Re: OMAP3xxx hsmmc : MMC3 doesn't work, always times out?

[Hugo Vincent <hugo.vincent@xxxxxxxxx>]

On 11/06/2009, at 9:29 PM, Grazvydas Ignotas wrote:

> On Thu, Jun 11, 2009 at 10:43 AM, Hugo  
> Vincent<hugo.vincent@xxxxxxxxx> wrote:
> > On 11/06/2009, at 6:08 PM, Peter Barada wrote:
> >
> > > On Thu, 2009-06-11 at 15:35 +1200, Hugo Vincent wrote:
> > > > On Thu, Jun 11, 2009 at 2:39 PM, Pandita, Vikram<vikram.pandita@xxxxxx 
> > > > >
> > > > wrote:
> > > > > Hugo
> > > > >
> > > > > > -----Original Message-----
> > > > > > From: linux-omap-owner@xxxxxxxxxxxxxxx
> > > > > > [mailto:linux-omap-owner@xxxxxxxxxxxxxxx] On Behalf Of Hugo
> > > > > > Vincent
> > > > > > Sent: Wednesday, June 10, 2009 9:14 PM
> > > > > > To: linux-omap; General mailing list for gumstix users.
> > > > > > Subject: OMAP3xxx hsmmc : MMC3 doesn't work, always times out?
> > > > > >
> > > > > > Hi everyone,
> > > > > >
> > > > > > I'm trying to get the MMC3 slot working on my OMAP3503 Gumstix  
> > > > > > Overo
> > > > > > based board working.
> > > > >
> > > > > Please check if your MMC3 Mux setting are as follows:
> > > > > Note the input configuration for CLK and CMD. This is needed.
> > > > >
> > > > > /* MMC3 */
> > > > > MUX_CFG_34XX("AF10_3430_MMC3_CLK", 0x1d0,
> > > > >            OMAP34XX_MUX_MODE3 | OMAP34XX_PIN_INPUT_PULLUP)
> > > > > MUX_CFG_34XX("AC3_3430_MMC3_CMD", 0x5d8,
> > > > >            OMAP34XX_MUX_MODE2 | OMAP34XX_PIN_INPUT_PULLUP)
> > > > > MUX_CFG_34XX("AE11_3430_MMC3_DAT0", 0x5e4,
> > > > >            OMAP34XX_MUX_MODE2 | OMAP34XX_PIN_INPUT_PULLUP)
> > > > > MUX_CFG_34XX("AH9_3430_MMC3_DAT1", 0x5e6,
> > > > >            OMAP34XX_MUX_MODE2 | OMAP34XX_PIN_INPUT_PULLUP)
> > > > > MUX_CFG_34XX("AF13_3430_MMC3_DAT2", 0x5e8,
> > > > >            OMAP34XX_MUX_MODE2 | OMAP34XX_PIN_INPUT_PULLUP)
> > > > > MUX_CFG_34XX("AF13_3430_MMC3_DAT3", 0x5e2,
> > > > >            OMAP34XX_MUX_MODE2 | OMAP34XX_PIN_INPUT_PULLUP)
> > > > >
> > > > >
> > > > > Also we will be soon (tomorrow) posting MUX patch for MMC1,2,3.
> > > >
> > > > Thanks for that Vikram. Unfortunately, these are the exact mux &
> > > > pullup settings I was already using. (In my case, they were set by
> > > > u-boot, but to be sure, I've copied and pasted the above exactly  
> > > > into
> > > > mach-omap2/mux.c - same result). Any other ideas?
> > >
> > > Are you using a 1.8V capable SD/MMC card?  MMC3 only works at 1.8V  
> > > on
> > > the 3430 - MMC1 can work at 3V due to PBIAS register settings.  If
> > > you're not, then the MMC can talk to the card, but the card can't
> > > understand what its seeing due to the volatages of CLK/CMD being too
> > > low...
> >
> > I am using a 3V SD card. But I'm also using TI TXS02612 for level
> > translation (and to multiplex between two slots - but for now I  
> > only need to
> > get one slot working and thus the select pin is wired high). I'm  
> > pretty
> > confident that the level translation is working correctly as (a)  
> > the clk and
> > cmd signals come out to the correct pins on the socket at the  
> > correct levels
> > and (b) remultiplexing the datX signals as GPIOs and driving them is
> > correctly reflected (and at the correct 3V levels) on the correct  
> > pins on
> > the card socket. Similarly in the card->OMAP direction of signaling  
> > (they
> > are of course bidirectional level translators).
> >
> > Do I need to somehow tell the mmc host or core driver that I have  
> > external
> > level translation and therefore not to worry that the host only  
> > supports
> > 1.8V cards?
>
> The TRM says MMC3 "is used without external transceiver" [only?].
> Doesn't the transceiver need additional control signals (dir_cmd and
> dir_dat[2:0]), that are only provided by MMC2?

You are quite possibly correct, but the level translator I'm using is  
"invisible" - it doesn't require the transceiver control signals  
offered only on MMC2. So as far as I know, there is no hardware reason  
the OMAP MMC3 controller couldn't talk correctly at the electrical  
level with the card. This is evidenced by the CMD signal being  
correctly level translated (and this is via the same type of level  
translator as the data signals are according to the TXS02612  
datasheet), and toggling correctly(-looking) at the card socket (i.e.  
between 0 and 3.3V and it's edges synced to the clock signal). The  
DAT0-DAT3 signals never do anything though.

Hugo

> > Thanks for your help!
> >
> > Hugo
> >
> > > > > > Compiling 2.6.29-omap1 with
> > > > > >  CONFIG_MMC=y
> > > > > >  CONFIG_MMC_DEBUG=y
> > > > > >  CONFIG_MMC_BLOCK=y
> > > > > >  CONFIG_MMC_BLOCK_BOUNCE=y
> > > > > > and MMC polling enabled (mmc->caps |= MMC_CAP_NEEDS_POLL; in
> > > > > > omap_hsmmc.c)
> > > > > >
> > > > > > then doing: $ echo 8 > /proc/sys/kernel/printk
> > > > > > gives the following:
> > > > > >
> > > > > > clock 0Hz busmode 1 powermode 1 cs 0 Vdd 20 width 0 timing 0
> > > > > > mmc2: clock 400000Hz busmode 1 powermode 2 cs 0 Vdd 20 width 0  
> > > > > > timing 0
> > > > > > mmc2: clock 400000Hz busmode 1 powermode 2 cs 1 Vdd 20 width 0  
> > > > > > timing 0
> > > > > > mmc2: starting CMD0 arg 00000000 flags 000000c0
> > > > > > mmci-omap-hs mmci-omap-hs.2: mmc2: CMD0, argument 0x00000000
> > > > > > mmci-omap-hs mmci-omap-hs.2: IRQ Status is 1
> > > > > > mmc2: req done (CMD0): 0: 00000000 00000000 00000000 00000000
> > > > > > mmc2: clock 400000Hz busmode 1 powermode 2 cs 0 Vdd 20 width 0  
> > > > > > timing 0
> > > > > > mmc2: starting CMD8 arg 000001aa flags 000002f5
> > > > > > mmci-omap-hs mmci-omap-hs.2: mmc2: CMD8, argument 0x000001aa
> > > > > > mmci-omap-hs mmci-omap-hs.2: IRQ Status is 18000
> > > > > > mmci-omap-hs mmci-omap-hs.2: MMC IRQ 0x18000 : ERRI CTO
> > > > > > mmc2: req done (CMD8): -110: 00000000 00000000 00000000 00000000
> > > > > > mmc2: starting CMD5 arg 00000000 flags 000002e1
> > > > > > mmci-omap-hs mmci-omap-hs.2: mmc2: CMD5, argument 0x00000000
> > > > > > mmci-omap-hs mmci-omap-hs.2: IRQ Status is 18000
> > > > > > mmci-omap-hs mmci-omap-hs.2: MMC IRQ 0x18000 : ERRI CTO
> > > > > > mmc2: req failed (CMD5): -110, retrying...
> > > > > > mmci-omap-hs mmci-omap-hs.2: mmc2: CMD5, argument 0x00000000
> > > > > > mmci-omap-hs mmci-omap-hs.2: IRQ Status is 18000
> > > > > > mmci-omap-hs mmci-omap-hs.2: MMC IRQ 0x18000 : ERRI CTO
> > > > > > mmc2: req failed (CMD5): -110, retrying...
> > > > > > mmci-omap-hs mmci-omap-hs.2: mmc2: CMD5, argument 0x00000000
> > > > > > mmci-omap-hs mmci-omap-hs.2: IRQ Status is 18000
> > > > > > mmci-omap-hs mmci-omap-hs.2: MMC IRQ 0x18000 : ERRI CTO
> > > > > > mmc2: req failed (CMD5): -110, retrying...
> > > > > > mmci-omap-hs mmci-omap-hs.2: mmc2: CMD5, argument 0x00000000
> > > > > > mmci-omap-hs mmci-omap-hs.2: IRQ Status is 18000
> > > > > > mmci-omap-hs mmci-omap-hs.2: MMC IRQ 0x18000 : ERRI CTO
> > > > > > mmc2: req done (CMD5): -110: 00000000 00000000 00000000 00000000
> > > > > > mmc2: starting CMD55 arg 00000000 flags 000000f5
> > > > > > mmci-omap-hs mmci-omap-hs.2: mmc2: CMD55, argument 0x00000000
> > > > > > mmci-omap-hs mmci-omap-hs.2: IRQ Status is 18000
> > > > > > mmci-omap-hs mmci-omap-hs.2: MMC IRQ 0x18000 : ERRI CTO
> > > > > > mmc2: req done (CMD55): -110: 00000000 00000000 00000000 00000000
> > > > > > mmc2: starting CMD55 arg 00000000 flags 000000f5
> > > > > > mmci-omap-hs mmci-omap-hs.2: mmc2: CMD55, argument 0x00000000
> > > > > > mmci-omap-hs mmci-omap-hs.2: IRQ Status is 18000
> > > > > > mmci-omap-hs mmci-omap-hs.2: MMC IRQ 0x18000 : ERRI CTO
> > > > > > mmc2: req done (CMD55): -110: 00000000 00000000 00000000 00000000
> > > > > > mmc2: starting CMD55 arg 00000000 flags 000000f5
> > > > > > mmci-omap-hs mmci-omap-hs.2: mmc2: CMD55, argument 0x00000000
> > > > > > mmci-omap-hs mmci-omap-hs.2: IRQ Status is 18000
> > > > > > mmci-omap-hs mmci-omap-hs.2: MMC IRQ 0x18000 : ERRI CTO
> > > > > > mmc2: req done (CMD55): -110: 00000000 00000000 00000000 00000000
> > > > > > mmc2: starting CMD55 arg 00000000 flags 000000f5
> > > > > > mmci-omap-hs mmci-omap-hs.2: mmc2: CMD55, argument 0x00000000
> > > > > > mmci-omap-hs mmci-omap-hs.2: IRQ Status is 18000
> > > > > > mmci-omap-hs mmci-omap-hs.2: MMC IRQ 0x18000 : ERRI CTO
> > > > > > mmc2: req done (CMD55): -110: 00000000 00000000 00000000 00000000
> > > > > > mmc2: starting CMD1 arg 00000000 flags 000000e1
> > > > > > mmci-omap-hs mmci-omap-hs.2: mmc2: CMD1, argument 0x00000000
> > > > > > mmci-omap-hs mmci-omap-hs.2: IRQ Status is 18000
> > > > > > mmci-omap-hs mmci-omap-hs.2: MMC IRQ 0x18000 : ERRI CTO
> > > > > > mmc2: req done (CMD1): -110: 00000000 00000000 00000000 00000000
> > > > > > mmc2: clock 0Hz busmode 1 powermode 0 cs 0 Vdd 0 width 0 timing 0
> > > > > >
> > > > > > It seems every request returns -110 which is -ETIMEDOUT.
> > > > > >
> > > > > > I've checked the hardware, and it appears to be correct (level
> > > > > > translators etc seem to be doing their job).
> > > > > >
> > > > > > During polling, the CMD and CLK signals show activity, but the  
> > > > > > data
> > > > > > lines never change; this is presumably why every request is  
> > > > > > timing
> > > > > > out.
> > > > > >
> > > > > > I've also tried it with 2.6.30-omap1 in git, which changes some
> > > > > > MMC3-specific stuff (notably DMA), but has the exact same  
> > > > > > behaviour.
> > > > > >
> > > > > > I've also checked pin multiplexing settings and confirmed that  
> > > > > > the
> > > > > > correct values are set for the MMC3 data pins. The card I'm  
> > > > > > using is a
> > > > > > microSD card that works when attached to MMC1 (the Gumstix Overo
> > > > > > built-in microSD slot). The slot is powered by 3.3V that is  
> > > > > > always on,
> > > > > > there is no provision for power switching with this particular  
> > > > > > board.
> > > > > >
> > > > > > Any ideas?
> > > > > >
> > > > > > Many thanks,
> > > > > > Hugo Vincent
> > > > > > --
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