Oh, damn, I didn't include the proper tags, [PATCH v2] mmc: dw_mmc: Wait for data transfer after response errors. [PATCH v2] mmc: dw_mmc: Fix UHS tuning on some brand of cards should be [PATCH v2 0/1] mmc: dw_mmc: Fix UHS tuning on some brand of cards [PATCH v2 1/1] mmc: dw_mmc: Wait for data transfer after response errors. 2016-04-25 17:18 GMT+02:00 Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx>: > 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. > > 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. > > 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 > > 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(+) > > -- > 2.1.0 > -- 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
