Hi, On 1 September 2015 at 00:07, Hans de Goede <hdego...@redhat.com> wrote: > Hi, > > On 30-08-15 10:30, Yousong Zhou wrote: >> >> Hi >> >> In an OpenWrt ticket [1] I reported two issues encountered by 2 SD >> cards of mine. >> >> One of them failed with `error reading clusters` when reading a uImage >> file of size about 2MB. This issue happened after we switch from DMA >> transfer to `mmc_trans_data_by_cpu()`. It is caused by fixed 2 >> seconds timeout without considering the transfer size. A fixed was >> just posted [2] in OpenWrt-devel list. >> >> The other card failed at the SPL stage with `spl: mmc init failed with >> error: -19`. That -19 is defined as macro TIMEOUT in U-Boot and it is >> comparable to -110 in Linux kernel defined as ETIMEOUT. This problem >> happened after we switch the clock divider from the >> controller-internal one to mod0-clock (commit fc3a832 "sunxi: mmc: >> Properly setup mod-clk and clock sampling phases"). Actually TIMEOUT >> is not the root cause here. It is caused by >> SUNXI_MMC_RINT_RESP_CRC_ERROR when trying to switch the card to >> highspeed mode. Unfortunately I am not familiar with sunxi clock >> system enough to provide a fix for this. >> >> More details can be found in the ticket description in link [1] >> >> [1] https://dev.openwrt.org/ticket/20387 >> [2] http://patchwork.ozlabs.org/patch/512163/ > > > Thanks for the patch I've merged it into my sunxi u-boot tree, > and send a pullreq for merging it into u-boot master. > > As for the other issue I've no idea what is going on there.
I just made a fix for that issue. It worked both for U-Boot and
Linux. The approach is that we change the bus frequency to 52MHz
before (instead of after) the access change. Well, the patch needs to
be applied on the core code. I am not sure of the possible side
effects on other cards...
Patch attached for both U-Boot and Linux.
Regards
yousong
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134-mmc-core-Set-clock-before-switching-to-highspeed-mod.patch
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0001-mmc-add-debug-message-on-failure-of-switching-to-hig.patch
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0002-mmc-set-clock-speed-before-switching-to-highspeed.patch
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