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Message-ID: <20151012135350.0f127fa3@xhacker> Date: Mon, 12 Oct 2015 13:53:50 +0800 From: Jisheng Zhang <jszhang@...vell.com> To: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com> CC: <linux@....linux.org.uk>, <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org> Subject: Re: [PATCH RESEND 1/2] arm: berlin: use non-self-cleared reset register to reset cpu Dear Sebastian, On Mon, 21 Sep 2015 10:18:25 +0800 Jisheng Zhang <jszhang@...vell.com> wrote: > Dear Sebastian, > > On Sun, 20 Sep 2015 20:04:01 +0200 > Sebastian Hesselbarth <sebastian.hesselbarth@...il.com> wrote: > > > On 14.09.2015 08:47, Jisheng Zhang wrote: > > > In Berlin SoCs, there are two kinds of cpu reset control registers: the > > > first one's corresponding bits will be self-cleared after some cycles, > > > while the second one's bits won't. Previously the first kind of reset > > > control register is used, this patch uses the second kind one to prepare > > > for the next hotplug commit. > > > > > > Signed-off-by: Jisheng Zhang <jszhang@...vell.com> > > > --- > > > arch/arm/mach-berlin/platsmp.c | 4 +++- > > > 1 file changed, 3 insertions(+), 1 deletion(-) > > > > > > diff --git a/arch/arm/mach-berlin/platsmp.c b/arch/arm/mach-berlin/platsmp.c > > > index 34a3753..bde327b 100644 > > > --- a/arch/arm/mach-berlin/platsmp.c > > > +++ b/arch/arm/mach-berlin/platsmp.c > > > @@ -17,7 +17,7 @@ > > > #include <asm/smp_plat.h> > > > #include <asm/smp_scu.h> > > > > > > -#define CPU_RESET 0x00 > > > +#define CPU_RESET 0x20 > > > > Jisheng, > > > > I am fine with the patch itself, except that I'd like to rather > > rename the 0x00-register to CPU_RESET_SC with a comment about > > the self-clearing nature. The 0x20-register would then be named > > CPU_RESET_NON_SC and used the way you propose. > > Good idea. And such comment would let people understand why do we change > as that. > > > > > Are you fine with me naming the registers accordingly while > > applying the patches? > > Sure, I'm fine. Thank you very much. I found these two patches are missing in your round 1 berlin pull request. Do you want me send v2 patches applying the above changes you suggested? Thanks, Jisheng > > > > > Sebastian > > > > > #define RESET_VECT 0x00 > > > #define SW_RESET_ADDR 0x94 > > > @@ -31,6 +31,8 @@ static inline void berlin_perform_reset_cpu(unsigned int cpu) > > > u32 val; > > > > > > val = readl(cpu_ctrl + CPU_RESET); > > > + val &= ~BIT(cpu_logical_map(cpu)); > > > + writel(val, cpu_ctrl + CPU_RESET); > > > val |= BIT(cpu_logical_map(cpu)); > > > writel(val, cpu_ctrl + CPU_RESET); > > > } > > > > > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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