Hi Stephen, On Mon Jan 20, 2020 at 11:59 AM, Stephen Brennan wrote: > Hi Nicolas, > > You're right, this patch doesn't work (it doesn't even touch the correct > device tree node). My bad. > > > Your UHS class 1 card should work out of the box using the current > > kernel version. > > I've been debugging an issue (reproduced on today's linux-next) in which > my > UHS class 1 card's partitions don't show up in `/dev`. For example, if I > do > `ls /dev | grep mmc`, I get just one result, "mmcblk1". I thought my > patch > fixed the issue, but it turns out that the issue is sporadic: on some > boots, the issue manifests. On others, the partitions appear in /dev as > normal. When I tested this patch, the issue had sporadically > disappeared, > leading me to believe the patch was effective. Have you been playing with different device-trees? notably with the Raspberry Pi foundation ones. Your mmc numbers could change, which might be confusing. If 100% sure it's failing, i.e. nothing happens for the mmc device after seeing: mmc1: SDHCI controller on fe340000.emmc2 [fe340000.emmc2] using ADMA I suggest enabling some extra debug options. Build the kernel with DYNAMIC_DEBUG enabled and add dyndbg="module sdhci +mfp; module mmc_core +mfp" to your kernel command line. It'll be extremely verbose for the working case, but we can compare both and try to find something fishy. Note that I use two UHS class 1 cards myself without issue. > Sorry for the noise! On the contrary, the more we are the better :) Regards, Nicolas
