On 3/10/20 2:59 PM, Sowjanya Komatineni wrote:
On 3/10/20 10:27 AM, Sowjanya Komatineni wrote:
On 3/10/20 10:09 AM, Ulf Hansson wrote:
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> I would like to get the regression fixed asap, but I also would > like > to avoid reverting patches, unless really necessary. May I > propose the > following two options. > > 1. Find out why polling with ->card_busy() or CMD13, for a CMD6 > with > an R1 response doesn't work - and then fix that behaviour. > > 2. Set the mmc->max_busy_timeout to zero for sdhci-tegra, which > makes > the core to always use R1B for CMD6 (and erase). This also means > that > when the cmd->busy_timeout becomes longer than 11s, sdhci-tegra > must > disable the HW busy timeout and just wait "forever". > > If you decide for 2, you can add the software timeout support on > top, > but make that can be considered as a next step of an improvement, > rather than needed as fix. Note that, I believe there are some > support > for software timeout already in the sdhci core, maybe you need to > tweak it a bit for your case, I don't know. > > Kind regards > Uffe Hi Uffe
Will go with 2nd option and will send patches out when ready.
Okay, good.
BTW, Tegra host also supports SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK for data timeout based on host clock when using finite mode (HW busy detection based on DATA TIMEOUT count value when cmd operation timeout is < 11s for tegra host).
So, looks like we cant set host max_busy_timeout to 0 for Tegra host to force R1B during SWITCH and SLEEP_AWAKE.
So, was thinking to introduce host capability MMC_CAP2_LONG_WAIT_HW_BUSY which can be used for hosts supporting long or infinite HW busy wait detection and will update mmc and mmc_ops drivers to not allow convert R1B to R1B for hosts with this capability during SLEEP_AWAKE and SWITCH.
That seems reasonable, it becomes probably both easier and clearer by adding a new host cap.
In any case, let me help out and cook a patch for this for the core part (I leave the sdhci change to you). It may be a bit tricky, especially since I have currently queued a bunch of new changes for v5.7, that enables more users of mmc_poll_for_busy() in the core. Maybe I need to temporarily drop them, so we can fix these problems first. I will check.
Probably, I would also name the cap MMC_CAP_HW_NEED_RSP_BUSY, as that seems to be describing the common problem we have for sdhci omap/tegra.
Finally, it seems like MMC_CAP_WAIT_WHILE_BUSY should be set for sdhci- tegra, so while at it, perhaps you can cook a patch for that as well.
Kind regards Uffe
OK, I sent v1 yesterday. Please ignore them then.
Oh, I haven't seen them. In any case, I am ignoring them.
Will send out patches only for HW busy wait modes program based on cmd timeout and WAIT_WHILE_BUSY enabled.
Great, thanks!
Please help test the series I just posted as well, if you have the time ofcourse.
Kind regards Uffe
Sure,
Thanks
Sowjanya
mmc_sleep() also needs update to force R1B when host sets capability MMC_CAP_NEED_RSP_BUSY
Tested patches and they work good.