From patchwork Tue Jul 28 10:39:04 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adrian Hunter X-Patchwork-Id: 37703 Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id n6SAgdbY011652 for ; Tue, 28 Jul 2009 10:42:40 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752486AbZG1Kiv (ORCPT ); Tue, 28 Jul 2009 06:38:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752639AbZG1Kiv (ORCPT ); Tue, 28 Jul 2009 06:38:51 -0400 Received: from smtp.nokia.com ([192.100.105.134]:16396 "EHLO mgw-mx09.nokia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752486AbZG1Kit (ORCPT ); Tue, 28 Jul 2009 06:38:49 -0400 Received: from vaebh105.NOE.Nokia.com (vaebh105.europe.nokia.com [10.160.244.31]) by mgw-mx09.nokia.com (Switch-3.3.3/Switch-3.3.3) with ESMTP id n6SAbgeX004871; Tue, 28 Jul 2009 05:38:28 -0500 Received: from vaebh104.NOE.Nokia.com ([10.160.244.30]) by vaebh105.NOE.Nokia.com with Microsoft SMTPSVC(6.0.3790.3959); Tue, 28 Jul 2009 13:38:37 +0300 Received: from mgw-da01.ext.nokia.com ([147.243.128.24]) by vaebh104.NOE.Nokia.com over TLS secured channel with Microsoft SMTPSVC(6.0.3790.3959); Tue, 28 Jul 2009 13:38:36 +0300 Received: from [127.0.1.1] (esdhcp04057.research.nokia.com [172.21.40.57]) by mgw-da01.ext.nokia.com (Switch-3.3.3/Switch-3.3.3) with ESMTP id n6SAcS2K003399; Tue, 28 Jul 2009 13:38:29 +0300 From: Adrian Hunter To: Andrew Morton Cc: Jarkko Lavinen , Adrian Hunter , linux-omap Mailing List , Pierre Ossman , Denis Karpov , Matt Fleming , lkml Date: Tue, 28 Jul 2009 13:39:04 +0300 Message-Id: <20090728103904.2371.68231.sendpatchset@ahunter-laptop> In-Reply-To: <20090728103834.2371.65809.sendpatchset@ahunter-laptop> References: <20090728103834.2371.65809.sendpatchset@ahunter-laptop> Subject: [PATCH V2 4/32] mmc: add ability to save power by powering off cards X-OriginalArrivalTime: 28 Jul 2009 10:38:36.0640 (UTC) FILETIME=[90128600:01CA0F6F] X-Nokia-AV: Clean Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org From e6355578d082d94707c8fda1e1342c478019b5c8 Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Mon, 11 May 2009 12:20:57 +0300 Subject: [PATCH] mmc: add ability to save power by powering off cards Power can be saved by powering off cards that are not in use. This is similar to suspend / resume except it is under the control of the driver, and does not require any power management support. It can only be used when the driver can monitor whether the card is removed, otherwise it is unsafe. This is possible because, unlike suspend, the driver still receives card detect and / or cover switch interrupts. Signed-off-by: Adrian Hunter --- drivers/mmc/core/core.c | 34 ++++++++++++++++++++++++++++++++++ drivers/mmc/core/core.h | 2 ++ drivers/mmc/core/mmc.c | 11 +++++++++++ drivers/mmc/core/sd.c | 11 +++++++++++ include/linux/mmc/host.h | 3 +++ 5 files changed, 61 insertions(+), 0 deletions(-) diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index bab5015..39f7bd1 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -1145,6 +1145,40 @@ void mmc_stop_host(struct mmc_host *host) mmc_power_off(host); } +void mmc_power_save_host(struct mmc_host *host) +{ + mmc_bus_get(host); + + if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { + mmc_bus_put(host); + return; + } + + if (host->bus_ops->power_save) + host->bus_ops->power_save(host); + + mmc_bus_put(host); + + mmc_power_off(host); +} +EXPORT_SYMBOL(mmc_power_save_host); + +void mmc_power_restore_host(struct mmc_host *host) +{ + mmc_bus_get(host); + + if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { + mmc_bus_put(host); + return; + } + + mmc_power_up(host); + host->bus_ops->power_restore(host); + + mmc_bus_put(host); +} +EXPORT_SYMBOL(mmc_power_restore_host); + #ifdef CONFIG_PM /** diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h index c819eff..f7eb4c4 100644 --- a/drivers/mmc/core/core.h +++ b/drivers/mmc/core/core.h @@ -20,6 +20,8 @@ struct mmc_bus_ops { void (*detect)(struct mmc_host *); void (*suspend)(struct mmc_host *); void (*resume)(struct mmc_host *); + void (*power_save)(struct mmc_host *); + void (*power_restore)(struct mmc_host *); }; void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops); diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 3e35075..01f7226 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -549,6 +549,14 @@ static void mmc_resume(struct mmc_host *host) } +static void mmc_power_restore(struct mmc_host *host) +{ + host->card->state &= ~MMC_STATE_HIGHSPEED; + mmc_claim_host(host); + mmc_init_card(host, host->ocr, host->card); + mmc_release_host(host); +} + #ifdef CONFIG_MMC_UNSAFE_RESUME static const struct mmc_bus_ops mmc_ops = { @@ -556,6 +564,7 @@ static const struct mmc_bus_ops mmc_ops = { .detect = mmc_detect, .suspend = mmc_suspend, .resume = mmc_resume, + .power_restore = mmc_power_restore, }; static void mmc_attach_bus_ops(struct mmc_host *host) @@ -570,6 +579,7 @@ static const struct mmc_bus_ops mmc_ops = { .detect = mmc_detect, .suspend = NULL, .resume = NULL, + .power_restore = mmc_power_restore, }; static const struct mmc_bus_ops mmc_ops_unsafe = { @@ -577,6 +587,7 @@ static const struct mmc_bus_ops mmc_ops_unsafe = { .detect = mmc_detect, .suspend = mmc_suspend, .resume = mmc_resume, + .power_restore = mmc_power_restore, }; static void mmc_attach_bus_ops(struct mmc_host *host) diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index 80cccd2..debe26e 100644 --- a/drivers/mmc/core/sd.c +++ b/drivers/mmc/core/sd.c @@ -603,6 +603,14 @@ static void mmc_sd_resume(struct mmc_host *host) } +static void mmc_sd_power_restore(struct mmc_host *host) +{ + host->card->state &= ~MMC_STATE_HIGHSPEED; + mmc_claim_host(host); + mmc_sd_init_card(host, host->ocr, host->card); + mmc_release_host(host); +} + #ifdef CONFIG_MMC_UNSAFE_RESUME static const struct mmc_bus_ops mmc_sd_ops = { @@ -610,6 +618,7 @@ static const struct mmc_bus_ops mmc_sd_ops = { .detect = mmc_sd_detect, .suspend = mmc_sd_suspend, .resume = mmc_sd_resume, + .power_restore = mmc_sd_power_restore, }; static void mmc_sd_attach_bus_ops(struct mmc_host *host) @@ -624,6 +633,7 @@ static const struct mmc_bus_ops mmc_sd_ops = { .detect = mmc_sd_detect, .suspend = NULL, .resume = NULL, + .power_restore = mmc_sd_power_restore, }; static const struct mmc_bus_ops mmc_sd_ops_unsafe = { @@ -631,6 +641,7 @@ static const struct mmc_bus_ops mmc_sd_ops_unsafe = { .detect = mmc_sd_detect, .suspend = mmc_sd_suspend, .resume = mmc_sd_resume, + .power_restore = mmc_sd_power_restore, }; static void mmc_sd_attach_bus_ops(struct mmc_host *host) diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index bb867d2..c1cbe59 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -223,6 +223,9 @@ static inline void *mmc_priv(struct mmc_host *host) extern int mmc_suspend_host(struct mmc_host *, pm_message_t); extern int mmc_resume_host(struct mmc_host *); +extern void mmc_power_save_host(struct mmc_host *host); +extern void mmc_power_restore_host(struct mmc_host *host); + extern void mmc_detect_change(struct mmc_host *, unsigned long delay); extern void mmc_request_done(struct mmc_host *, struct mmc_request *);