Hi Tomi,
On Mon, Jun 07, 2021 at 09:39:25AM +0300, Tomi Valkeinen wrote:
> On 04/06/2021 18:20, Laurent Pinchart wrote:
> > On Thu, May 27, 2021 at 12:42:44PM +0300, Tomi Valkeinen wrote:
> >> We have 'struct v4l2_subdev_pad_config' which contains configuration for
> >> a single pad used for the TRY functionality, and an array of those
> >> structs is passed to various v4l2_subdev_pad_ops.
> >>
> >> I was working on subdev internal routing between pads, and realized that
> >> there's no way to add TRY functionality for routes, which is not pad
> >> specific configuration. Adding a separate struct for try-route config
> >> wouldn't work either, as e.g. set-fmt needs to know the try-route
> >> configuration to propagate the settings.
> >>
> >> This patch adds a new struct, 'struct v4l2_subdev_state' (which at the
> >> moment only contains the v4l2_subdev_pad_config array) and the new
> >> struct is used in most of the places where v4l2_subdev_pad_config was
> >> used. All v4l2_subdev_pad_ops functions taking v4l2_subdev_pad_config
> >> are changed to instead take v4l2_subdev_state.
> >
> > I really like this change, especially for the next steps that it
> > enables.
> >
> >> The changes to drivers/media/v4l2-core/v4l2-subdev.c and
> >> include/media/v4l2-subdev.h were written by hand, and all the driver
> >> changes were done with the semantic patch below. The spatch needs to be
> >> applied to a select list of directories. I used the following shell
> >> commands to apply the spatch:
> >>
> >> dirs="drivers/media/i2c drivers/media/platform drivers/media/usb drivers/media/test-drivers/vimc drivers/media/pci drivers/staging/media"
> >> for dir in $dirs; do spatch -j8 --dir --include-headers --no-show-diff --in-place --sp-file v4l2-subdev-state.cocci $dir; done
> >>
> >> Note that Coccinelle chokes on a few drivers (gcc extensions?). With
> >> minor changes we can make Coccinelle run fine, and these changes can be
> >> reverted after spatch. The diff for these changes is:
> >>
> >> diff --git a/drivers/media/i2c/s5k5baf.c b/drivers/media/i2c/s5k5baf.c
> >> index 6e702b57c37d..5f136831039f 100644
> >> --- a/drivers/media/i2c/s5k5baf.c
> >> +++ b/drivers/media/i2c/s5k5baf.c
> >> @@ -1481,7 +1481,7 @@ static int s5k5baf_set_selection(struct v4l2_subdev *sd,
> >> &s5k5baf_cis_rect,
> >> v4l2_subdev_get_try_crop(sd, cfg, PAD_CIS),
> >> v4l2_subdev_get_try_compose(sd, cfg, PAD_CIS),
> >> - v4l2_subdev_get_try_crop(sd, cfg, PAD_OUT)
> >> + v4l2_subdev_get_try_crop(sd, cfg, PAD_OUT),
> >> };
> >> s5k5baf_set_rect_and_adjust(rects, rtype, &sel->r);
> >> return 0;
> >> diff --git a/drivers/media/platform/s3c-camif/camif-capture.c b/drivers/media/platform/s3c-camif/camif-capture.c
> >> index 9ca49af29542..d92a5fb8835f 100644
> >> --- a/drivers/media/platform/s3c-camif/camif-capture.c
> >> +++ b/drivers/media/platform/s3c-camif/camif-capture.c
> >> @@ -1230,7 +1230,7 @@ static int s3c_camif_subdev_get_fmt(struct v4l2_subdev *sd,
> >> *mf = camif->mbus_fmt;
> >> break;
> >>
> >> - case CAMIF_SD_PAD_SOURCE_C...CAMIF_SD_PAD_SOURCE_P:
> >> + case CAMIF_SD_PAD_SOURCE_C:
> >> /* crop rectangle at camera interface input */
> >> mf->width = camif->camif_crop.width;
> >> mf->height = camif->camif_crop.height;
> >> @@ -1332,7 +1332,7 @@ static int s3c_camif_subdev_set_fmt(struct v4l2_subdev *sd,
> >> }
> >> break;
> >>
> >> - case CAMIF_SD_PAD_SOURCE_C...CAMIF_SD_PAD_SOURCE_P:
> >> + case CAMIF_SD_PAD_SOURCE_C:
> >> /* Pixel format can be only changed on the sink pad. */
> >> mf->code = camif->mbus_fmt.code;
> >> mf->width = crop->width;
> >>
> >> The semantic patch is:
> >>
> >> // <smpl>
> >>
> >> // Change function parameter
> >>
> >> @@
> >> identifier func;
> >> identifier cfg;
> >> @@
> >>
> >> func(...,
> >> - struct v4l2_subdev_pad_config *cfg
> >> + struct v4l2_subdev_state *sd_state
> >> , ...)
> >> {
> >> <...
> >> - cfg
> >> + sd_state
> >> ...>
> >> }
> >>
> >> // Change function declaration parameter
> >>
> >> @@
> >> identifier func;
> >> identifier cfg;
> >> type T;
> >> @@
> >> T func(...,
> >> - struct v4l2_subdev_pad_config *cfg
> >> + struct v4l2_subdev_state *sd_state
> >> , ...);
> >>
> >> // Change function return value
> >>
> >> @@
> >> identifier func;
> >> @@
> >> - struct v4l2_subdev_pad_config
> >> + struct v4l2_subdev_state
> >> *func(...)
> >> {
> >> ...
> >> }
> >>
> >> // Change function declaration return value
> >>
> >> @@
> >> identifier func;
> >> @@
> >> - struct v4l2_subdev_pad_config
> >> + struct v4l2_subdev_state
> >> *func(...);
> >>
> >> // Some drivers pass a local pad_cfg for a single pad to a called function. Wrap it
> >> // inside a pad_state.
> >>
> >> @@
> >> identifier func;
> >> identifier pad_cfg;
> >> @@
> >> func(...)
> >> {
> >> ...
> >> struct v4l2_subdev_pad_config pad_cfg;
> >> + struct v4l2_subdev_state pad_state = { .pads = &pad_cfg };
> >>
> >> <+...
> >>
> >> (
> >> v4l2_subdev_call
> >> |
> >> sensor_call
> >> |
> >> isi_try_fse
> >> |
> >> isc_try_fse
> >> |
> >> saa_call_all
> >> )
> >> (...,
> >> - &pad_cfg
> >> + &pad_state
> >> ,...)
> >>
> >> ...+>
> >> }
> >>
> >> // If the function uses fields from pad_config, access via state->pads
> >>
> >> @@
> >> identifier func;
> >> identifier state;
> >> @@
> >> func(...,
> >> struct v4l2_subdev_state *state
> >> , ...)
> >> {
> >> <...
> >> (
> >> - state->try_fmt
> >> + state->pads->try_fmt
> >> |
> >> - state->try_crop
> >> + state->pads->try_crop
> >> |
> >> - state->try_compose
> >> + state->pads->try_compose
> >> )
> >> ...>
> >> }
> >>
> >> // If the function accesses the filehandle, use fh->state instead
> >>
> >> @@
> >> struct v4l2_subdev_fh *fh;
> >> @@
> >> - fh->pad
> >> + fh->state
> >>
> >> @@
> >> struct v4l2_subdev_fh fh;
> >> @@
> >> - fh.pad
> >> + fh.state
> >>
> >> // Start of vsp1 specific
> >>
> >> @@
> >> @@
> >> struct vsp1_entity {
> >> ...
> >> - struct v4l2_subdev_pad_config *config;
> >> + struct v4l2_subdev_state *config;
> >> ...
> >> };
> >>
> >> @@
> >> symbol entity;
> >> @@
> >> vsp1_entity_init(...)
> >> {
> >> ...
> >> entity->config =
> >> - v4l2_subdev_alloc_pad_config
> >> + v4l2_subdev_alloc_state
> >> (&entity->subdev);
> >> ...
> >> }
> >>
> >> @@
> >> symbol entity;
> >> @@
> >> vsp1_entity_destroy(...)
> >> {
> >> ...
> >> - v4l2_subdev_free_pad_config
> >> + v4l2_subdev_free_state
> >> (entity->config);
> >> ...
> >> }
> >>
> >> @exists@
> >> identifier func =~ "(^vsp1.*)|(hsit_set_format)|(sru_enum_frame_size)|(sru_set_format)|(uif_get_selection)|(uif_set_selection)|(uds_enum_frame_size)|(uds_set_format)|(brx_set_format)|(brx_get_selection)|(histo_get_selection)|(histo_set_selection)|(brx_set_selection)";
> >> symbol config;
> >> @@
> >> func(...) {
> >> ...
> >> - struct v4l2_subdev_pad_config *config;
> >> + struct v4l2_subdev_state *config;
> >> ...
> >> }
> >>
> >> // End of vsp1 specific
> >>
> >> // Start of rcar specific
> >>
> >> @@
> >> identifier sd;
> >> identifier pad_cfg;
> >> @@
> >> rvin_try_format(...)
> >> {
> >> ...
> >> - struct v4l2_subdev_pad_config *pad_cfg;
> >> + struct v4l2_subdev_state *sd_state;
> >> ...
> >> - pad_cfg = v4l2_subdev_alloc_pad_config(sd);
> >> + sd_state = v4l2_subdev_alloc_state(sd);
> >> <...
> >> - pad_cfg
> >> + sd_state
> >> ...>
> >> - v4l2_subdev_free_pad_config(pad_cfg);
> >> + v4l2_subdev_free_state(sd_state);
> >> ...
> >> }
> >>
> >> // End of rcar specific
> >>
> >> // Start of rockchip specific
> >>
> >> @@
> >> identifier func =~ "(rkisp1_rsz_get_pad_fmt)|(rkisp1_rsz_get_pad_crop)|(rkisp1_rsz_register)";
> >> symbol rsz;
> >> symbol pad_cfg;
> >> @@
> >>
> >> func(...)
> >> {
> >> + struct v4l2_subdev_state state = { .pads = rsz->pad_cfg };
> >> ...
> >> - rsz->pad_cfg
> >> + &state
> >> ...
> >> }
> >>
> >> @@
> >> identifier func =~ "(rkisp1_isp_get_pad_fmt)|(rkisp1_isp_get_pad_crop)";
> >> symbol isp;
> >> symbol pad_cfg;
> >> @@
> >>
> >> func(...)
> >> {
> >> + struct v4l2_subdev_state state = { .pads = isp->pad_cfg };
> >> ...
> >> - isp->pad_cfg
> >> + &state
> >> ...
> >> }
> >>
> >> @@
> >> symbol rkisp1;
> >> symbol isp;
> >> symbol pad_cfg;
> >> @@
> >>
> >> rkisp1_isp_register(...)
> >> {
> >> + struct v4l2_subdev_state state = { .pads = rkisp1->isp.pad_cfg };
> >> ...
> >> - rkisp1->isp.pad_cfg
> >> + &state
> >> ...
> >> }
> >>
> >> // End of rockchip specific
> >>
> >> // Start of tegra-video specific
> >>
> >> @@
> >> identifier sd;
> >> identifier pad_cfg;
> >> @@
> >> __tegra_channel_try_format(...)
> >> {
> >> ...
> >> - struct v4l2_subdev_pad_config *pad_cfg;
> >> + struct v4l2_subdev_state *sd_state;
> >> ...
> >> - pad_cfg = v4l2_subdev_alloc_pad_config(sd);
> >> + sd_state = v4l2_subdev_alloc_state(sd);
> >> <...
> >> - pad_cfg
> >> + sd_state
> >> ...>
> >> - v4l2_subdev_free_pad_config(pad_cfg);
> >> + v4l2_subdev_free_state(sd_state);
> >> ...
> >> }
> >>
> >> @@
> >> identifier sd_state;
> >> @@
> >> __tegra_channel_try_format(...)
> >> {
> >> ...
> >> struct v4l2_subdev_state *sd_state;
> >> <...
> >> - sd_state->try_crop
> >> + sd_state->pads->try_crop
> >> ...>
> >> }
> >>
> >> // End of tegra-video specific
> >>
> >> // </smpl>
> >>
> >> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
> >> ---
> >> drivers/media/i2c/adv7170.c | 6 +-
> >> drivers/media/i2c/adv7175.c | 6 +-
> >> drivers/media/i2c/adv7180.c | 18 +--
> >> drivers/media/i2c/adv7183.c | 8 +-
> >> drivers/media/i2c/adv748x/adv748x-afe.c | 13 +-
> >> drivers/media/i2c/adv748x/adv748x-csi2.c | 14 +-
> >> drivers/media/i2c/adv748x/adv748x-hdmi.c | 13 +-
> >> drivers/media/i2c/adv7511-v4l2.c | 10 +-
> >> drivers/media/i2c/adv7604.c | 12 +-
> >> drivers/media/i2c/adv7842.c | 12 +-
> >> drivers/media/i2c/ak881x.c | 6 +-
> >> drivers/media/i2c/ccs/ccs-core.c | 84 ++++++-----
> >> drivers/media/i2c/cx25840/cx25840-core.c | 2 +-
> >> drivers/media/i2c/et8ek8/et8ek8_driver.c | 23 +--
> >> drivers/media/i2c/hi556.c | 15 +-
> >> drivers/media/i2c/imx214.c | 37 ++---
> >> drivers/media/i2c/imx219.c | 30 ++--
> >> drivers/media/i2c/imx258.c | 19 +--
> >> drivers/media/i2c/imx274.c | 32 ++--
> >> drivers/media/i2c/imx290.c | 20 +--
> >> drivers/media/i2c/imx319.c | 18 +--
> >> drivers/media/i2c/imx334.c | 18 +--
> >> drivers/media/i2c/imx355.c | 18 +--
> >> drivers/media/i2c/m5mols/m5mols_core.c | 21 ++-
> >> drivers/media/i2c/max9286.c | 17 ++-
> >> drivers/media/i2c/ml86v7667.c | 4 +-
> >> drivers/media/i2c/mt9m001.c | 18 +--
> >> drivers/media/i2c/mt9m032.c | 34 +++--
> >> drivers/media/i2c/mt9m111.c | 18 +--
> >> drivers/media/i2c/mt9p031.c | 45 +++---
> >> drivers/media/i2c/mt9t001.c | 44 +++---
> >> drivers/media/i2c/mt9t112.c | 14 +-
> >> drivers/media/i2c/mt9v011.c | 6 +-
> >> drivers/media/i2c/mt9v032.c | 44 +++---
> >> drivers/media/i2c/mt9v111.c | 23 +--
> >> drivers/media/i2c/noon010pc30.c | 19 ++-
> >> drivers/media/i2c/ov02a10.c | 17 ++-
> >> drivers/media/i2c/ov13858.c | 18 +--
> >> drivers/media/i2c/ov2640.c | 16 +-
> >> drivers/media/i2c/ov2659.c | 14 +-
> >> drivers/media/i2c/ov2680.c | 23 +--
> >> drivers/media/i2c/ov2685.c | 10 +-
> >> drivers/media/i2c/ov2740.c | 15 +-
> >> drivers/media/i2c/ov5640.c | 14 +-
> >> drivers/media/i2c/ov5645.c | 38 ++---
> >> drivers/media/i2c/ov5647.c | 26 ++--
> >> drivers/media/i2c/ov5648.c | 14 +-
> >> drivers/media/i2c/ov5670.c | 19 +--
> >> drivers/media/i2c/ov5675.c | 15 +-
> >> drivers/media/i2c/ov5695.c | 15 +-
> >> drivers/media/i2c/ov6650.c | 28 ++--
> >> drivers/media/i2c/ov7251.c | 39 ++---
> >> drivers/media/i2c/ov7670.c | 17 ++-
> >> drivers/media/i2c/ov772x.c | 12 +-
> >> drivers/media/i2c/ov7740.c | 17 ++-
> >> drivers/media/i2c/ov8856.c | 15 +-
> >> drivers/media/i2c/ov8865.c | 14 +-
> >> drivers/media/i2c/ov9640.c | 8 +-
> >> drivers/media/i2c/ov9650.c | 17 ++-
> >> drivers/media/i2c/ov9734.c | 15 +-
> >> drivers/media/i2c/rdacm20.c | 4 +-
> >> drivers/media/i2c/rdacm21.c | 4 +-
> >> drivers/media/i2c/rj54n1cb0c.c | 12 +-
> >> drivers/media/i2c/s5c73m3/s5c73m3-core.c | 55 +++----
> >> drivers/media/i2c/s5k4ecgx.c | 22 +--
> >> drivers/media/i2c/s5k5baf.c | 49 +++---
> >> drivers/media/i2c/s5k6a3.c | 19 ++-
> >> drivers/media/i2c/s5k6aa.c | 39 ++---
> >> drivers/media/i2c/saa6752hs.c | 6 +-
> >> drivers/media/i2c/saa7115.c | 2 +-
> >> drivers/media/i2c/saa717x.c | 2 +-
> >> drivers/media/i2c/sr030pc30.c | 8 +-
> >> drivers/media/i2c/st-mipid02.c | 21 +--
> >> drivers/media/i2c/tc358743.c | 8 +-
> >> drivers/media/i2c/tda1997x.c | 14 +-
> >> drivers/media/i2c/tvp514x.c | 6 +-
> >> drivers/media/i2c/tvp5150.c | 20 +--
> >> drivers/media/i2c/tvp7002.c | 11 +-
> >> drivers/media/i2c/tw9910.c | 10 +-
> >> drivers/media/i2c/vs6624.c | 8 +-
> >> drivers/media/pci/cx18/cx18-av-core.c | 2 +-
> >> drivers/media/pci/intel/ipu3/ipu3-cio2-main.c | 17 ++-
> >> drivers/media/pci/saa7134/saa7134-empress.c | 5 +-
> >> drivers/media/platform/atmel/atmel-isc-base.c | 19 ++-
> >> drivers/media/platform/atmel/atmel-isi.c | 19 ++-
> >> drivers/media/platform/cadence/cdns-csi2tx.c | 14 +-
> >> .../media/platform/exynos4-is/fimc-capture.c | 22 +--
> >> drivers/media/platform/exynos4-is/fimc-isp.c | 37 +++--
> >> drivers/media/platform/exynos4-is/fimc-lite.c | 39 ++---
> >> drivers/media/platform/exynos4-is/mipi-csis.c | 17 ++-
> >> .../media/platform/marvell-ccic/mcam-core.c | 5 +-
> >> drivers/media/platform/omap3isp/ispccdc.c | 85 ++++++-----
> >> drivers/media/platform/omap3isp/ispccp2.c | 41 ++---
> >> drivers/media/platform/omap3isp/ispcsi2.c | 41 ++---
> >> drivers/media/platform/omap3isp/isppreview.c | 69 +++++----
> >> drivers/media/platform/omap3isp/ispresizer.c | 70 +++++----
> >> drivers/media/platform/pxa_camera.c | 5 +-
> >> .../media/platform/qcom/camss/camss-csid.c | 35 ++---
> >> .../media/platform/qcom/camss/camss-csiphy.c | 40 ++---
> >> .../media/platform/qcom/camss/camss-ispif.c | 36 ++---
> >> drivers/media/platform/qcom/camss/camss-vfe.c | 84 ++++++-----
> >> drivers/media/platform/rcar-vin/rcar-csi2.c | 8 +-
> >> drivers/media/platform/rcar-vin/rcar-v4l2.c | 10 +-
> >> drivers/media/platform/renesas-ceu.c | 7 +-
> >> .../platform/rockchip/rkisp1/rkisp1-isp.c | 112 ++++++++------
> >> .../platform/rockchip/rkisp1/rkisp1-resizer.c | 95 +++++++-----
> >> .../media/platform/s3c-camif/camif-capture.c | 18 +--
> >> drivers/media/platform/stm32/stm32-dcmi.c | 14 +-
> >> .../platform/sunxi/sun4i-csi/sun4i_v4l2.c | 16 +-
> >> drivers/media/platform/ti-vpe/cal-camerarx.c | 35 +++--
> >> drivers/media/platform/via-camera.c | 5 +-
> >> drivers/media/platform/video-mux.c | 22 +--
> >> drivers/media/platform/vsp1/vsp1_brx.c | 34 +++--
> >> drivers/media/platform/vsp1/vsp1_clu.c | 13 +-
> >> drivers/media/platform/vsp1/vsp1_entity.c | 53 +++----
> >> drivers/media/platform/vsp1/vsp1_entity.h | 20 +--
> >> drivers/media/platform/vsp1/vsp1_histo.c | 51 ++++---
> >> drivers/media/platform/vsp1/vsp1_hsit.c | 14 +-
> >> drivers/media/platform/vsp1/vsp1_lif.c | 13 +-
> >> drivers/media/platform/vsp1/vsp1_lut.c | 13 +-
> >> drivers/media/platform/vsp1/vsp1_rwpf.c | 32 ++--
> >> drivers/media/platform/vsp1/vsp1_rwpf.h | 2 +-
> >> drivers/media/platform/vsp1/vsp1_sru.c | 22 +--
> >> drivers/media/platform/vsp1/vsp1_uds.c | 22 +--
> >> drivers/media/platform/vsp1/vsp1_uif.c | 27 ++--
> >> .../media/platform/xilinx/xilinx-csi2rxss.c | 20 +--
> >> drivers/media/platform/xilinx/xilinx-tpg.c | 25 ++--
> >> drivers/media/platform/xilinx/xilinx-vip.c | 8 +-
> >> drivers/media/platform/xilinx/xilinx-vip.h | 4 +-
> >> .../media/test-drivers/vimc/vimc-debayer.c | 20 +--
> >> drivers/media/test-drivers/vimc/vimc-scaler.c | 36 ++---
> >> drivers/media/test-drivers/vimc/vimc-sensor.c | 16 +-
> >> drivers/media/usb/go7007/s2250-board.c | 2 +-
> >> drivers/media/v4l2-core/v4l2-subdev.c | 141 ++++++++++--------
> >> .../media/atomisp/i2c/atomisp-gc0310.c | 10 +-
> >> .../media/atomisp/i2c/atomisp-gc2235.c | 10 +-
> >> .../media/atomisp/i2c/atomisp-mt9m114.c | 12 +-
> >> .../media/atomisp/i2c/atomisp-ov2680.c | 10 +-
> >> .../media/atomisp/i2c/atomisp-ov2722.c | 10 +-
> >> .../media/atomisp/i2c/ov5693/atomisp-ov5693.c | 10 +-
> >> .../staging/media/atomisp/pci/atomisp_cmd.c | 33 ++--
> >> .../staging/media/atomisp/pci/atomisp_csi2.c | 28 ++--
> >> .../staging/media/atomisp/pci/atomisp_csi2.h | 2 +-
> >> .../staging/media/atomisp/pci/atomisp_file.c | 14 +-
> >> .../staging/media/atomisp/pci/atomisp_fops.c | 6 +-
> >> .../media/atomisp/pci/atomisp_subdev.c | 64 ++++----
> >> .../media/atomisp/pci/atomisp_subdev.h | 9 +-
> >> .../staging/media/atomisp/pci/atomisp_tpg.c | 12 +-
> >> drivers/staging/media/imx/imx-ic-prp.c | 19 +--
> >> drivers/staging/media/imx/imx-ic-prpencvf.c | 31 ++--
> >> drivers/staging/media/imx/imx-media-csi.c | 82 +++++-----
> >> drivers/staging/media/imx/imx-media-utils.c | 4 +-
> >> drivers/staging/media/imx/imx-media-vdic.c | 24 +--
> >> drivers/staging/media/imx/imx-media.h | 2 +-
> >> drivers/staging/media/imx/imx6-mipi-csi2.c | 12 +-
> >> drivers/staging/media/imx/imx7-media-csi.c | 33 ++--
> >> drivers/staging/media/imx/imx7-mipi-csis.c | 34 +++--
> >> drivers/staging/media/ipu3/ipu3-v4l2.c | 26 ++--
> >> drivers/staging/media/omap4iss/iss_csi2.c | 37 ++---
> >> drivers/staging/media/omap4iss/iss_ipipe.c | 37 ++---
> >> drivers/staging/media/omap4iss/iss_ipipeif.c | 47 +++---
> >> drivers/staging/media/omap4iss/iss_resizer.c | 39 ++---
> >> drivers/staging/media/tegra-video/csi.c | 10 +-
> >> drivers/staging/media/tegra-video/vi.c | 24 +--
> >> include/media/v4l2-subdev.h | 72 +++++----
> >> 165 files changed, 2123 insertions(+), 1769 deletions(-)
> >
> > [snip]
> >
> > Skipping the drivers, or the mail won't make it to the list (and I'm not
> > sure I'd survive the process anyway).
> >
> >> diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
> >> index 956dafab43d4..bd996dcace3b 100644
> >> --- a/drivers/media/v4l2-core/v4l2-subdev.c
> >> +++ b/drivers/media/v4l2-core/v4l2-subdev.c
> >> @@ -26,19 +26,21 @@
> >> #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
> >> static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
> >> {
> >> - if (sd->entity.num_pads) {
> >> - fh->pad = v4l2_subdev_alloc_pad_config(sd);
> >> - if (fh->pad == NULL)
> >> - return -ENOMEM;
> >> - }
> >> + struct v4l2_subdev_state *state;
> >> +
> >> + state = v4l2_subdev_alloc_state(sd);
> >> + if (IS_ERR(state))
> >> + return PTR_ERR(state);
> >> +
> >> + fh->state = state;
> >>
> >> return 0;
> >> }
> >>
> >> static void subdev_fh_free(struct v4l2_subdev_fh *fh)
> >> {
> >> - v4l2_subdev_free_pad_config(fh->pad);
> >> - fh->pad = NULL;
> >> + v4l2_subdev_free_state(fh->state);
> >> + fh->state = NULL;
> >> }
> >>
> >> static int subdev_open(struct file *file)
> >> @@ -146,63 +148,63 @@ static inline int check_pad(struct v4l2_subdev *sd, u32 pad)
> >> return 0;
> >> }
> >>
> >> -static int check_cfg(u32 which, struct v4l2_subdev_pad_config *cfg)
> >> +static int check_cfg(u32 which, struct v4l2_subdev_state *state)
> >> {
> >> - if (which == V4L2_SUBDEV_FORMAT_TRY && !cfg)
> >> + if (which == V4L2_SUBDEV_FORMAT_TRY && !state)
> >> return -EINVAL;
> >>
> >> return 0;
> >> }
> >>
> >> static inline int check_format(struct v4l2_subdev *sd,
> >> - struct v4l2_subdev_pad_config *cfg,
> >> + struct v4l2_subdev_state *state,
> >> struct v4l2_subdev_format *format)
> >> {
> >> if (!format)
> >> return -EINVAL;
> >>
> >> return check_which(format->which) ? : check_pad(sd, format->pad) ? :
> >> - check_cfg(format->which, cfg);
> >> + check_cfg(format->which, state);
> >> }
> >>
> >> static int call_get_fmt(struct v4l2_subdev *sd,
> >> - struct v4l2_subdev_pad_config *cfg,
> >> + struct v4l2_subdev_state *state,
> >> struct v4l2_subdev_format *format)
> >> {
> >> - return check_format(sd, cfg, format) ? :
> >> - sd->ops->pad->get_fmt(sd, cfg, format);
> >> + return check_format(sd, state, format) ? :
> >> + sd->ops->pad->get_fmt(sd, state, format);
> >> }
> >>
> >> static int call_set_fmt(struct v4l2_subdev *sd,
> >> - struct v4l2_subdev_pad_config *cfg,
> >> + struct v4l2_subdev_state *state,
> >> struct v4l2_subdev_format *format)
> >> {
> >> - return check_format(sd, cfg, format) ? :
> >> - sd->ops->pad->set_fmt(sd, cfg, format);
> >> + return check_format(sd, state, format) ? :
> >> + sd->ops->pad->set_fmt(sd, state, format);
> >> }
> >>
> >> static int call_enum_mbus_code(struct v4l2_subdev *sd,
> >> - struct v4l2_subdev_pad_config *cfg,
> >> + struct v4l2_subdev_state *state,
> >> struct v4l2_subdev_mbus_code_enum *code)
> >> {
> >> if (!code)
> >> return -EINVAL;
> >>
> >> return check_which(code->which) ? : check_pad(sd, code->pad) ? :
> >> - check_cfg(code->which, cfg) ? :
> >> - sd->ops->pad->enum_mbus_code(sd, cfg, code);
> >> + check_cfg(code->which, state) ? :
> >> + sd->ops->pad->enum_mbus_code(sd, state, code);
> >> }
> >>
> >> static int call_enum_frame_size(struct v4l2_subdev *sd,
> >> - struct v4l2_subdev_pad_config *cfg,
> >> + struct v4l2_subdev_state *state,
> >> struct v4l2_subdev_frame_size_enum *fse)
> >> {
> >> if (!fse)
> >> return -EINVAL;
> >>
> >> return check_which(fse->which) ? : check_pad(sd, fse->pad) ? :
> >> - check_cfg(fse->which, cfg) ? :
> >> - sd->ops->pad->enum_frame_size(sd, cfg, fse);
> >> + check_cfg(fse->which, state) ? :
> >> + sd->ops->pad->enum_frame_size(sd, state, fse);
> >> }
> >>
> >> static inline int check_frame_interval(struct v4l2_subdev *sd,
> >> @@ -229,42 +231,42 @@ static int call_s_frame_interval(struct v4l2_subdev *sd,
> >> }
> >>
> >> static int call_enum_frame_interval(struct v4l2_subdev *sd,
> >> - struct v4l2_subdev_pad_config *cfg,
> >> + struct v4l2_subdev_state *state,
> >> struct v4l2_subdev_frame_interval_enum *fie)
> >> {
> >> if (!fie)
> >> return -EINVAL;
> >>
> >> return check_which(fie->which) ? : check_pad(sd, fie->pad) ? :
> >> - check_cfg(fie->which, cfg) ? :
> >> - sd->ops->pad->enum_frame_interval(sd, cfg, fie);
> >> + check_cfg(fie->which, state) ? :
> >> + sd->ops->pad->enum_frame_interval(sd, state, fie);
> >> }
> >>
> >> static inline int check_selection(struct v4l2_subdev *sd,
> >> - struct v4l2_subdev_pad_config *cfg,
> >> + struct v4l2_subdev_state *state,
> >> struct v4l2_subdev_selection *sel)
> >> {
> >> if (!sel)
> >> return -EINVAL;
> >>
> >> return check_which(sel->which) ? : check_pad(sd, sel->pad) ? :
> >> - check_cfg(sel->which, cfg);
> >> + check_cfg(sel->which, state);
> >> }
> >>
> >> static int call_get_selection(struct v4l2_subdev *sd,
> >> - struct v4l2_subdev_pad_config *cfg,
> >> + struct v4l2_subdev_state *state,
> >> struct v4l2_subdev_selection *sel)
> >> {
> >> - return check_selection(sd, cfg, sel) ? :
> >> - sd->ops->pad->get_selection(sd, cfg, sel);
> >> + return check_selection(sd, state, sel) ? :
> >> + sd->ops->pad->get_selection(sd, state, sel);
> >> }
> >>
> >> static int call_set_selection(struct v4l2_subdev *sd,
> >> - struct v4l2_subdev_pad_config *cfg,
> >> + struct v4l2_subdev_state *state,
> >> struct v4l2_subdev_selection *sel)
> >> {
> >> - return check_selection(sd, cfg, sel) ? :
> >> - sd->ops->pad->set_selection(sd, cfg, sel);
> >> + return check_selection(sd, state, sel) ? :
> >> + sd->ops->pad->set_selection(sd, state, sel);
> >> }
> >>
> >> static inline int check_edid(struct v4l2_subdev *sd,
> >> @@ -506,7 +508,7 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
> >>
> >> memset(format->reserved, 0, sizeof(format->reserved));
> >> memset(format->format.reserved, 0, sizeof(format->format.reserved));
> >> - return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh->pad, format);
> >> + return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh->state, format);
> >> }
> >>
> >> case VIDIOC_SUBDEV_S_FMT: {
> >> @@ -517,7 +519,7 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
> >>
> >> memset(format->reserved, 0, sizeof(format->reserved));
> >> memset(format->format.reserved, 0, sizeof(format->format.reserved));
> >> - return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh->pad, format);
> >> + return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh->state, format);
> >> }
> >>
> >> case VIDIOC_SUBDEV_G_CROP: {
> >> @@ -531,7 +533,7 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
> >> sel.target = V4L2_SEL_TGT_CROP;
> >>
> >> rval = v4l2_subdev_call(
> >> - sd, pad, get_selection, subdev_fh->pad, &sel);
> >> + sd, pad, get_selection, subdev_fh->state, &sel);
> >>
> >> crop->rect = sel.r;
> >>
> >> @@ -553,7 +555,7 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
> >> sel.r = crop->rect;
> >>
> >> rval = v4l2_subdev_call(
> >> - sd, pad, set_selection, subdev_fh->pad, &sel);
> >> + sd, pad, set_selection, subdev_fh->state, &sel);
> >>
> >> crop->rect = sel.r;
> >>
> >> @@ -564,7 +566,7 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
> >> struct v4l2_subdev_mbus_code_enum *code = arg;
> >>
> >> memset(code->reserved, 0, sizeof(code->reserved));
> >> - return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh->pad,
> >> + return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh->state,
> >> code);
> >> }
> >>
> >> @@ -572,7 +574,7 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
> >> struct v4l2_subdev_frame_size_enum *fse = arg;
> >>
> >> memset(fse->reserved, 0, sizeof(fse->reserved));
> >> - return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh->pad,
> >> + return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh->state,
> >> fse);
> >> }
> >>
> >> @@ -597,7 +599,7 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
> >> struct v4l2_subdev_frame_interval_enum *fie = arg;
> >>
> >> memset(fie->reserved, 0, sizeof(fie->reserved));
> >> - return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh->pad,
> >> + return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh->state,
> >> fie);
> >> }
> >>
> >> @@ -606,7 +608,7 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
> >>
> >> memset(sel->reserved, 0, sizeof(sel->reserved));
> >> return v4l2_subdev_call(
> >> - sd, pad, get_selection, subdev_fh->pad, sel);
> >> + sd, pad, get_selection, subdev_fh->state, sel);
> >> }
> >>
> >> case VIDIOC_SUBDEV_S_SELECTION: {
> >> @@ -617,7 +619,7 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
> >>
> >> memset(sel->reserved, 0, sizeof(sel->reserved));
> >> return v4l2_subdev_call(
> >> - sd, pad, set_selection, subdev_fh->pad, sel);
> >> + sd, pad, set_selection, subdev_fh->state, sel);
> >> }
> >>
> >> case VIDIOC_G_EDID: {
> >> @@ -892,35 +894,50 @@ int v4l2_subdev_link_validate(struct media_link *link)
> >> }
> >> EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
> >>
> >> -struct v4l2_subdev_pad_config *
> >> -v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd)
> >> +struct v4l2_subdev_state *v4l2_subdev_alloc_state(struct v4l2_subdev *sd)
> >> {
> >> - struct v4l2_subdev_pad_config *cfg;
> >> + struct v4l2_subdev_state *state;
> >> int ret;
> >>
> >> - if (!sd->entity.num_pads)
> >> - return NULL;
> >> -
> >> - cfg = kvmalloc_array(sd->entity.num_pads, sizeof(*cfg),
> >> - GFP_KERNEL | __GFP_ZERO);
> >> - if (!cfg)
> >> - return NULL;
> >> + state = kzalloc(sizeof(*state), GFP_KERNEL);
> >> + if (!state) {
> >> + ret = -ENOMEM;
> >> + goto err;
> >
> > You can return ERR_PTR(-ENOMEM) directly.
> >
> >> + }
> >>
> >> - ret = v4l2_subdev_call(sd, pad, init_cfg, cfg);
> >> - if (ret < 0 && ret != -ENOIOCTLCMD) {
> >> - kvfree(cfg);
> >> - return NULL;
> >> + if (sd->entity.num_pads) {
> >> + state->pads = kvmalloc_array(sd->entity.num_pads,
> >> + sizeof(*state->pads),
> >> + GFP_KERNEL | __GFP_ZERO);
> >> + if (!state->pads) {
> >> + ret = -ENOMEM;
> >> + goto err;
> >> + }
> >> }
> >>
> >> - return cfg;
> >> + ret = v4l2_subdev_call(sd, pad, init_cfg, state);
> >> + if (ret < 0 && ret != -ENOIOCTLCMD)
> >> + goto err;
> >> +
> >> + return state;
> >> +
> >> +err:
> >> + if (state && state->pads)
> >> + kvfree(state->pads);
> >> +
> >> + kfree(state);
> >> +
> >> + return ERR_PTR(ret);
> >> }
> >> -EXPORT_SYMBOL_GPL(v4l2_subdev_alloc_pad_config);
> >> +EXPORT_SYMBOL_GPL(v4l2_subdev_alloc_state);
> >>
> >> -void v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config *cfg)
> >> +void v4l2_subdev_free_state(struct v4l2_subdev_state *state)
> >> {
> >> - kvfree(cfg);
> >> + kvfree(state->pads);
> >> + kvfree(state);
> >
> > state was allocated with kzalloc(), this should be kfree().
> >
> >> }
> >> -EXPORT_SYMBOL_GPL(v4l2_subdev_free_pad_config);
> >> +EXPORT_SYMBOL_GPL(v4l2_subdev_free_state);
> >> +
> >> #endif /* CONFIG_MEDIA_CONTROLLER */
> >>
> >> void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
> >
> > [snip]
> >
> >> diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
> >> index d0e9a5bdb08b..79f9932d2b00 100644
> >> --- a/include/media/v4l2-subdev.h
> >> +++ b/include/media/v4l2-subdev.h
> >> @@ -623,6 +623,19 @@ struct v4l2_subdev_pad_config {
> >> struct v4l2_rect try_compose;
> >> };
> >>
> >> +/**
> >> + * struct v4l2_subdev_state - Used for storing subdev information.
> >
> > s/information/state information/
> >
> >> + *
> >> + * @pads: &struct v4l2_subdev_pad_config array
> >> + *
> >> + * This structure only needs to be passed to the pad op if the 'which' field
> >> + * of the main argument is set to %V4L2_SUBDEV_FORMAT_TRY. For
> >> + * %V4L2_SUBDEV_FORMAT_ACTIVE it is safe to pass %NULL.
> >
> > We should fix this by storing an instance of v4l2_subdev_state in
> > v4l2_subdev (on top of this patch).
>
> Probably, although I fear it might open a can of worms. We'll then have
> the situation where active formats are stored in v4l2_subdev _and_ in
> the driver's own struct,
Drivers should do one or the other, and I think they should transition
over time (at least new drivers should use the new mechanism).
> and also I'm pretty sure there are drivers that
> do funny stuff in get_fmt etc.
And maybe they shouldn't ;-) If drivers change formats and selection
rectangles autonomously, then the existing API is racy as by the time
.get_fmt() returns the format may be stale already.
> Maybe this could be made explicit and handled with a subdev flag,
> indicating that this driver supports the state in v4l2_subdev (and if
> not, the state pointer in v4l2_subdev would be null).
That, or implementing .get_fmt() using a helper provided by the core
that reads the format from the subsdev state.
For selection rectangles, we'll have to handle the different targets
(bounds and default, for both crop and compose).
> It also bring up the question of locking, as currently get_fmt can do
> any kind of locking it needs (or anything else it needs to have a valid
> fmt), whereas if the state is stored in v4l2_subdev, we must define when
> it is ok to change it and when to read it.
I think that's an upside actually, forcing us to clarify the locking
model.
> >> + */
> >> +struct v4l2_subdev_state {
> >> + struct v4l2_subdev_pad_config *pads;
> >> +};
> >> +
> >> /**
> >> * struct v4l2_subdev_pad_ops - v4l2-subdev pad level operations
> >> *
> >> @@ -687,27 +700,27 @@ struct v4l2_subdev_pad_config {
> >> */
> >> struct v4l2_subdev_pad_ops {
> >> int (*init_cfg)(struct v4l2_subdev *sd,
> >> - struct v4l2_subdev_pad_config *cfg);
> >> + struct v4l2_subdev_state *state);
> >> int (*enum_mbus_code)(struct v4l2_subdev *sd,
> >> - struct v4l2_subdev_pad_config *cfg,
> >> + struct v4l2_subdev_state *state,
> >> struct v4l2_subdev_mbus_code_enum *code);
> >> int (*enum_frame_size)(struct v4l2_subdev *sd,
> >> - struct v4l2_subdev_pad_config *cfg,
> >> + struct v4l2_subdev_state *state,
> >> struct v4l2_subdev_frame_size_enum *fse);
> >> int (*enum_frame_interval)(struct v4l2_subdev *sd,
> >> - struct v4l2_subdev_pad_config *cfg,
> >> + struct v4l2_subdev_state *state,
> >> struct v4l2_subdev_frame_interval_enum *fie);
> >> int (*get_fmt)(struct v4l2_subdev *sd,
> >> - struct v4l2_subdev_pad_config *cfg,
> >> + struct v4l2_subdev_state *state,
> >> struct v4l2_subdev_format *format);
> >> int (*set_fmt)(struct v4l2_subdev *sd,
> >> - struct v4l2_subdev_pad_config *cfg,
> >> + struct v4l2_subdev_state *state,
> >> struct v4l2_subdev_format *format);
> >> int (*get_selection)(struct v4l2_subdev *sd,
> >> - struct v4l2_subdev_pad_config *cfg,
> >> + struct v4l2_subdev_state *state,
> >> struct v4l2_subdev_selection *sel);
> >> int (*set_selection)(struct v4l2_subdev *sd,
> >> - struct v4l2_subdev_pad_config *cfg,
> >> + struct v4l2_subdev_state *state,
> >> struct v4l2_subdev_selection *sel);
> >> int (*get_edid)(struct v4l2_subdev *sd, struct v4l2_edid *edid);
> >> int (*set_edid)(struct v4l2_subdev *sd, struct v4l2_edid *edid);
> >> @@ -918,14 +931,14 @@ struct v4l2_subdev {
> >> * struct v4l2_subdev_fh - Used for storing subdev information per file handle
> >> *
> >> * @vfh: pointer to &struct v4l2_fh
> >> - * @pad: pointer to &struct v4l2_subdev_pad_config
> >> + * @state: pointer to &struct v4l2_subdev_state
> >> * @owner: module pointer to the owner of this file handle
> >> */
> >> struct v4l2_subdev_fh {
> >> struct v4l2_fh vfh;
> >> struct module *owner;
> >> #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
> >> - struct v4l2_subdev_pad_config *pad;
> >> + struct v4l2_subdev_state *state;
> >
> > I'd expect the v4l2_subdev_state structure to remain small, as it will
> > mostly contains a few pointers. Should we embed it in v4l2_subdev_fh
> > instead of allocating it separately ?
>
> That's what I initially had, but I changed it after someone commented:
>
> > I have a feeling we may be better off allocating states dynamically
> > (storing a pointer in v4l2_subdev_fh instead of embedding an
> > instance), in which case v4l2_subdev_state_alloc() and
> > v4l2_subdev_state_free() would be better
>
> I changed it, as it did make the life-cycle of the state more obvious,
> and also because the state grows a bit with the routing and stream patches.
>
> If we have the state in v4l2_subdev, and that one is a pointer (to allow
> null), maybe it's easier to keep it as a pointer in the v4l2_subdev_fh too.
>
> I don't have a strong opinion on this, except that I don't want to
> change anything in this patch unless really needed, as it's a PITA to
> update the semantic patch =).
:-) I'm OK either way.
> >> #endif
> >> };
> >>
> >> @@ -945,17 +958,17 @@ struct v4l2_subdev_fh {
> >> * &struct v4l2_subdev_pad_config->try_fmt
> >> *
> >> * @sd: pointer to &struct v4l2_subdev
> >> - * @cfg: pointer to &struct v4l2_subdev_pad_config array.
> >> - * @pad: index of the pad in the @cfg array.
> >> + * @state: pointer to &struct v4l2_subdev_state.
> >> + * @pad: index of the pad in the @state array.
> >
> > @state isn't an array.
> >
> >> */
> >> static inline struct v4l2_mbus_framefmt *
> >> v4l2_subdev_get_try_format(struct v4l2_subdev *sd,
> >> - struct v4l2_subdev_pad_config *cfg,
> >> + struct v4l2_subdev_state *state,
> >> unsigned int pad)
> >> {
> >> if (WARN_ON(pad >= sd->entity.num_pads))
> >> pad = 0;
> >> - return &cfg[pad].try_fmt;
> >> + return &state->pads[pad].try_fmt;
> >
> > As the goal is to not limit the state to TRY formats but store it in the
> > v4l2_subdev structure too, I'd rename try_fmt to format.
> > v4l2_subdev_get_try_format() should then become
> > v4l2_subdev_state_get_oad_format() or something similar (likely in a
> > separate patch).
>
> Yes, there are plenty of opportunities to do more on top of this patch,
> especially renames. I did notice a few, but I didn't even try to go
> there as the patch is so huge already.
Sounds fair. Please record these somewhere so we can address them on
top.
> >> }
> >>
> >> /**
> >> @@ -963,17 +976,17 @@ v4l2_subdev_get_try_format(struct v4l2_subdev *sd,
> >> * &struct v4l2_subdev_pad_config->try_crop
> >> *
> >> * @sd: pointer to &struct v4l2_subdev
> >> - * @cfg: pointer to &struct v4l2_subdev_pad_config array.
> >> - * @pad: index of the pad in the @cfg array.
> >> + * @state: pointer to &struct v4l2_subdev_state.
> >> + * @pad: index of the pad in the @state array.
> >> */
> >> static inline struct v4l2_rect *
> >> v4l2_subdev_get_try_crop(struct v4l2_subdev *sd,
> >> - struct v4l2_subdev_pad_config *cfg,
> >> + struct v4l2_subdev_state *state,
> >> unsigned int pad)
> >> {
> >> if (WARN_ON(pad >= sd->entity.num_pads))
> >> pad = 0;
> >> - return &cfg[pad].try_crop;
> >> + return &state->pads[pad].try_crop;
> >> }
> >>
> >> /**
> >> @@ -981,17 +994,17 @@ v4l2_subdev_get_try_crop(struct v4l2_subdev *sd,
> >> * &struct v4l2_subdev_pad_config->try_compose
> >> *
> >> * @sd: pointer to &struct v4l2_subdev
> >> - * @cfg: pointer to &struct v4l2_subdev_pad_config array.
> >> - * @pad: index of the pad in the @cfg array.
> >> + * @state: pointer to &struct v4l2_subdev_state.
> >> + * @pad: index of the pad in the @state array.
> >> */
> >> static inline struct v4l2_rect *
> >> v4l2_subdev_get_try_compose(struct v4l2_subdev *sd,
> >> - struct v4l2_subdev_pad_config *cfg,
> >> + struct v4l2_subdev_state *state,
> >> unsigned int pad)
> >> {
> >> if (WARN_ON(pad >= sd->entity.num_pads))
> >> pad = 0;
> >> - return &cfg[pad].try_compose;
> >> + return &state->pads[pad].try_compose;
> >> }
> >>
> >> #endif
> >> @@ -1093,20 +1106,17 @@ int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
> >> int v4l2_subdev_link_validate(struct media_link *link);
> >>
> >> /**
> >> - * v4l2_subdev_alloc_pad_config - Allocates memory for pad config
> >> + * v4l2_subdev_alloc_state - allocate v4l2_subdev_state
> >> *
> >> - * @sd: pointer to struct v4l2_subdev
> >
> > Won't kerneldoc complain if not all parameters are documented ?
>
> Yes it does. I just missed it with the huge amount of warnings it spams.
>
> I've addressed the other issues you raised. Thanks for review!
>
> I'll send a v3 when we come to a conclusion on the pointer vs embedding.
--
Regards,
Laurent Pinchart
