[PATCH 00/17] Rework frame descriptors

[Sakari Ailus <sakari.ailus@linux.intel.com>]

Hi folks,

This smallish set makes frame descriptors dynamically allocated and
implements a single-entry frame descriptor based on the device's format,
using a new helper called v4l2_subdev_get_frame_desc(). All drivers that
do not obtain their frame descriptor from upstream are converted. The
helper also obtains a frame descriptor for the desired type (parallel or
CSI-2) and checks there's at least one entry there. These checks are
removed from drivers that currently perform them. (Some drivers also check
there's exactly a single frame descriptor entry but I think in most cases
this check could be loosened. That could be done after this set.)

On callee side these patches introduce no changes as the number of
pre-allocated memory for 8 frame descriptors remains as-is. The
get_frame_desc() pad op can return more than 8 frame descriptors by
setting the num_entries to the desired number and returning -ENOSPC.

If people prefer using cleanup.h / __free() to release the dynamically
allocated array (I think I'd almost require that), I'll merge the
now-separate __v4l2_subdev_get_frame_desc() into
v4l2_subdev_get_frame_desc().

More formats can be added to df-to-mbus conversion as needed. These are
meant to be initial formats that are enough for typical raw sensors (and
one RGB format, too).

Sakari Ailus (17):
  media: v4l2-common: Add mipi_csi2_dt_for_mbus()
  media: v4l2-subdev: Align frame descriptor error codes with routing
  media: v4l2-subdev: Prepare for changes in getting frame descriptors
  media: v4l2-subdev: Allocate frame descriptors based on the need
  media: v4l2-subdev: Provide a cleanup-friendly get_frame_desc
  media: v4l2-subdev: Change the maximum number of routes
  media: v4l2-subdev: Return dynamically allocated pass-through routes
  media: v4l2-subdev: Always return at least one frame descriptor
  media: bcm2835-unicam: Use v4l2_subdev_get_frame_desc()
  media: nxp: imx8-isi: Use v4l2_subdev_get_frame_desc()
  media: raspberrypi: cfe: Use v4l2_subdev_get_frame_desc()
  media: rzg2l-cru: Use v4l2_subdev_get_frame_desc()
  media: rkisp1: Use v4l2_subdev_get_frame_desc()
  media: exynos4-is: Use v4l2_subdev_get_frame_desc()
  media: ti: cal: Use v4l2_subdev_get_frame_desc()
  media: ipu6: Use v4l2_subdev_get_frame_desc()
  staging: media: ipu7: Use v4l2_subdev_get_frame_desc()

 drivers/media/pci/intel/ipu6/ipu6-isys-csi2.c |  23 ++-
 .../media/platform/broadcom/bcm2835-unicam.c  |  20 +--
 .../platform/nxp/imx8-isi/imx8-isi-crossbar.c |  15 +-
 .../media/platform/raspberrypi/rp1-cfe/cfe.c  |  29 ++--
 .../platform/renesas/rzg2l-cru/rzg2l-video.c  |  21 +--
 .../platform/rockchip/rkisp1/rkisp1-isp.c     |  12 +-
 .../samsung/exynos4-is/fimc-capture.c         |  16 +-
 drivers/media/platform/ti/cal/cal-camerarx.c  |  25 ++-
 drivers/media/v4l2-core/v4l2-common.c         |  47 ++++++
 drivers/media/v4l2-core/v4l2-subdev.c         | 156 +++++++++++++++---
 .../staging/media/ipu7/ipu7-isys-csi-phy.c    |  16 +-
 drivers/staging/media/ipu7/ipu7-isys-csi2.c   |  22 ++-
 include/media/mipi-csi2.h                     |   2 +
 include/media/v4l2-subdev.h                   |  76 ++++++++-
 14 files changed, 344 insertions(+), 136 deletions(-)

-- 
2.47.3