Hi Enric, On 06/20/2016 04:59 PM, Enric Balletbo Serra wrote: > Hi Jaehoon, > > 2016-04-27 10:53 GMT+02:00 Enric Balletbo i Serra > <enric.balletbo@xxxxxxxxxxxxx>: >> >> >> On 27/04/16 10:35, Jaehoon Chung wrote: >>> On 04/26/2016 05:03 PM, Enric Balletbo i Serra wrote: >>>> Hi, >>>> >>>> I introduced the cover letter to give some background about this. >>>> >>>> I have been investigating a problem related to at least one specific sdcard when >>>> UHS-I is set. The card is not detected due the tuning phase reports a >>>> failure. Since the problem is only reproduced with a single model of a single >>>> brand of card, it is probably a card firmware issue, but the card works fine >>>> on my laptop. >>> >>> I think you have analyzed many case..of course..it was successful to switch voltage, right? >>> Maybe this patch too old..so can you remember which specific sdcard is produced? >>> >> >> Yes it was successful to switch voltage. The specific card is an UNIREX 16GB Class 10 >> SD card (Compatible with UHS-1) >> > > Any feedback for this patch? Sorry..I missed this patch..Thanks for reminding! I will check this patch as soon as possible. Best Regards, Jaehoon Chung > > >>>> >>>> The first attempt to fix this was a patch sent by Doug Anderson [1], but Alim >>>> Akhtar found that this produced randomly a hung task on Peach-pi. I can confirm >>>> that it's easy to reproduce the hung task, either, with cold boots or suspend to >>>> ram tests. >>> >>> Yep..I have already tested and checked for this. >>> >>>> >>>> I tried to fix both problems (the original issue and the one introduced by the >>>> patch) in different ways, but I ended thinking that this second proposal is the >>>> most simple that solves both issues. So let's try to fix this by handling the >>>> response CRC error slightly differently when tuning command is happening. >>>> >>>> I tested the patch on both platforms, on exynos and on rockhip. I did lots of >>>> tests and at the moment the patch seems to fix the rockchip issue and don't >>>> hung on exynos. I'll continue testing meanwhile we discuss about it. >>>> >>>> I think the patch, at least, needs the Doug's approval (as he dig into the issue >>>> before) and the Tested-by Alim. So will be good if you have a slot of time to >>>> look a bit into this. >>>> >>>> Thanks in advance. >>>> Enric >>>> >>>> [1] https://lkml.org/lkml/2015/5/18/495 >>>> >>>> Changelog since v1: >>>> - Fix the issue found by Alim with exynos letting the data transfer >>>> take place only when MMC_SEND_TUNING_BLOCK is issued. >>>> >>>> Doug Anderson (1): >>>> mmc: dw_mmc: Wait for data transfer after response errors. >>>> >>>> drivers/mmc/host/dw_mmc.c | 27 +++++++++++++++++++++++++++ >>>> 1 file changed, 27 insertions(+) >>>> >>> > > > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
