Your board setup file in arch/arm/mach-omap2/whatever.c should have a
struct twl4030_hsmmc_info that sets up the platform dependent info
about your board:
static struct twl4030_hsmmc_info mmc[] = {
{
.mmc = 1,
.wires = 4,
.gpio_cd = -EINVAL,
.gpio_wp = -EINVAL,
},
{} /* Terminator */
};
I believe you can set wires to 1 to force it to only use 1 wire.
On Tue, Oct 6, 2009 at 3:18 PM, John Faith <jfai...@gmail.com> wrote:
>
> Hi,
> I have a prototype board based on the 3530EVM which cannot read its
> microSD card. I enabled CONFIG_MMC_DEBUG and other printks to the
> 2.6.29rc3 kernel and can see that info like the transfer rate is
> coming back but after I reach mmc_set_clock() and setting the bus
> width, I just get timeouts (output below).
>
> Looking at DAT0-3 on a scope, I see activity on DAT0, but the other
> lines just follow the MMC power, up for ~800ms then off.
>
> As an experiment, I tried commenting-out these 2 lines in
> drivers/mmc/host/omap_hsmmc.c:
> mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED;
> ...
> mmc->caps |= MMC_CAP_4_BIT_DATA;
>
> in an attempt to use slow, 1-wire transfers, but that got me a panic
> in mmc_omap_irq().
>
> Assuming the hardware is functioning, is there a way to force the SD
> controller into its simplest/slowest mode to improve my chances of
> reading the card?
>
> Thanks!
> ,
> John
>
> ...
> mmc0: starting CMD9 arg 8fe40000 flags 00000007
> MMC: IRQ Status is 1
> drivers/mmc/core/sd.c 102 mmc_decode_csd() csd_struct=0
> tacc_ns=0
> tacc_clks=0
> max_dtr=25000000
> cmdclass=1461
> capacity=7744512
> drivers/mmc/core/sd.c 67 mmc_decode_cid() manfid=3
> prod_name=SU04G
> card type=1
> card state=8
> mmc0: starting CMD7 arg 8fe40000 flags 00000015
> MMC: IRQ Status is 1
> mmc0: starting CMD55 arg 8fe40000 flags 00000095
> MMC: IRQ Status is 1
> mmc0: starting CMD51 arg 00000000 flags 000000b5
> MMC: IRQ Status is 3
> drivers/mmc/core/sd.c 183 mmc_decode_scr()
> mmc0: starting CMD6 arg 00fffff1 flags 000000b5
> MMC: IRQ Status is 3
> drivers/mmc/core/sd.c 261 mmc_switch_hs()
> mmc0: starting CMD6 arg 80fffff1 flags 000000b5
> MMC: IRQ Status is 3
> card->csd.max_dtr=25000000
> mmc_card_highspeed true
> max_dtr=50000000
> drivers/mmc/core/core.c:443 mmc_set_clock()
> mmc_app_set_bus_width()
> mmc_app_set_bus_width MMC_BUS_WIDTH_4
> mmc0: starting CMD55 arg 8fe40000 flags 00000095
> MMC: IRQ Status is 18000
> mmc0: starting CMD55 arg 8fe40000 flags 00000095
> drivers/mmc/host/omap_hsmmc.c 535
> MMC: IRQ Status is 18000
> mmc0: starting CMD55 arg 8fe40000 flags 00000095
> MMC: IRQ Status is 18000
> mmc0: starting CMD55 arg 8fe40000 flags 00000095
> MMC: IRQ Status is 18000
> drivers/mmc/core/sd.c 559 mmc_app_set_bus_width failed
> mmc0: error -110 whilst initialising SD card
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