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Date: Tue, 26 Sep 2023 12:01:59 +0530
From: Sarthak Garg <quic_sartgarg@...cinc.com>
To: Ben Chuang <benchuanggli@...il.com>,
"Kamasali Satyanarayan (Consultant) (QUIC)"
<quic_kamasali@...cinc.com>
CC: Ulf Hansson <ulf.hansson@...aro.org>,
"avri.altman@....com" <avri.altman@....com>,
"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
"shawn.lin@...k-chips.com" <shawn.lin@...k-chips.com>,
"merez@...eaurora.org" <merez@...eaurora.org>,
"s.shtylyov@....ru" <s.shtylyov@....ru>,
"huijin.park@...sung.com" <huijin.park@...sung.com>,
"briannorris@...omium.org" <briannorris@...omium.org>,
"digetx@...il.com" <digetx@...il.com>,
"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"Veerabhadrarao Badiganti" <vbadigan@...eaurora.org>,
Shaik Sajida Bhanu <sbhanu@...eaurora.org>,
"quic_spathi@...cinc.com" <quic_spathi@...cinc.com>
Subject: Re: [PATCH V1] mmc: core: Add partial initialization support
On 6/2/2022 1:26 PM, Ben Chuang wrote:
> 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
Hi Ben,
I went through the sleep notification in the eMMC spec. This sleep
notification seems optional as per this statement in spec: "It *may* use
to a power notification (SLEEP_NOTIFICATION) if it intends to turn-off
VCC after moving the device to sleep state". So it doesn't seem to be a
good club this with my change. We can revisit and take this separately.
Thanks,
Sarthak
>
> On Wed, May 25, 2022 at 12:31 AM Kamasali Satyanarayan (Consultant)
> (QUIC) <quic_kamasali@...cinc.com> wrote:
>> Hi,
>>
>> These patches will be further taken by Sarthak.
>>
>> Thanks,
>> Satya
>>
>> -----Original Message-----
>> From: Ulf Hansson <ulf.hansson@...aro.org>
>> Sent: Wednesday, April 27, 2022 1:06 PM
>> To: quic_spathi <quic_spathi@...cinc.com>
>> Cc: avri.altman@....com; linus.walleij@...aro.org; shawn.lin@...k-chips.com; merez@...eaurora.org; s.shtylyov@....ru; huijin.park@...sung.com; briannorris@...omium.org; digetx@...il.com; linux-mmc@...r.kernel.org; linux-kernel@...r.kernel.org; Veerabhadrarao Badiganti <vbadigan@...eaurora.org>; Shaik Sajida Bhanu <sbhanu@...eaurora.org>; Kamasali Satyanarayan (Consultant) (QUIC) <quic_kamasali@...cinc.com>
>> Subject: Re: [PATCH V1] mmc: core: Add partial initialization support
>>
>> On Tue, 26 Apr 2022 at 11:04, Srinivasarao Pathipati <quic_spathi@...cinc.com> wrote:
>>> From: Maya Erez <merez@...eaurora.org>
>>>
>>> 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 <merez@...eaurora.org>
>>> Signed-off-by: Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
>>> Signed-off-by: Shaik Sajida Bhanu <sbhanu@...eaurora.org>
>>> Signed-off-by: kamasali <quic_kamasali@...cinc.com>
>>> Signed-off-by: Srinivasarao Pathipati <quic_spathi@...cinc.com>
>> It seems like this patch has been posted before [1]. Let me repeat my question 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-git-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->card &&
>>> + (host->card->ext_csd.rev >= 3);
>>> +
>>> +}
>>> +
>>> +static int mmc_sleepawake(struct mmc_host *host, bool sleep)
>>> {
>>> struct mmc_command cmd = {};
>>> struct mmc_card *card = 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 = mmc_deselect_cards(host);
>>> - if (err)
>>> - goto out_release;
>>> + if (sleep) {
>>> + err = mmc_deselect_cards(host);
>>> + if (err)
>>> + goto out_release;
>>> + }
>>>
>>> cmd.opcode = MMC_SLEEP_AWAKE;
>>> cmd.arg = card->rca << 16;
>>> - cmd.arg |= 1 << 15;
>>> use_r1b_resp = mmc_prepare_busy_cmd(host, &cmd, timeout_ms);
>>> + if (sleep)
>>> + cmd.arg |= 1 << 15;
>>>
>>> err = mmc_wait_for_cmd(host, &cmd, 0);
>>> if (err)
>>> @@ -1982,6 +1992,9 @@ static int mmc_sleep(struct mmc_host *host)
>>>
>>> err = __mmc_poll_for_busy(host, 0, timeout_ms,
>>> &mmc_sleep_busy_cb, host);
>>>
>>> + if (!sleep)
>>> + err = mmc_select_card(card);
>>> +
>>> out_release:
>>> mmc_retune_release(host);
>>> return err;
>>> @@ -2080,6 +2093,66 @@ static int _mmc_flush_cache(struct mmc_host *host)
>>> 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 = host->card;
>>> +
>>> + err = 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 = 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];
>>> +
>>> + 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 = host->card;
>>> +
>>> + err = 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 = !((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]));
>>> +
>>> + kfree(ext_csd);
>>>
>>> return err;
>>> }
>>> @@ -2103,8 +2176,12 @@ static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
>>> ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend ||
>>> (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE_IN_SUSPEND)))
>>> err = mmc_poweroff_notify(host->card, notify_type);
>>> - else if (mmc_can_sleep(host->card))
>>> - err = mmc_sleep(host);
>>> + if (mmc_can_sleepawake(host)) {
>>> + memcpy(&host->cached_ios, &host->ios, sizeof(host->cached_ios));
>>> + mmc_cache_card_ext_csd(host);
>>> + }
>>> + if (mmc_can_sleep(host->card))
>>> + err = mmc_sleepawake(host, true);
>>> else if (!mmc_host_is_spi(host))
>>> err = mmc_deselect_cards(host);
>>>
>>> @@ -2117,6 +2194,48 @@ static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
>>> return err;
>>> }
>>>
>>> +static int mmc_partial_init(struct mmc_host *host) {
>>> + int err = 0;
>>> + struct mmc_card *card = 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 = true;
>>> + if (host->ops->hs400_enhanced_strobe)
>>> + host->ops->hs400_enhanced_strobe(host, &host->ios);
>>> + }
>>> + 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 = 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 through
>>> + * Power-failure during sleep period.
>>> + * A subset of the W/E_P, W/C_P register will be tested. In case
>>> + * these registers values are different from the values that were
>>> + * cached during suspend, we will conclude that a Power-failure occurred
>>> + * and will do full initialization sequence.
>>> + */
>>> + err = 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 = 0;
>>> + int err = -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 = mmc_init_card(host, host->card->ocr, host->card);
>>> +
>>> + if (mmc_can_sleepawake(host)) {
>>> + err = mmc_sleepawake(host, false);
>>> + if (!err)
>>> + err = 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 = 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 UNIT size */
>>> unsigned int boot_ro_lock; /* ro lock support */
>>> bool boot_ro_lockable;
>>> + u8 raw_ext_csd_cmdq; /* 15 */
>>> + u8 raw_ext_csd_cache_ctrl; /* 33 */
>>> bool ffu_capable; /* Firmware upgrade support */
>>> bool cmdq_en; /* Command Queue enabled */
>>> bool cmdq_support; /* Command Queue supported */
>>> @@ -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 (CMD5) */
>>> #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 for non-removable media */
>>> @@ -441,6 +442,7 @@ struct mmc_host {
>>> spinlock_t lock; /* lock for claim and bus ops */
>>>
>>> struct mmc_ios ios; /* current io bus settings */
>>> + struct mmc_ios cached_ios;
>>>
>>> /* group bitfields together to minimize padding */
>>> unsigned int use_spi_crc:1;
>>> --
>>> 2.7.4
>>>
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