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authorLinus Torvalds <torvalds@linux-foundation.org>2024-03-13 18:34:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2024-03-13 18:34:05 -0700
commit480e035fc4c714fb5536e64ab9db04fedc89e910 (patch)
tree01341ee43abe7ecb8efb4e7bbbb1c3b3b50f7ec8 /Documentation/gpu/amdgpu/display
parente5e038b7ae9da96b93974bf072ca1876899a01a3 (diff)
parent119b225f01e4d3ce974cd3b4d982c76a380c796d (diff)
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Merge tag 'drm-next-2024-03-13' of https://gitlab.freedesktop.org/drm/kernel
Pull drm updates from Dave Airlie: "Highlights are usual, more AMD IP blocks for future hw, i915/xe changes, Displayport tunnelling support for i915, msm YUV over DP changes, new tests for ttm, but its mostly a lot of stuff all over the place from lots of people. core: - EDID cleanups - scheduler error handling fixes - managed: add drmm_release_action() with tests - add ratelimited drm debug print - DPCD PSR early transport macro - DP tunneling and bandwidth allocation helpers - remove built-in edids - dp: Avoid AUX transfers on powered-down displays - dp: Add VSC SDP helpers cross drivers: - use new drm print helpers - switch to ->read_edid callback - gem: add stats for shared buffers plus updates to amdgpu, i915, xe syncobj: - fixes to waiting and sleeping ttm: - add tests - fix errno codes - simply busy-placement handling - fix page decryption media: - tc358743: fix v4l device registration video: - move all kernel parameters for video behind CONFIG_VIDEO sound: - remove <drm/drm_edid.h> include from header ci: - add tests for msm - fix apq8016 runner efifb: - use copy of global screen_info state vesafb: - use copy of global screen_info state simplefb: - fix logging bridge: - ite-6505: fix DP link-training bug - samsung-dsim: fix error checking in probe - samsung-dsim: add bsh-smm-s2/pro boards - tc358767: fix regmap usage - imx: add i.MX8MP HDMI PVI plus DT bindings - imx: add i.MX8MP HDMI TX plus DT bindings - sii902x: fix probing and unregistration - tc358767: limit pixel PLL input range - switch to new drm_bridge_read_edid() interface panel: - ltk050h3146w: error-handling fixes - panel-edp: support delay between power-on and enable; use put_sync in unprepare; support Mediatek MT8173 Chromebooks, BOE NV116WHM-N49 V8.0, BOE NV122WUM-N41, CSO MNC207QS1-1 plus DT bindings - panel-lvds: support EDT ETML0700Z9NDHA plus DT bindings - panel-novatek: FRIDA FRD400B25025-A-CTK plus DT bindings - add BOE TH101MB31IG002-28A plus DT bindings - add EDT ETML1010G3DRA plus DT bindings - add Novatek NT36672E LCD DSI plus DT bindings - nt36523: support 120Hz timings, fix includes - simple: fix display timings on RK32FN48H - visionox-vtdr6130: fix initialization - add Powkiddy RGB10MAX3 plus DT bindings - st7703: support panel rotation plus DT bindings - add Himax HX83112A plus DT bindings - ltk500hd1829: add support for ltk101b4029w and admatec 9904370 - simple: add BOE BP082WX1-100 8.2" panel plus DT bindungs panel-orientation-quirks: - GPD Win Mini amdgpu: - Validate DMABuf imports in compute VMs - Add RAS ACA framework - PSP 13 fixes - Misc code cleanups - Replay fixes - Atom interpretor PS, WS bounds checking - DML2 fixes - Audio fixes - DCN 3.5 Z state fixes - Remove deprecated ida_simple usage - UBSAN fixes - RAS fixes - Enable seq64 infrastructure - DC color block enablement - Documentation updates - DC documentation updates - DMCUB updates - ATHUB 4.1 support - LSDMA 7.0 support - JPEG DPG support - IH 7.0 support - HDP 7.0 support - VCN 5.0 support - SMU 13.0.6 updates - NBIO 7.11 updates - SDMA 6.1 updates - MMHUB 3.3 updates - DCN 3.5.1 support - NBIF 6.3.1 support - VPE 6.1.1 support amdkfd: - Validate DMABuf imports in compute VMs - SVM fixes - Trap handler updates and enhancements - Fix cache size reporting - Relocate the trap handler radeon: - Atom interpretor PS, WS bounds checking - Misc code cleanups xe: - new query for GuC submission version - Remove unused persistent exec_queues - Add vram frequency sysfs attributes - Add the flag XE_VM_BIND_FLAG_DUMPABLE - Drop pre-production workarounds - Drop kunit tests for unsupported platforms - Start pumbling SR-IOV support with memory based interrupts for VF - Allow to map BO in GGTT with PAT index corresponding to XE_CACHE_UC to work with memory based interrupts - Add GuC Doorbells Manager as prep work SR-IOV - Implement additional workarounds for xe2 and MTL - Program a few registers according to perfomance guide spec for Xe2 - Fix remaining 32b build issues and enable it back - Fix build with CONFIG_DEBUG_FS=n - Fix warnings from GuC ABI headers - Introduce Relay Communication for SR-IOV for VF <-> GuC <-> PF - Release mmap mappings on rpm suspend - Disable mid-thread preemption when not properly supported by hardware - Fix xe_exec by reserving extra fence slot for CPU bind - Fix xe_exec with full long running exec queue - Canonicalize addresses where needed for Xe2 and add to devcoredum - Toggle USM support for Xe2 - Only allow 1 ufence per exec / bind IOCTL - Add GuC firmware loading for Lunar Lake - Add XE_VMA_PTE_64K VMA flag i915: - Add more ADL-N PCI IDs - Enable fastboot also on older platforms - Early transport for panel replay and PSR - New ARL PCI IDs - DP TPS4 PHY test pattern support - Unify and improve VSC SDP for PSR and non-PSR cases - Refactor memory regions and improve debug logging - Rework global state serialization - Remove unused CDCLK divider fields - Unify HDCP connector logging format - Use display instead of graphics version in display code - Move VBT and opregion debugfs next to the implementation - Abstract opregion interface, use opaque type - MTL fixes - HPD handling fixes - Add GuC submission interface version query - Atomically invalidate userptr on mmu-notifier - Update handling of MMIO triggered reports - Don't make assumptions about intel_wakeref_t type - Extend driver code of Xe_LPG to Xe_LPG+ - Add flex arrays to struct i915_syncmap - Allow for very slow HuC loading - DP tunneling and bandwidth allocation support msm: - Correct bindings for MSM8976 and SM8650 platforms - Start migration of MDP5 platforms to DPU driver - X1E80100 MDSS support - DPU: - Improve DSC allocation, fixing several important corner cases - Add support for SDM630/SDM660 platforms - Simplify dpu_encoder_phys_ops - Apply fixes targeting DSC support with a single DSC encoder - Apply fixes for HCTL_EN timing configuration - X1E80100 support - Add support for YUV420 over DP - GPU: - fix sc7180 UBWC config - fix a7xx LLC config - new gpu support: a305B, a750, a702 - machine support: SM7150 (different power levels than other a618) - a7xx devcoredump support habanalabs: - configure IRQ affinity according to NUMA node - move HBM MMU page tables inside the HBM - improve device reset - check extended PCIe errors ivpu: - updates to firmware API - refactor BO allocation imx: - use devm_ functions during init hisilicon: - fix EDID includes mgag200: - improve ioremap usage - convert to struct drm_edid - Work around PCI write bursts nouveau: - disp: use kmemdup() - fix EDID includes - documentation fixes qaic: - fixes to BO handling - make use of DRM managed release - fix order of remove operations rockchip: - analogix_dp: get encoder port from DT - inno_hdmi: support HDMI for RK3128 - lvds: error-handling fixes ssd130x: - support SSD133x plus DT bindings tegra: - fix error handling tilcdc: - make use of DRM managed release v3d: - show memory stats in debugfs - Support display MMU page size vc4: - fix error handling in plane prepare_fb - fix framebuffer test in plane helpers virtio: - add venus capset defines vkms: - fix OOB access when programming the LUT - Kconfig improvements vmwgfx: - unmap surface before changing plane state - fix memory leak in error handling - documentation fixes - list command SVGA_3D_CMD_DEFINE_GB_SURFACE_V4 as invalid - fix null-pointer deref in execbuf - refactor display-mode probing - fix fencing for creating cursor MOBs - fix cursor-memory lifetime xlnx: - fix live video input for ZynqMP DPSUB lima: - fix memory leak loongson: - fail if no VRAM present meson: - switch to new drm_bridge_read_edid() interface renesas: - add RZ/G2L DU support plus DT bindings mxsfb: - Use managed mode config sun4i: - HDMI: updates to atomic mode setting mediatek: - Add display driver for MT8188 VDOSYS1 - DSI driver cleanups - Filter modes according to hardware capability - Fix a null pointer crash in mtk_drm_crtc_finish_page_flip etnaviv: - enhancements for NPU and MRT support" * tag 'drm-next-2024-03-13' of https://gitlab.freedesktop.org/drm/kernel: (1420 commits) drm/amd/display: Removed redundant @ symbol to fix kernel-doc warnings in -next repo drm/amd/pm: wait for completion of the EnableGfxImu message drm/amdgpu/soc21: add mode2 asic reset for SMU IP v14.0.1 drm/amdgpu: add smu 14.0.1 support drm/amdgpu: add VPE 6.1.1 discovery support drm/amdgpu/vpe: add VPE 6.1.1 support drm/amdgpu/vpe: don't emit cond exec command under collaborate mode drm/amdgpu/vpe: add collaborate mode support for VPE drm/amdgpu/vpe: add PRED_EXE and COLLAB_SYNC OPCODE drm/amdgpu/vpe: add multi instance VPE support drm/amdgpu/discovery: add nbif v6_3_1 ip block drm/amdgpu: Add nbif v6_3_1 ip block support drm/amdgpu: Add pcie v6_1_0 ip headers (v5) drm/amdgpu: Add nbif v6_3_1 ip headers (v5) arch/powerpc: Remove <linux/fb.h> from backlight code macintosh/via-pmu-backlight: Include <linux/backlight.h> fbdev/chipsfb: Include <linux/backlight.h> drm/etnaviv: Restore some id values drm/amdkfd: make kfd_class constant drm/amdgpu: add ring timeout information in devcoredump ...
Diffstat (limited to 'Documentation/gpu/amdgpu/display')
-rw-r--r--Documentation/gpu/amdgpu/display/dcn-blocks.rst78
-rw-r--r--Documentation/gpu/amdgpu/display/display-contributing.rst168
-rw-r--r--Documentation/gpu/amdgpu/display/display-manager.rst3
-rw-r--r--Documentation/gpu/amdgpu/display/index.rst78
4 files changed, 317 insertions, 10 deletions
diff --git a/Documentation/gpu/amdgpu/display/dcn-blocks.rst b/Documentation/gpu/amdgpu/display/dcn-blocks.rst
new file mode 100644
index 000000000000..a3fbd3ea028b
--- /dev/null
+++ b/Documentation/gpu/amdgpu/display/dcn-blocks.rst
@@ -0,0 +1,78 @@
+==========
+DCN Blocks
+==========
+
+In this section, you will find some extra details about some of the DCN blocks
+and the code documentation when it is automatically generated.
+
+DCHUBBUB
+--------
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/hubp.h
+ :doc: overview
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/hubp.h
+ :export:
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/hubp.h
+ :internal:
+
+HUBP
+----
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/hubp.h
+ :doc: overview
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/hubp.h
+ :export:
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/hubp.h
+ :internal:
+
+DPP
+---
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/hubp.h
+ :doc: overview
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/hubp.h
+ :export:
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/hubp.h
+ :internal:
+
+MPC
+---
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/mpc.h
+ :doc: overview
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/mpc.h
+ :export:
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/mpc.h
+ :internal:
+
+OPP
+---
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/opp.h
+ :doc: overview
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/opp.h
+ :export:
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/opp.h
+ :internal:
+
+DIO
+---
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_dio.h
+ :doc: overview
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_dio.h
+ :export:
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_dio.h
+ :internal:
diff --git a/Documentation/gpu/amdgpu/display/display-contributing.rst b/Documentation/gpu/amdgpu/display/display-contributing.rst
new file mode 100644
index 000000000000..fdb2bea01d53
--- /dev/null
+++ b/Documentation/gpu/amdgpu/display/display-contributing.rst
@@ -0,0 +1,168 @@
+.. _display_todos:
+
+==============================
+AMDGPU - Display Contributions
+==============================
+
+First of all, if you are here, you probably want to give some technical
+contribution to the display code, and for that, we say thank you :)
+
+This page summarizes some of the issues you can help with; keep in mind that
+this is a static page, and it is always a good idea to try to reach developers
+in the amdgfx or some of the maintainers. Finally, this page follows the DRM
+way of creating a TODO list; for more information, check
+'Documentation/gpu/todo.rst'.
+
+Gitlab issues
+=============
+
+Users can report issues associated with AMD GPUs at:
+
+- https://gitlab.freedesktop.org/drm/amd
+
+Usually, we try to add a proper label to all new tickets to make it easy to
+filter issues. If you can reproduce any problem, you could help by adding more
+information or fixing the issue.
+
+Level: diverse
+
+IGT
+===
+
+`IGT`_ provides many integration tests that can be run on your GPU. We always
+want to pass a large set of tests to increase the test coverage in our CI. If
+you wish to contribute to the display code but are unsure where a good place
+is, we recommend you run all IGT tests and try to fix any failure you see in
+your hardware. Keep in mind that this failure can be an IGT problem or a kernel
+issue; it is necessary to analyze case-by-case.
+
+Level: diverse
+
+.. _IGT: https://gitlab.freedesktop.org/drm/igt-gpu-tools
+
+Compilation
+===========
+
+Fix compilation warnings
+------------------------
+
+Enable the W1 or W2 warning level in the kernel compilation and try to fix the
+issues on the display side.
+
+Level: Starter
+
+Fix compilation issues when using um architecture
+-------------------------------------------------
+
+Linux has a User-mode Linux (UML) feature, and the kernel can be compiled to
+the **um** architecture. Compiling for **um** can bring multiple advantages
+from the test perspective. We currently have some compilation issues in this
+area that we need to fix.
+
+Level: Intermediate
+
+Code Refactor
+=============
+
+Add prefix to DC functions to improve the debug with ftrace
+-----------------------------------------------------------
+
+The Ftrace debug feature (check 'Documentation/trace/ftrace.rst') is a
+fantastic way to check the code path when developers try to make sense of a
+bug. Ftrace provides a filter mechanism that can be useful when the developer
+has some hunch of which part of the code can cause the issue; for this reason,
+if a set of functions has a proper prefix, it becomes easy to create a good
+filter. Additionally, prefixes can improve stack trace readability.
+
+The DC code does not follow some prefix rules, which makes the Ftrace filter
+more complicated and reduces the readability of the stack trace. If you want
+something simple to start contributing to the display, you can make patches for
+adding prefixes to DC functions. To create those prefixes, use part of the file
+name as a prefix for all functions in the target file. Check the
+'amdgpu_dm_crtc.c` and `amdgpu_dm_plane.c` for some references. However, we
+strongly advise not to send huge patches changing these prefixes; otherwise, it
+will be hard to review and test, which can generate second thoughts from
+maintainers. Try small steps; in case of double, you can ask before you put in
+effort. We recommend first looking at folders like dceXYZ, dcnXYZ, basics,
+bios, core, clk_mgr, hwss, resource, and irq.
+
+Level: Starter
+
+Reduce code duplication
+-----------------------
+
+AMD has an extensive portfolio with various dGPUs and APUs that amdgpu
+supports. To maintain the new hardware release cadence, DCE/DCN was designed in
+a modular design, making the bring-up for new hardware fast. Over the years,
+amdgpu accumulated some technical debt in the code duplication area. For this
+task, it would be a good idea to find a tool that can discover code duplication
+(including patterns) and use it as guidance to reduce duplications.
+
+Level: Intermediate
+
+Make atomic_commit_[check|tail] more readable
+---------------------------------------------
+
+The functions responsible for atomic commit and tail are intricate and
+extensive. In particular `amdgpu_dm_atomic_commit_tail` is a long function and
+could benefit from being split into smaller helpers. Improvements in this area
+are more than welcome, but keep in mind that changes in this area will affect
+all ASICs, meaning that refactoring requires a comprehensive verification; in
+other words, this effort can take some time for validation.
+
+Level: Advanced
+
+Documentation
+=============
+
+Expand kernel-doc
+-----------------
+
+Many DC functions do not have a proper kernel-doc; understanding a function and
+adding documentation is a great way to learn more about the amdgpu driver and
+also leave an outstanding contribution to the entire community.
+
+Level: Starter
+
+Beyond AMDGPU
+=============
+
+AMDGPU provides features that are not yet enabled in the userspace. This
+section highlights some of the coolest display features, which could be enabled
+with the userspace developer helper.
+
+Enable underlay
+---------------
+
+AMD display has this feature called underlay (which you can read more about at
+'Documentation/GPU/amdgpu/display/mpo-overview.rst') which is intended to
+save power when playing a video. The basic idea is to put a video in the
+underlay plane at the bottom and the desktop in the plane above it with a hole
+in the video area. This feature is enabled in ChromeOS, and from our data
+measurement, it can save power.
+
+Level: Unknown
+
+Adaptive Backlight Modulation (ABM)
+-----------------------------------
+
+ABM is a feature that adjusts the display panel's backlight level and pixel
+values depending on the displayed image. This power-saving feature can be very
+useful when the system starts to run off battery; since this will impact the
+display output fidelity, it would be good if this option was something that
+users could turn on or off.
+
+Level: Unknown
+
+
+HDR & Color management & VRR
+----------------------------
+
+HDR, Color Management, and VRR are huge topics and it's hard to put these into
+concise ToDos. If you are interested in this topic, we recommend checking some
+blog posts from the community developers to better understand some of the
+specific challenges and people working on the subject. If anyone wants to work
+on some particular part, we can try to help with some basic guidance. Finally,
+keep in mind that we already have some kernel-doc in place for those areas.
+
+Level: Unknown
diff --git a/Documentation/gpu/amdgpu/display/display-manager.rst b/Documentation/gpu/amdgpu/display/display-manager.rst
index be2651ecdd7f..67a811e6891f 100644
--- a/Documentation/gpu/amdgpu/display/display-manager.rst
+++ b/Documentation/gpu/amdgpu/display/display-manager.rst
@@ -132,9 +132,6 @@ The DRM blend mode and its elements are then mapped by AMDGPU display manager
(MPC), as follows:
.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/mpc.h
- :doc: mpc-overview
-
-.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/mpc.h
:functions: mpcc_blnd_cfg
Therefore, the blending configuration for a single MPCC instance on the MPC
diff --git a/Documentation/gpu/amdgpu/display/index.rst b/Documentation/gpu/amdgpu/display/index.rst
index f8a4f53d70d8..f0c342e00a39 100644
--- a/Documentation/gpu/amdgpu/display/index.rst
+++ b/Documentation/gpu/amdgpu/display/index.rst
@@ -7,18 +7,80 @@ drm/amd/display - Display Core (DC)
AMD display engine is partially shared with other operating systems; for this
reason, our Display Core Driver is divided into two pieces:
-1. **Display Core (DC)** contains the OS-agnostic components. Things like
+#. **Display Core (DC)** contains the OS-agnostic components. Things like
hardware programming and resource management are handled here.
-2. **Display Manager (DM)** contains the OS-dependent components. Hooks to the
- amdgpu base driver and DRM are implemented here.
+#. **Display Manager (DM)** contains the OS-dependent components. Hooks to the
+ amdgpu base driver and DRM are implemented here. For example, you can check
+ display/amdgpu_dm/ folder.
+
+------------------
+DC Code validation
+------------------
+
+Maintaining the same code base across multiple OSes requires a lot of
+synchronization effort between repositories and exhaustive validation. In the
+DC case, we maintain a tree to centralize code from different parts. The shared
+repository has integration tests with our Internal Linux CI farm, and we run a
+comprehensive set of IGT tests in various AMD GPUs/APUs (mostly recent dGPUs
+and APUs). Our CI also checks ARM64/32, PPC64/32, and x86_64/32 compilation
+with DCN enabled and disabled.
+
+When we upstream a new feature or some patches, we pack them in a patchset with
+the prefix **DC Patches for <DATE>**, which is created based on the latest
+`amd-staging-drm-next <https://gitlab.freedesktop.org/agd5f/linux>`_. All of
+those patches are under a DC version tested as follows:
+
+* Ensure that every patch compiles and the entire series pass our set of IGT
+ test in different hardware.
+* Prepare a branch with those patches for our validation team. If there is an
+ error, a developer will debug as fast as possible; usually, a simple bisect
+ in the series is enough to point to a bad change, and two possible actions
+ emerge: fix the issue or drop the patch. If it is not an easy fix, the bad
+ patch is dropped.
+* Finally, developers wait a few days for community feedback before we merge
+ the series.
+
+It is good to stress that the test phase is something that we take extremely
+seriously, and we never merge anything that fails our validation. Follows an
+overview of our test set:
+
+#. Manual test
+ * Multiple Hotplugs with DP and HDMI.
+ * Stress test with multiple display configuration changes via the user interface.
+ * Validate VRR behaviour.
+ * Check PSR.
+ * Validate MPO when playing video.
+ * Test more than two displays connected at the same time.
+ * Check suspend/resume.
+ * Validate FPO.
+ * Check MST.
+#. Automated test
+ * IGT tests in a farm with GPUs and APUs that support DCN and DCE.
+ * Compilation validation with the latest GCC and Clang from LTS distro.
+ * Cross-compilation for PowerPC 64/32, ARM 64/32, and x86 32.
+
+In terms of test setup for CI and manual tests, we usually use:
+
+#. The latest Ubuntu LTS.
+#. In terms of userspace, we only use fully updated open-source components
+ provided by the distribution official package manager.
+#. Regarding IGT, we use the latest code from the upstream.
+#. Most of the manual tests are conducted in the GNome but we also use KDE.
+
+Notice that someone from our test team will always reply to the cover letter
+with the test report.
+
+--------------
+DC Information
+--------------
The display pipe is responsible for "scanning out" a rendered frame from the
GPU memory (also called VRAM, FrameBuffer, etc.) to a display. In other words,
it would:
-1. Read frame information from memory;
-2. Perform required transformation;
-3. Send pixel data to sink devices.
+#. Read frame information from memory;
+#. Perform required transformation;
+#. Send pixel data to sink devices.
If you want to learn more about our driver details, take a look at the below
table of content:
@@ -26,7 +88,9 @@ table of content:
.. toctree::
display-manager.rst
- dc-debug.rst
dcn-overview.rst
+ dcn-blocks.rst
mpo-overview.rst
+ dc-debug.rst
+ display-contributing.rst
dc-glossary.rst