Jaehoon Chung <jh80.chung <at> samsung.com> writes:
>
> On 02/28/2012 02:32 PM, Dongjin Kim wrote:
>
> > Hello,
> >
> > I encountered the problem that my hardware is frozen while switching clock
from
> > 400kHz to others. This is caused that hardware locked error was triggered
when
> > CMD register was written and interrupt was pended. Tested IP version is
2.10a
> >
>
> Hi Dongjin.
>
> It seems like this problem. Can you check this patch?
> http://www.spinics.net/lists/linux-mmc/msg09895.html
>
> Best Regards,
> Jaehoon Chung
>
Hi Jaehoon,
Thank you for your feedback.
I had tested the patch from the link but the result is same on my hardware.
This is the log message what I had before, the hardware hanged after this log
when mmc card is inserted.
[ 62.450000] end_request: I/O error, dev mmcblk0, sector 7585
[ 62.460000] mmcblk0: error -123 sending read/write command, response 0x0,
card status 0x0
[ 62.470000] end_request: I/O error, dev mmcblk0, sector 7586
[ 62.470000] mmcblk0: error -123 sending read/write command, response 0x0,
card status 0x0
[ 62.480000] end_request: I/O error, dev mmcblk0, sector 7587
[ 62.490000] mmcblk0: error -123 sending read/write command, response 0x0,
card status 0x0
[ 62.490000] end_request: I/O error, dev mmcblk0, sector 7588
[ 62.500000] mmcblk0: error -123 sending read/write command, response 0x0,
card status 0x0
[ 62.510000] end_request: I/O error, dev mmcblk0, sector 7589
[ 62.510000] Buffer I/O error on device mmcblk0p1, logical block 940
[ 63.770000] mmc_host mmc1: Bus speed (slot 0) = 50000000Hz (slot req
400000Hz, actual 403225HZ div = 62)
[ 64.270000] mmc_host mmc1: Timeout sending command (cmd 0x202000 arg 0x0
status 0x80202000)
In normal case, the log message have to go through as below and usually it is,
except on certain case.
[ 80.620000] mmcblk0: error -123 sending read/write command, response 0x0,
card status 0x0
[ 80.620000] mmcblk0: error -123 requesting status
[ 80.620000] end_request: I/O error, dev mmcblk0, sector 7614
[ 82.930000] mmc_host mmc1: Bus speed (slot 0) = 50000000Hz (slot req
400000Hz, actual 403225HZ div = 62)
[ 83.730000] mmc_host mmc1: Bus speed (slot 0) = 50000000Hz (slot req
50000000Hz, actual 25000000HZ div = 1)
[ 83.750000] mmc1: new high speed SD card at address 0007
[ 83.760000] mmcblk0: mmc1:0007 SD02G 1.84 GiB
[ 83.780000] mmcblk0: p1
Below is the log message with my change to reset the bit, Hardware Locked Error.
This error is not happening always, I was testing the driver removing mmc card
without unmount.
[ 118.310000] end_request: I/O error, dev mmcblk1, sector 1108
[ 118.310000] mmcblk1: error -123 sending read/write command, response 0x0,
card status 0x0
[ 118.310000] end_request: I/O error, dev mmcblk1, sector 1109
[ 124.190000] mmc_host mmc1: Bus speed (slot 0) = 50000000Hz (slot req
400000Hz, actual 403225HZ div = 62)
[ 124.690000] mmc_host mmc1: Timeout sending command (cmd 0x202000 arg 0x0
status 0x80202000)
[ 124.690000] mmc_host mmc1: Hardware locked error (cmd 0x202000 arg 0x0)
[ 125.550000] mmc_host mmc1: Bus speed (slot 0) = 50000000Hz (slot req
50000000Hz, actual 25000000HZ div = 1)
[ 125.560000] mmc1: new high speed SD card at address 0007
[ 125.560000] mmcblk0: mmc1:0007 SD02G 1.84 GiB
[ 125.570000] mmcblk0: p1
Cheers,
Dongjin.
> > Cheers,
> > Dongjin.
> >
> > diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> > index 2f7f5ee..05ccee8 100644
> > --- a/drivers/mmc/host/dw_mmc.c
> > +++ b/drivers/mmc/host/dw_mmc.c
> > @@ -520,15 +520,33 @@ 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;
> > + u32 ctrl;
> >
> > +resend:
> > 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;
> > +
> > + if (host->cmd_status & SDMMC_INT_HLE) {
> > + dev_err(&slot->mmc->class_dev,
> > + "Hardware locked error (cmd %#x arg %#x)\n",
> > + cmd, arg);
> > +
> > + ctrl = mci_readl(host, CTRL);
> > + ctrl |= SDMMC_CTRL_RESET;
> > + mci_writel(host, CTRL, ctrl);
> > +
> > + host->cmd_status &= ~SDMMC_INT_HLE;
> > +
> > + goto resend;
> > + }
> > }
> > +
> > dev_err(&slot->mmc->class_dev,
> > "Timeout sending command (cmd %#x arg %#x status %#x)\n",
> > cmd, arg, cmd_status);
> > @@ -1429,6 +1447,12 @@ static irqreturn_t dw_mci_interrupt(int irq, void
> > *dev_id)
> > if (!pending)
> > break;
> >
> > + if (pending & SDMMC_INT_HLE) {
> > + mci_writel(host, RINTSTS, SDMMC_INT_HLE);
> > + host->cmd_status = status;
> > + smp_wmb();
> > + }
> > +
> > if (pending & DW_MCI_CMD_ERROR_FLAGS) {
> > mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
> > host->cmd_status = status;
> >
> > --
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> >
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