pvr_cr_poll_reg64(9)

💅 pvr_cr_poll_reg64 — Kernel API Manual energy

okay so bestie, this is the pvr_cr_poll_reg64(9) page from the Kernel API Manual, and it's all about waiting for a 64-bit register to match a given value by polling. no cap, it's giving patient main character energy 🌈✨.

🌸 NAME 🌸

pvr_cr_poll_reg64 — wait for a 64-bit register to match a given value by polling. that's literally the whole assignment, and it ate 💅.

✨ SYNOPSIS ✨

the signature is exactly this, bestie — do not freestyle it:

int pvr_cr_poll_reg64 (struct pvr_device *pvr_dev , u32 reg_addr , u64
       reg_value , u64 reg_mask , u64 timeout_usec );

🎀 ARGUMENTS 🎀

• pvr_dev — target PowerVR device 🫶
• reg_addr — address of register 📍
• reg_value — expected register value (after masking) 👀
• reg_mask — mask of bits valid for comparison with reg_value 🧚
• timeout_usec — timeout length, in us ⏳

💖 RETURN 💖

• 0 on success, or
• -ETIMEDOUT on timeout 😭

it's a tiny return menu: success slays with 0, and a timeout gives you -ETIMEDOUT, periodt.

🦋 SEE ALSO 🦋

the related-reference friend group is huge, iykyk:

• Kernel file ./drivers/gpu/drm/imagination/pvr_device.h
• struct pvr_gpu_id(9)
• struct pvr_fw_version(9)
• struct pvr_device_data(9)
• struct pvr_device(9)
• struct pvr_file(9)
• PVR_HAS_FEATURE(9)
• PVR_FEATURE_VALUE(9)
• PVR_HAS_QUIRK(9)
• PVR_HAS_ENHANCEMENT(9)
• PVR_PACKED_BVNC(9)
• pvr_gpu_id_to_packed_bvnc(9)
• PVR_CR_FIELD_GET(9)
• pvr_cr_read32(9)
• pvr_cr_read64(9)
• pvr_cr_write32(9)
• pvr_cr_write64(9)
• pvr_cr_poll_reg32(9)
• pvr_round_up_to_cacheline_size(9)
• IOCTL validation helpers(9)
• pvr_ioctl_union_padding_check(9)
• PVR_STATIC_ASSERT_64BIT_ALIGNED(9)
• PVR_IOCTL_UNION_PADDING_CHECK(9)

signing off from ./drivers/gpu/drm/imagination 💖 — October 2026. byeee bestie, go be iconic with your register polling 🫶🔥