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[Why] Documentation is helpful for the community to understand our code. This change does some high-level documentation of some DM interfaces with DRM, and the amdgpu base driver. [How] An entry for AMDgpu DC has been added to Documentation/gpu/drivers.rst TOC. amdgpu-dc.rst is created to pull in inline doc-strings, which: - Provides an overview for "What is DM?" - Documents AMDgpu DM lifecyle - Documents IRQ management - Documents atomic_check and commit_tail interfaces Signed-off-by: Leo Li <sunpeng.li@amd.com> Reviewed-by: David Francis <David.Francis@amd.com> Acked-by: Leo Li <sunpeng.li@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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===================================
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drm/amd/display - Display Core (DC)
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===================================
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*placeholder - general description of supported platforms, what dc is, etc.*
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Because it is partially shared with other operating systems, the Display Core
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Driver is divided in two pieces.
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1. **Display Core (DC)** contains the OS-agnostic components. Things like
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hardware programming and resource management are handled here.
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2. **Display Manager (DM)** contains the OS-dependent components. Hooks to the
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amdgpu base driver and DRM are implemented here.
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It doesn't help that the entire package is frequently referred to as DC. But
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with the context in mind, it should be clear.
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When CONFIG_DRM_AMD_DC is enabled, DC will be initialized by default for
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supported ASICs. To force disable, set `amdgpu.dc=0` on kernel command line.
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Likewise, to force enable on unsupported ASICs, set `amdgpu.dc=1`.
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To determine if DC is loaded, search dmesg for the following entry:
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``Display Core initialized with <version number here>``
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AMDgpu Display Manager
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======================
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.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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:doc: overview
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.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
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:internal:
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Lifecycle
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---------
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.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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:doc: DM Lifecycle
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.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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:functions: dm_hw_init dm_hw_fini
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Interrupts
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----------
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.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
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:doc: overview
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.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
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:internal:
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.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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:functions: register_hpd_handlers dm_crtc_high_irq dm_pflip_high_irq
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Atomic Implementation
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---------------------
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.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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:doc: atomic
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.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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:functions: amdgpu_dm_atomic_check amdgpu_dm_atomic_commit_tail
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Display Core
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============
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**WIP**
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