[bug] irq delay in rkisp1

[DrYak]

Hello, I might have found that this kernel error message coincides with the weird color banding when taking very high resolution photos. Might be of interest to Megi.

Oct 09 09:17:32 PinePhonePro kernel: ------------[ cut here ]------------
Oct 09 09:17:32 PinePhonePro kernel: irq delay is too long, buffers might not be in sync
Oct 09 09:17:32 PinePhonePro kernel: WARNING: CPU: 0 PID: 0 at drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c:1023 rkisp1_isp_isr+0x190/0x1c8
Oct 09 09:17:32 PinePhonePro kernel: Modules linked in: ip6t_rpfilter ip6table_mangle ip6table_filter qmi_wwan cdc_wdm usbnet usb_f_ecm brcmfmac_wcc typec_extcon fusb302 brcmfmac tcpm typec hci_uart btbcm cfg80211 brcmutil ip6_tables
Oct 09 09:17:32 PinePhonePro kernel: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.5.0-pinephonepro #1
Oct 09 09:17:32 PinePhonePro kernel: Hardware name: Pine64 PinePhonePro (DT)
Oct 09 09:17:32 PinePhonePro kernel: pstate: 400000c5 (nZcv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
Oct 09 09:17:32 PinePhonePro kernel: pc : rkisp1_isp_isr+0x190/0x1c8
Oct 09 09:17:32 PinePhonePro kernel: lr : rkisp1_isp_isr+0x190/0x1c8
Oct 09 09:17:32 PinePhonePro kernel: sp : ffff800080003ec0
Oct 09 09:17:32 PinePhonePro kernel: x29: ffff800080003ec0 x28: ffff80008211cec0 x27: ffff0000f77c0fc0
Oct 09 09:17:32 PinePhonePro kernel: x26: ffff800082655000 x25: ffff000000dede00 x24: ffff800081b5b008
Oct 09 09:17:32 PinePhonePro kernel: x23: ffff800082109e20 x22: 000000000000002a x21: 0000000000000002
Oct 09 09:17:32 PinePhonePro kernel: x20: ffff0000053c8080 x19: 0000000000000042 x18: 0000000000000000
Oct 09 09:17:32 PinePhonePro kernel: x17: ffff800075bb0000 x16: ffff800080000000 x15: 0000000000000000
Oct 09 09:17:32 PinePhonePro kernel: x14: ffff80008211cec0 x13: 636e7973206e6920 x12: ffff8000824be9e0
Oct 09 09:17:32 PinePhonePro kernel: x11: 0000000000000003 x10: 0000000000000001 x9 : ffff80008010add4
Oct 09 09:17:32 PinePhonePro kernel: x8 : 00000000000bffe8 x7 : c0000000ffff7fff x6 : 0000000000000001
Oct 09 09:17:32 PinePhonePro kernel: x5 : ffff0000f770da88 x4 : 0000000000000000 x3 : 0000000000000027
Oct 09 09:17:32 PinePhonePro kernel: x2 : 0000000000000023 x1 : 0000000000000027 x0 : 0000000000000033
Oct 09 09:17:32 PinePhonePro kernel: Call trace:
Oct 09 09:17:32 PinePhonePro kernel:  rkisp1_isp_isr+0x190/0x1c8
Oct 09 09:17:32 PinePhonePro kernel:  rkisp1_isr+0x2c/0x50
Oct 09 09:17:32 PinePhonePro kernel:  __handle_irq_event_percpu+0x58/0x1c8
Oct 09 09:17:32 PinePhonePro kernel:  handle_irq_event_percpu+0x1c/0x68
Oct 09 09:17:32 PinePhonePro kernel:  handle_irq_event+0x44/0xd0
Oct 09 09:17:32 PinePhonePro kernel:  handle_fasteoi_irq+0xc4/0x1e0
Oct 09 09:17:32 PinePhonePro kernel:  generic_handle_domain_irq+0x30/0x50
Oct 09 09:17:32 PinePhonePro kernel:  gic_handle_irq+0x54/0x12c
Oct 09 09:17:32 PinePhonePro kernel:  call_on_irq_stack+0x24/0x40
Oct 09 09:17:32 PinePhonePro kernel:  do_interrupt_handler+0x84/0x90
Oct 09 09:17:32 PinePhonePro kernel:  el1_interrupt+0x34/0x50
Oct 09 09:17:32 PinePhonePro kernel:  el1h_64_irq_handler+0x14/0x20
Oct 09 09:17:32 PinePhonePro kernel:  el1h_64_irq+0x64/0x68
Oct 09 09:17:32 PinePhonePro kernel:  cpuidle_enter_state+0x214/0x440
Oct 09 09:17:32 PinePhonePro kernel:  cpuidle_enter+0x3c/0x58
Oct 09 09:17:32 PinePhonePro kernel:  call_cpuidle+0x20/0x40
Oct 09 09:17:32 PinePhonePro kernel:  do_idle+0x1e0/0x240
Oct 09 09:17:32 PinePhonePro kernel:  cpu_startup_entry+0x28/0x38
Oct 09 09:17:32 PinePhonePro kernel:  rest_init+0xc8/0xd0
Oct 09 09:17:32 PinePhonePro kernel:  arch_call_rest_init+0x14/0x20
Oct 09 09:17:32 PinePhonePro kernel:  start_kernel+0x5f8/0x828
Oct 09 09:17:32 PinePhonePro kernel:  __primary_switched+0xb4/0xc8
Oct 09 09:17:32 PinePhonePro kernel: ---[ end trace 0000000000000000 ]---

[DrYak]

After careful inspection of the timestamps in the logs: it's a red herring.
irq delays don't lead to the color bands systematically.
They occur in the log when Shutter is slow to respond (e.g.: "wait? close?" pops-up).