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90 lines
3.5 KiB
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From: Colin Cross <ccross@android.com>
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Subject: [PATCH] ARM: vfp: Always save VFP state in vfp_pm_suspend
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Date: Sun, 13 Feb 2011 15:13:33 -0800
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Lines: 45
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Message-ID: <1297638813-1315-1-git-send-email-ccross@android.com>
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Cc: Colin Cross <ccross@android.com>,
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Catalin Marinas <catalin.marinas@arm.com>,
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Russell King <linux@arm.linux.org.uk>,
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linux-kernel@vger.kernel.org
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To: linux-arm-kernel@lists.infradead.org
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Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/1099558>
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vfp_pm_suspend should save the VFP state any time there is
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a last_VFP_context. If it only saves when the VFP is enabled,
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the state can get lost when, on a UP system:
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Thread 1 uses the VFP
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Context switch occurs to thread 2, VFP is disabled but the
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VFP context is not saved to allow lazy save and restore
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Thread 2 initiates suspend
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vfp_pm_suspend is called with the VFP disabled, but the
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context has not been saved.
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Modify vfp_pm_suspend to save the VFP context whenever
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last_VFP_context is set.
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Cc: Catalin Marinas <catalin.marinas@arm.com>
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Signed-off-by: Colin Cross <ccross@android.com>
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---
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arch/arm/vfp/vfpmodule.c | 11 +++++------
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1 files changed, 5 insertions(+), 6 deletions(-)
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diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c
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index 66bf8d1..7aea616 100644
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--- a/arch/arm/vfp/vfpmodule.c
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+++ b/arch/arm/vfp/vfpmodule.c
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@@ -415,13 +415,12 @@ static int vfp_pm_suspend(struct sys_device *dev, pm_message_t state)
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struct thread_info *ti = current_thread_info();
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u32 fpexc = fmrx(FPEXC);
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- /* if vfp is on, then save state for resumption */
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- if (fpexc & FPEXC_EN) {
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+ /* save state for resume */
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+ if (last_VFP_context[ti->cpu]) {
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printk(KERN_DEBUG "%s: saving vfp state\n", __func__);
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- vfp_save_state(&ti->vfpstate, fpexc);
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-
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- /* disable, just in case */
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- fmxr(FPEXC, fmrx(FPEXC) & ~FPEXC_EN);
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+ fmxr(FPEXC, fpexc | FPEXC_EN);
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+ vfp_save_state(last_VFP_context[ti->cpu], fpexc);
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+ fmxr(FPEXC, fpexc & ~FPEXC_EN);
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}
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/* clear any information we had about last context state */
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--
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1.7.3.1
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