Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:[EOL][EOL]drm/mediatek: Disable AFBC support on Mediatek DRM driver[EOL][EOL]Commit c410fa9b07c3 ("drm/mediatek: Add AFBC support to Mediatek DRM[EOL]driver") added AFBC support to Mediatek DRM and enabled the[EOL]32x8/split/sparse modifier.[EOL][EOL]However, this is currently broken on Mediatek MT8188 (Genio 700 EVK[EOL]platform); tested using upstream Kernel and Mesa (v25.2.1), AFBC is used by[EOL]default since Mesa v25.0.[EOL][EOL]Kernel trace reports vblank timeouts constantly, and the render is garbled:[EOL][EOL]```[EOL][CRTC:62:crtc-0] vblank wait timed out[EOL]WARNING: CPU: 7 PID: 70 at drivers/gpu/drm/drm_atomic_helper.c:1835 drm_atomic_helper_wait_for_vblanks.part.0+0x24c/0x27c[EOL][...][EOL]Hardware name: MediaTek Genio-700 EVK (DT)[EOL]Workqueue: events_unbound commit_work[EOL]pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)[EOL]pc : drm_atomic_helper_wait_for_vblanks.part.0+0x24c/0x27c[EOL]lr : drm_atomic_helper_wait_for_vblanks.part.0+0x24c/0x27c[EOL]sp : ffff80008337bca0[EOL]x29: ffff80008337bcd0 x28: 0000000000000061 x27: 0000000000000000[EOL]x26: 0000000000000001 x25: 0000000000000000 x24: ffff0000c9dcc000[EOL]x23: 0000000000000001 x22: 0000000000000000 x21: ffff0000c66f2f80[EOL]x20: ffff0000c0d7d880 x19: 0000000000000000 x18: 000000000000000a[EOL]x17: 000000040044ffff x16: 005000f2b5503510 x15: 0000000000000000[EOL]x14: 0000000000000000 x13: 74756f2064656d69 x12: 742074696177206b[EOL]x11: 0000000000000058 x10: 0000000000000018 x9 : ffff800082396a70[EOL]x8 : 0000000000057fa8 x7 : 0000000000000cce x6 : ffff8000823eea70[EOL]x5 : ffff0001fef5f408 x4 : ffff80017ccee000 x3 : ffff0000c12cb480[EOL]x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff0000c12cb480[EOL]Call trace:[EOL] drm_atomic_helper_wait_for_vblanks.part.0+0x24c/0x27c (P)[EOL] drm_atomic_helper_commit_tail_rpm+0x64/0x80[EOL] commit_tail+0xa4/0x1a4[EOL] commit_work+0x14/0x20[EOL] process_one_work+0x150/0x290[EOL] worker_thread+0x2d0/0x3ec[EOL] kthread+0x12c/0x210[EOL] ret_from_fork+0x10/0x20[EOL]---[ end trace 0000000000000000 ]---[EOL]```[EOL][EOL]Until this gets fixed upstream, disable AFBC support on this platform, as[EOL]it's currently broken with upstream Mesa.