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SubjectRe: A MMC card transfer issue
Date
Hi Park,

Though I tried to patch yours to "sdhci.c" of linux-2.6.36,
but it seems your patch has already patched in linux-2.6.36.

Using this linux, MMC card is not recognized.
Inserting the MMC card, I saw the following erro message.

[ 11.035441] sdhci: Secure Digital Host Controller Interface driver
[ 11.035450] sdhci: Copyright(c) Pierre Ossman
[ 11.058295] sdhci-pci 0000:02:04.0: SDHCI controller found [8086:8809] (rev 1)
[ 11.058342] alloc irq_desc for 18 on node -1
[ 11.058350] alloc kstat_irqs on node -1
[ 11.058373] sdhci-pci 0000:02:04.0: PCI INT C -> GSI 18 (level, low) -> IRQ 18
[ 11.058385] sdhci-pci 0000:02:04.0: Invalid iomem size. You may experience problems.
[ 11.058487] sdhci-pci 0000:02:04.0: setting latency timer to 64
[ 11.058623] Registered led device: mmc0::
[ 11.058736] mmc0: SDHCI controller on PCI [0000:02:04.0] using DMA
[ 11.058774] sdhci-pci 0000:02:04.1: SDHCI controller found [8086:880a] (rev 1)
[ 11.058816] sdhci-pci 0000:02:04.1: PCI INT C -> GSI 18 (level, low) -> IRQ 18
[ 11.058828] sdhci-pci 0000:02:04.1: Invalid iomem size. You may experience problems.
[ 11.058904] sdhci-pci 0000:02:04.1: setting latency timer to 64
[ 11.059047] Registered led device: mmc1::
[ 11.059153] mmc1: SDHCI controller on PCI [0000:02:04.1] using DMA
[ 11.547645] mmc1: new high speed SD card at address 0ec7
[ 11.629400] mmcblk0: mmc1:0ec7 SV02G 1.87 GiB (ro)
[ 11.630314] mmcblk0: p1
[ 12.076459] gzip used greatest stack depth: 6008 bytes left
[ 12.321795] ip used greatest stack depth: 5724 bytes left
[ 13.786510] EXT3-fs (dm-0): using internal journal
[ 13.887463] EXT3-fs: barriers not enabled
[ 13.887872] kjournald starting. Commit interval 5 seconds
[ 13.888154] EXT3-fs (sda1): using internal journal
[ 13.888178] EXT3-fs (sda1): mounted filesystem with writeback data mode
[ 23.183874] Adding 2064380k swap on /dev/mapper/VolGroup00-LogVol01. Priority:-1 extents:1 across:2064380k
[ 39.171225] gconfd-2 used greatest stack depth: 5692 bytes left
[ 86.545435] metacity[2318]: segfault at 0 ip 080aa093 sp bfd899a0 error 4 in metacity[8048000+82000]
[ 115.124784] hda-intel: Invalid position buffer, using LPIB read method instead.
[ 115.124821] hda-intel: IRQ timing workaround is activated for card #0. Suggest a bigger bdl_pos_adj.
[ 346.630117] mmc1: card 0ec7 removed
[ 408.266730] mmc1: new MMC card at address 0001
[ 408.268142] mmcblk0: mmc1:0001 MMC 1.87 GiB
[ 408.275970] mmcblk0: retrying using single block read
[ 408.278451] mmcblk0: error -84 transferring data, sector 0, nr 8, card status 0x900
[ 408.278464] end_request: I/O error, dev mmcblk0, sector 0
[ 408.280966] mmcblk0: error -84 transferring data, sector 1, nr 7, card status 0x900
[ 408.280978] end_request: I/O error, dev mmcblk0, sector 1

I have suspected mmc.c is buggy.
I tried to disable like the following in "mmc_init_card".
As a result, the MMC card to be recognized correctly.
What's do you think ?

*/
static int mmc_init_card(struct mmc_host *host, u32 ocr,
struct mmc_card *oldcard)
{
......
/*
* Activate wide bus (if supported).
*/
#if 0 //101111
if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
(host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
unsigned ext_csd_bit, bus_width;
if (host->caps & MMC_CAP_8_BIT_DATA) {
ext_csd_bit = EXT_CSD_BUS_WIDTH_8;
bus_width = MMC_BUS_WIDTH_8;
} else {
ext_csd_bit = EXT_CSD_BUS_WIDTH_4;
bus_width = MMC_BUS_WIDTH_4;
}
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_BUS_WIDTH, ext_csd_bit);

if (err && err != -EBADMSG)
goto free_card;
if (err) {
printk(KERN_WARNING "%s: switch to bus width %d "
"failed\n", mmc_hostname(card->host),
1 << bus_width);
err = 0;
} else {
mmc_set_bus_width(card->host, bus_width);
}
}
#endif //101111



------
Thanks,
Tomoya MORINAGA
OKI SEMICONDUCTOR CO., LTD.


----- Original Message -----
From: "Kyungmin Park" <kmpark@infradead.org>
To: "Tomoya MORINAGA" <tomoya-linux@dsn.okisemi.com>
Cc: <linux-mmc@vger.kernel.org>; <linux-kernel@vger.kernel.org>; "Andrew"" <andrew.chih.howe.khor@intel.com>;
<kok.howg.ewe@intel.com>
Sent: Tuesday, November 09, 2010 2:53 PM
Subject: Re: A MMC card transfer issue

> 2010/11/9 Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>:
> > I am facing the issue about some MMC cards on Intel EG20T PCH (Platform Controller Hub).
> > The linux version is 2.6.36.
> > I can not transfer data the MMC cards (e.g. Transcned MMC card).
> > The card is 1 bit bus width. And the card is according to MMC specification V3.x.
> > And the EG20T has a 4 bit bus width capability
> > Linux MMC standard driver decides the card bus width as 4 bit,
> > if the MMC specification version is larger than or equal to V4.0 like below.
> >
> > linux/drivers/mmc/core/mmc.c
> >
> > 505 /*
> > 506 * Activate wide bus (if supported).
> > 507 */
> > 508 if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
> > 509 (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
> > 510 unsigned ext_csd_bit, bus_width;
> > 511
> > 512 if (host->caps & MMC_CAP_8_BIT_DATA) {
> > 513 ext_csd_bit = EXT_CSD_BUS_WIDTH_8;
> > 514 bus_width = MMC_BUS_WIDTH_8;
> > 515 } else {
> > 516 ext_csd_bit = EXT_CSD_BUS_WIDTH_4;
> > 517 bus_width = MMC_BUS_WIDTH_4;
> > 518 }
> > 519
> > 520 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> > 521 EXT_CSD_BUS_WIDTH, ext_csd_bit);
> > 522
> > 523 if (err && err != -EBADMSG)
> > 524 goto free_card;
> > 525
> > 526 if (err) {
> > 527 printk(KERN_WARNING "%s: switch to bus width %d "
> > 528 "failed\n", mmc_hostname(card->host),
> > 529 1 << bus_width);
> > 530 err = 0;
> > 531 } else {
> > 532 mmc_set_bus_width(card->host, bus_width);
> > 533 }
> > 534 }
> > 535
> >
> > However the MMC specification version id is the same as V3.x and V4.0.
> > Therefore the driver uses the 4 bit bus width for the MMC card
> > even if the card has only 1 bit bus width.
> > I modified the driver to use 1 bit bus width only tentatively and confirmed that
> > we can mount the card and R/W correctly.
> >
> > I think we can not support MMC_CAP_4_BIT_DATA or MMC_CAP_8_BIT_DATA in MMC V4.0.
> >
> > How do you think ?
>
> You can find a patch for 4-bit support. the problem is there's some
> bug related so it set the 4 & 8 bit support both.
> So line 512 is always true. you can just remove the one line like this.
>
> It's quirk-and-dirty patch. now we try to find a generic solution to
> solve this issue.
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1849,7 +1849,7 @@ int sdhci_add_host(struct sdhci_host *host)
> mmc->caps |= MMC_CAP_SDIO_IRQ;
>
> if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
> - mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA;
> + mmc->caps |= MMC_CAP_4_BIT_DATA;
>
> if (caps & SDHCI_CAN_DO_HISPD)
> mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
>
> Thank you,
> Kyungmin Park
> >
> > --
> > Thanks,
> > Tomoya MORINAGA(OKI SEMICONDUCTOR CO., LTD.)
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
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> >
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