MXC MMC driver and SDIO peripherals

From: dcbw@redhat.com (Dan Williams)
To: linux-arm-kernel@lists.infradead.org
Subject: MXC MMC driver and SDIO peripherals
Date: Wed, 21 Oct 2009 13:15:19 -0700	[thread overview]
Message-ID: <1256156119.8469.40.camel@localhost.localdomain> (raw)
In-Reply-To: <20091021192038.GK14091@buzzloop.caiaq.de>

On Wed, 2009-10-21 at 21:20 +0200, Daniel Mack wrote:
> Hi,
> 
> we're having trouble getting SDIO connected harware to fly on MX31 based
> designs. In particular, a SD8686 chip supported by the libertas_sdio
> driver will hang forever when built without CONFIG_MMC_DEBUG=y. With
> that option selected, however, the behaviour is a little different, and
> I can at least see the following messages on a recent 2.6.32-rc5 based
> MX31 tree.
> 
> Is there any common pitfall for such setups? I did more or less the same
> thing on PXAs (same WLAN chip, same kind of interface, same firmware),
> and haven't seen any such effects, so I suspect the MXC specific parts
> to be the reason for that. Any ideas?

Any idea what quirks your SDHC is using if any?  Does it require PIO or
can it do DMA?  Does it have any transfer restrictions on block size or
bit-width?  What is the debug output of the MMC stack when loading the
module for your SDHC?

Dan

> Thanks,
> Daniel
> 
> 
> [    1.450000] mmc0: new SDIO card at address 0001
> ...
> # modprobe libertas_sdio
> [   15.180000] libertas_sdio: Libertas SDIO driver
> [   15.180000] libertas_sdio: Copyright Pierre Ossman
> [   15.190000] libertas_sdio mmc0:0001:1: firmware: requesting sd8686_helper.bin
> [   15.320000] libertas_sdio mmc0:0001:1: firmware: requesting sd8686.bin
> [   15.840000] libertas: 00:19:88:03:13:5a, fw 8.73.7p3, cap 0x00000393
> [   16.870000] libertas: problem fetching packet from firmware
> [   18.840000] libertas: command 0x001e timed out
> [   18.840000] libertas: requeueing command 0x001e due to timeout (#1)
> [   18.870000] libertas: Received result 0 to command 1e after 1 retries
> [   18.910000] libertas: wlan0: Marvell WLAN 802.11 adapter
> 
> # ifconfig wlan0 up
> [  216.760000] ADDRCONF(NETDEV_UP): wlan0: link is not ready
> [  217.800000] libertas: problem fetching packet from firmware
> [  219.770000] libertas: command 0x0010 timed out
> [  219.770000] libertas: requeueing command 0x0010 due to timeout (#1)
> [  219.800000] libertas: Received result 0 to command 10 after 1 retries
> 
> # iwlist wlan0 scan
> [  244.260000] libertas: problem fetching packet from firmware
> [  247.800000] libertas: command 0x0006 timed out
> [  247.800000] libertas: requeueing command 0x0006 due to timeout (#1)
> [  248.260000] libertas: Received result 0 to command 6 after 1 retries
> [  249.920000] libertas: problem fetching packet from firmware
> [  253.560000] libertas: command 0x0006 timed out
> [  253.560000] libertas: requeueing command 0x0006 due to timeout (#1)
> [  254.920000] libertas: problem fetching packet from firmware
> wlan0     Failed to read scan data : Resource temporarily unavailable
> 
> 
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