00:02 <xdarklight> narmstrong: I tried to move away from meson-gx-pwrc-vpu by implementing two separate power-controller drivers (one for the AO bits, another for the HHI bits) so mjourdan's vdec driver doesn't have to touch the AO bits as well (the GX SoCs have a syscon for the AO registers, but we don't need that on the 32-bit SoCs)

00:02 <xdarklight> so I came up with an initial draft which "kinda" works: https://github.com/xdarklight/linux/commit/9626f239842d44e5efbf4d2d453cbbe57b5eee1f

00:03 <xdarklight> (I'll speak of the Libretech-CC board which I'm using to test this in the following lines...)

00:03 <xdarklight> "works" means: I can access the VPU registers without hanging the board. unfortunately the screen (connected via HDMI) stays black (my monitor says that it doesn't get any signal and thus wants to enter standby)

00:04 <xdarklight> I have compared a few registers with your pwrc driver and with my hack:

00:04 <xdarklight> - AO_RTI_GEN_PWR_SLEEP0 = 0xfffffcff is identical

00:04 <xdarklight> - AO_RTI_GEN_PWR_ISO0 = 0xffffffff is also identical

00:04 <xdarklight> - HHI_MEM_PD_REG0 = 0xffff00f3 is identical

00:05 <xdarklight> - HHI_VPU_MEM_PD_REG0 is 0x55555555 with your driver but 0x00000000 in mine (you're masking off 0x2 instead of 0x3, not sure why)

00:05 <xdarklight> - HHI_VPU_MEM_PD_REG1 - same situation as in HHI_VPU_MEM_PD_REG0

00:06 <xdarklight> before I invest more time in debugging: did you ever run into the situation where you could access the VPU registers but the screen stayed blank while you were developing meson-gx-pwrc-vpu?

01:51 <brads> I seem to have an issue booting or reading sdcard at the moment on Odroid c2, sometimes its detected and sometimes not (both with linux 4.20-rc6 and mainline uboot). At the moment I see "Card never left busy state" in dmesg - https://pastebin.com/hyT4mW9K The emmc works fine and I have triied 3 different sd cards, all with similar issues that were working previously. Trying to work out if its a hardware issue or

01:51 <brads> software maybe?

01:53 <brads> uboot will see the card sometimes and not others on a cold boot (loading bl1), I guess it must be some sort of hardware issue