Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754916AbbBLCyO (ORCPT ); Wed, 11 Feb 2015 21:54:14 -0500 Received: from nasmtp01.atmel.com ([192.199.1.246]:46466 "EHLO DVREDG02.corp.atmel.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754723AbbBLCyL (ORCPT ); Wed, 11 Feb 2015 21:54:11 -0500 From: Wenyou Yang To: , , CC: , , , , , , , , Subject: [PATCH 1/3] pm: at91: pm_suspend: add the WFI instruction support for ARMv7 Date: Thu, 12 Feb 2015 10:51:26 +0800 Message-ID: <1423709486-8382-1-git-send-email-wenyou.yang@atmel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1423709441-8342-1-git-send-email-wenyou.yang@atmel.com> References: <1423709441-8342-1-git-send-email-wenyou.yang@atmel.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1238 Lines: 54 Add the WFI instruction to make the cpu to the idle state. In the meanwhile, disable the processor's clock. Signed-off-by: Wenyou Yang --- arch/arm/mach-at91/pm_suspend.S | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) diff --git a/arch/arm/mach-at91/pm_suspend.S b/arch/arm/mach-at91/pm_suspend.S index bebe3de..1c7256a 100644 --- a/arch/arm/mach-at91/pm_suspend.S +++ b/arch/arm/mach-at91/pm_suspend.S @@ -51,6 +51,24 @@ tmp2 .req r5 beq 1b .endm +/* + * Put the processor to enter the idle state + */ + .macro at91_cpu_idle + +#if defined(CONFIG_CPU_V7) + mov tmp1, #AT91_PMC_PCK + str tmp1, [pmc, #AT91_PMC_SCDR] + + dsb + + wfi @ Wait For Interrupt +#else + mcr p15, 0, tmp1, c7, c0, 4 +#endif + + .endm + .text /* @@ -120,7 +138,7 @@ skip_disable_main_clock: ldr pmc, .pmc_base /* Wait for interrupt */ - mcr p15, 0, tmp1, c7, c0, 4 + at91_cpu_idle ldr r0, .pm_mode tst r0, #AT91_PM_SLOW_CLOCK -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/