From patchwork Wed Sep 9 11:58:57 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adrian Hunter X-Patchwork-Id: 46376 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 n89BxXhi008594 for ; Wed, 9 Sep 2009 11:59:34 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753203AbZIIL71 (ORCPT ); Wed, 9 Sep 2009 07:59:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753179AbZIIL71 (ORCPT ); Wed, 9 Sep 2009 07:59:27 -0400 Received: from smtp.nokia.com ([192.100.105.134]:51618 "EHLO mgw-mx09.nokia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753193AbZIIL70 (ORCPT ); Wed, 9 Sep 2009 07:59:26 -0400 Received: from esebh105.NOE.Nokia.com (esebh105.ntc.nokia.com [172.21.138.211]) by mgw-mx09.nokia.com (Switch-3.3.3/Switch-3.3.3) with ESMTP id n89BvVSV022520; Wed, 9 Sep 2009 06:58:15 -0500 Received: from vaebh104.NOE.Nokia.com ([10.160.244.30]) by esebh105.NOE.Nokia.com with Microsoft SMTPSVC(6.0.3790.3959); Wed, 9 Sep 2009 14:58:40 +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); Wed, 9 Sep 2009 14:58:36 +0300 Received: from [127.0.1.1] (esdhcp041173.research.nokia.com [172.21.41.173]) by mgw-da01.ext.nokia.com (Switch-3.3.3/Switch-3.3.3) with ESMTP id n89BwRjZ008640; Wed, 9 Sep 2009 14:58:28 +0300 From: Adrian Hunter To: Andrew Morton Cc: Jarkko Lavinen , Adrian Hunter , Madhusudhan Chikkature , Pierre Ossman , linux-omap Mailing List , linux-mmc Mailing List , Matt Fleming Date: Wed, 09 Sep 2009 14:58:57 +0300 Message-Id: <20090909115857.12833.49517.sendpatchset@ahunter-laptop> In-Reply-To: <20090909115633.12833.39619.sendpatchset@ahunter-laptop> References: <20090909115633.12833.39619.sendpatchset@ahunter-laptop> Subject: [PATCH V3 19/30] omap_hsmmc: put MMC regulator to sleep X-OriginalArrivalTime: 09 Sep 2009 11:58:36.0554 (UTC) FILETIME=[DCCE86A0:01CA3144] Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org From 0c1e00cc0560fe27deb79c8d132677c9f190ad15 Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Tue, 12 May 2009 20:54:51 +0300 Subject: [PATCH] omap_hsmmc: put MMC regulator to sleep When a card is not in use, the voltage regulator can be put to sleep. This is an alternative to powering the card off, when powering off is not safe because the card might be replaced without the driver being aware of it. That situation happens if: - the card is removable i.e. not eMMC - and there is no card detect - and there is a cover switch but the cover is open Signed-off-by: Adrian Hunter --- drivers/mmc/host/omap_hsmmc.c | 59 +++++++++++++++++++++++++++++++++++++--- 1 files changed, 54 insertions(+), 5 deletions(-) diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c index acb7a78..cf6023b 100644 --- a/drivers/mmc/host/omap_hsmmc.c +++ b/drivers/mmc/host/omap_hsmmc.c @@ -160,6 +160,7 @@ struct mmc_omap_host { int response_busy; int context_loss; int dpm_state; + int vdd; struct omap_mmc_platform_data *pdata; }; @@ -1031,10 +1032,12 @@ static void omap_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) case MMC_POWER_OFF: mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0); + host->vdd = 0; break; case MMC_POWER_UP: mmc_slot(host).set_power(host->dev, host->slot_id, 1, ios->vdd); + host->vdd = ios->vdd; break; case MMC_POWER_ON: do_send_init_stream = 1; @@ -1172,19 +1175,20 @@ static void omap_hsmmc_init(struct mmc_omap_host *host) /* * Dynamic power saving handling, FSM: - * ENABLED -> DISABLED -> OFF + * ENABLED -> DISABLED -> OFF / REGSLEEP * ^___________| | * |______________________| * * ENABLED: mmc host is fully functional * DISABLED: fclk is off * OFF: fclk is off,voltage regulator is off + * REGSLEEP: fclk is off,voltage regulator is asleep * * Transition handlers return the timeout for the next state transition * or negative error. */ -enum {ENABLED = 0, DISABLED, OFF}; +enum {ENABLED = 0, DISABLED, REGSLEEP, OFF}; /* Handler for [ENABLED -> DISABLED] transition */ static int omap_mmc_enabled_to_disabled(struct mmc_omap_host *host) @@ -1221,8 +1225,12 @@ static int omap_mmc_disabled_to_off(struct mmc_omap_host *host) mmc_slot(host).get_cover_state(host->dev, host->slot_id))) { mmc_power_save_host(host->mmc); new_state = OFF; - } else - new_state = DISABLED; + } else { + if (mmc_slot(host).set_sleep) + mmc_slot(host).set_sleep(host->dev, host->slot_id, + 1, 0, 0); + new_state = REGSLEEP; + } OMAP_HSMMC_WRITE(host->base, ISE, 0); OMAP_HSMMC_WRITE(host->base, IE, 0); @@ -1279,6 +1287,44 @@ static int omap_mmc_off_to_enabled(struct mmc_omap_host *host) return 0; } +/* Handler for [REGSLEEP -> ENABLED] transition */ +static int omap_mmc_regsleep_to_enabled(struct mmc_omap_host *host) +{ + unsigned long timeout; + + dev_dbg(mmc_dev(host->mmc), "REGSLEEP -> ENABLED\n"); + + clk_enable(host->fclk); + clk_enable(host->iclk); + + if (clk_enable(host->dbclk)) + dev_dbg(mmc_dev(host->mmc), + "Enabling debounce clk failed\n"); + + omap_mmc_restore_ctx(host); + + /* + * We turned off interrupts and bus power. Interrupts + * are turned on by 'mmc_omap_start_command()' so we + * just need to turn on the bus power here. + */ + OMAP_HSMMC_WRITE(host->base, HCTL, + OMAP_HSMMC_READ(host->base, HCTL) | SDBP); + + timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS); + while ((OMAP_HSMMC_READ(host->base, HCTL) & SDBP) != SDBP && + time_before(jiffies, timeout)) + ; + + if (mmc_slot(host).set_sleep) + mmc_slot(host).set_sleep(host->dev, host->slot_id, + 0, host->vdd, 0); + + host->dpm_state = ENABLED; + + return 0; +} + /* * Bring MMC host to ENABLED from any other PM state. */ @@ -1289,6 +1335,8 @@ static int omap_mmc_enable(struct mmc_host *mmc) switch (host->dpm_state) { case DISABLED: return omap_mmc_disabled_to_enabled(host); + case REGSLEEP: + return omap_mmc_regsleep_to_enabled(host); case OFF: return omap_mmc_off_to_enabled(host); default: @@ -1386,7 +1434,8 @@ static int mmc_regs_show(struct seq_file *s, void *data) host->dpm_state, mmc->nesting_cnt, host->context_loss, context_loss); - if (host->suspended || host->dpm_state == OFF) { + if (host->suspended || host->dpm_state == OFF || + host->dpm_state == REGSLEEP) { seq_printf(s, "host suspended, can't read registers\n"); return 0; }