From: Alim Akhtar <alim.akhtar@gmail.com>
To: Addy Ke <addy.ke@rock-chips.com>
Cc: robh+dt <robh+dt@kernel.org>,
pawel.moll@arm.com, "Mark Rutland" <mark.rutland@arm.com>,
ijc+devicetree@hellion.org.uk, galak@codeaurora.org,
rdunlap@infradead.org, "Seungwon Jeon" <tgih.jun@samsung.com>,
"Jaehoon Chung" <jh80.chung@samsung.com>,
"Chris Ball" <chris@printf.net>,
"Ulf Hansson" <ulf.hansson@linaro.org>,
dinguyen@altera.com, "Heiko Stübner" <heiko@sntech.de>,
"Olof Johansson" <olof@lixom.net>,
"Douglas Anderson" <dianders@chromium.org>,
"Sonny Rao" <sonnyrao@chromium.org>,
amstan@chromium.org, djkurtz@chromium.org,
huangtao@rock-chips.com,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
hl@rock-chips.com, linux-doc@vger.kernel.org, yzq@rock-chips.com,
zyw@rock-chips.com, zhangqing@rock-chips.com,
"linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
kever.yang@rock-chips.com, lintao@rock-chips.com,
linux-rockchip@lists.infradead.org, xjq@rock-chips.com,
zhenfu.fang@rock-chips.com, chenfen@rock-chips.com,
cf@rock-chips.com, hj@rock-chips.com,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
zyf@rock-chips.com
Subject: Re: [PATCH v2 1/2] mmc: dw_mmc: fix bug that cause 'Timeout sending command'
Date: Tue, 10 Feb 2015 20:52:47 +0530 [thread overview]
Message-ID: <CAGOxZ51wgw9iXF3xX39vnB0M5ZPb+zHWoCtTvvKdyo9bSOCVgw@mail.gmail.com> (raw)
In-Reply-To: <1423466726-20833-2-git-send-email-addy.ke@rock-chips.com>
Hi Addy,
On Mon, Feb 9, 2015 at 12:55 PM, Addy Ke <addy.ke@rock-chips.com> 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 <addy.ke@rock-chips.com>
> ---
> 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?
> + 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.
> + /* 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
> 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
--
Regards,
Alim
next prev parent reply other threads:[~2015-02-10 15:23 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-05 11:13 [PATCH] mmc: dw_mmc: fix bug that cause 'Timeout sending command' Addy Ke
2015-02-09 4:51 ` Ulf Hansson
2015-02-09 6:56 ` Addy
2015-02-09 7:04 ` Jaehoon Chung
2015-02-09 9:17 ` addy ke
2015-02-09 7:25 ` [PATCH v2 0/2] about data busy Addy Ke
2015-02-09 7:25 ` [PATCH v2 1/2] mmc: dw_mmc: fix bug that cause 'Timeout sending command' Addy Ke
2015-02-09 10:01 ` Jaehoon Chung
2015-02-11 3:07 ` Addy
2015-02-10 15:22 ` Alim Akhtar [this message]
2015-02-11 2:57 ` Addy
2015-02-11 11:58 ` Andrzej Hajda
2015-02-11 23:20 ` Alim Akhtar
2015-02-12 2:28 ` addy ke
2015-02-12 11:10 ` Andrzej Hajda
2015-02-12 13:59 ` Alim Akhtar
2015-02-13 8:15 ` addy ke
2015-02-12 11:13 ` Andrzej Hajda
2015-02-12 13:53 ` Alim Akhtar
2015-02-09 7:25 ` [PATCH v2 2/2] mmc: dw_mmc: Don't start command while data busy Addy Ke
2015-02-13 11:52 ` [PATCH v3 0/3] about " Addy Ke
2015-02-13 11:52 ` [PATCH v3 1/3] mmc: dw_mmc: update clock after host reach a stable voltage Addy Ke
2015-02-13 11:52 ` [PATCH v3 2/3] mmc: dw_mmc: fix bug that cause 'Timeout sending command' Addy Ke
2015-02-13 11:52 ` [PATCH v3 3/3] mmc: dw_mmc: Don't start command while data busy Addy Ke
2015-02-14 6:17 ` [PATCH v4 0/3] about " Addy Ke
2015-02-14 6:17 ` [PATCH v4 1/3] mmc: dw_mmc: update clock after host reach a stable voltage Addy Ke
2015-02-15 23:28 ` Alim Akhtar
2015-02-19 10:30 ` addy ke
2015-02-19 23:49 ` Doug Anderson
2015-02-20 0:02 ` Russell King - ARM Linux
2015-02-20 1:04 ` Doug Anderson
2015-02-20 19:05 ` Doug Anderson
2015-02-25 7:52 ` Alim Akhtar
2015-02-25 9:56 ` Jaehoon Chung
2015-02-25 21:05 ` Doug Anderson
2015-02-14 6:17 ` [PATCH v4 2/3] mmc: dw_mmc: fix bug that cause 'Timeout sending command' Addy Ke
2015-02-14 6:17 ` [PATCH v4 3/3] mmc: dw_mmc: Don't start command while data busy Addy Ke
2015-02-20 0:21 ` Doug Anderson
2015-02-15 11:41 ` [PATCH v4 0/3] about " Javier Martinez Canillas
2015-02-16 5:48 ` Jaehoon Chung
2015-02-16 11:09 ` Javier Martinez Canillas
2015-02-19 10:55 ` addy ke
2015-02-20 19:03 ` Doug Anderson
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAGOxZ51wgw9iXF3xX39vnB0M5ZPb+zHWoCtTvvKdyo9bSOCVgw@mail.gmail.com \
--to=alim.akhtar@gmail.com \
--cc=addy.ke@rock-chips.com \
--cc=amstan@chromium.org \
--cc=cf@rock-chips.com \
--cc=chenfen@rock-chips.com \
--cc=chris@printf.net \
--cc=devicetree@vger.kernel.org \
--cc=dianders@chromium.org \
--cc=dinguyen@altera.com \
--cc=djkurtz@chromium.org \
--cc=galak@codeaurora.org \
--cc=heiko@sntech.de \
--cc=hj@rock-chips.com \
--cc=hl@rock-chips.com \
--cc=huangtao@rock-chips.com \
--cc=ijc+devicetree@hellion.org.uk \
--cc=jh80.chung@samsung.com \
--cc=kever.yang@rock-chips.com \
--cc=lintao@rock-chips.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mmc@vger.kernel.org \
--cc=linux-rockchip@lists.infradead.org \
--cc=mark.rutland@arm.com \
--cc=olof@lixom.net \
--cc=pawel.moll@arm.com \
--cc=rdunlap@infradead.org \
--cc=robh+dt@kernel.org \
--cc=sonnyrao@chromium.org \
--cc=tgih.jun@samsung.com \
--cc=ulf.hansson@linaro.org \
--cc=xjq@rock-chips.com \
--cc=yzq@rock-chips.com \
--cc=zhangqing@rock-chips.com \
--cc=zhenfu.fang@rock-chips.com \
--cc=zyf@rock-chips.com \
--cc=zyw@rock-chips.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).