S3C2416 fixes (gpiolib, SDHCI, compilation without FB device)

[Marek Szyprowski]

Hello,

On Tuesday, July 06, 2010 7:03 PM Darius Augulis wrote:

> On 06/28/2010 09:01 AM, Marek Szyprowski wrote:
> > Hello,
> >
> > On Friday, June 25, 2010 12:56 PM Darius Augulis wrote:
> >
> >> On 06/22/2010 04:16 PM, Yauhen Kharuzhy wrote:
> >>> This patch series fixes SDHCI on S3C2416. I got SD card working with
> this
> >> patches
> >>> and with patches for GPIO card detection support by Marek Szyprowski.
> >>>
> >>
> >> Unfortunately I did not get SD card working with these patches. I'm
> >> using custom board, not SMDK2416, but SD slot connection and schematics
> >> are the same like in SMDK2416. I've tried to debug a bit this problem
> >> and this is what I got: kernel do detection of card insert/remove,
> >> driver prints messages:
> >>
> >> s3c-sdhci s3c-sdhci.1: card inserted.
> >> s3c-sdhci s3c-sdhci.1: card removed.
> >>
> >> Then I put some printk in s3c-sdhci driver and MMC core and found that
> >> mmc_rescan() is called only once at startup and no more when
> >> inserting/removing SD card. Also mmc_rescan() stops at that point where
> >> mmc_power_up() is called and does not return. And mmc_power_up() stops
> >> where mmc_delay(10) is called and does not return too.
> >> Every time when inserting/removing SD card only functions
> >> sdhci_tasklet_card() and mmc_detect_change() are called, and nothing
> >> happens. Kernel doesn't detect the card inserted.
> >> Maybe this info could help to debug where the problem is - in my custom
> >> board or in your patches?
> >
> > Have you tried with polled card detection method (SDHCI_CD_NONE)? If it
> > doesn't work I suspect something with the hardware. Checking with mmc
> debug
> > enabled might also help figuring this issue out.
> 
> yes, I've tried that, but didn't get sd card working. I got schematics
> from China manufacturer, SD card connection is the same like in
> smdk2416. with mmc debug enabled I found that SD card is detected when
> inserted or removed, but after detection card initialisation is not
> performed.

Does it work without my patches or with other Linux kernel? You can try to 
check the custom Linux 2.6.29 from 
git://git.kernel.org/pub/scm/linux/kernel/git/kki_ap/linux-2.6-samsung.git

I would like to know whether my patches cause the problem or there is some
kind of hardware issue with your board.

Best regards
--
Marek Szyprowski
Samsung Poland R&D Center