *oh)
>  	pr_debug("omap_hwmod: %s: resetting\n", oh->name);
>  
>  	if (oh->class->reset) {
> +		WARN(!oh->_mpu_rt_va, "Attempt to call custom reset with no MPU register target ioremapped: %s",
> +		     oh->name);

Not part of $subject.

>  		r = oh->class->reset(oh);
>  	} else {
>  		if (oh->rst_lines_cnt > 0) {
> @@ -2358,15 +2360,19 @@ static int of_dev_hwmod_lookup(struct device_node *np,
>  }
>  
>  /**
> - * _init_mpu_rt_base - populate the virtual address for a hwmod
> + * _init_mpu_rt_base - populate the MPU port and virtual address
>   * @oh: struct omap_hwmod * to locate the virtual address
>   * @data: (unused, caller should pass NULL)
>   * @index: index of the reg entry iospace in device tree
>   * @np: struct device_node * of the IP block's device node in the DT data
>   *
> - * Cache the virtual address used by the MPU to access this IP block's
> - * registers.  This address is needed early so the OCP registers that
> - * are part of the device's address space can be ioremapped properly.
> + * Cache the interconnect target port and the virtual address used by
> + * the MPU to access this IP block's registers.  The address is needed
> + * early so the OCP registers that are part of the device's address
> + * space can be ioremapped properly.  The presence or absence of the
> + * interconnect target port also indicates whether the hwmod code
> + * should wait for the IP block to indicate readiness after it is
> + * enabled.
>   *
>   * Returns 0 on success, -EINVAL if an invalid hwmod is passed, and
>   * -ENXIO on absent or invalid register target address space.
> @@ -2385,6 +2391,13 @@ static int __init _init_mpu_rt_base(struct omap_hwmod *oh, void *data,
>  	if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
>  		return -ENXIO;
>  
> +	/*
> +	 * If there's no need for the hwmod code to read or write to
> +	 * the IP block registers, bail out early before the ioremap()
> +	 */
> +	if (!oh->class->sysc)
> +		return 0;
> +
>  	mem = _find_mpu_rt_addr_space(oh);
>  	if (!mem) {
>  		pr_debug("omap_hwmod: %s: no MPU register target found\n",
> @@ -2451,14 +2464,10 @@ static int __init _init(struct omap_hwmod *oh, void *data)
>  				oh->name, np->name);
>  	}
>  
> -	if (oh->class->sysc) {
> -		r = _init_mpu_rt_base(oh, NULL, index, np);
> -		if (r < 0) {
> -			WARN(1, "omap_hwmod: %s: doesn't have mpu register target base\n",
> -			     oh->name);
> -			return 0;
> -		}
> -	}
> +	r = _init_mpu_rt_base(oh, NULL, index, np);
> +	if (r < 0)
> +		pr_debug("omap_hwmod: %s: doesn't have mpu register target base\n",
> +			 oh->name);

This is the real piece that fixes the issue.

>  
>  	r = _init_clocks(oh, NULL);
>  	if (r < 0) {
> 

I've tested this patch on am43x-gp-evm, and it seems to fix the issue although with some unpleasant warning messages.
So if we can get rid of the WARN() you can put my

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

cheers,
-roger

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