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a690: GPU snapshot triggers AHB errors

forked out of mesa/mesa#9246

[root@thunkpad robclark]# cat /sys/kernel/debug/dri/0/gpu > /dev/null
[ +13.818009] a6xx_irq: 241 callbacks suppressed
[  +0.000017] adreno 3d00000.gpu: CP | AHB bus error
[  +0.000506] adreno 3d00000.gpu: CP | AHB bus error
[  +0.000064] adreno 3d00000.gpu: CP | AHB bus error
[  +0.000015] adreno 3d00000.gpu: CP | AHB bus error
[  +0.000042] adreno 3d00000.gpu: CP | AHB bus error
[  +0.000010] adreno 3d00000.gpu: CP | AHB bus error
[  +0.000008] adreno 3d00000.gpu: CP | AHB bus error
[  +0.000009] adreno 3d00000.gpu: CP | AHB bus error
[  +0.000008] adreno 3d00000.gpu: CP | AHB bus error