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[209.132.180.67]) by mx.google.com with ESMTP id g1-v6si10114912pld.79.2018.08.01.02.28.01; Wed, 01 Aug 2018 02:28:15 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=a4CY9UiO; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388966AbeHALL7 (ORCPT + 99 others); Wed, 1 Aug 2018 07:11:59 -0400 Received: from mail-lj1-f196.google.com ([209.85.208.196]:39619 "EHLO mail-lj1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388746AbeHALL7 (ORCPT ); Wed, 1 Aug 2018 07:11:59 -0400 Received: by mail-lj1-f196.google.com with SMTP id l15-v6so16257180lji.6; Wed, 01 Aug 2018 02:27:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=uimI1Xv1IqpcZaPJgYJMmQZcB4UvF6/hfWWOmCTUss4=; b=a4CY9UiOvxgKqRhd6BkdA3a0Sj+LRdDsqOlot6X5r5SeeOGqKIljs07HJnFe4ew3Bl nOmveFYbckJLClIxwPFtrKha5BxXHzbPxCbsrw+cprx0EpVPXaeg3H2X42JbbWarkr2Y 8l3egP6nXRu4uX2rDYkxwqV6+AWtLCvv3POsUwFIC01EAW9+GnGjYvMn/kQvmgpsVcPK uIUYMQqnA5xnUmGi/hdcbj4eQujhcwkpaDQEi3V4gmot3RodAagX7TD4kEu4K8ZEWtuN wW3CCcPVkMrFflgsAVnH6d5fwMES3t7HITHuUkiqpVJ3SdRPWwQWpKozWL/oYmdGd6R3 HMLA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=uimI1Xv1IqpcZaPJgYJMmQZcB4UvF6/hfWWOmCTUss4=; b=UerSimbRoE0v15bF0CquC+Njxc9PCqrjM3P1lz/e7Y2mNZsQEgaHnTbYDkY3tAsxZH wuPP4N+FWu+vTH1ExsoQiH607eXqGFYY5RSuz/jCcEYOTK8HBkjEJPGSN2Vz6FciMOxd S1HvrD9txaFmb9LPeJ2cJT+m0KlYdoHsHG+SRwTa+nC+mGUwtqJrS0LmPfiwuMfZ0oHH n5oZbgl7yawP8zNuLYCrdaLuiPiaoD2T6+RJbvI+NwAhxbPJWBPJ5z+tGMmPV1oo9g7d iPEvoyQOFrM5KgFMRk4qaFI+h5p3ak7XBombBM2F+NBnGOmMAJ1cvxU1EZM66c2+6AdV 5ZzA== X-Gm-Message-State: AOUpUlEIyNe7WL/PB5JUuqgCov5oF3TFKcXNuBB4iktt/rMi02lUek7l 3VlZ8T/muuvD1SgPZc/7VvvOHcndoYc4ARv7LPU= X-Received: by 2002:a2e:9c0f:: with SMTP id s15-v6mr12706175lji.97.1533115625971; Wed, 01 Aug 2018 02:27:05 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:ab3:631a:0:0:0:0:0 with HTTP; Wed, 1 Aug 2018 02:26:25 -0700 (PDT) In-Reply-To: References: <1532340508-8749-1-git-send-email-zhang.chunyan@linaro.org> <1532340508-8749-6-git-send-email-zhang.chunyan@linaro.org> <33ceb61c-3e09-c336-e9b9-87c01336f56c@intel.com> <23282747-4ae1-d627-a537-590b9315b941@intel.com> From: Chunyan Zhang Date: Wed, 1 Aug 2018 17:26:25 +0800 Message-ID: Subject: Re: [PATCH V4 5/7] mmc: sdhci: add Auto CMD Auto Select support To: Adrian Hunter Cc: Chunyan Zhang , Ulf Hansson , linux-mmc@vger.kernel.org, Linux Kernel Mailing List , Orson Zhai , Baolin Wang , Billows Wu , Jason Wu Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 31 July 2018 at 17:36, Adrian Hunter wrote: > On 31/07/18 12:20, Chunyan Zhang wrote: >> On 31 July 2018 at 16:56, Adrian Hunter wrote: >>> On 31/07/18 11:36, Chunyan Zhang wrote: >>>> On 31 July 2018 at 16:05, Adrian Hunter wrote: >>>>> On 31/07/18 10:04, Chunyan Zhang wrote: >>>>>> Hi Adrian, >>>>>> >>>>>> On 30 July 2018 at 21:06, Adrian Hunter wrote: >>>>>>> On 23/07/18 13:08, Chunyan Zhang wrote: >>>>>>>> As SD Host Controller Specification v4.10 documents: >>>>>>>> Host Controller Version 4.10 defines this "Auto CMD Auto Select" mode. >>>>>>>> Selection of Auto CMD depends on setting of CMD23 Enable in the Host >>>>>>>> Control 2 register which indicates whether card supports CMD23. If CMD23 >>>>>>>> Enable =1, Auto CMD23 is used and if CMD23 Enable =0, Auto CMD12 is >>>>>>>> used. In case of Version 4.10 or later, use of Auto CMD Auto Select is >>>>>>>> recommended rather than use of Auto CMD12 Enable or Auto CMD23 >>>>>>>> Enable. >>>>>>>> >>>>>>>> This patch add this new mode support. >>>>>>>> >>>>>>>> Signed-off-by: Chunyan Zhang >>>>>>>> --- >>>>>>>> drivers/mmc/host/sdhci.c | 61 +++++++++++++++++++++++++++++++++++++++--------- >>>>>>>> drivers/mmc/host/sdhci.h | 2 ++ >>>>>>>> 2 files changed, 52 insertions(+), 11 deletions(-) >>>>>>>> >>>>>>>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c >>>>>>>> index 5acea3d..5c60590 100644 >>>>>>>> --- a/drivers/mmc/host/sdhci.c >>>>>>>> +++ b/drivers/mmc/host/sdhci.c >>>>>>>> @@ -311,6 +311,23 @@ static void sdhci_config_dma(struct sdhci_host *host) >>>>>>>> sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); >>>>>>>> } >>>>>>>> >>>>>>>> +static void sdhci_enable_cmd23(struct sdhci_host *host) >>>>>>>> +{ >>>>>>>> + u16 ctrl2; >>>>>>>> + >>>>>>>> + /* >>>>>>>> + * This is used along with "Auto CMD Auto Select" feature, >>>>>>>> + * which is introduced from v4.10, if card supports CMD23, >>>>>>>> + * Auto CMD23 should be used instead of Auto CMD12. >>>>>>>> + */ >>>>>>>> + if (host->version >= SDHCI_SPEC_410 && >>>>>>>> + (host->mmc->caps & MMC_CAP_CMD23)) { >>>>>>> >>>>>>> That is the host capability. It needs to be the card capability. >>>>>> >>>>>> Could you please elaborate the issue? >>>>>> >>>>>> I thought we're setting for host here. Do you mean we need to see the >>>>>> card capability? >>>>> >>>>> Yes. SDHCI_TRNS_AUTO_SEL selects auto-CMD23 or auto-CMD12 based on this >>>>> setting, so this must reflect the card's capability. >>>> >>>> Got it, but how to know if the card supports CMD23? >>> >>> At the moment the only way of knowing is if a request is received with mrq->sbc >>> >>>> >>>>> >>>>>> >>>>>>> >>>>>>>> + ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); >>>>>>>> + ctrl2 |= SDHCI_CMD23_ENABLE; >>>>>>>> + sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2); >>>>>>>> + } >>>>>>>> +} >>>>>>>> + >>>>>>>> static void sdhci_init(struct sdhci_host *host, int soft) >>>>>>>> { >>>>>>>> struct mmc_host *mmc = host->mmc; >>>>>>>> @@ -329,6 +346,8 @@ static void sdhci_init(struct sdhci_host *host, int soft) >>>>>>>> host->clock = 0; >>>>>>>> mmc->ops->set_ios(mmc, &mmc->ios); >>>>>>>> } >>>>>>>> + >>>>>>>> + sdhci_enable_cmd23(host); >>>>>>>> } >>>>>>>> >>>>>>>> static void sdhci_reinit(struct sdhci_host *host) >>>>>>>> @@ -1093,6 +1112,36 @@ static inline bool sdhci_auto_cmd12(struct sdhci_host *host, >>>>>>>> !mrq->cap_cmd_during_tfr; >>>>>>>> } >>>>>>>> >>>>>>>> +static inline void sdhci_auto_cmd_select(struct sdhci_host *host, >>>>>>>> + struct mmc_command *cmd, >>>>>>>> + u16 *mode) >>>>>>>> +{ >>>>>>>> + bool use_cmd12 = sdhci_auto_cmd12(host, cmd->mrq) && >>>>>>>> + (cmd->opcode != SD_IO_RW_EXTENDED); >>>>>>>> + bool use_cmd23 = cmd->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23); >>>>>>>> + >>>>>>>> + /* >>>>>>>> + * In case of Version 4.10 or later, use of 'Auto CMD Auto >>>>>>>> + * Select' is recommended rather than use of 'Auto CMD12 >>>>>>>> + * Enable' or 'Auto CMD23 Enable'. >>>>>>>> + */ >>>>>>>> + if (host->version >= SDHCI_SPEC_410 && (use_cmd12 || use_cmd23)) { >>>>>>>> + *mode |= SDHCI_TRNS_AUTO_SEL; >>>>>>> >>>>>>> As noted in patch 4, the CMD23 argument is not just the block count for eMMC. >>>>>> >>>>>> Probably I haven't got your point... >>>>>> >>>>>> >From what I understand, auto_sel mode doesn't need argument2. Doesn't >>>>>> this work for eMMC? >>>>> >>>>> CMD23 always needs an argument >>>> >>>> But setting argument for CMD23 will cover the block count value we set >>>> before, that will lead mounting emmc to fail. >>> >>> Does it fail because it contains cmd->mrq->sbc->arg or does it fail because >>> it gets written twice? >> >> Seems that the argument is too big compared with block count, hardware >> think it is a super block count. >> >> More details of the error information: >> https://www.irccloud.com/pastebin/uYlVEUsP/ > > Does it work with auto-CMD23 instead of auto-CMD-auto-select? No, so long as SDHCI_32BIT_BLK_CNT was set with cmd->mrq->sbc->arg which is a big value, it would report error "I/O error while writing superblock" when mounting emmc. > Does it work if the 16-bit block count register is used? 16-bit block count register is Read Only on my board :-( > > Obviously, if we can't pass the CMD23 argument correctly then we can't use > auto-CMD23. On my board, if argument2 was limited to the maximum of 65535, then everything works, otherwise I would see an error "EXT4-fs (mmcblk0p28): I/O error while writing superblock". Haven't found the root cause. I will continue to look at the problem, any comments would be appreciated. Thanks, Chunyan > >> >>> >>>> >>>>> >>>>>> >>>>>> The test platform I used was just eMMC only, haven't found problem. >>>>> >>>>> Because the bits that are missing from the CMD23 argument (reliable write, >>>>> context id, etc) will not make the command fail. >>>>> >>>>>> >>>>>> Thanks, >>>>>> Chunyan >>>>>> >>>>>>> >>>>>>>> + return; >>>>>>>> + } >>>>>>>> + >>>>>>>> + /* >>>>>>>> + * If we are sending CMD23, CMD12 never gets sent >>>>>>>> + * on successful completion (so no Auto-CMD12). >>>>>>>> + */ >>>>>>>> + if (use_cmd12) { >>>>>>>> + *mode |= SDHCI_TRNS_AUTO_CMD12; >>>>>>>> + } else if (use_cmd23) { >>>>>>>> + *mode |= SDHCI_TRNS_AUTO_CMD23; >>>>>>>> + sdhci_writel(host, cmd->mrq->sbc->arg, SDHCI_ARGUMENT2); >>>>>>>> + } >>>>>>>> +} >>>>>>>> + >>>>>>>> static void sdhci_set_transfer_mode(struct sdhci_host *host, >>>>>>>> struct mmc_command *cmd) >>>>>>>> { >>>>>>>> @@ -1119,17 +1168,7 @@ static void sdhci_set_transfer_mode(struct sdhci_host *host, >>>>>>>> >>>>>>>> if (mmc_op_multi(cmd->opcode) || data->blocks > 1) { >>>>>>>> mode = SDHCI_TRNS_BLK_CNT_EN | SDHCI_TRNS_MULTI; >>>>>>>> - /* >>>>>>>> - * If we are sending CMD23, CMD12 never gets sent >>>>>>>> - * on successful completion (so no Auto-CMD12). >>>>>>>> - */ >>>>>>>> - if (sdhci_auto_cmd12(host, cmd->mrq) && >>>>>>>> - (cmd->opcode != SD_IO_RW_EXTENDED)) >>>>>>>> - mode |= SDHCI_TRNS_AUTO_CMD12; >>>>>>>> - else if (cmd->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) { >>>>>>>> - mode |= SDHCI_TRNS_AUTO_CMD23; >>>>>>>> - sdhci_writel(host, cmd->mrq->sbc->arg, SDHCI_ARGUMENT2); >>>>>>>> - } >>>>>>>> + sdhci_auto_cmd_select(host, cmd, &mode); >>>>>>>> } >>>>>>>> >>>>>>>> if (data->flags & MMC_DATA_READ) >>>>>>>> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h >>>>>>>> index 81aae07..a8f4ec2 100644 >>>>>>>> --- a/drivers/mmc/host/sdhci.h >>>>>>>> +++ b/drivers/mmc/host/sdhci.h >>>>>>>> @@ -42,6 +42,7 @@ >>>>>>>> #define SDHCI_TRNS_BLK_CNT_EN 0x02 >>>>>>>> #define SDHCI_TRNS_AUTO_CMD12 0x04 >>>>>>>> #define SDHCI_TRNS_AUTO_CMD23 0x08 >>>>>>>> +#define SDHCI_TRNS_AUTO_SEL 0x0C >>>>>>>> #define SDHCI_TRNS_READ 0x10 >>>>>>>> #define SDHCI_TRNS_MULTI 0x20 >>>>>>>> >>>>>>>> @@ -185,6 +186,7 @@ >>>>>>>> #define SDHCI_CTRL_DRV_TYPE_D 0x0030 >>>>>>>> #define SDHCI_CTRL_EXEC_TUNING 0x0040 >>>>>>>> #define SDHCI_CTRL_TUNED_CLK 0x0080 >>>>>>>> +#define SDHCI_CMD23_ENABLE 0x0800 >>>>>>>> #define SDHCI_CTRL_V4_MODE 0x1000 >>>>>>>> #define SDHCI_CTRL_64BIT_ADDR 0x2000 >>>>>>>> #define SDHCI_CTRL_PRESET_VAL_ENABLE 0x8000 >>>>>>>> >>>>>>> >>>>>> >>>>> >>>> >>> >> >