i.MX25 esdhc2 incomplete cmd0 transmission

[Markus Pargmann]

Hi Fabio,

On Tue, Aug 05, 2014 at 04:09:01PM +0000, Fabio.Estevam at freescale.com wrote:
> [Sorry for top-posting here]
> 
> Are you sure 0x00000000 are the correct values for the IOMUX?

I tried different values for the pin configuration without success.
0x0 was without any pull/keeper, so I assumed it was the correct
configuration. I also tried again with a 100k internal pull-up
(0x000000e0) with no difference.

Also the beginning of cmd0 is transmitted, so I think it would be
strange if the rest of cmd0 is missing because of wrong pincontrol
settings.

> 
> Or do you mean 0x80000000, which would let the same IOMUX as configured by the bootloader?

No, as I am testing in the bootloader so they would be the reset value
of the registers.

> 
> Are you able to correctly access port esdhc2 from the bootloader?

I used barebox to make all the oscilloscope pictures. ESDHC1 works in
barebox without issues.

Thank you,

Markus

> 
> ________________________________________
> From: Markus Pargmann <mpa at pengutronix.de>
> Sent: Tuesday, July 29, 2014 9:48 AM
> To: Guo Shawn-R65073
> Cc: Estevam Fabio-R49496; linux-arm-kernel at lists.infradead.org; kernel at pengutronix.de
> Subject: i.MX25 esdhc2 incomplete cmd0 transmission
> 
> Hi,
> 
> This mail did not reach the mailinglist, so here is the same mail
> without the images attached.
> 
> On Mon, Jul 28, 2014 at 10:06:33AM +0200, Markus Pargmann wrote:
> > Hi,
> >
> > I am currently having a Board with an i.MX25 which has an SD-Card slot
> > wired to the CSI pins (ESDHC2). I can see the correct clock and the beginning of
> > the cmd0 on the CMD wire (01 00000). But the arguments and CRC that
> > should follow the comand are missing. The card doesn't respond to this.
> > The same behavior is observable on the karo tx25 module with an
> > oscilloscope on ESDHC2.
> >
> > The tx25 works correctly with the same software and the ESDHC1. I can
> > see the complete cmd0 command even without any SD card plugged in, as
> > expected. I attached some oscilloscope pictures of these two cases to
> > this mail.
> >
> > This is the pincontrol setup I am using for esdhc2 on karo tx25:
> >
> > #define MX25_PAD_CSI_HSYNC__SDHC2_DAT2                0x148 0x340 0x4ec 0x02 0x001
> > #define MX25_PAD_CSI_MCLK__SDHC2_DAT0         0x140 0x338 0x4e4 0x02 0x001
> > #define MX25_PAD_CSI_PIXCLK__SDHC2_DAT3               0x14c 0x344 0x4f0 0x02 0x001
> > #define MX25_PAD_CSI_VSYNC__SDHC2_DAT1                0x144 0x33c 0x4e8 0x02 0x001
> > #define MX25_PAD_CSI_D6__SDHC2_CMD            0x130 0x328 0x4e0 0x02 0x001
> > #define MX25_PAD_CSI_D7__SDHC2_DAT_CLK                0x134 0x32C 0x4dc 0x02 0x001
> >       esdhc {
> >               pinctrl_esdhc2: esdhc2 {
> >                       fsl,pins = <
> >                               MX25_PAD_CSI_HSYNC__SDHC2_DAT2          0x00000000
> >                               MX25_PAD_CSI_MCLK__SDHC2_DAT0           0x00000000
> >                               MX25_PAD_CSI_PIXCLK__SDHC2_DAT3         0x00000000
> >                               MX25_PAD_CSI_VSYNC__SDHC2_DAT1          0x00000000
> >                               MX25_PAD_CSI_D6__SDHC2_CMD              0x00000000
> >                               MX25_PAD_CSI_D7__SDHC2_DAT_CLK          0x00000000
> >                       >;
> >               };
> >       };
> >
> > Any ideas what may be wrong/missing?
> 
> Here are the images uploaded to a ftp server:
> 
> karo tx25 esdhc1 initial communication without SD card inserted:
> ftp://ftp.pengutronix.de/pub/20140729_imx25-esdhc2-scope/karo_2.png
> ftp://ftp.pengutronix.de/pub/20140729_imx25-esdhc2-scope/karo.png
> 
> and the same with karo tx25 esdhc2 and the above pincontrol setup:
> ftp://ftp.pengutronix.de/pub/20140729_imx25-esdhc2-scope/karo_esdhc2.png
> ftp://ftp.pengutronix.de/pub/20140729_imx25-esdhc2-scope/karo_esdhc2_2.png
> 
> Thanks,
> 
> Markus
> 
> --
> Pengutronix e.K.                           |                             |
> Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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> 

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |
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