AMDGPU SECUREDISPLAY DEBUGFS TEST INTERFACE(9)

💖 AMDGPU SECUREDISPLAY debugfs test interface 💖

okay so this is straight out of the Kernel API Manual and it's literally the cheat sheet for poking at the securedisplay debugfs test interface 🎀 like, this is your group chat with the driver, bestie.

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✨ how to use? ✨

bestie the whole vibe is just echoing an opcode at a file, that's it, that's the whole thing 👑

echo opcode <value> > <debugfs_dir>/dri/xxx/securedisplay_test

and some examples because iykyk:

echo 1 > <debugfs_dir>/dri/xxx/securedisplay_test

echo 2 phy_id > <debugfs_dir>/dri/xxx/securedisplay_test

<debugfs_dir>/dri/xxx/securedisplay_test

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🦋 opcode 🦋

• 1 — queries whether the TA is responding. lowkey this one is used only for validation purposes 🫶
• 2 — sends the region of Interest and the CRC value to I2C. the (uint32)phy_id gets send to determine which DIO scratch register should be used to get the ROI, and to receive i2c_buf as the output 💅

ngl, if you want more detail you can refer to the header file ta_securedisplay_if.h 🌸

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🌈 SEE ALSO 🌈

Kernel file ./drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c — go read it, it's giving main character energy ⭐

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and that's the whole page, bestie 💜 it came from ./drivers/gpu/drm/amd/amdgpu and it's dated October 2026 — slay, no cap, see you in the next manpage 🎀✨