From: Catalin Marinas <catalin.marinas@arm.com> To: Yilu Mao <ylmao@marvell.com> Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "linux@arm.linux.org.uk" <linux@arm.linux.org.uk>, "Baohua.Song@csr.com" <Baohua.Song@csr.com>, "santosh.shilimkar@ti.com" <santosh.shilimkar@ti.com>, "robherring2@gmail.com" <robherring2@gmail.com>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org> Subject: Re: [PATCH] ARM: cache-l2x0.c: save aux ctrl for resume in case that l2x0 is enabled before init Date: Tue, 24 Apr 2012 09:28:10 +0100 [thread overview] Message-ID: <20120424082810.GA9367@arm.com> (raw) In-Reply-To: <1335235280-25148-1-git-send-email-ylmao@marvell.com> On Tue, Apr 24, 2012 at 03:41:20AM +0100, Yilu Mao wrote: > If l2x0 controller has been enabled when calling l2x0_init, the aux ctrl > register will not be saved in l2x0_saved_regs. Therefore we can not use > l2x0_saved_regs.aux_ctrl for resume later. This patch fixed the problem > by saving aux ctrl in l2x0_saved_regs just after it's being read from > the register. > > Signed-off-by: Yilu Mao <ylmao@marvell.com> > --- > arch/arm/mm/cache-l2x0.c | 6 ++++++ > 1 files changed, 6 insertions(+), 0 deletions(-) > > diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c > index a53fd2a..3034b06 100644 > --- a/arch/arm/mm/cache-l2x0.c > +++ b/arch/arm/mm/cache-l2x0.c > @@ -320,6 +320,12 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask) > cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID); > aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL); > > + /* In case l2x controller is enabled, the aux ctrl register > + * can't be set. So the original value should be stored in > + * the l2x0_saved_regs for restoring when resume. > + */ Even better like this ;) + /* + * In case l2x controller is enabled, the aux ctrl register + * can't be set. So the original value should be stored in + * the l2x0_saved_regs for restoring when resume. + */ > + l2x0_saved_regs.aux_ctrl = aux; > + > aux &= aux_mask; > aux |= aux_val; I think that's the wrong place to save it, it should be after the masking was done. Anyway, if we cannot write this register in l2x0_init() because the L2 was enabled, do we expect the L2 to be disabled during resume? -- Catalin
WARNING: multiple messages have this Message-ID (diff)
From: catalin.marinas@arm.com (Catalin Marinas) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH] ARM: cache-l2x0.c: save aux ctrl for resume in case that l2x0 is enabled before init Date: Tue, 24 Apr 2012 09:28:10 +0100 [thread overview] Message-ID: <20120424082810.GA9367@arm.com> (raw) In-Reply-To: <1335235280-25148-1-git-send-email-ylmao@marvell.com> On Tue, Apr 24, 2012 at 03:41:20AM +0100, Yilu Mao wrote: > If l2x0 controller has been enabled when calling l2x0_init, the aux ctrl > register will not be saved in l2x0_saved_regs. Therefore we can not use > l2x0_saved_regs.aux_ctrl for resume later. This patch fixed the problem > by saving aux ctrl in l2x0_saved_regs just after it's being read from > the register. > > Signed-off-by: Yilu Mao <ylmao@marvell.com> > --- > arch/arm/mm/cache-l2x0.c | 6 ++++++ > 1 files changed, 6 insertions(+), 0 deletions(-) > > diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c > index a53fd2a..3034b06 100644 > --- a/arch/arm/mm/cache-l2x0.c > +++ b/arch/arm/mm/cache-l2x0.c > @@ -320,6 +320,12 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask) > cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID); > aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL); > > + /* In case l2x controller is enabled, the aux ctrl register > + * can't be set. So the original value should be stored in > + * the l2x0_saved_regs for restoring when resume. > + */ Even better like this ;) + /* + * In case l2x controller is enabled, the aux ctrl register + * can't be set. So the original value should be stored in + * the l2x0_saved_regs for restoring when resume. + */ > + l2x0_saved_regs.aux_ctrl = aux; > + > aux &= aux_mask; > aux |= aux_val; I think that's the wrong place to save it, it should be after the masking was done. Anyway, if we cannot write this register in l2x0_init() because the L2 was enabled, do we expect the L2 to be disabled during resume? -- Catalin
next prev parent reply other threads:[~2012-04-24 8:28 UTC|newest] Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-04-24 2:41 [PATCH] ARM: cache-l2x0.c: save aux ctrl for resume in case that l2x0 is enabled before init Yilu Mao 2012-04-24 2:41 ` Yilu Mao 2012-04-24 8:28 ` Catalin Marinas [this message] 2012-04-24 8:28 ` Catalin Marinas 2012-04-26 5:00 ` Yilu Mao 2012-04-26 5:00 ` Yilu Mao 2012-04-26 8:35 ` Catalin Marinas 2012-04-26 8:35 ` Catalin Marinas 2012-04-26 9:25 ` Yilu Mao 2012-04-26 9:25 ` Yilu Mao 2012-04-26 9:44 ` Catalin Marinas 2012-04-26 9:44 ` Catalin Marinas 2012-04-26 10:09 ` Yilu Mao 2012-04-26 10:09 ` Yilu Mao 2012-04-26 10:28 ` Catalin Marinas 2012-04-26 10:28 ` Catalin Marinas 2012-04-26 10:35 ` Yilu Mao 2012-04-26 10:35 ` Yilu Mao 2012-04-26 10:38 ` Catalin Marinas 2012-04-26 10:38 ` Catalin Marinas 2012-04-26 10:48 ` Yilu Mao 2012-04-26 10:48 ` Yilu Mao 2012-04-26 10:56 ` Catalin Marinas 2012-04-26 10:56 ` Catalin Marinas 2012-04-26 11:03 ` Yilu Mao 2012-04-26 11:03 ` Yilu Mao 2012-04-28 6:24 ` Yilu Mao 2012-04-28 6:24 ` Yilu Mao 2012-04-30 12:11 ` Catalin Marinas 2012-04-30 12:11 ` Catalin Marinas 2012-04-30 13:22 ` Yilu Mao 2012-04-30 13:22 ` Yilu Mao 2012-04-26 5:09 ` Yilu Mao 2012-04-26 5:09 ` Yilu Mao -- strict thread matches above, loose matches on Subject: below -- 2012-04-23 7:43 Yilu Mao 2012-04-23 7:43 ` Yilu Mao 2012-04-23 11:19 ` Sergei Shtylyov 2012-04-23 11:19 ` Sergei Shtylyov
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