From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755750AbbBLNyW (ORCPT ); Thu, 12 Feb 2015 08:54:22 -0500 Received: from mail-qc0-f182.google.com ([209.85.216.182]:49136 "EHLO mail-qc0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754758AbbBLNyT (ORCPT ); Thu, 12 Feb 2015 08:54:19 -0500 MIME-Version: 1.0 In-Reply-To: <54DC8AF1.8030101@samsung.com> References: <1423134801-23219-1-git-send-email-addy.ke@rock-chips.com> <1423466726-20833-1-git-send-email-addy.ke@rock-chips.com> <1423466726-20833-2-git-send-email-addy.ke@rock-chips.com> <54DAC534.4020708@rock-chips.com> <54DB43E2.70203@samsung.com> <54DC8AF1.8030101@samsung.com> From: Alim Akhtar Date: Thu, 12 Feb 2015 19:23:37 +0530 Message-ID: Subject: Re: [PATCH v2 1/2] mmc: dw_mmc: fix bug that cause 'Timeout sending command' To: Andrzej Hajda Cc: Addy , "robh+dt" , pawel.moll@arm.com, Mark Rutland , ijc+devicetree@hellion.org.uk, Kumar Gala , rdunlap@infradead.org, Seungwon Jeon , Jaehoon Chung , Chris Ball , Ulf Hansson , dinguyen@altera.com, =?UTF-8?Q?Heiko_St=C3=BCbner?= , Olof Johansson , Douglas Anderson , Sonny Rao , Alexandru Stan , Daniel Kurtz , Tao Huang , "devicetree@vger.kernel.org" , Lin Huang , linux-doc@vger.kernel.org, =?UTF-8?B?5aea5pm65oOF?= , Chris Zhong , zhangqing@rock-chips.com, "linux-mmc@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Kever Yang Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Andrzej, On Thu, Feb 12, 2015 at 4:43 PM, Andrzej Hajda wrote: > On 02/12/2015 12:20 AM, Alim Akhtar wrote: >> Hi Andrzej, >> >> On Wed, Feb 11, 2015 at 5:28 PM, Andrzej Hajda wrote: >>> Hi Alim, >>> >>> On 02/11/2015 03:57 AM, Addy wrote: >>>> On 2015/02/10 23:22, Alim Akhtar wrote: >>>>> Hi Addy, >>>>> >>>>> On Mon, Feb 9, 2015 at 12:55 PM, Addy Ke wrote: >>>>>> Because of some uncertain factors, such as worse card or worse hardware, >>>>>> DAT[3:0](the data lines) may be pulled down by card, and mmc controller >>>>>> will be in busy state. This should not happend when mmc controller >>>>>> send command to update card clocks. If this happends, mci_send_cmd will >>>>>> be failed and we will get 'Timeout sending command', and then system will >>>>>> be blocked. To avoid this, we need reset mmc controller. >>>>>> >>>>>> Signed-off-by: Addy Ke >>>>>> --- >>>>>> drivers/mmc/host/dw_mmc.c | 28 ++++++++++++++++++++++++++++ >>>>>> 1 file changed, 28 insertions(+) >>>>>> >>>>>> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c >>>>>> index 4d2e3c2..b0b57e3 100644 >>>>>> --- a/drivers/mmc/host/dw_mmc.c >>>>>> +++ b/drivers/mmc/host/dw_mmc.c >>>>>> @@ -100,6 +100,7 @@ struct idmac_desc { >>>>>> }; >>>>>> #endif /* CONFIG_MMC_DW_IDMAC */ >>>>>> >>>>>> +static int dw_mci_card_busy(struct mmc_host *mmc); >>>>>> static bool dw_mci_reset(struct dw_mci *host); >>>>>> static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset); >>>>>> >>>>>> @@ -888,6 +889,31 @@ static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg) >>>>>> cmd, arg, cmd_status); >>>>>> } >>>>>> >>>>>> +static void dw_mci_wait_busy(struct dw_mci_slot *slot) >>>>>> +{ >>>>>> + struct dw_mci *host = slot->host; >>>>>> + unsigned long timeout = jiffies + msecs_to_jiffies(500); >>>>>> + >>>>> Why 500 msec? >>>> This timeout value is the same as mci_send_cmd: >>>> static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg) >>>> { >>>> struct dw_mci *host = slot->host; >>>> unsigned long timeout = jiffies + msecs_to_jiffies(500); >>>> .... >>>> } >>>> >>>> I have not clear that which is suitable. >>>> Do you have any suggestion on it? >>>>>> + do { >>>>>> + if (!dw_mci_card_busy(slot->mmc)) >>>>>> + return; >>>>>> + cpu_relax(); >>>>>> + } while (time_before(jiffies, timeout)); >>>>>> + >>>>>> + dev_err(host->dev, "Data busy (status %#x)\n", >>>>>> + mci_readl(slot->host, STATUS)); >>>>>> + >>>>>> + /* >>>>>> + * Data busy, this should not happend when mmc controller send command >>>>>> + * to update card clocks in non-volt-switch state. If it happends, we >>>>>> + * should reset controller to avoid getting "Timeout sending command". >>>>>> + */ >>>>>> + dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS); >>>>>> + >>>>> Why you need to reset all blocks? may be CTRL_RESET is good enough here. >>>> I have tested on rk3288, if only reset ctroller, data busy bit will not >>>> be cleaned,and we will still get >>>> >>>> "Timeout sending command". >>>> >>>>>> + /* Fail to reset controller or still data busy, WARN_ON! */ >>>>>> + WARN_ON(dw_mci_card_busy(slot->mmc)); >>>>>> +} >>>>>> + >>>>>> static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit) >>>>>> { >>>>>> struct dw_mci *host = slot->host; >>>>>> @@ -899,6 +925,8 @@ static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit) >>>>>> /* We must continue to set bit 28 in CMD until the change is complete */ >>>>>> if (host->state == STATE_WAITING_CMD11_DONE) >>>>>> sdmmc_cmd_bits |= SDMMC_CMD_VOLT_SWITCH; >>>>>> + else >>>>>> + dw_mci_wait_busy(slot); >>>>>> >>>>> hmm...I would suggest you to call dw_mci_wait_busy() from inside >>>>> mci_send_cmd(), seems like dw_mmc hangs while sending update clock cmd >>>>> in multiple cases.see [1] >>>>> >>>>> [1]: http://permalink.gmane.org/gmane.linux.kernel.mmc/31140 >>>> I think this patch is more reasonable. >>>> So I will resend patches based on this patch. >>>> thank you! >>> I have tested your patches instead [1] above and they do not solve my issue: >>> Board: odroid-xu3/exynos5422/dw_mmc_250a. >>> MMC card: absent, broken-cd quirk >>> SD card: present >>> >> I doubt $SUBJECT patch in current form can resolve you issue. I have >> already given comments on $subject patch. >> >> Can you try out below patch (I have not tested yet) on top of $SUBJECT patch? >> >> ======= >> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c >> index b0b57e3..ea87844 100644 >> --- a/drivers/mmc/host/dw_mmc.c >> +++ b/drivers/mmc/host/dw_mmc.c >> @@ -101,6 +101,7 @@ struct idmac_desc { >> #endif /* CONFIG_MMC_DW_IDMAC */ >> >> static int dw_mci_card_busy(struct mmc_host *mmc); >> +static void dw_mci_wait_busy(struct dw_mci_slot *slot); >> static bool dw_mci_reset(struct dw_mci *host); >> static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset); >> >> @@ -874,16 +875,22 @@ static void mci_send_cmd(struct dw_mci_slot >> *slot, u32 cmd, u32 arg) >> struct dw_mci *host = slot->host; >> unsigned long timeout = jiffies + msecs_to_jiffies(500); >> unsigned int cmd_status = 0; >> + int re_try = 3; /* just random for now, 1 re-try should be ok */ >> >> - mci_writel(host, CMDARG, arg); >> - wmb(); >> - mci_writel(host, CMD, SDMMC_CMD_START | cmd); >> + while(re_try--) { >> + mci_writel(host, CMDARG, arg); >> + wmb(); >> + mci_writel(host, CMD, SDMMC_CMD_START | cmd); >> >> - while (time_before(jiffies, timeout)) { >> - cmd_status = mci_readl(host, CMD); >> - if (!(cmd_status & SDMMC_CMD_START)) >> - return; >> + while (time_before(jiffies, timeout)) { >> + cmd_status = mci_readl(host, CMD); >> + if (!(cmd_status & SDMMC_CMD_START)) >> + return; >> + } >> + >> + dw_mci_wait_busy(slot); >> } >> + >> dev_err(&slot->mmc->class_dev, >> "Timeout sending command (cmd %#x arg %#x status %#x)\n", >> cmd, arg, cmd_status); >> @@ -925,8 +932,6 @@ static void dw_mci_setup_bus(struct dw_mci_slot >> *slot, bool force_clkinit) >> /* We must continue to set bit 28 in CMD until the change is complete */ >> if (host->state == STATE_WAITING_CMD11_DONE) >> sdmmc_cmd_bits |= SDMMC_CMD_VOLT_SWITCH; >> - else >> - dw_mci_wait_busy(slot); >> >> if (!clock) { >> mci_writel(host, CLKENA, 0); > > It does not help, there is still the same timeout. > Did you tried this on top of the original $subject patch? What does STATUS register tells? Can you post the full log here? > Regards > Andrzej > >> >> ===== end ====== >>> System hangs during boot after few minutes kernel spits: >>> [ 242.188098] INFO: task kworker/u16:1:50 blocked for more than 120 >>> seconds. >>> [ 242.193524] Not tainted >>> 3.19.0-next-20150210-00002-gf96831b-dirty #3834 >>> [ 242.200622] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" >>> disables this message. >>> [ 242.208422] kworker/u16:1 D c04766ac 0 50 2 0x00000000 >>> [ 242.214756] Workqueue: kmmcd mmc_rescan >>> [ 242.218553] [] (__schedule) from [] >>> (schedule+0x34/0x98) >>> [ 242.225591] [] (schedule) from [] >>> (schedule_timeout+0x110/0x164) >>> [ 242.233302] [] (schedule_timeout) from [] >>> (wait_for_common+0xb8/0x14c) >>> [ 242.241539] [] (wait_for_common) from [] >>> (mmc_wait_for_req+0x68/0x17c) >>> [ 242.249861] [] (mmc_wait_for_req) from [] >>> (mmc_wait_for_cmd+0x80/0xa0) >>> [ 242.258002] [] (mmc_wait_for_cmd) from [] >>> (mmc_go_idle+0x78/0xf8) >>> [ 242.265796] [] (mmc_go_idle) from [] >>> (mmc_rescan+0x280/0x314) >>> [ 242.273253] [] (mmc_rescan) from [] >>> (process_one_work+0x120/0x324) >>> [ 242.281135] [] (process_one_work) from [] >>> (worker_thread+0x30/0x42c) >>> [ 242.289194] [] (worker_thread) from [] >>> (kthread+0xd8/0xf4) >>> [ 242.296389] [] (kthread) from [] >>> (ret_from_fork+0x14/0x34) >>> >>> Just for record, Exynos4412/dw_mmc_240a with the same configuration >>> (no MMC card, broken-cd) works OK without patches. >>> >>> >>> Regards >>> Andrzej >>> >>>>>> if (!clock) { >>>>>> mci_writel(host, CLKENA, 0); >>>>>> -- >>>>>> 1.8.3.2 >>>>>> >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> linux-arm-kernel mailing list >>>>>> linux-arm-kernel@lists.infradead.org >>>>>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel >>>>> >>>> >>>> -- >>>> To unsubscribe from this list: send the line "unsubscribe linux-doc" in >>>> the body of a message to majordomo@vger.kernel.org >>>> More majordomo info at http://vger.kernel.org/majordomo-info.html >>>> >> >> > -- Regards, Alim