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SubjectRe: [PATCH v3] media: vimc: Implement debayer control for mean window size
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Hi Arthur,

Thanks for the patch, just some small comments below.

On 9/24/19 8:21 PM, Arthur Moraes do Lago wrote:
> Add mean window size parameter for debayer filter as a control in
> vimc-debayer.
>
> vimc-debayer was patched to allow changing mean windows parameter
> of the filter without needing to reload the driver. The parameter
> can now be set using a v4l2-ctl control(mean_window_size).
>
> Co-developed-by: Laís Pessine do Carmo <laispc19@gmail.com>
> Signed-off-by: Laís Pessine do Carmo <laispc19@gmail.com>
> Signed-off-by: Arthur Moraes do Lago <arthurmoraeslago@gmail.com>
> ---
> Changes in V3:
> - Renamed debayer control
> - Fixed typo in documentation
> - Freed control handler in vimc_deb_release

It would be nicer if you could keep the whole change log here, to see what happened in v2 too.

>
> This commit is based on Shuah Khan's patch series 171283
> ("Collapse vimc single monolithic driver").
>
> Thanks.
> ---
> Documentation/media/v4l-drivers/vimc.rst | 10 +--
> drivers/media/platform/vimc/vimc-common.h | 1 +
> drivers/media/platform/vimc/vimc-debayer.c | 89 +++++++++++++++++++---
> 3 files changed, 79 insertions(+), 21 deletions(-)
>
> diff --git a/Documentation/media/v4l-drivers/vimc.rst b/Documentation/media/v4l-drivers/vimc.rst
> index a582af0509ee..28646c76dad5 100644
> --- a/Documentation/media/v4l-drivers/vimc.rst
> +++ b/Documentation/media/v4l-drivers/vimc.rst
> @@ -80,9 +80,7 @@ vimc-capture:
> Module options
> ---------------
>
> -Vimc has a few module parameters to configure the driver.
> -
> - param=value
> +Vimc has a module parameter to configure the driver.
>
> * ``sca_mult=<unsigned int>``
>
> @@ -91,12 +89,6 @@ Vimc has a few module parameters to configure the driver.
> original one. Currently, only supports scaling up (the default value
> is 3).
>
> -* ``deb_mean_win_size=<unsigned int>``
> -
> - Window size to calculate the mean. Note: the window size needs to be an
> - odd number, as the main pixel stays in the center of the window,
> - otherwise the next odd number is considered (the default value is 3).
> -
> Source code documentation
> -------------------------
>
> diff --git a/drivers/media/platform/vimc/vimc-common.h b/drivers/media/platform/vimc/vimc-common.h
> index 236412ad7548..3a5102ddf794 100644
> --- a/drivers/media/platform/vimc/vimc-common.h
> +++ b/drivers/media/platform/vimc/vimc-common.h
> @@ -19,6 +19,7 @@
> #define VIMC_CID_VIMC_BASE (0x00f00000 | 0xf000)
> #define VIMC_CID_VIMC_CLASS (0x00f00000 | 1)
> #define VIMC_CID_TEST_PATTERN (VIMC_CID_VIMC_BASE + 0)
> +#define VIMC_CID_MEAN_WIN_SIZE (VIMC_CID_VIMC_BASE + 1)
>
> #define VIMC_FRAME_MAX_WIDTH 4096
> #define VIMC_FRAME_MAX_HEIGHT 2160
> diff --git a/drivers/media/platform/vimc/vimc-debayer.c b/drivers/media/platform/vimc/vimc-debayer.c
> index 37f3767db469..f1fa7aa023a3 100644
> --- a/drivers/media/platform/vimc/vimc-debayer.c
> +++ b/drivers/media/platform/vimc/vimc-debayer.c
> @@ -11,17 +11,12 @@
> #include <linux/platform_device.h>
> #include <linux/vmalloc.h>
> #include <linux/v4l2-mediabus.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-event.h>
> #include <media/v4l2-subdev.h>
>
> #include "vimc-common.h"
>
> -static unsigned int deb_mean_win_size = 3;
> -module_param(deb_mean_win_size, uint, 0000);
> -MODULE_PARM_DESC(deb_mean_win_size, " the window size to calculate the mean.\n"
> - "NOTE: the window size needs to be an odd number, as the main pixel "
> - "stays in the center of the window, otherwise the next odd number "
> - "is considered");
> -
> enum vimc_deb_rgb_colors {
> VIMC_DEB_RED = 0,
> VIMC_DEB_GREEN = 1,
> @@ -46,6 +41,8 @@ struct vimc_deb_device {
> u8 *src_frame;
> const struct vimc_deb_pix_map *sink_pix_map;
> unsigned int sink_bpp;
> + unsigned int mean_win_size;
> + struct v4l2_ctrl_handler hdl;
> };
>
> static const struct v4l2_mbus_framefmt sink_fmt_default = {
> @@ -346,11 +343,18 @@ static int vimc_deb_s_stream(struct v4l2_subdev *sd, int enable)
> return 0;
> }
>
> +static const struct v4l2_subdev_core_ops vimc_deb_core_ops = {
> + .log_status = v4l2_ctrl_subdev_log_status,
> + .subscribe_event = v4l2_ctrl_subdev_subscribe_event,
> + .unsubscribe_event = v4l2_event_subdev_unsubscribe,
> +};
> +
> static const struct v4l2_subdev_video_ops vimc_deb_video_ops = {
> .s_stream = vimc_deb_s_stream,
> };
>
> static const struct v4l2_subdev_ops vimc_deb_ops = {
> + .core = &vimc_deb_core_ops,
> .pad = &vimc_deb_pad_ops,
> .video = &vimc_deb_video_ops,
> };
> @@ -384,7 +388,7 @@ static void vimc_deb_calc_rgb_sink(struct vimc_deb_device *vdeb,
> * the top left corner of the mean window (considering the current
> * pixel as the center)
> */
> - seek = deb_mean_win_size / 2;
> + seek = vdeb->mean_win_size / 2;
>
> /* Sum the values of the colors in the mean window */
>
> @@ -471,14 +475,41 @@ static void *vimc_deb_process_frame(struct vimc_ent_device *ved,
> }
>
> return vdeb->src_frame;
> +}
> +
> +static inline void vimc_deb_s_mean_win_size(struct vimc_deb_device *vdeb,
> + unsigned int mean_win_size)
> +{
> + if (vdeb->mean_win_size == mean_win_size)
> + return;

Why do you need this check, you could just directly assign it.

> + vdeb->mean_win_size = mean_win_size;
> +}

I don't think you need this function actually.

>
> +static int vimc_deb_s_ctrl(struct v4l2_ctrl *ctrl)
> +{
> + struct vimc_deb_device *vdeb =
> + container_of(ctrl->handler, struct vimc_deb_device, hdl);
> +
> + switch (ctrl->id) {
> + case VIMC_CID_MEAN_WIN_SIZE:
> + vimc_deb_s_mean_win_size(vdeb, ctrl->val);

You could just put the assignment directly here, what do you think?

Regards,
Helen

> + break;
> + default:
> + return -EINVAL;
> + }
> + return 0;
> }
>
> +static const struct v4l2_ctrl_ops vimc_deb_ctrl_ops = {
> + .s_ctrl = vimc_deb_s_ctrl,
> +};
> +
> static void vimc_deb_release(struct v4l2_subdev *sd)
> {
> struct vimc_deb_device *vdeb =
> container_of(sd, struct vimc_deb_device, sd);
>
> + v4l2_ctrl_handler_free(&vdeb->hdl);
> vimc_pads_cleanup(vdeb->ved.pads);
> kfree(vdeb);
> }
> @@ -495,6 +526,24 @@ void vimc_deb_rm(struct vimc_device *vimc, struct vimc_ent_device *ved)
> vimc_ent_sd_unregister(ved, &vdeb->sd);
> }
>
> +static const struct v4l2_ctrl_config vimc_deb_ctrl_class = {
> + .flags = V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY,
> + .id = VIMC_CID_VIMC_CLASS,
> + .name = "VIMC Controls",
> + .type = V4L2_CTRL_TYPE_CTRL_CLASS,
> +};
> +
> +static const struct v4l2_ctrl_config vimc_deb_ctrl_mean_win_size = {
> + .ops = &vimc_deb_ctrl_ops,
> + .id = VIMC_CID_MEAN_WIN_SIZE,
> + .name = "Debayer Mean Window Size",
> + .type = V4L2_CTRL_TYPE_INTEGER,
> + .min = 1,
> + .max = 25,
> + .step = 2,
> + .def = 3,
> +};
> +
> struct vimc_ent_device *vimc_deb_add(struct vimc_device *vimc,
> const char *vcfg_name)
> {
> @@ -507,6 +556,16 @@ struct vimc_ent_device *vimc_deb_add(struct vimc_device *vimc,
> if (!vdeb)
> return NULL;
>
> + /* Create controls: */
> + v4l2_ctrl_handler_init(&vdeb->hdl, 2);
> + v4l2_ctrl_new_custom(&vdeb->hdl, &vimc_deb_ctrl_class, NULL);
> + v4l2_ctrl_new_custom(&vdeb->hdl, &vimc_deb_ctrl_mean_win_size, NULL);
> + vdeb->sd.ctrl_handler = &vdeb->hdl;
> + if (vdeb->hdl.error) {
> + ret = vdeb->hdl.error;
> + goto err_free_vdeb;
> + }
> +
> /* Initialize ved and sd */
> ret = vimc_ent_sd_register(&vdeb->ved, &vdeb->sd, v4l2_dev,
> vcfg_name,
> @@ -514,13 +573,12 @@ struct vimc_ent_device *vimc_deb_add(struct vimc_device *vimc,
> (const unsigned long[2]) {MEDIA_PAD_FL_SINK,
> MEDIA_PAD_FL_SOURCE},
> &vimc_deb_int_ops, &vimc_deb_ops);
> - if (ret) {
> - kfree(vdeb);
> - return NULL;
> - }
> + if (ret)
> + goto err_free_hdl;
>
> vdeb->ved.process_frame = vimc_deb_process_frame;
> vdeb->dev = &vimc->pdev.dev;
> + vdeb->mean_win_size = vimc_deb_ctrl_mean_win_size.def;
>
> /* Initialize the frame format */
> vdeb->sink_fmt = sink_fmt_default;
> @@ -534,4 +592,11 @@ struct vimc_ent_device *vimc_deb_add(struct vimc_device *vimc,
> vdeb->set_rgb_src = vimc_deb_set_rgb_mbus_fmt_rgb888_1x24;
>
> return &vdeb->ved;
> +
> +err_free_hdl:
> + v4l2_ctrl_handler_free(&vdeb->hdl);
> +err_free_vdeb:
> + kfree(vdeb);
> +
> + return NULL;
> }
>


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