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[2620:137:e000::1:20]) by mx.google.com with ESMTP id n19-20020a170902d0d300b00163eff0e715si4708188pln.106.2022.06.02.01.25.35; Thu, 02 Jun 2022 01:25:48 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20210112 header.b=XLnMEhnW; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 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 S231940AbiFBH5O (ORCPT + 99 others); Thu, 2 Jun 2022 03:57:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39874 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230019AbiFBH5L (ORCPT ); Thu, 2 Jun 2022 03:57:11 -0400 Received: from mail-yb1-xb2f.google.com (mail-yb1-xb2f.google.com [IPv6:2607:f8b0:4864:20::b2f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DC0869A988; Thu, 2 Jun 2022 00:57:09 -0700 (PDT) Received: by mail-yb1-xb2f.google.com with SMTP id h75so6992732ybg.4; Thu, 02 Jun 2022 00:57:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=NxkE9eJbHaVE1GUrrgUR5z3Qleac2ZxUgnV8WSpjMWk=; b=XLnMEhnWzju085eSXdhH8CveKCcfBPjZOh1rpGAdGdyElJmQvfhZCgRB+aa6LJFkxZ Zwy7NjD3CuEXUL7UUNCtPm0fZ5QsTRkQhB3O8D708rBQVHfsuluWrJ2aUA30y6vg6eYK JwPW64qeFIQTrBcO0GWuRQ3SFHW/9OMbMF9lrvsIXaIWbeLjQVeU8sM/1uN0I7dfYkCx BwZZa85nsYc3GInG2UPK7KSEu8CVfy0n5JrKXsq3xbEzSovMRvuWQA6CvRa1+h/AItIf wdvdzgmGQGc3qJzP4Hb2kzyEtzi+uJpXrOCq836ur+fG/NgmBWYVe9Gf0nFyvYhcmEFw qfEg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=NxkE9eJbHaVE1GUrrgUR5z3Qleac2ZxUgnV8WSpjMWk=; b=ZZs7zzCWaqS6SzpKxCB0SEEdFPxzQX9JidyVu4sud0Aw2JbpvKDbwjAeYzKlfHBru/ iTk2GAs1oM7wzQ/k84yOp6nUUouOAsyzka6v9reo2EvtN/MIqDkw7iZwgTuGa2ELfi4W 1ElkmIut0IEu04fb7eBtOqQCkwJNh44aBMY4wDIoFzOlOEXHTAXVf1LB5RpVw34VX+mC fM96v9cIjtvRVNIjd3MfTqJdCCiMrYJsRNoo7funcUKPV2XEmwksTJg44lrWJEMpMsNN 8zbdr9X0lXkxIvYIXV+jY6zmF4rY1pEWJYa/fp3sRzBysGyU6652n0JgYJ3r6gyOgqiP E0VQ== X-Gm-Message-State: AOAM531g2cKPO7Hym4vuKt48s4zvjOW2Qo0Q7qTADKdpKz3EaQ769fyP pVJbg2FJU0+e8JJXsKzvBj7I88wIIIA+KbgiNFM= X-Received: by 2002:a25:1bc3:0:b0:65d:46e8:6322 with SMTP id b186-20020a251bc3000000b0065d46e86322mr3762959ybb.140.1654156629045; Thu, 02 Jun 2022 00:57:09 -0700 (PDT) MIME-Version: 1.0 References: <1650963852-4173-1-git-send-email-quic_spathi@quicinc.com> In-Reply-To: From: Ben Chuang Date: Thu, 2 Jun 2022 15:56:55 +0800 Message-ID: Subject: Re: [PATCH V1] mmc: core: Add partial initialization support To: "Kamasali Satyanarayan (Consultant) (QUIC)" Cc: Ulf Hansson , "Sarthak Garg (QUIC)" , "avri.altman@wdc.com" , "linus.walleij@linaro.org" , "shawn.lin@rock-chips.com" , "merez@codeaurora.org" , "s.shtylyov@omp.ru" , "huijin.park@samsung.com" , "briannorris@chromium.org" , "digetx@gmail.com" , "linux-mmc@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Veerabhadrarao Badiganti , Shaik Sajida Bhanu , "quic_spathi@quicinc.com" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Sarthak and others, I like your patch, I'm not familiar with the whole sleep/wake flow. But I have a question. Regarding mmc_poweroff_notify() , there is a parameter notify_type. In the spec., it has a value 0x04: SLEEP_NOTIFICATION (host is going to put the device in sleep mode.) Is there anything that needs to be changed in _mmc_suspend() before calling mmc_sleepawake(host, true)/mmc_power_off(host)? Thanks in advance. Best regards, Ben On Wed, May 25, 2022 at 12:31 AM Kamasali Satyanarayan (Consultant) (QUIC) wrote: > > Hi, > > These patches will be further taken by Sarthak. > > Thanks, > Satya > > -----Original Message----- > From: Ulf Hansson > Sent: Wednesday, April 27, 2022 1:06 PM > To: quic_spathi > Cc: avri.altman@wdc.com; linus.walleij@linaro.org; shawn.lin@rock-chips.c= om; merez@codeaurora.org; s.shtylyov@omp.ru; huijin.park@samsung.com; brian= norris@chromium.org; digetx@gmail.com; linux-mmc@vger.kernel.org; linux-ker= nel@vger.kernel.org; Veerabhadrarao Badiganti ; Sh= aik Sajida Bhanu ; Kamasali Satyanarayan (Consultant= ) (QUIC) > Subject: Re: [PATCH V1] mmc: core: Add partial initialization support > > On Tue, 26 Apr 2022 at 11:04, Srinivasarao Pathipati wrote: > > > > From: Maya Erez > > > > This change adds the ability to partially initialize the MMC card by > > using card Sleep/Awake sequence (CMD5). > > Card will be sent to Sleep state during runtime/system suspend and > > will be woken up during runtime/system resume. > > By using this sequence the card doesn't need full initialization which > > gives time reduction in system/runtime resume path. > > > > Signed-off-by: Maya Erez > > Signed-off-by: Veerabhadrarao Badiganti > > Signed-off-by: Shaik Sajida Bhanu > > Signed-off-by: kamasali > > Signed-off-by: Srinivasarao Pathipati > > It seems like this patch has been posted before [1]. Let me repeat my que= stion sent back then. > > It would be nice if you could provide some more exact numbers of what the= gain is for a couple of different eMMCs, to justify the change. > Can you please do that? > > Kind regards > Uffe > > [1] > https://patchwork.kernel.org/project/linux-mmc/patch/1591277381-7734-1-gi= t-send-email-vbadigan@codeaurora.org/ > > > --- > > drivers/mmc/core/mmc.c | 149 +++++++++++++++++++++++++++++++++++++++= +++++--- > > include/linux/mmc/card.h | 4 ++ > > include/linux/mmc/host.h | 2 + > > 3 files changed, 146 insertions(+), 9 deletions(-) > > > > diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index > > 9ab915b..8691c00 100644 > > --- a/drivers/mmc/core/mmc.c > > +++ b/drivers/mmc/core/mmc.c > > @@ -1942,7 +1942,14 @@ static int mmc_sleep_busy_cb(void *cb_data, bool= *busy) > > return 0; > > } > > > > -static int mmc_sleep(struct mmc_host *host) > > +static int mmc_can_sleepawake(struct mmc_host *host) { > > + return host && (host->caps2 & MMC_CAP2_SLEEP_AWAKE) && host->ca= rd && > > + (host->card->ext_csd.rev >=3D 3); > > + > > +} > > + > > +static int mmc_sleepawake(struct mmc_host *host, bool sleep) > > { > > struct mmc_command cmd =3D {}; > > struct mmc_card *card =3D host->card; @@ -1953,14 +1960,17 @@ > > static int mmc_sleep(struct mmc_host *host) > > /* Re-tuning can't be done once the card is deselected */ > > mmc_retune_hold(host); > > > > - err =3D mmc_deselect_cards(host); > > - if (err) > > - goto out_release; > > + if (sleep) { > > + err =3D mmc_deselect_cards(host); > > + if (err) > > + goto out_release; > > + } > > > > cmd.opcode =3D MMC_SLEEP_AWAKE; > > cmd.arg =3D card->rca << 16; > > - cmd.arg |=3D 1 << 15; > > use_r1b_resp =3D mmc_prepare_busy_cmd(host, &cmd, timeout_ms); > > + if (sleep) > > + cmd.arg |=3D 1 << 15; > > > > err =3D mmc_wait_for_cmd(host, &cmd, 0); > > if (err) > > @@ -1982,6 +1992,9 @@ static int mmc_sleep(struct mmc_host *host) > > > > err =3D __mmc_poll_for_busy(host, 0, timeout_ms, > > &mmc_sleep_busy_cb, host); > > > > + if (!sleep) > > + err =3D mmc_select_card(card); > > + > > out_release: > > mmc_retune_release(host); > > return err; > > @@ -2080,6 +2093,66 @@ static int _mmc_flush_cache(struct mmc_host *hos= t) > > pr_err("%s: cache flush error %d\n", > > mmc_hostname(host), err); > > } > > + return err; > > +} > > + > > +static int mmc_cache_card_ext_csd(struct mmc_host *host) { > > + int err; > > + u8 *ext_csd; > > + struct mmc_card *card =3D host->card; > > + > > + err =3D mmc_get_ext_csd(card, &ext_csd); > > + if (err || !ext_csd) { > > + pr_err("%s: %s: mmc_get_ext_csd failed (%d)\n", > > + mmc_hostname(host), __func__, err); > > + return err; > > + } > > + /* only cache read/write fields that the sw changes */ > > + card->ext_csd.raw_ext_csd_cmdq =3D ext_csd[EXT_CSD_CMDQ_MODE_EN= ]; > > + card->ext_csd.raw_ext_csd_cache_ctrl =3D ext_csd[EXT_CSD_CACHE_= CTRL]; > > + card->ext_csd.raw_ext_csd_bus_width =3D ext_csd[EXT_CSD_BUS_WID= TH]; > > + card->ext_csd.raw_ext_csd_hs_timing =3D > > + ext_csd[EXT_CSD_HS_TIMING]; > > + > > + kfree(ext_csd); > > + > > + return 0; > > +} > > + > > +static int mmc_test_awake_ext_csd(struct mmc_host *host) { > > + int err; > > + u8 *ext_csd; > > + struct mmc_card *card =3D host->card; > > + > > + err =3D mmc_get_ext_csd(card, &ext_csd); > > + if (err) { > > + pr_err("%s: %s: mmc_get_ext_csd failed (%d)\n", > > + mmc_hostname(host), __func__, err); > > + return err; > > + } > > + > > + /* only compare read/write fields that the sw changes */ > > + pr_debug("%s: %s: type(cached:current) cmdq(%d:%d) cache_ctrl(%= d:%d) bus_width (%d:%d) timing(%d:%d)\n", > > + mmc_hostname(host), __func__, > > + card->ext_csd.raw_ext_csd_cmdq, > > + ext_csd[EXT_CSD_CMDQ_MODE_EN], > > + card->ext_csd.raw_ext_csd_cache_ctrl, > > + ext_csd[EXT_CSD_CACHE_CTRL], > > + card->ext_csd.raw_ext_csd_bus_width, > > + ext_csd[EXT_CSD_BUS_WIDTH], > > + card->ext_csd.raw_ext_csd_hs_timing, > > + ext_csd[EXT_CSD_HS_TIMING]); > > + err =3D !((card->ext_csd.raw_ext_csd_cmdq =3D=3D > > + ext_csd[EXT_CSD_CMDQ_MODE_EN]) && > > + (card->ext_csd.raw_ext_csd_cache_ctrl =3D=3D > > + ext_csd[EXT_CSD_CACHE_CTRL]) && > > + (card->ext_csd.raw_ext_csd_bus_width =3D=3D > > + ext_csd[EXT_CSD_BUS_WIDTH]) && > > + (card->ext_csd.raw_ext_csd_hs_timing =3D=3D > > + ext_csd[EXT_CSD_HS_TIMING])); > > + > > + kfree(ext_csd); > > > > return err; > > } > > @@ -2103,8 +2176,12 @@ static int _mmc_suspend(struct mmc_host *host, b= ool is_suspend) > > ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend || > > (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE_IN_SUSPEND))) > > err =3D mmc_poweroff_notify(host->card, notify_type); > > - else if (mmc_can_sleep(host->card)) > > - err =3D mmc_sleep(host); > > + if (mmc_can_sleepawake(host)) { > > + memcpy(&host->cached_ios, &host->ios, sizeof(host->cach= ed_ios)); > > + mmc_cache_card_ext_csd(host); > > + } > > + if (mmc_can_sleep(host->card)) > > + err =3D mmc_sleepawake(host, true); > > else if (!mmc_host_is_spi(host)) > > err =3D mmc_deselect_cards(host); > > > > @@ -2117,6 +2194,48 @@ static int _mmc_suspend(struct mmc_host *host, b= ool is_suspend) > > return err; > > } > > > > +static int mmc_partial_init(struct mmc_host *host) { > > + int err =3D 0; > > + struct mmc_card *card =3D host->card; > > + > > + mmc_set_bus_width(host, host->cached_ios.bus_width); > > + mmc_set_timing(host, host->cached_ios.timing); > > + if (host->cached_ios.enhanced_strobe) { > > + host->ios.enhanced_strobe =3D true; > > + if (host->ops->hs400_enhanced_strobe) > > + host->ops->hs400_enhanced_strobe(host, &host->i= os); > > + } > > + mmc_set_clock(host, host->cached_ios.clock); > > + mmc_set_bus_mode(host, host->cached_ios.bus_mode); > > + > > + if (!mmc_card_hs400es(card) && > > + (mmc_card_hs200(card) || mmc_card_hs400(card)))= { > > + err =3D mmc_execute_tuning(card); > > + if (err) { > > + pr_err("%s: %s: Tuning failed (%d)\n", > > + mmc_hostname(host), __func__, err); > > + goto out; > > + } > > + } > > + /* > > + * The ext_csd is read to make sure the card did not went throu= gh > > + * Power-failure during sleep period. > > + * A subset of the W/E_P, W/C_P register will be tested. In cas= e > > + * these registers values are different from the values that we= re > > + * cached during suspend, we will conclude that a Power-failure= occurred > > + * and will do full initialization sequence. > > + */ > > + err =3D mmc_test_awake_ext_csd(host); > > + if (err) { > > + pr_debug("%s: %s: fail on ext_csd read (%d)\n", > > + mmc_hostname(host), __func__, err); > > + goto out; > > + } > > +out: > > + return err; > > +} > > + > > /* > > * Suspend callback > > */ > > @@ -2139,7 +2258,7 @@ static int mmc_suspend(struct mmc_host *host) > > */ > > static int _mmc_resume(struct mmc_host *host) { > > - int err =3D 0; > > + int err =3D -EINVAL; > > > > mmc_claim_host(host); > > > > @@ -2147,7 +2266,19 @@ static int _mmc_resume(struct mmc_host *host) > > goto out; > > > > mmc_power_up(host, host->card->ocr); > > - err =3D mmc_init_card(host, host->card->ocr, host->card); > > + > > + if (mmc_can_sleepawake(host)) { > > + err =3D mmc_sleepawake(host, false); > > + if (!err) > > + err =3D mmc_partial_init(host); > > + else > > + pr_err("%s: %s: awake failed (%d), fallback to = full init\n", > > + mmc_hostname(host), __func__, err); > > + } > > + > > + if (err) > > + err =3D mmc_init_card(host, host->card->ocr, host->card= ); > > + > > mmc_card_clr_suspended(host->card); > > > > out: > > diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h > > index 37f9758..ed7f6f7 100644 > > --- a/include/linux/mmc/card.h > > +++ b/include/linux/mmc/card.h > > @@ -86,6 +86,8 @@ struct mmc_ext_csd { > > unsigned int data_tag_unit_size; /* DATA TAG UNI= T size */ > > unsigned int boot_ro_lock; /* ro lock supp= ort */ > > bool boot_ro_lockable; > > + u8 raw_ext_csd_cmdq; /* 15 */ > > + u8 raw_ext_csd_cache_ctrl; /* 33 */ > > bool ffu_capable; /* Firmware upgrade sup= port */ > > bool cmdq_en; /* Command Queue enable= d */ > > bool cmdq_support; /* Command Queue suppor= ted */ > > @@ -96,7 +98,9 @@ struct mmc_ext_csd { > > u8 raw_partition_support; /* 160 */ > > u8 raw_rpmb_size_mult; /* 168 */ > > u8 raw_erased_mem_count; /* 181 */ > > + u8 raw_ext_csd_bus_width; /* 183 */ > > u8 strobe_support; /* 184 */ > > + u8 raw_ext_csd_hs_timing; /* 185 */ > > u8 raw_ext_csd_structure; /* 194 */ > > u8 raw_card_type; /* 196 */ > > u8 raw_driver_strength; /* 197 */ > > diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h > > index c38072e..a9ddf7a 100644 > > --- a/include/linux/mmc/host.h > > +++ b/include/linux/mmc/host.h > > @@ -422,6 +422,7 @@ struct mmc_host { > > #else > > #define MMC_CAP2_CRYPTO 0 > > #endif > > +#define MMC_CAP2_SLEEP_AWAKE (1 << 29) /* Use Sleep/Awake (CMD= 5) */ > > #define MMC_CAP2_ALT_GPT_TEGRA (1 << 28) /* Host with eMMC that = has GPT entry at a non-standard location */ > > > > int fixed_drv_type; /* fixed driver type fo= r non-removable media */ > > @@ -441,6 +442,7 @@ struct mmc_host { > > spinlock_t lock; /* lock for claim and b= us ops */ > > > > struct mmc_ios ios; /* current io bus setti= ngs */ > > + struct mmc_ios cached_ios; > > > > /* group bitfields together to minimize padding */ > > unsigned int use_spi_crc:1; > > -- > > 2.7.4 > >