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2018-08-27drm/ttm: add bulk move function on LRUHuang Rui
This function allow us to bulk move a group of BOs to the tail of their LRU. The positions of group of BOs are stored on the (first, last) bulk_move_pos structure. Signed-off-by: Christian König <christian.koenig@amd.com> Signed-off-by: Huang Rui <ray.huang@amd.com> Tested-by: Mike Lothian <mike@fireburn.co.uk> Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de> Acked-by: Chunming Zhou <david1.zhou@amd.com> Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/ttm: revise ttm_bo_move_to_lru_tail to support bulk movesChristian König
When move a BO to the end of LRU, it need remember the BO positions. Make sure all moved bo in between "first" and "last". And they will be bulk moving together. Signed-off-by: Christian König <christian.koenig@amd.com> Signed-off-by: Huang Rui <ray.huang@amd.com> Tested-by: Mike Lothian <mike@fireburn.co.uk> Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de> Acked-by: Chunming Zhou <david1.zhou@amd.com> Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/ttm: add helper structures for bulk moves on lru listChristian König
Add bulk move pos to store the pointer of first and last buffer object. The list in between will be bulk moved on lru list. Signed-off-by: Christian König <christian.koenig@amd.com> Signed-off-by: Huang Rui <ray.huang@amd.com> Tested-by: Mike Lothian <mike@fireburn.co.uk> Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de> Acked-by: Chunming Zhou <david1.zhou@amd.com> Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: add amdgpu_gmc_pd_addr helperChristian König
Add a helper to get the root PD address and remove the workarounds from the GMC9 code for that. Signed-off-by: Christian König <christian.koenig@amd.com> Acked-by: Felix Kuehling <Felix.Kuehling@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: remove gart.table_addrChristian König
We can easily figure out the address on the fly. Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: rename gart.robj into gart.boChristian König
sed -i "s/gart.robj/gart.bo/" drivers/gpu/drm/amd/amdgpu/*.c sed -i "s/gart.robj/gart.bo/" drivers/gpu/drm/amd/amdgpu/*.h Just cleaning up radeon leftovers. Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Huang Rui <ray.huang@amd.com> Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: move setting the GART addr into TTMChristian König
Move setting the GART addr for window based copies into the TTM code who uses it. Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Huang Rui <ray.huang@amd.com> Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: cleanup VM handling in the CS a bitChristian König
Add a helper function for getting the root PD addr and cleanup join the two VM related functions and cleanup the function name. No functional change. Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Huang Rui <ray.huang@amd.com> Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: validate the VM root PD from the VM codeChristian König
Preparation for following changes. This validates the root PD twice, but the overhead of that should be minimal. Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: cleanup GPU recovery check a bit (v2)Christian König
Check if we should call the function instead of providing the forced flag. v2: rebase on KFD changes (Alex) Signed-off-by: Christian König <christian.koenig@amd.com> Acked-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com> Reviewed-by: Huang Rui <ray.huang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: amdgpu_kiq_reg_write_reg_wait() can be statickbuild test robot
Fixes: d790449835e6 ("drm/amdgpu: use kiq to do invalidate tlb") Reviewed-by: Emily Deng <Emily.Deng@amd.com> Signed-off-by: kbuild test robot <fengguang.wu@intel.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu/display: add support for LVDS (v5)Alex Deucher
This adds support for LVDS displays. v2: add support for spread spectrum, sink detect v3: clean up enable_lvds_output v4: fix up link_detect v5: remove assert on 888 format Bug: https://bugs.freedesktop.org/show_bug.cgi?id=105880 Reviewed-by: Harry Wentland <harry.wentland@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: Don't use kiq in gpu resetEmily Deng
When in gpu reset, don't use kiq, it will generate more TDR. Signed-off-by: Emily Deng <Emily.Deng@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com>. Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/scheduler: avoid redundant shifting of the entity v2Nayan Deshmukh
do not remove entity from the rq if the current rq is from the least loaded scheduler. Signed-off-by: Nayan Deshmukh <nayan26deshmukh@gmail.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amd/display: indent an if statementDan Carpenter
The if statement isn't indented and it makes static checkers complain. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Harry Wentland <harry.wentland@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amd/display: fix a compile warningWen Yang
Fix comile warning like, CC [M] drivers/gpu/drm/i915/gvt/execlist.o CC [M] drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.o CC [M] drivers/gpu/drm/radeon/btc_dpm.o CC [M] drivers/isdn/hisax/avm_a1p.o CC [M] drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_dpp.o drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_hw_sequencer.c: In function ‘dcn10_update_mpcc’: drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_hw_sequencer.c:1903:9: warning: missing braces around initializer [-Wmissing-braces] struct mpcc_blnd_cfg blnd_cfg = {0}; ^ drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_hw_sequencer.c:1903:9: warning: (near initialization for ‘blnd_cfg.black_color’) [-Wmissing-braces] Acked-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Wen Yang <wen.yang99@zte.com.cn> Reviewed-by: Jiang Biao <jiang.biao2@zte.com.cn> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu/sriov: Only sriov runtime support use kiqEmily Deng
For sriov, don't use kiq in exclusive mode, as don't know how long time it will take, some times it will occur exclusive timeout. Signed-off-by: Emily Deng <Emily.Deng@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: fix sdma doorbell range settingEvan Quan
Use the old doorbell range setting until the driver is able to support more sdma queues. Signed-off-by: Evan Quan <evan.quan@amd.com> Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: Fix compile warningRex Zhu
In function ‘gfx_v9_0_check_fw_write_wait’: warning: enumeration value ‘CHIP_TAHITI’ not handled in switch [-Wswitch] Always add default case in case there is no match Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Rex Zhu <Rex.Zhu@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: rework ctx entity creationChristian König
Use a fixed number of entities for each hardware IP. The number of compute entities is reduced to four, SDMA keeps it two entities and all other engines just expose one entity. Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Chunming Zhou <david1.zhou@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: cleanup HW_IP queryChristian König
Move the code into a separate function. Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Chunming Zhou <david1.zhou@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/scheduler: Add stopped flag to drm_sched_entityAndrey Grodzovsky
The flag will prevent another thread from same process to reinsert the entity queue into scheduler's rq after it was already removewd from there by another thread during drm_sched_entity_flush. Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com> Reviewed-by: Chunming Zhou <david1.zhou@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: remove fulll access for suspend phase1Yintian Tao
There is no need for gpu full access for suspend phase1 because under virtualization there is no hw register access for dce block. Signed-off-by: Yintian Tao <yttao@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: use kiq to do invalidate tlbEmily Deng
To avoid the tlb flush not interrupted by world switch, use kiq and one command to do tlb invalidate. v2: Refine the invalidate lock position. Signed-off-by: Emily Deng <Emily.Deng@amd.com> Reviewed-and-Tested-by: Rex Zhu <Rex.Zhu@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: Remove the sriov checking and add firmware checkingEmily Deng
Unify bare metal and sriov, and add firmware checking for reg write and reg wait unify command. Signed-off-by: Emily Deng <Emily.Deng@amd.com> Acked-by: Christian König <christian.koenig@amd.com> Reviewed-and-Tested-by: Rex Zhu <Rex.Zhu@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amd/display: implement DPMS DTN test v2Jun Lei
[why] Existing DTN infrastructure in driver is hacky. It uses implicit log names, and also incorrect escape ID. [how] - Implement using generic DTN escape ID. - Move file logging functionality from driver to to script; driver now outputs to string/buffer - Move HWSS debug functionality to separate c file - Add debug functionalty for per-block logging as CSV - Add pretty print in python Signed-off-by: Jun Lei <Jun.Lei@amd.com> Reviewed-by: Tony Cheng <Tony.Cheng@amd.com> Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amd/display: move edp fast boot optimization flag to streamAnthony Koo
[Why] During S4/S3 stress test it is possible to resume from S4 without calling mode set on eDP, meaning high level optimization flag is not reset. If this is followed by an S3 resume call, driver will see optimization flag is set and consume it and think backend is powered on when in fact it is not. This results in PHY being off in sequence where S4->Resume->S3->Resume->ApplyOpt->black screen. [How] Move optimization flag to stream instead of a DC flag. Signed-off-by: Anthony Koo <Anthony.Koo@amd.com> Reviewed-by: Tony Cheng <Tony.Cheng@amd.com> Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amd/display: Combine dce80 and dce100 i2c hw functionsDavid Francis
[Why] There are two versions of the hw function pointers: one for dce80 and one for all other versions. These paired functions are nearly identical. dce80 and dce100 should not require different i2c access functions. [How] Combine each pair of functions into a single function. Mostly the new functions are based on the dce100 versions as those versions are newer, support more features, and were more maintained. Signed-off-by: David Francis <David.Francis@amd.com> Reviewed-by: Sun peng Li <Sunpeng.Li@amd.com> Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amd/display: Define registers for dcn10Nikola Cornij
Define register for dcn10 for future changes Signed-off-by: Nikola Cornij <nikola.cornij@amd.com> Reviewed-by: Tony Cheng <Tony.Cheng@amd.com> Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amd/display: Program csc matrix as part of stream updateSivapiriyanKumarasamy
Add csc_transform struct to dc_stream_update, and program if set when updating streams Signed-off-by: SivapiriyanKumarasamy <sivapiriyan.kumarasamy@amd.com> Reviewed-by: Anthony Koo <Anthony.Koo@amd.com> Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amd/display: Create new i2c resourceDavid Francis
[Why] I2C code did not match dc resource model and was generally unpleasant [How] Move code into new svelte dce_i2c files, replacing various i2c objects with two structs: dce_i2c_sw and dce_i2c_hw. Fully split sw and hw code paths. Remove all redundant declarations. Use address lists to distinguish between versions. Change dce80 code to newer register access macros. Signed-off-by: David Francis <David.Francis@amd.com> Reviewed-by: Tony Cheng <Tony.Cheng@amd.com> Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/radeon: Do not evict VRAM on APUs with disabled HIBERNATEPaul Menzel
Improve commit d796d844 (drm/radeon/kms: make hibernate work on IGPs) to only migrate VRAM objects if the Linux kernel is actually built with support for hibernation (suspend to disk). Link: https://bugs.freedesktop.org/show_bug.cgi?id=100941 Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: Do not evict VRAM on APUs with disabled HIBERNATEPaul Menzel
Improve commit d796d844 (drm/radeon/kms: make hibernate work on IGPs) to only migrate VRAM objects if the Linux kernel is actually built with support for hibernation (suspend to disk). The better solution is to get the information, if this is suspend or hibernate, from `amdgpu_device_suspend()`, but that’s more involved, so apply the simple solution first. Link: https://bugs.freedesktop.org/show_bug.cgi?id=107277 Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: add status checking after fw is loadedHuang Rui
The status field must be 0 after FW is loaded. Signed-off-by: Huang Rui <ray.huang@amd.com> Acked-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/ttm: remove dead codesHuang Rui
These codes are not used. Signed-off-by: Huang Rui <ray.huang@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: fix VM size reporting on RavenChristian König
Raven doesn't have an VCE block and so also no buggy VCE firmware. Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Reviewed-by: Huang Rui <ray.huang@amd.com> Acked-by: Chunming Zhou <david1.zhou@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: Set clock ungate state when suspend/finiRex Zhu
After set power ungate state, set clock ungate state before when suspend or fini. Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Rex Zhu <Rex.Zhu@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: Set power ungate state when suspend/finiRex Zhu
Unify to set power ungate state at the begin of suspend/fini. Remove the workaround code for gfx off feature in amdgpu_device.c. Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Rex Zhu <Rex.Zhu@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amdgpu: Refine function name and function argsRex Zhu
There are no any logical changes here. 1. change function names: amdgpu_device_ip_late_set_pg/cg_state to amdgpu_device_set_pg/cg_state. 2. add a function argument cg/pg_state, so we can enable/disable cg/pg through those functions Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Rex Zhu <Rex.Zhu@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amd/display: Program gamut remap as part of stream updateSivapiriyanKumarasamy
Add gamut remap to dc_stream_update struct, and program if set when updating streams. Signed-off-by: SivapiriyanKumarasamy <sivapiriyan.kumarasamy@amd.com> Reviewed-by: Anthony Koo <Anthony.Koo@amd.com> Acked-by: Leo Li <sunpeng.li@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amd/display: HDR dynamic meta should be treated as stream updateKrunoslav Kovac
[Why] Recently we fixed HDR static meta using AFMT registers to be treated as fast stream update. Dynamic meta is still being treated as (full) surface update because it touches HUBP and it travels with pipe data. Here we change it to be (fast) stream update. Note, originally we also wanted to redesign here a bit, but without OS level support for true dynamic meta, it's left the same. We are simply using HW that can do dynamic meta to send HDR static meta, I still prefer keeping it in one static meta type then defining dynamic meta types to hold the same info. Once we know how OS interfaces look like, we can do proper design. [How] Move dyn meta update from update_hubp_dpp to commit_planes_do_stream_update Signed-off-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com> Reviewed-by: Tony Cheng <Tony.Cheng@amd.com> Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amd/display: Handle HDR meta update as fast updateKrunoslav Kovac
[Why] Vesa DPMS tool sends different HDR meta in OS flips without changing output parameters. We don't properly update HDR info frame: - we label HDR meta update as fast update - when updating HW info frame, we only do it if full update [How] It should still be fast update, so when doing HW infoframe update, do it always no matter the update type. Also, don't request passive flip for HDR meta update only without output transfer function or color space changed. Signed-off-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com> Reviewed-by: Tony Cheng <Tony.Cheng@amd.com> Acked-by: Leo Li <sunpeng.li@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amd/display: Program vsc_infopacket in commit_planes_for_streamAlvin lee
Signed-off-by: Alvin lee <alvin.lee3@amd.com> Reviewed-by: Jun Lei <Jun.Lei@amd.com> Acked-by: Harry Wentland <harry.wentland@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amd/display: Enable Stereo in Dal3Alvin lee
- program infoframe for Stereo - program stereo flip control registers properly v2: Add missing license headers Signed-off-by: Alvin lee <alvin.lee3@amd.com> Reviewed-by: Tony Cheng <Tony.Cheng@amd.com> Acked-by: Harry Wentland <harry.wentland@amd.com> Acked-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amd/display: Program vline interrupt on FAST updateSivapiriyanKumarasamy
Signed-off-by: SivapiriyanKumarasamy <sivapiriyan.kumarasamy@amd.com> Reviewed-by: Tony Cheng <Tony.Cheng@amd.com> Reviewed-by: Anthony Koo <Anthony.Koo@amd.com> Acked-by: Harry Wentland <harry.wentland@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amd/display: decouple front and backend pgm using dpms_off as backend ↵Samson Tam
enable flag Signed-off-by: Samson Tam <Samson.Tam@amd.com> Reviewed-by: Anthony Koo <Anthony.Koo@amd.com> Acked-by: Harry Wentland <harry.wentland@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amd/display: add config for sending VSIFAnthony Koo
Signed-off-by: Anthony Koo <Anthony.Koo@amd.com> Reviewed-by: Aric Cyr <Aric.Cyr@amd.com> Acked-by: Harry Wentland <harry.wentland@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amd/display: Don't force UPDATE_TYPE_FULL if stream_update has ↵Harry Wentland
hdr_static_metadata This was missed when pushing public patch for 3e3a40b03847 (drm/amd/display: Updated HDR Static Metadata to directly take info packet raw) This is currently no problem yet since we're not doing HDR on Linux yet. Signed-off-by: Harry Wentland <harry.wentland@amd.com> Acked-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amd/display: Correct rounding calcs in mod_freesync_is_valid_rangeAnthony Koo
Signed-off-by: Anthony Koo <Anthony.Koo@amd.com> Reviewed-by: Aric Cyr <Aric.Cyr@amd.com> Acked-by: Harry Wentland <harry.wentland@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-08-27drm/amd/display: refactor vupdate interrupt registrationAnthony Koo
We only need to register once OS calls the interrupt control. Also, if we are entering static screen mode, disable after ramping is done. Disable shall be done via timer of 2 seconds regardless of ramping complete or not, just to simplify. Also, ramp to mid instead of min, due to better flicker performance... Signed-off-by: Anthony Koo <Anthony.Koo@amd.com> Reviewed-by: Aric Cyr <Aric.Cyr@amd.com> Acked-by: Harry Wentland <harry.wentland@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>