From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S939608AbdAFHIz (ORCPT ); Fri, 6 Jan 2017 02:08:55 -0500 Received: from nasmtp01.atmel.com ([192.199.1.246]:23592 "EHLO ussmtp01.atmel.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753592AbdAFHIw (ORCPT ); Fri, 6 Jan 2017 02:08:52 -0500 X-Greylist: delayed 304 seconds by postgrey-1.27 at vger.kernel.org; Fri, 06 Jan 2017 02:08:52 EST From: Wenyou Yang To: Alexandre Belloni , Russell King , Nicolas Ferre , "Rob Herring" , Mark Rutland CC: , Wenyou Yang , , , Wenyou Yang Subject: [PATCH 1/3] ARM: at91: flush the L2 cache before entering cpu idle Date: Fri, 6 Jan 2017 14:59:45 +0800 Message-ID: <20170106065947.30631-2-wenyou.yang@atmel.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170106065947.30631-1-wenyou.yang@atmel.com> References: <20170106065947.30631-1-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 For the SoCs such as SAMA5D2 and SAMA5D4 which have L2 cache, flush the L2 cache first before entering the cpu idle. Signed-off-by: Wenyou Yang --- arch/arm/mach-at91/pm.c | 19 +++++++++++++++++++ drivers/memory/atmel-sdramc.c | 1 + 2 files changed, 20 insertions(+) diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c index b4332b727e9c..1a60dede1a01 100644 --- a/arch/arm/mach-at91/pm.c +++ b/arch/arm/mach-at91/pm.c @@ -289,6 +289,24 @@ static void at91_ddr_standby(void) at91_ramc_write(1, AT91_DDRSDRC_LPR, saved_lpr1); } +static void at91_ddr_cache_standby(void) +{ + u32 saved_lpr; + + flush_cache_all(); + outer_disable(); + + saved_lpr = at91_ramc_read(0, AT91_DDRSDRC_LPR); + at91_ramc_write(0, AT91_DDRSDRC_LPR, (saved_lpr & + (~AT91_DDRSDRC_LPCB)) | AT91_DDRSDRC_LPCB_SELF_REFRESH); + + cpu_do_idle(); + + at91_ramc_write(0, AT91_DDRSDRC_LPR, saved_lpr); + + outer_resume(); +} + /* We manage both DDRAM/SDRAM controllers, we need more than one value to * remember. */ @@ -324,6 +342,7 @@ static const struct of_device_id const ramc_ids[] __initconst = { { .compatible = "atmel,at91sam9260-sdramc", .data = at91sam9_sdram_standby }, { .compatible = "atmel,at91sam9g45-ddramc", .data = at91_ddr_standby }, { .compatible = "atmel,sama5d3-ddramc", .data = at91_ddr_standby }, + { .compatible = "atmel,sama5d4-ddramc", .data = at91_ddr_cache_standby }, { /*sentinel*/ } }; diff --git a/drivers/memory/atmel-sdramc.c b/drivers/memory/atmel-sdramc.c index b418b39af180..7e5c5c6c1348 100644 --- a/drivers/memory/atmel-sdramc.c +++ b/drivers/memory/atmel-sdramc.c @@ -48,6 +48,7 @@ static const struct of_device_id atmel_ramc_of_match[] = { { .compatible = "atmel,at91sam9260-sdramc", .data = &at91rm9200_caps, }, { .compatible = "atmel,at91sam9g45-ddramc", .data = &at91sam9g45_caps, }, { .compatible = "atmel,sama5d3-ddramc", .data = &sama5d3_caps, }, + { .compatible = "atmel,sama5d4-ddramc", .data = &sama5d3_caps, }, {}, }; -- 2.11.0