On Wed, 10 May 2023 at 22:54, Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx> wrote: > > Hi Ulf, > > On Wed, May 10, 2023 at 4:21 PM Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote: > [...] > > Thanks for reporting - and my apologies for the long delay! It's been > > a busy period with lots of travelling for me. > Thank you for taking the time to look into this now - no need to apologize! > > [...] > > > In this state I get: > > > # cat /sys/kernel/debug/mmc1/ios > > > clock: 52000000 Hz > > > actual clock: 51000000 Hz > > > vdd: 21 (3.3 ~ 3.4 V) > > > bus mode: 2 (push-pull) > > > chip select: 0 (don't care) > > > power mode: 2 (on) > > > bus width: 3 (8 bits) > > > timing spec: 9 (mmc HS200) > > > signal voltage: 1 (1.80 V) > > > driver type: 0 (driver type B) > > > > It looks to me that we are in the process of enabling the HS200 mode, > > but hangs at some point. Unless I am mistaken. > > > > More precisely, I suspect it's either the call to mmc_set_clock() or > > the call to mmc_switch_status(), in mmc_select_hs200(). Can you have a > > closer look to confirm this? > Indeed, removing mmc_set_clock() from mmc_select_hs200() also makes my > eMMC appear again on top of Linux 6.4-rc1. > See the attached diff in case it's not fully clear which > mmc_set_clock() call I removed. Thanks for the update! Removing that call restores mmc_select_hs200() to the previous behaviour - so thanks for confirming that this is working. However, to find the proper solution, I think we need to understand why we are hanging in the meson-mx-sdhc driver first. Here's a couple of follow up questions from me: 1) Before calling mmc_set_clock() what is the actual clock rate that has been set by the meson driver? 2) Does the call to mmc_set_clock() return or hang? Can we verify that the clock gets set correctly? 3) If 2) seems to work above, we need to figure out why mmc_switch_status() is hanging. If there is a problem with the eMMC card responding in-correctly, the host driver should return with an error code, right? Kind regards Uffe
