Camera Module v2 (imx219) missing 206FPS mode

Start by reproducing the issue with rpicam-vid --list-cameras on kernel 6.12 using an IMX219 Camera v2, then compare the reported modes with kernel 6.1.93 and the earlier fix in linux issue 5438. Trace the IMX219 camera mode handling in the kernel and verify that 640x480 is reported at 206 FPS again without regressing the other listed modes.

Describe the bug

The documentation for the camera modules lists 640×480p 206fps as a supported mode for the camera module v2 but when I use rpicam-vid --list-cameras the 206FPS mode is not available, replaced with 103FPS instead:

pi@pi3:~/camera $ uname -a
Linux pi3 6.12.41-v8+ #1897 SMP PREEMPT Fri Aug  1 12:20:46 BST 2025 aarch64 GNU/Linux
pi@pi3:~/camera $ rpicam-vid --list-cameras
Available cameras
-----------------
0 : imx219 [3280x2464 10-bit RGGB] (/base/soc/i2c0mux/i2c@1/imx219@10)
    Modes: 'SRGGB10_CSI2P' : 640x480 [103.33 fps - (1000, 752)/1280x960 crop]
                             1640x1232 [41.85 fps - (0, 0)/3280x2464 crop]
                             1920x1080 [47.57 fps - (680, 692)/1920x1080 crop]
                             3280x2464 [21.19 fps - (0, 0)/3280x2464 crop]
           'SRGGB8' : 640x480 [103.33 fps - (1000, 752)/1280x960 crop]
                      1640x1232 [41.85 fps - (0, 0)/3280x2464 crop]
                      1920x1080 [47.57 fps - (680, 692)/1920x1080 crop]
                      3280x2464 [21.19 fps - (0, 0)/3280x2464 crop]

I found this bug report https://github.com/raspberrypi/linux/issues/5438 that was resolved around the time of the 6.1 kernel. So I built that version and booted into it. With that kernel version the 206FPS mode was listed:

pi@pi3:~/camera $ uname -a
Linux pi3 6.1.93-v8+ #1 SMP PREEMPT Mon Aug 11 03:31:21 BST 2025 aarch64 GNU/Linux
pi@pi3:~/camera $ rpicam-vid --list-cameras
Available cameras
-----------------
0 : imx219 [3280x2464 10-bit RGGB] (/base/soc/i2c0mux/i2c@1/imx219@10)
    Modes: 'SRGGB10_CSI2P' : 640x480 [206.65 fps - (1000, 752)/1280x960 crop]
                             1640x1232 [41.85 fps - (0, 0)/3280x2464 crop]
                             1920x1080 [47.57 fps - (680, 692)/1920x1080 crop]
                             3280x2464 [21.19 fps - (0, 0)/3280x2464 crop]
           'SRGGB8' : 640x480 [206.65 fps - (1000, 752)/1280x960 crop]
                      1640x1232 [83.70 fps - (0, 0)/3280x2464 crop]
                      1920x1080 [47.57 fps - (680, 692)/1920x1080 crop]
                      3280x2464 [21.19 fps - (0, 0)/3280x2464 crop]

So it looks like there has been a regression since that issue was originally fixed.

Steps to reproduce the behaviour

boot into the latest Raspberry Pi OS with kernel 6.12, plug in a Camera v2 module and run rpicam-vid --list-cameras. Observe that the 206FPS mode is not listed.

Device (s)

Raspberry Pi 3 Mod. B

System

pi@pi3:~/camera $ cat /etc/rpi-issue
Raspberry Pi reference 2025-05-13
Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, 5dabc7dc940059dfbc46af5d97b60a1e812523dd, stage4

pi@pi3:~/camera $ vcgencmd version
Jul 17 2025 17:32:49 
Copyright (c) 2012 Broadcom
version a668b6e6edce3274de221324b93cb8741e4a7f7c (clean) (release) (start)

pi@pi3:~/camera $ uname -a
Linux pi3 6.1.93-v8+ #1 SMP PREEMPT Mon Aug 11 03:31:21 BST 2025 aarch64 GNU/Linux

Logs

No response

Additional context

No response