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Message-ID: <d4e647d8-294c-abd7-40c6-37381796203d@loongson.cn>
Date: Mon, 12 Jun 2023 22:58:54 +0800
From: Sui Jingfeng <suijingfeng@...ngson.cn>
To: Sui Jingfeng <15330273260@....cn>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>, Li Yi <liyi@...ngson.cn>,
Sumit Semwal <sumit.semwal@...aro.org>,
Christian Koenig <christian.koenig@....com>,
Emil Velikov <emil.l.velikov@...il.com>
Cc: Nathan Chancellor <nathan@...nel.org>,
linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
linux-media@...r.kernel.org, linaro-mm-sig@...ts.linaro.org,
loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH v14 0/2] drm: add kms driver for loongson display
controller
Hi,
Any ideas for this trivial DC driver? Sorry about my broken English.
What to do next? Send a new version?
Please Help!
On 2023/5/20 18:57, Sui Jingfeng wrote:
> From: Sui Jingfeng <suijingfeng@...ngson.cn>
>
> Loongson display controller IP has been integrated in both Loongson north
> bridge chipset(ls7a1000/ls7a2000) and Loongson SoCs(ls2k1000/ls2k2000), it
> has been even included in Loongson self-made BMC products.
>
> This display controller is a PCI device. It has two display pipes and each
> display pipe support a primary plane and a cursor plane. For the DC in the
> ls7a1000 and ls2k1000, each display pipe has a DVO output interface which
> provide RGB888 signals, vertical & horizontal synchronisations and pixel
> clock. Each CRTC is able to support 1920x1080@...z, the maximum resolution
> of each display pipe is 2048x2048 according to the hardware spec.
>
> For the DC in LS7A2000, each display pipe is equipped with a built-in HDMI
> encoder which is compliant with the HDMI 1.4 specification, thus it support
> 3840x2160@...z. The first display pipe is also equipped with a transparent
> vga encoder which is parallel with the HDMI encoder. The DC in LS7A2000 is
> more complete compare with the one in old chips, besides above feature, it
> has two hardware cursors, two hardware vblank counter and two scanout
> position recorders unit. It also support tiled framebuffer format which
> can be scanout the tiled framebuffer rendered by the LoongGPU directly.
>
> v1 -> v2:
> 1) Use hpd status reg when polling for ls7a2000
> 2) Fix all warnings emerged when compile with W=1
>
> v2 -> v3:
> 1) Add COMPILE_TEST in Kconfig and make the driver off by default
> 2) Alphabetical sorting headers (Thomas)
> 3) Untangle register access functions as much as possible (Thomas)
> 4) Switch to TTM based memory manager and prefer cached mapping
> for Loongson SoC (Thomas)
> 5) Add chip id detection method, now all models are distinguishable.
> 6) Revise builtin HDMI phy driver, nearly all main stream mode
> below 4K@...z is tested, this driver supported these mode very
> well including clone display mode and extend display mode.
>
> v3 -> v4:
> 1) Quickly fix a small mistake.
>
> v4 -> v5:
> 1) Drop potential support for Loongson 2K series SoC temporary,
> this part should be resend with the DT binding patch in the future.
> 2) Add per display pipe debugfs support to the builtin HDMI encoder.
> 3) Rewrite atomic_update() for hardware cursors plane(Thomas)
> 4) Rewrite encoder and connector initialization part, untangle it
> according to the chip(Thomas).
>
> v5 -> v6:
> 1) Remove stray code which didn't get used, say lsdc_of_get_reserved_ram
> 2) Fix all typos I could found, make sentences and code more readable
> 3) Untangle lsdc_hdmi*_connector_detect() function according to the pipe
> 4) After a serious consideration, we rename this driver as loongson.
> Because we also have drivers toward the LoongGPU IP in LS7A2000 and
> LS2K2000. Besides, there are also drivers about the external encoder,
> HDMI audio driver and vbios support etc. This patch only provide DC
> driver part, my teammate Li Yi believe that loongson will be more
> suitable for loongson graphics than lsdc in the long run.
>
> loongson.ko = LSDC + LoongGPU + encoders driver + vbios/DT ...
>
> v6 -> v7:
> 1) Add prime support, self-sharing is works. sharing buffer with etnaviv
> is also tested, and its works with limitation.
> 2) Implement buffer objects tracking with list_head.
> 3) S3(sleep to RAM) is tested on ls3a5000+ls7a2000 evb and it works.
> 4) Rewrite lsdc_bo_move, since ttm core stop allocating resources
> during BO creation. Patch V1 ~ V6 of this series no longer works
> on latest kernel. Thus, we send V7 to revival them.
>
> v7 -> v8:
> 1) Zero a compile warnnings on 32-bit platform, compile with W=1
> 2) Revise lsdc_bo_gpu_offset() and minor cleanup
> 3) Pageflip tested on the virtual terminal with following commands
>
> modetest -M loongson -s 32:1920x1080 -v
> modetest -M loongson -s 34:1920x1080 -v -F tiles
>
> It works like a charm, when running pageflip test with dual screnn
> configuration, another two additional bo created by the modetest
> emerged, VRAM usage up to 40+MB, well we have at least 64MB, still
> enough.
>
> # cat bos
>
> bo[0000]: size: 8112kB VRAM
> bo[0001]: size: 16kB VRAM
> bo[0002]: size: 16kB VRAM
> bo[0003]: size: 16208kB VRAM
> bo[0004]: size: 8112kB VRAM
> bo[0005]: size: 8112kB VRAM
>
> v8 -> v9:
> 1) Select I2C and I2C_ALGOBIT in Kconfig and should depend on MMU.
> 2) Using pci_get_domain_bus_and_slot to get the GPU device.
> 3) Other minor improvements.
>
> Those patches are tested on ls3a5000 + ls7a1000 CRB, ls3a5000 + ls7a2000
> evb, and lemote a1901 board(ls3a4000 + ls7a1000). On loongson mips CPU,
> the write combine support should be enabled, to get a decent performance
> for writing framebuffer data to the VRAM.
>
> v9 -> v10:
> 1) Revise lsdc_drm_freeze() to implement S3 completely and correctly.
> I suddenly realized that pinned buffer can not move and VRAM lost
> power when sleep to RAM. Thus, the data in the buffer who is pinned
> in VRAM will get lost when resume. Yet it's not big problem because
> we are software rendering solution which relay on the CPU update the
> front framebuffer. We can see the garbage data when resume from S3,
> but the screen will show correct image as I move the cursor. This is
> due to the cpu repaint. v10 of this patch make S3 perfect by unpin
> all of BOs in VRAM, evict them all to system RAM.
>
> v10 -> v11:
> 1) On double screen case, the single giant framebuffer is referenced by
> two GEM object, hence, it will be pinned by prepare_fb() at lease two
> times. This cause its pin count > 1. V10 of this patch only unpin VRAM
> BOs once when suspend, which is not correct on double screen case. V11
> of this patch unpin BOs until its pin count reach to zero when suspend.
> Then, we make the S3 support complete finally. With v11, I can't see
> any garbage data after resume. Tested on both ls7a1000 and ls7a2000
> platform, with single screen and double screen configuration.
> 2) Fix vblank wait timeout when disable CRTC.
> 3) Test against IGT, at least fbdev test and kms_flip test passed.
> 4) Rewrite pixel PLL update function, magic numbers eliminated (Emil)
> 5) Drop a few common hardware features description in lsdc_desc (Emil)
> 6) Drop lsdc_mode_config_mode_valid(), instead add restrictions in dumb
> create function. (Emil)
> 7) Untangle the ls7a1000 case and ls7a2000 case completely (Thomas)
>
> v11 -> v12:
> none
>
> v12 -> v13:
> 1) Add benchmark to figure out the bandwidth of the hardware platform.
> Usage:
> # cd /sys/kernel/debug/dri/0/
> # cat benchmark
>
> 2) VRAM is filled with garbage data if uninitialized, add a buffer
> clearing procedure, clear it on the BO creation time.
> 3) Update copyrights and adjust coding style (Huacai)
>
> v13 -> v14:
> 1) Trying to add async update support for cursor plane.
>
> Sui Jingfeng (2):
> drm: add kms driver for loongson display controller
> MAINTAINERS: add maintainers for DRM LOONGSON driver
>
> MAINTAINERS | 8 +
> drivers/gpu/drm/Kconfig | 2 +
> drivers/gpu/drm/Makefile | 1 +
> drivers/gpu/drm/loongson/Kconfig | 17 +
> drivers/gpu/drm/loongson/Makefile | 20 +
> drivers/gpu/drm/loongson/lsdc_benchmark.c | 133 ++
> drivers/gpu/drm/loongson/lsdc_benchmark.h | 13 +
> drivers/gpu/drm/loongson/lsdc_crtc.c | 1066 +++++++++++++++++
> drivers/gpu/drm/loongson/lsdc_debugfs.c | 91 ++
> drivers/gpu/drm/loongson/lsdc_device.c | 104 ++
> drivers/gpu/drm/loongson/lsdc_drv.c | 495 ++++++++
> drivers/gpu/drm/loongson/lsdc_drv.h | 451 +++++++
> drivers/gpu/drm/loongson/lsdc_gem.c | 324 +++++
> drivers/gpu/drm/loongson/lsdc_gem.h | 37 +
> drivers/gpu/drm/loongson/lsdc_gfxpll.c | 199 +++
> drivers/gpu/drm/loongson/lsdc_gfxpll.h | 52 +
> drivers/gpu/drm/loongson/lsdc_i2c.c | 179 +++
> drivers/gpu/drm/loongson/lsdc_i2c.h | 29 +
> drivers/gpu/drm/loongson/lsdc_irq.c | 71 ++
> drivers/gpu/drm/loongson/lsdc_irq.h | 16 +
> drivers/gpu/drm/loongson/lsdc_output.h | 21 +
> drivers/gpu/drm/loongson/lsdc_output_7a1000.c | 161 +++
> drivers/gpu/drm/loongson/lsdc_output_7a2000.c | 531 ++++++++
> drivers/gpu/drm/loongson/lsdc_pixpll.c | 481 ++++++++
> drivers/gpu/drm/loongson/lsdc_pixpll.h | 86 ++
> drivers/gpu/drm/loongson/lsdc_plane.c | 781 ++++++++++++
> drivers/gpu/drm/loongson/lsdc_probe.c | 56 +
> drivers/gpu/drm/loongson/lsdc_probe.h | 12 +
> drivers/gpu/drm/loongson/lsdc_regs.h | 402 +++++++
> drivers/gpu/drm/loongson/lsdc_ttm.c | 610 ++++++++++
> drivers/gpu/drm/loongson/lsdc_ttm.h | 99 ++
> 31 files changed, 6548 insertions(+)
> create mode 100644 drivers/gpu/drm/loongson/Kconfig
> create mode 100644 drivers/gpu/drm/loongson/Makefile
> create mode 100644 drivers/gpu/drm/loongson/lsdc_benchmark.c
> create mode 100644 drivers/gpu/drm/loongson/lsdc_benchmark.h
> create mode 100644 drivers/gpu/drm/loongson/lsdc_crtc.c
> create mode 100644 drivers/gpu/drm/loongson/lsdc_debugfs.c
> create mode 100644 drivers/gpu/drm/loongson/lsdc_device.c
> create mode 100644 drivers/gpu/drm/loongson/lsdc_drv.c
> create mode 100644 drivers/gpu/drm/loongson/lsdc_drv.h
> create mode 100644 drivers/gpu/drm/loongson/lsdc_gem.c
> create mode 100644 drivers/gpu/drm/loongson/lsdc_gem.h
> create mode 100644 drivers/gpu/drm/loongson/lsdc_gfxpll.c
> create mode 100644 drivers/gpu/drm/loongson/lsdc_gfxpll.h
> create mode 100644 drivers/gpu/drm/loongson/lsdc_i2c.c
> create mode 100644 drivers/gpu/drm/loongson/lsdc_i2c.h
> create mode 100644 drivers/gpu/drm/loongson/lsdc_irq.c
> create mode 100644 drivers/gpu/drm/loongson/lsdc_irq.h
> create mode 100644 drivers/gpu/drm/loongson/lsdc_output.h
> create mode 100644 drivers/gpu/drm/loongson/lsdc_output_7a1000.c
> create mode 100644 drivers/gpu/drm/loongson/lsdc_output_7a2000.c
> create mode 100644 drivers/gpu/drm/loongson/lsdc_pixpll.c
> create mode 100644 drivers/gpu/drm/loongson/lsdc_pixpll.h
> create mode 100644 drivers/gpu/drm/loongson/lsdc_plane.c
> create mode 100644 drivers/gpu/drm/loongson/lsdc_probe.c
> create mode 100644 drivers/gpu/drm/loongson/lsdc_probe.h
> create mode 100644 drivers/gpu/drm/loongson/lsdc_regs.h
> create mode 100644 drivers/gpu/drm/loongson/lsdc_ttm.c
> create mode 100644 drivers/gpu/drm/loongson/lsdc_ttm.h
>
--
Jingfeng
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