[v3,0/3] media: vimc: Add timing controls for fps config
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Message ID 20260204203726.1820226-1-faizel.kb@gmail.com
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  • media: vimc: Add timing controls for fps config
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Faizel K B Feb. 4, 2026, 8:37 p.m. UTC 
Control frame timing of vimc sensor by adding support for V4L2 timing
controls (VBLANK, HBLANK, PIXEL_RATE). PIXEL_RATE and HBLANK are fixed as
readonly with default values. VBLANK is configurable.

First version patch attempted to implement direct frame rate control as
fraction. vimc sensor should have controls like real sensor to control the
framerate.

Changes in v3:
- Fixed 64-bit division on 32-bit architectures in vimc_calc_vblank()
  Reported-by: kernel test robot <lkp@intel.com>
  Closes: https://lore.kernel.org/oe-kbuild-all/202602031319.6Nd13RwV-lkp@intel.com/
  Closes: https://lore.kernel.org/oe-kbuild-all/202602031452.JzAaJ8BU-lkp@intel.com/
- Used do_div() for portable 64-bit division
- Link to v2: https://lore.kernel.org/linux-media/20260202194645.1287757-1-faizel.kb@gmail.com/

Changes in v2:
- Changed the patch subject to indicate timing control.
- Removed 'v4l2_fract' element from sensor struct
- Removed frameinterval functions for vimc_sensor_pad_ops
- Added PIXEL_RATE,HBLANK,VBLANK V4L2 Controls
- Added fps delay calculation based on timing controls
- Default PIXEL_RATE as 160 MHz. HBLANK as 800
- Default fps 30 for resolution up to 1920 * 1080 (2,073,600 pixels)
  above which the fps is 10 (PIXEL_RATE must be changed to support
  higher resolutions).
- Link to v1: https://lore.kernel.org/linux-media/cr4tjjlq53ezux7lzrusy4wb7ji26trwkipfkjl33kwv6z4ut7@r6hvuzki66bj/

Example usage:
  # Set vblank as 1000
  v4l2-ctl -d /dev/v4l-subdev0 --set-ctrl=vertical_blanking=1000

  # Capture and verify frame rate.
  # Real framerate depends on the CPU performance

  yavta /dev/video2 --capture=100

Faizel K B (3):
  media: vimc: sensor: Move vimc_sensor_device to common header
  media: vimc: sensor: Add pixel_rate,vblank and hblank configuration
  media: vimc: streamer: Apply sensor frame rate in streamer thread

 drivers/media/test-drivers/vimc/vimc-common.h |  41 +++++++
 drivers/media/test-drivers/vimc/vimc-sensor.c | 114 ++++++++++++++----
 .../media/test-drivers/vimc/vimc-streamer.c   |  33 ++++-
 3 files changed, 160 insertions(+), 28 deletions(-)


base-commit: c824345288d11e269ce41b36c105715bc2286050