Disclaimer: This code is WIP, not even ready for review. If you have no interest in Exynos DRM, don't waste your time to read it. 1. why share this ugly code? This patch is to share and discuss the necessary parts for recent upstream of exynos dpu_dma, dpp[1] Please don't look Patch 2-7, this is just proof that dpu_dma, dpp works. (Also has build break!) Also, since I don't have much experience in Linux kernel yet, I thought it's better to share before going too wrong direction. This patch is a code that successfully boots, modetest and drm from the latest v6.12-rc1 base. [1] https://lore.kernel.org/linux-samsung-soc/2e4d3d180f535e57d9cb98e7bac1d14b51ffc5d4.camel@xxxxxxxxx/ 2. some want to help or discuss -Naming problem Q: What is best naming for files and Kconfig var? As-is : exynos9_decon.c exynos_dpp.c exynos_dpu_dma.c For DMA, there already exists an exynos_drm_dma.c, so I named it as 'dpu_dma' according to the IP manual. But I'm considering make prefix 'exynosautov9_drm' for all or 'exynos_dpu'. -DECON interface Q: dpp_update(), dpu_dma_update() function are looks ok? Origin vendor code split each channel to comaptible data(dma_fg0, dma_g0, ...) using binding. Problem is Exynos850 or each SOC has own dma,dpp wiring. (e.g. some Exynos850 is not wiring with dma <-> dpp. they just dma <-> decon) So I changed it to code level that decon call register setting function. Decon will control dpp, dma based on channel parameter using dpp_update(), dpu_dma_update() function -DP I'm not familiar with almost all parts of DP. If someone is interested in Exynos DP, any advice would be appreciated. 3. About exynosv9 arhitecture In the case of the existing DRM 5 series, DECON played a role as CRTC and sent data to the panel. I don't know about the DRM 7 series, but the Exynos 8 and auto9 series have DECON divided into three areas: DMA, DPP, and DECON, to started supporting more channels and formats. Exynos auto v9 has DPU_DMA - reads the image data from external memory, converts the image into pixels, and transfers them to remaining display processing pipeline DPP (Display Pre-Processor) - frame data from image DMA and applies the selected image processing function before transferring it to DECON DECON (Display and Enhancement Controller) - same as previous decon role. and dma and dpp are wired with hardware (They can not mix with other channel) channel> sysMMU> DMA> DPP ======================= ch0 MMU_0 GF0 GF0 ch1 MMU_0 G0 GF1 ch2 MMU_1 G1 GF2 ch3 MMU_1 GF1 GF3 ch4 MMU_2 VG0 VG0 ch5 MMU_2 G2 GF4 ch6 MMU_3 G3 GF5 ch7 MMU_3 VG1 VG1 note that exynos850 has 4 channel with different wiring. 4. Todos before RFC - remove all vendor style code - more features (resolution, format, plane) - proper way register setting for dma, dpp channel - make DP code to proper mainline code using helper functions To: Inki Dae <inki.dae@xxxxxxxxxxx> To: Krzysztof Kozlowski <krzk@xxxxxxxxxx> To: Alim Akhtar <alim.akhtar@xxxxxxxxxxx> To: David Virag <virag.david003@xxxxxxxxx> To: Sam Protsenko <semen.protsenko@xxxxxxxxxx> Cc: linux-samsung-soc@xxxxxxxxxxxxxxx Signed-off-by: Kwanghoon Son <k.son@xxxxxxxxxxx> --- Kwanghoon Son (7): drm/exynos: Initial Exynosautov9 drm drm/exynos: Add Exynosautov9 decon drm/exynos: Add drivers on drv.c drm/exynos: exynos DPTX hw clk: samsung: exynoautov9: Add dptx cmu phy: samsung,dp-video-phy: Add exynosautov9 dp phy arm64: dts: exynosautov9: Enable drm arch/arm64/boot/dts/exynos/exynosautov9-dpu.dtsi | 110 + arch/arm64/boot/dts/exynos/exynosautov9.dtsi | 30 + drivers/clk/samsung/clk-exynosautov9.c | 35 + drivers/gpu/drm/exynos/Kconfig | 17 + drivers/gpu/drm/exynos/Makefile | 3 + drivers/gpu/drm/exynos/exynos9_decon.c | 1765 +++++++ drivers/gpu/drm/exynos/exynos_dpp.c | 96 + drivers/gpu/drm/exynos/exynos_dpp.h | 278 ++ drivers/gpu/drm/exynos/exynos_dpu_dma.c | 330 ++ drivers/gpu/drm/exynos/exynos_dpu_dma.h | 16 + drivers/gpu/drm/exynos/exynos_drm_dp.c | 5038 ++++++++++++++++++++ drivers/gpu/drm/exynos/exynos_drm_dp.h | 964 ++++ .../gpu/drm/exynos/exynos_drm_dp_link_training.c | 586 +++ drivers/gpu/drm/exynos/exynos_drm_drv.c | 11 +- drivers/gpu/drm/exynos/exynos_drm_drv.h | 3 + drivers/gpu/drm/exynos/regs-decon9.h | 1244 +++++ drivers/phy/samsung/phy-exynos-dp-video.c | 9 +- include/dt-bindings/clock/samsung,exynosautov9.h | 4 + 18 files changed, 10537 insertions(+), 2 deletions(-) --- base-commit: 9852d85ec9d492ebef56dc5f229416c925758edc change-id: 20241002-auto9-961d6a19be50 Best regards, -- Kwanghoon Son <k.son@xxxxxxxxxxx>
