Hi Doug, Am 18.11.19 um 17:08 schrieb Doug Anderson: > Hi, > > > On Fri, Nov 15, 2019 at 3:19 AM Heiko Stübner <heiko@xxxxxxxxx> wrote: >> >> Hi Markus, >> >> Am Freitag, 15. November 2019, 11:37:58 CET schrieb Markus Reichl: >> > Am 14.11.19 um 14:10 schrieb Heiko Stuebner: >> > > $subject is missing the [PATCH] prefix >> > will fix. >> >> no need to resend just for this ... just to keep in mind for future patches ;-) >> >> >> > > Am Montag, 11. November 2019, 10:51:04 CET schrieb Markus Reichl: >> > >> Working with rootfs on two 128GB mmcs on rk3399-roc-pc. >> > >> >> > >> One (mmc name 128G72, one screw hole) works fine in HS400 mode. >> > >> Other (mmc name DJNB4R, firefly on pcb, two screw holes) gets lots of >> > >> mmc1: "running CQE recovery", even hangs with damaged fs, >> > >> when running under heavy load, e.g. compiling kernel. >> > >> Both run fine with HS200. >> > >> >> > >> Disabling CQ with patch mmc: core: Add MMC Command Queue Support kernel parameter [0] did not help. >> > >> [0] https://gitlab.com/ayufan-repos/rock64/linux-mainline-kernel/commit/54e264154b87dfe32a8359b2726e2d5611adbaf3 >> > > >> > > I'm hoping for some input from other people in Cc but your mail headers >> > > also referenced the drive-impendance series from Christoph [0], which >> > > it seems we need to poke the phy maintainer again. >> > > >> > > Did you check if changing the impedance helped (like the signal dampening >> > > Philipp described in one of the replies there). >> > >> > checked with >> > >> > &emmc_phy { >> > + drive-impedance-ohm = <33>; >> > >> > gives no improvement: >> >> That is sad ... I guess we really should disable hs400 then ... >> that may give others more incentive to dive deeper ;-) > > Just out of curiosity, is the problem with the strobe line, or with > hs400? Have you tried using the solution from "rk3399-gru.dtsi"? > Namely: > > /* > * Signal integrity isn't great at 200 MHz and 150 MHz (DDR) gives the > * same (or nearly the same) performance for all eMMC that are intended > * to be used. > */ > assigned-clock-rates = <150000000>; > > IIRC hs400 on rk3399 was a bit iffy but running at 150 MHz made it > much more reliable and still gave you 300 MB/s transfer rate (so much > better than hs200). In reality many eMMC chips can't do > 300 MB/s > anyway. > I tried 150000000 and 100000000, but it did not help. Gruß, -- Markus > -Doug >
