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 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(+) -- 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
