STRUCT DPU_HW_WB_OPS(9)

💅 struct dpu_hw_wb_ops(9) — from the Kernel API Manual, bestie 🎀

okay so picture this: it's the struct dpu_hw_wb_ops page from the Kernel API Manual and it's literally the blueprint for how you talk to the writeback (wb) hardware driver. it's giving "interface goals" ✨

🌸 NAME 🌸

struct dpu_hw_wb_ops — the interface to the wb hw driver functions, no cap 💖

and like, the big assumption here? these functions get called after the clocks are enabled. so don't come for them before that, fr fr. ⏰

✨ SYNOPSIS ✨

struct dpu_hw_wb_ops {
    void (*setup_outaddress)(struct dpu_hw_wb *ctx, struct dpu_hw_wb_cfg
*wb);
    void (*setup_outformat)(struct dpu_hw_wb *ctx, struct dpu_hw_wb_cfg
*wb, const struct msm_format *fmt);
    void (*setup_roi)(struct dpu_hw_wb *ctx, struct dpu_hw_wb_cfg *wb);
    void (*setup_qos_lut)(struct dpu_hw_wb *ctx, struct dpu_hw_qos_cfg
*cfg);
    void (*setup_cdp)(struct dpu_hw_wb *ctx, const struct msm_format
*fmt, bool enable);
    bool (*setup_clk_force_ctrl)(struct dpu_hw_wb *ctx, bool enable);
    void (*bind_pingpong_blk)(struct dpu_hw_wb *ctx, const enum
dpu_pingpong pp);
 };

look at all those function pointers, they're literally a whole squad 🫶

👑 Members 👑

• setup_outaddress — sets up the output address from the writeback job. where the pixels are gonna land, basically. 📍
• setup_outformat — sets up the output format of the writeback block, straight from the writeback job. it's the glow-up spec for your pixels. 🎨
• setup_roi — sets up the ROI (Region of Interest) parameters. yes, it's exactly as main-character as it sounds. 🎯
• setup_qos_lut — sets up the qos LUT for the writeback block, based on the input. it's a whole lookup table era. 📊
• setup_cdp — sets up the chroma down prefetch block for the writeback block. iconic behavior only. 🌈
• setup_clk_force_ctrl — sets up clock force control. returns a bool, so it's got opinions. 🔥
• bind_pingpong_blk — enables/disables the connection with the ping-pong block. it's giving "are we connected or are we not" 💀

🦋 SEE ALSO 🦋

• Kernel file ./drivers/gpu/drm/msm/disp/dpu1/dpu_hw_wb.h and the struct dpu_hw_wb(9) — go read those too, iykyk 📚

ok real talk: these are function pointers, so they're only valid to call once the clocks are on. that's the whole premise of this struct. don't skip the vibe check ⚠️

and that's the whole page, bestie — slay 💅✨

this one lives in ./drivers/gpu/drm/msm/disp/dpu1, dated October 2026, and it's struct dpu_hw_wb_ops(9) to the very end — mwah, ily, bye 🎀💜