dudes about new options for amdgpu on kernel 4.15.0

[papu]

i want to know what are this new options on kernel 4.15:

DC support it's about hdmi suport? there are two options one for vega and raven and other for pre vega: polaris, carrizo, tonga, bonaire ,hawaii.

and other and two options on AMD librarry routines , i don't know the utility of that may be not necessary to activate , don't konw.
is there somebody that explain to me?

thanks

i am using amd rx 470(polaris10) that is working nice right now with amdgpu

https://imgur.com/a/huGki

[bridgman]

DC is a newer implementation of the display controller code, with additional features relative to what was upstream previously for Polaris and earlier chips. The older display code was not implemented for Vega/Raven, so DC is enabled by default for those parts and AFAIK will be enabled by default for earlier parts after more testing.

IIRC you can enable DC on your 470 by using the amdgpu.dc=1 boot parameter.

[papu]

DC is a newer implementation of the display controller code, with additional features relative to what was upstream previously for Polaris and earlier chips. The older display code was not implemented for Vega/Raven, so DC is enabled by default for those parts and AFAIK will be enabled by default for earlier parts after more testing.

IIRC you can enable DC on your 470 by using the amdgpu.dc=1 boot parameter.

https://i.imgur.com/cwzDqLe.png

i have it activated on kernel i not see any information in dmesg and neither if write amdgpu.dc=1 in boot parametres.

[bridgman]

i have it activated on kernel i not see any information in dmesg and neither if write amdgpu.dc=1 in boot parametres.

Can you pastebin your dmesg output and put a link here ? If DAL/DC is enabled I think you should see a couple of DAL messages -- or they might only appear with debug level cranked up a bit.

BTW if you rebuild the kernel with the config option changed then you don't need the boot parm - the amdgpu.dc=1 option is there for cases where you did not build the kernel with DC enabled by default on your hardware.

[papu]

dmesg --> http://dpaste.com/0TNQERV


and what about this other two options?

[agd5f]

and what about this other two options?

Just for debugging.

[papu]

Just for debugging.

then i am going to disable them.

[papu]

new dmesg ---> http://dpaste.com/0A05FT1

i activated more options and i see some new stuff like [drm] DM_PPLIB: and [drm] DC: , but i not have idea what are the diference now and before

have i to activate at the same time AMD DC - Enable now display engine and DC support for Polaris and older ASIC's?

thanks

[bridgman]

new dmesg ---> http://dpaste.com/0A05FT1

i activated more options and i see some new stuff like [drm] DM_PPLIB: and [drm] DC: , but i not have idea what are the diference now and before

have i to activate at the same time AMD DC - Enable now display engine and DC support for Polaris and older ASIC's?

The new dmesg looks right. There are some firmware loading error messages in both old and new dmesg output, but they may just be warnings since the ring tests seem to be passing properly.

AFAIK you do need to have both options enabled - DC itself and DC for Polaris & older. If you just enable DC then I believe you only get it for Vega and Raven, where the older code is not available.

[papu]

my amdgpu firmewares are loading fine , but i not understand why the kernel are trying to find firmwares in directorys that not exist in my system
like /lib/firmware/updates or /lib/firmware/4.15.0-gentoo

$ ls -l /lib/firmware/amdgpu/ | grep polaris10
-rw-r--r-- 1 root root   8852 30 gen 20:46 polaris10_ce_2.bin
-rw-r--r-- 1 root root   8832 30 gen 20:46 polaris10_ce.bin
-rw-r--r-- 1 root root 130228 30 gen 20:46 polaris10_k_smc.bin
-rw-r--r-- 1 root root  32708 30 gen 20:46 polaris10_mc.bin
-rw-r--r-- 1 root root  17044 30 gen 20:46 polaris10_me_2.bin
-rw-r--r-- 1 root root  17024 30 gen 20:46 polaris10_me.bin
-rw-r--r-- 1 root root 262824 30 gen 20:46 polaris10_mec2_2.bin
-rw-r--r-- 1 root root 262824 30 gen 20:46 polaris10_mec_2.bin
-rw-r--r-- 1 root root 262784 30 gen 20:46 polaris10_mec2.bin
-rw-r--r-- 1 root root 262784 30 gen 20:46 polaris10_mec.bin
-rw-r--r-- 1 root root  17044 30 gen 20:46 polaris10_pfp_2.bin
-rw-r--r-- 1 root root  17024 30 gen 20:46 polaris10_pfp.bin
-rw-r--r-- 1 root root  23984 30 gen 20:46 polaris10_rlc.bin
-rw-r--r-- 1 root root  12692 30 gen 20:46 polaris10_sdma1.bin
-rw-r--r-- 1 root root  12692 30 gen 20:46 polaris10_sdma.bin
-rw-r--r-- 1 root root 130196 30 gen 20:46 polaris10_smc.bin
-rw-r--r-- 1 root root 130196 30 gen 20:46 polaris10_smc_sk.bin
-rw-r--r-- 1 root root 375424 30 gen 20:46 polaris10_uvd.bin

what does the parametre "[drm] DM_PPLIB:" mean?