Re: [U-Boot] [PATCH 0/2] ARM: tegra: enable GPU DT node

["Andreas Färber" <afaerber-l3A5Bk7waGM@public.gmane.org>]

Salut Alexandre,

Am 09.07.2015 um 09:32 schrieb Alexandre Courbot:
> Tegra124 requires the bootloader to perform VPR initialization, otherwise the
> GPU cannot be used by the system. Since using the GPU without that
> initialization results in a hang, the GPU DT node is left disabled, and it is
> the task of the bootloader to enable it after ensuring it is safe to use the
> GPU.
> 
> VPR init is already performed since patch df3443dfa449, but the device tree was
> left untouched. This patch series performs this last step and prepares the GPU
> intialization code to receive more code for newer chips.

Tested-by: Andreas Färber <afaerber-l3A5Bk7waGM@public.gmane.org>

I've tested this patchset on v2015.07 with 4.2.0-rc3-00115-gc5dfd65 -
with these two patches I get a console login on HDMI again.

However, I'm still having trouble with X11... Should that be working
with linux.git? (haven't tried linux-next.git yet)

Among other errors, it seems that nouveau is looking for firmware
nouveau/nvea_fuc409c and nouveau/fuc409c - who should be providing that?
It's not in linux-firmware.git [1], and I see no /dev/mmcblk0p* to check
whether the original system has such a file (which I doubt, given the
nouveau naming). It then falls back to the tegra drm iiuc.

With -rc2 I've seen the system freeze, with -rc3 just not behaving as
expected when starting X (with ssh/serial remaining usable).

[    2.841626] [drm] Initialized drm 1.1.0 20060810
[    2.846621] 57000000.gpu supply vdd not found, using dummy regulator
[    2.853089] nouveau 57000000.gpu: cannot initialize IOMMU MM
[    2.860518] [drm] not a PCI device; no HDMI
[    2.864814] nouveau  [  DEVICE][57000000.gpu] BOOT0  : 0x0ea000a1
[    2.870932] nouveau  [  DEVICE][57000000.gpu] Chipset: GK20A (NVEA)
[    2.877211] nouveau  [  DEVICE][57000000.gpu] Family : NVE0
[    2.916829] nouveau  [ INSTMEM][57000000.gpu] using DMA API
[    2.923392] nouveau  [    VOLT][57000000.gpu] The default voltage is
-22uV
[    2.930297] nouveau  [     CLK][57000000.gpu] parent clock rate: 12 Mhz
[    2.938662] nouveau  [     CLK][57000000.gpu] --: core 198 MHz
[    3.037837] nouveau  [  PGRAPH][57000000.gpu] using external firmware
[    3.044493] nouveau 57000000.gpu: Direct firmware load for
nouveau/nvea_fuc409c failed with error -2
[    3.053843] nouveau 57000000.gpu: Direct firmware load for
nouveau/fuc409c failed with error -2
[    3.062549] nouveau E[  PGRAPH][57000000.gpu] failed to load fuc409c
[    3.069497] [TTM] Zone  kernel: Available graphics memory: 373624 kiB
[    3.075927] [TTM] Zone highmem: Available graphics memory: 1032568 kiB
[    3.082480] [TTM] Initializing pool allocator
[    3.086923] [TTM] Initializing DMA pool allocator
[    3.091737] nouveau  [     DRM] VRAM: 0 MiB
[    3.095914] nouveau  [     DRM] GART: 1048576 MiB
[    3.191777] nouveau E[   PFIFO][57000000.gpu] unsupported engines
0x00000030
[    3.269831] nouveau E[     DRM] failed to create ce channel, -22
[    3.365874] nouveau E[   PFIFO][57000000.gpu] unsupported engines
0x00000001
[    3.443902] nouveau E[     DRM] failed to create kernel channel, -22
[    3.452322] tegra-hdmi 54280000.hdmi: failed to get HDMI regulator
[...]
[    6.817669] +5V_HDMI_CON: supplied by +5V_SYS
[    6.822215] +1.05V_RUN_AVDD_HDMI_PLL: supplied by +1.05V_RUN
[    6.828102] +3.3V_RUN: supplied by +3.3V_SYS
[    6.832438] +3.3V_AVDD_HDMI_AP_GATED: supplied by +3.3V_RUN
[    6.841657] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    6.848317] [drm] No driver support for vblank timestamp query.
[    6.926989] Console: switching to colour frame buffer device 160x64
[    6.945437] drm drm: fb0:  frame buffer device
[    6.949894] drm drm: registered panic notifier
[    6.976420] [drm] Initialized tegra 0.0.0 20120330 on minor 1

Regards,
Andreas

[1]
https://git.kernel.org/cgit/linux/kernel/git/firmware/linux-firmware.git/tree

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