socfpga: mmc problems

[Dinh Nguyen]

Hi Jack,

On Thu, 2013-07-04 at 09:31 +0100, Jack Mitchell wrote:
> Morning Dinh,
> 
> On 03/07/13 16:09, Dinh Nguyen wrote:
> > Hi Jack,
> >
> > On Wed, 2013-07-03 at 16:01 +0100, Jack Mitchell wrote:
> >> Having received one of the new Arrow SoCkit boards at a recent training
> >> day I set about seeing how far mainline was in successfully booting this
> >> board.
> >>
> >> As I wanted to boot from mmc, I first checked out linux-next [1] in
> >> order to get the newly merged mmc driver, I then applied the device-tree
> >> enablement series [2] on top before finally attempting to boot. I then
> >> found that the standard socfpga_defconfig didn't enable the MMC drivers,
> >> which I also did (should this be part of the socfpga_defconfig...?).
> >
> > I was going to update this when I enable ethernet as well to avoid less
> > churn on the defconfig.
> 
> That's great!
> 
> >
> >>
> >> However, the boot hangs at:
> >>
> >> Synopsys Designware Multimedia Card Interface Driver
> >> dwmmc_socfpga ff704000.dwmmc0: Using internal DMA controller.
> >> dwmmc_socfpga ff704000.dwmmc0: DW MMC controller at irq 171, 32 bit host
> >> data width, 1024 deep fifo
> >>
> >> To fix this I checked out the diff between the Altera vendor mmc driver
> >> and the mainline driver and found that if I added this small change:
> >>
> >>
> >>     if (of_property_read_u32(dev->of_node, "pwr-en", &pwr_en)) {
> >>       dev_info(dev, "couldn't determine pwr-en, assuming pwr-en = 0\n");
> >>       pwr_en = 0;
> >>     }
> >>
> >>     /* Set PWREN bit */
> >>     mci_writel(host, PWREN, pwr_en);
> >
> > I tested this on my devkit, which was not made by Arrow, but is _almost_
> > the same. I'll try to see if I can get my hands on an Arrow board to
> > reproduce.
> 
> Now, I think I made a _slight_ mistake, in that I accidentally copied 
> the Altera vendor kernel onto the sdcard instead of the linux-next 
> kernel. Re-testing this morning with a fresh mind, I checked the config 
> again and now I find the Arrow board still won't boot from MMC, even 
> with the above change, with the code hanging at the same place.
> 
> I know you don't have an Arrow board, but if you have a tree which I 
> could pull from with your amalgamated changes; that would rule out me 
> missing any patches and it actually being a board problem. I can't seem 
> to see if the V8 device tree patches were pulled into anyones tree, 
> otherwise I would just wait till they appeared in 3.11-rc1...?

Unfortunately, the device tree bindings for the SD/MMC did not make it
into the arm-soc tree for 3.11, only the sd/mmc platform driver. Will
try for 3.12.

I'm sure you have seen git.rocketboards.org?

Dinh
> 
> Sorry for the confusion!
> 
> >
> >>
> >> In the dw_mci_socfpga_priv_init function, the board would boot.
> >>
> >> Synopsys Designware Multimedia Card Interface Driver
> >> dwmmc_socfpga ff704000.dwmmc0: couldn't determine pwr-en, assuming
> >> pwr-en = 0
> >> dwmmc_socfpga ff704000.dwmmc0: Using internal DMA controller.
> >> dwmmc_socfpga ff704000.dwmmc0: DW MMC controller at irq 171, 32 bit host
> >> data width, 1024 deep fifo
> >> mmc_host mmc0: Bus speed (slot 0) = 100000000Hz (slot req 400000Hz,
> >> actual 400000HZ div = 125)
> >> dwmmc_socfpga ff704000.dwmmc0: 1 slots initialized
> >> dwmmc_socfpga ff704000.dwmmc0: Version ID is 240a
> >> .....
> >> .....
> >> .....
> >>
> >>
> >> Has this been overlooked, or are there some other changes elsewhere that
> >> I haven't yet come across which addresses this?
> >
> > I'm not aware of any other changes.
> >
> > Dinh
> >>
> >> Cheers,
> >>
> >> [1] fa1383200d289afdff2f5678eb89483daa537465
> >> [2] http://comments.gmane.org/gmane.linux.ports.arm.kernel/243529
> >>
> >
> >
> >
> 
>