From patchwork Thu Feb 27 21:42:23 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 3736211 Return-Path: X-Original-To: patchwork-linux-mmc@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 593F1BF13A for ; Thu, 27 Feb 2014 21:42:42 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 2099E2024D for ; Thu, 27 Feb 2014 21:42:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D0902201FE for ; Thu, 27 Feb 2014 21:42:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751580AbaB0Vmi (ORCPT ); Thu, 27 Feb 2014 16:42:38 -0500 Received: from mho-03-ewr.mailhop.org ([204.13.248.66]:47922 "EHLO mho-01-ewr.mailhop.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750942AbaB0Vmh (ORCPT ); Thu, 27 Feb 2014 16:42:37 -0500 Received: from 99-127-230-128.lightspeed.sntcca.sbcglobal.net ([99.127.230.128] helo=atomide.com) by mho-01-ewr.mailhop.org with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.72) (envelope-from ) id 1WJ8ix-00051e-2v; Thu, 27 Feb 2014 21:42:36 +0000 X-Mail-Handler: Dyn Standard SMTP by Dyn X-Originating-IP: 99.127.230.128 X-Report-Abuse-To: abuse@dyndns.com (see http://www.dyndns.com/services/sendlabs/outbound_abuse.html for abuse reporting information) X-MHO-User: U2FsdGVkX19O4keBCWxOxNTAFmaxgReq Date: Thu, 27 Feb 2014 13:42:23 -0800 From: Tony Lindgren To: Andreas Fenkart Cc: Chris Ball , Grant Likely , Felipe Balbi , Balaji T K , zonque@gmail.com, galak@codeaurora.org, linux-doc@vger.kernel.org, linux-mmc@vger.kernel.org, linux-omap@vger.kernel.org Subject: Re: [PATCH v7 2/4] mmc: omap_hsmmc: Remux SDIO pins within driver. Message-ID: <20140227214223.GN11654@atomide.com> References: <1393331866-28307-1-git-send-email-afenkart@gmail.com> <1393331866-28307-3-git-send-email-afenkart@gmail.com> <20140227213625.GK11654@atomide.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20140227213625.GK11654@atomide.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP * Tony Lindgren [140227 13:40]: > * Andreas Fenkart [140225 04:49]: > > This is a preparation for the am335x workaround where we reconfigure > > dat1 as GPIO before going to suspend. If you don't specify active/idle > > pinctrl there should be no change. > > I've updated this too, hope it still works for you. And there's no > need for patch 3/4, that's merged into this one as well. > - if (host->pdata->controller_flags & OMAP_HSMMC_SWAKEUP_MISSING) > + if (host->pdata->controller_flags & OMAP_HSMMC_SWAKEUP_MISSING) { > + if (!host->idle) { > + free_irq(host->wake_irq); Oops, this one was missing some uncommitted changes. Updated patch below. Tony 8< ---------------------------------------------- From: Andreas Fenkart Date: Tue, 25 Feb 2014 13:37:44 +0100 Subject: [PATCH] mmc: omap_hsmmc: Pin remux workaround to support SDIO interrupt on AM335x The am335x can't detect pending cirq in PM runtime suspend. This patch reconfigures dat1 as a GPIO before going to suspend. SDIO interrupts are detected with the GPIO, the GPIO will only wake the module from suspend, SDIO irq detection will still happen through the IP block. Idea of remuxing the pins and some minor changes by Tony Lindgren. Signed-off-by: Andreas Fenkart Signed-off-by: Tony Lindgren --- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt index 8c8908a..8e1195e 100644 --- a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt +++ b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt @@ -55,3 +55,53 @@ Examples: &edma 25>; dma-names = "tx", "rx"; }; + +[workaround for missing swakeup on am33xx] + +This SOC is missing the swakeup line, it will not detect SDIO irq +while in suspend. + + ------ + | PRCM | + ------ + ^ | + swakeup | | fclk + | v + ------ ------- ----- + | card | -- CIRQ --> | hsmmc | -- IRQ --> | CPU | + ------ ------- ----- + +In suspend the fclk is off and the module is disfunctional. Even +register reads will fail. A small logic in the host will request +fclk restore, when an external event is detected. Once the clock +is restored, the host detects the event normally. Since am33xx +doesn't have this line it never wakes from suspend. + +The workaround is to reconfigure the dat1 line as a GPIO upon +suspend. To make this work, we need to set 1) the named pinctrl +states "default", "active" and "idle", 2) the gpio detecting +sdio irq in suspend and 3) compatibe section, see example below. +The MMC driver will then toggle between active and idle during +the runtime. If configuration is incomplete, a warning message is +emitted "falling back to polling". Mind not every application +needs SDIO irq, e.g. MMC cards Affected chips are am335x, +probably others + + + mmc1: mmc@48060100 { + compatible = "ti,am33xx-hsmmc"; + ... + interrupts-extended = <&intc 64 &gpio2 28 0>; + ... + pinctrl-names = "default", "active", "idle" + pinctrl-0 = <&mmc1_pins>; + pinctrl-1 = <&mmc1_pins>; + pinctrl-2 = <&mmc1_cirq_pin>; + ... + }; + + mmc1_cirq_pin: pinmux_cirq_pin { + pinctrl-single,pins = < + 0x0f8 0x3f /* GPIO2_28 */ + >; + }; diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c index e945060..2c1f128 100644 --- a/drivers/mmc/host/omap_hsmmc.c +++ b/drivers/mmc/host/omap_hsmmc.c @@ -196,6 +196,8 @@ struct omap_hsmmc_host { #define HSMMC_SDIO_IRQ_ENABLED (1 << 0) /* SDIO irq enabled */ #define HSMMC_SWAKEUP_QUIRK (1 << 1) struct omap_hsmmc_next next_data; + struct pinctrl *pinctrl; + struct pinctrl_state *fixed, *active, *idle; struct omap_mmc_platform_data *pdata; }; @@ -452,6 +454,70 @@ static void omap_hsmmc_gpio_free(struct omap_mmc_platform_data *pdata) gpio_free(pdata->slots[0].switch_pin); } +static int omap_hsmmc_pin_init(struct omap_hsmmc_host *host) +{ + struct pinctrl *_pinctrl; + int ret; + + _pinctrl = devm_pinctrl_get(host->dev); + if (IS_ERR(_pinctrl)) { + /* okay, if the bootloader set it up right */ + dev_warn(host->dev, "no pinctrl handle\n"); + return 0; + } + + host->fixed = pinctrl_lookup_state(_pinctrl, + PINCTRL_STATE_DEFAULT); + if (IS_ERR(host->fixed)) { + dev_info(host->dev, + "pins are not configured from the driver\n"); + host->fixed = NULL; + devm_pinctrl_put(_pinctrl); + return 0; + } + + ret = pinctrl_select_state(_pinctrl, host->fixed); + if (ret < 0) { + dev_warn(host->dev, "fixed pinctrl state failed %d\n", ret); + goto err; + } + + /* For most cases we don't have wake-ups, and exit after this */ + host->active = pinctrl_lookup_state(_pinctrl, "active"); + if (IS_ERR(host->active)) { + ret = PTR_ERR(host->active); + host->active = NULL; + goto done; + } + + host->idle = pinctrl_lookup_state(_pinctrl, PINCTRL_STATE_IDLE); + if (IS_ERR(host->idle)) { + ret = PTR_ERR(host->idle); + host->idle = NULL; + goto err; + } + + /* Let's make sure the active and idle states work */ + ret = pinctrl_select_state(_pinctrl, host->idle); + if (ret < 0) + goto err; + + ret = pinctrl_select_state(_pinctrl, host->active); + if (ret < 0) + goto err; + + dev_info(mmc_dev(host->mmc), "pins configured for wake-up events\n"); + +done: + host->pinctrl = _pinctrl; + return 0; + +err: + dev_err(mmc_dev(host->mmc), "pins configuration error: %i\n", ret); + devm_pinctrl_put(_pinctrl); + return ret; +} + /* * Start clock to the card */ @@ -1675,8 +1741,14 @@ static int omap_hscmm_configure_wake_irq(struct omap_hsmmc_host *host) * Some omaps don't have wake-up path from deeper idle states * and need to remux SDIO DAT1 to GPIO for wake-up from idle. */ - if (host->pdata->controller_flags & OMAP_HSMMC_SWAKEUP_MISSING) + if (host->pdata->controller_flags & OMAP_HSMMC_SWAKEUP_MISSING) { + if (!host->idle) { + free_irq(host->wake_irq, host); + host->wake_irq = 0; + return -EINVAL; + } host->flags |= HSMMC_SWAKEUP_QUIRK; + } return 0; } @@ -1890,7 +1962,6 @@ static int omap_hsmmc_probe(struct platform_device *pdev) const struct of_device_id *match; dma_cap_mask_t mask; unsigned tx_req, rx_req; - struct pinctrl *pinctrl; match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev); if (match) { @@ -2107,10 +2178,9 @@ static int omap_hsmmc_probe(struct platform_device *pdev) omap_hsmmc_disable_irq(host); - pinctrl = devm_pinctrl_get_select_default(&pdev->dev); - if (IS_ERR(pinctrl)) - dev_warn(&pdev->dev, - "pins are not configured from the driver\n"); + ret = omap_hsmmc_pin_init(host); + if (ret) + goto err_pinctrl_state; /* * For now, only support SDIO interrupt if we have a separate @@ -2150,7 +2220,10 @@ err_slot_name: mmc_remove_host(mmc); if (host->wake_irq) free_irq(host->wake_irq, host); - if (mmc_slot(host).card_detect_irq) + if (host->pinctrl) + devm_pinctrl_put(host->pinctrl); +err_pinctrl_state: + if ((mmc_slot(host).card_detect_irq)) free_irq(mmc_slot(host).card_detect_irq, host); err_irq_cd: if (host->use_reg) @@ -2205,6 +2278,8 @@ static int omap_hsmmc_remove(struct platform_device *pdev) dma_release_channel(host->tx_chan); if (host->rx_chan) dma_release_channel(host->rx_chan); + if (host->pinctrl) + devm_pinctrl_put(host->pinctrl); pm_runtime_put_sync(host->dev); pm_runtime_disable(host->dev); @@ -2314,6 +2389,11 @@ static int omap_hsmmc_runtime_suspend(struct device *dev) OMAP_HSMMC_WRITE(host->base, ISE, 0); OMAP_HSMMC_WRITE(host->base, IE, 0); OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR); + if (host->idle) { + ret = pinctrl_select_state(host->pinctrl, host->idle); + if (ret < 0) + dev_warn(mmc_dev(host->mmc), "Unable to select idle pinmux\n"); + } hsmmc_enable_wake_irq(host); } @@ -2331,6 +2411,11 @@ static int omap_hsmmc_runtime_resume(struct device *dev) if (host->mmc->caps & MMC_CAP_SDIO_IRQ) { hsmmc_disable_wake_irq(host); + if (host->active) { + ret = pinctrl_select_state(host->pinctrl, host->active); + if (ret < 0) + dev_warn(mmc_dev(host->mmc), "Unable to select active pinmux\n"); + } OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR); OMAP_HSMMC_WRITE(host->base, ISE, CIRQ_EN); OMAP_HSMMC_WRITE(host->base, IE, CIRQ_EN);