CONTENT ADAPTIVE SHARPNESS FILTER (CASF)(9)

💅 NAME 💅

Content Adaptive Sharpness Filter (CASF) — the CASF(9) Kernel API Manual page, bestie. Yes, that’s the manual name folded in cute, no cap. 🎀

✨ DESCRIPTION ✨

Okay so starting from LNL, the display engine supports an adaptive sharpening filter, enhancing the image quality. 💖 The display hardware utilizes the second pipe scaler for implementing CASF. The way that works is honestly iconic.

⚠️ If sharpness is being enabled then pipe scaling cannot be used. Not a vibe suggestion, bestie — it’s a hard rule. 💀

This filter operates on a region of pixels based on the tap size. Coefficients are used to generate an alpha value which blends the sharpened image to original image. Slay, that’s the whole tea. ✨

🦋 SEE ALSO 🦋

• Kernel file — ./drivers/gpu/drm/i915/display/intel_casf.c

Cute sign-off bestie: source/version is ./drivers/gpu/drm/i915/display, date is October 2026, and the page is Content Adap...ilter (CASF)(9) — mwah! 💅🫶💖