linux-kernel - Re: [PATCH] ARM: OMAP5: Redo THUMB mode switch on secondary CPU

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Message-ID: <20140430094348.GA3986@e103592.cambridge.arm.com>
Date:	Wed, 30 Apr 2014 10:43:56 +0100
From:	Dave Martin <Dave.Martin@....com>
To:	Joel Fernandes <joelf@...com>
Cc:	Tony Lindgren <tony@...mide.com>, Nishanth Menon <nm@...com>,
	Russell King <linux@....linux.org.uk>,
	open list <linux-kernel@...r.kernel.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	"open list:OMAP SUPPORT" <linux-omap@...r.kernel.org>,
	"moderated list:ARM SUB-ARCHITECT..." 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM: OMAP5: Redo THUMB mode switch on secondary CPU

On Tue, Apr 29, 2014 at 09:53:47PM -0500, Joel Fernandes wrote:
> Here's a redo of the patch [1] that effectively does the same
> thing but is the right way to do things by using ENDPROC instead.
> The firmware correctly switches to THUMB before entry.
> 
> The patch applies ontop of the earlier patch [1].
> 
> [1] https://lkml.org/lkml/2014/4/22/1044
> 
> Suggested-by: Dave Martin <Dave.Martin@....com>
> Cc: Dave Martin <Dave.Martin@....com>
> Cc: Santosh Shilimkar <santosh.shilimkar@...com>
> Cc: Russell King <linux@....linux.org.uk>
> Cc: Nishanth Menon <nm@...com>
> Cc: Tony Lindgren <tony@...mide.com>
> Signed-off-by: Joel Fernandes <joelf@...com>

Looks OK to me.

This also makes omap5 consistent with omap3/4 here.

Reviewed-by: Dave Martin <Dave.Martin@....com>

> ---
> 
> Tony, the earlier patch went into your fixes, and can remain. This patch is just a simple redo of the same and can go in for v3.16, no problem. Thanks.
> 
>  arch/arm/mach-omap2/omap-headsmp.S |    6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/arch/arm/mach-omap2/omap-headsmp.S b/arch/arm/mach-omap2/omap-headsmp.S
> index 1809dce..bf36f26 100644
> --- a/arch/arm/mach-omap2/omap-headsmp.S
> +++ b/arch/arm/mach-omap2/omap-headsmp.S
> @@ -31,10 +31,6 @@
>   * register AuxCoreBoot0.
>   */
>  ENTRY(omap5_secondary_startup)
> -.arm
> -THUMB( adr     r9, BSYM(wait)  )       @ CPU may be entered in ARM mode.
> -THUMB( bx      r9              )       @ If this is a Thumb-2 kernel,
> -THUMB( .thumb                  )       @ switch to Thumb now.
>  wait:	ldr	r2, =AUX_CORE_BOOT0_PA	@ read from AuxCoreBoot0
>  	ldr	r0, [r2]
>  	mov	r0, r0, lsr #5
> @@ -43,7 +39,7 @@ wait:	ldr	r2, =AUX_CORE_BOOT0_PA	@ read from AuxCoreBoot0
>  	cmp	r0, r4
>  	bne	wait
>  	b	secondary_startup
> -END(omap5_secondary_startup)
> +ENDPROC(omap5_secondary_startup)
>  /*
>   * OMAP4 specific entry point for secondary CPU to jump from ROM
>   * code.  This routine also provides a holding flag into which
> -- 
> 1.7.9.5
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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