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The driver is designed and architected keeping the bi-stable nature and low-power requirements of epaper display based systems in mind along with having adequate flexibility to support varying use-case requirements for the e-paper display use-cases. The driver integrates with the DRM atomic modesetting framework and supports: - SPI communication in both 4-wire mode (separate D/C GPIO) and 3-wire mode (9-bit SPI with embedded D/C# bit) - Full 4-way rotation via the Data Entry Mode register, with no GPU or memory-copy overhead - Three independently selectable refresh waveforms: partial (~300–500 ms), full (~1.5–2 s), and fast (~1.0–1.5 s) - 3-colour BWR pixel classification for panels with a red RAM plane - Pixel format support: XRGB8888 (color path) and R1 (native 1bpp, zero-copy path) - Runtime PM with configurable autosuspend: the controller enters Mode 1 deep sleep (RAM retained) after an idle timeout, waking transparently on the next frame update - System suspend/resume: switches to Mode 2 deep sleep (maximum power savings) on system suspend and rebuilds the pipeline on resume - Runtime-configurable DRM plane properties for refresh mode, colour mode, and session control (clear-on-init/close/disable, init-refresh waveform); rotation is set at probe time from a device tree property, and border waveform uses a fixed per-panel default Changes from v1[0]: - Restructured into 14 modular patches covering bindings, driver core, features, and platform integration (was 6 patches in v1) - Added comprehensive device-tree bindings support for vendor prefixes and SSD16xx controller configurations - Refactored driver architecture from drm/tiny panel driver to drm/solomon bridge driver - Switch to using GEM_SHMEM helpers - Refactored data entry mode implementation - Removed runtime-configurable rotation/border-waveform DRM properties and their module params; rotation is now set via device tree, and border waveform now uses an enhanced fixed per-panel default - Added support for Solomon SSD1677 controller variant - Improved session management with plane properties - Added comprehensive power management support - Support for panels with reversed RAM X order - Dropped RGB888, RGB565, R8, NV12, NV16, YUYV, and UYVY format support; driver now only exposes XRGB8888 and R1 This has been tested against my development branch [1] using attached test suite [2] and logs[3], individual results[4] and result summary[5] uploaded. [0]: [V1 patch series] https://lore.kernel.org/all/20260430183311.2978142-1-devarsht@ti.com/ [1]: [Development Branch] https://github.com/devarsht/linux-next/tree/epaper_drm_misc_next_staging_27_09_26 [2]: [Test Suite] https://github.com/devarsht/linux-next/tree/epaper_drm_misc_next_staging_27_09_26/tests_27sept_new [3]: [Test Logs] https://github.com/devarsht/linux-next/tree/epaper_drm_misc_next_staging_27_09_26/tests_27sept_new/logs [4]: [Test Results] https://github.com/devarsht/linux-next/tree/epaper_drm_misc_next_staging_27_09_26/tests_27sept_new/results [5]: [Result Summary] https://github.com/devarsht/linux-next/blob/epaper_drm_misc_next_staging_27_09_26/tests_27sept_new/results/run_all_20250529_190854.summary Devarsh Thakkar (13): dt-bindings: vendor-prefixes: Add Dalian Good Display Co., Ltd. dt-bindings: display: Add Solomon SSD16xx e-paper controller binding dt-bindings: display: solomon,ssd16xx: Add Solomon SSD1677 controller drm/solomon: Add DRM driver for Solomon SSD16xx e-paper display controllers drm/solomon: ssd16xx: Add clear_on_init/close/disable session management drm/solomon: ssd16xx: Add support for Solomon SSD1677 controller drm/solomon: ssd16xx: Add power management support drm/solomon: ssd16xx: Expose refresh mode as plane property drm/solomon: ssd16xx: Expose color mode as plane property drm/solomon: ssd16xx: Expose session management as plane properties MAINTAINERS: Add entry for Solomon SSD16xx DRM driver arm64: defconfig: Enable DRM_SSD16XX for AM62L3 EVM arm64: dts: ti: Add AM62L3 EVM overlay for GDEY042T81 e-paper display LiangCheng Wang (1): drm/solomon: ssd16xx: support panels whose RAM X order is reversed .../bindings/display/solomon,ssd16xx.yaml | 88 + .../devicetree/bindings/vendor-prefixes.yaml | 2 + MAINTAINERS | 8 + arch/arm64/boot/dts/ti/Makefile | 6 + .../ti/k3-am62l3-evm-epaper-gdey042t81.dtso | 96 + arch/arm64/configs/defconfig | 1 + drivers/gpu/drm/solomon/Kconfig | 13 + drivers/gpu/drm/solomon/Makefile | 1 + drivers/gpu/drm/solomon/ssd16xx.c | 2607 +++++++++++++++++ 9 files changed, 2822 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/solomon,ssd16xx.yaml create mode 100644 arch/arm64/boot/dts/ti/k3-am62l3-evm-epaper-gdey042t81.dtso create mode 100644 drivers/gpu/drm/solomon/ssd16xx.c -- 2.39.1