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Date: Mon, 2 Sep 2019 14:19:59 +0200
From: Hans Verkuil <hverkuil@...all.nl>
To: Arthur Moraes do Lago <arthurmoraeslago@...il.com>,
helen.koike@...labora.com, mchehab@...nel.org,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
lkcamp@...ts.libreplanetbr.org
Subject: Re: [PATCH] media: vimc: Implement debayer control for mean window
size
On 9/1/19 9:40 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@...il.com>
> Signed-off-by: Laís Pessine do Carmo <laispc19@...il.com>
> Signed-off-by: Arthur Moraes do Lago <arthurmoraeslago@...il.com>
>
> ---
> This patch was made on top of Shuah Khan's patch (162623).
> Thanks.
> ---
> drivers/media/platform/vimc/vimc-common.h | 1 +
> drivers/media/platform/vimc/vimc-debayer.c | 81 ++++++++++++++++++----
> 2 files changed, 70 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/media/platform/vimc/vimc-common.h b/drivers/media/platform/vimc/vimc-common.h
> index 5b2282de395c..547ff04a415e 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 6cee911bf149..aa3edeed96bc 100644
> --- a/drivers/media/platform/vimc/vimc-debayer.c
> +++ b/drivers/media/platform/vimc/vimc-debayer.c
> @@ -11,17 +11,11 @@
> #include <linux/platform_device.h>
> #include <linux/vmalloc.h>
> #include <linux/v4l2-mediabus.h>
> +#include <media/v4l2-ctrls.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");
> -
> #define IS_SINK(pad) (!pad)
> #define IS_SRC(pad) (pad)
>
> @@ -49,6 +43,8 @@ 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 = {
> @@ -387,7 +383,7 @@ 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 */
>
> @@ -477,6 +473,33 @@ static void *vimc_deb_process_frame(struct vimc_ent_device *ved,
>
> }
>
> +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;
> + vdeb->mean_win_size = mean_win_size;
> +}
> +
> +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);
> + 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 =
> @@ -502,6 +525,24 @@ void vimc_deb_rm(struct vimc_device *vimc, struct vimc_ent_config *vcfg)
> 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 = "Mean window size",
Should be "Mean Window Size". We follow English capitalization rules for titles
for the control names.
> + .type = V4L2_CTRL_TYPE_INTEGER,
> + .min = 1,
> + .max = 99,
This seems unreasonably large. I'm not sure what is a typical maximum, but
I suspect it will be very much smaller than 99.
Make sure you do a streaming test with this control with both the min and max values.
Does v4l2-compliance pass?
Regards,
Hans
> + .step = 2,
> + .def = 3,
> +};
> +
> int vimc_deb_add(struct vimc_device *vimc, struct vimc_ent_config *vcfg)
> {
> struct v4l2_device *v4l2_dev = &vimc->v4l2_dev;
> @@ -513,6 +554,16 @@ int vimc_deb_add(struct vimc_device *vimc, struct vimc_ent_config *vcfg)
> if (!vdeb)
> return -ENOMEM;
>
> + /* 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,
> @@ -520,13 +571,12 @@ int vimc_deb_add(struct vimc_device *vimc, struct vimc_ent_config *vcfg)
> (const unsigned long[2]) {MEDIA_PAD_FL_SINK,
> MEDIA_PAD_FL_SOURCE},
> &vimc_deb_int_ops, &vimc_deb_ops);
> - if (ret) {
> - kfree(vdeb);
> - return ret;
> - }
> + 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;
> @@ -541,4 +591,11 @@ int vimc_deb_add(struct vimc_device *vimc, struct vimc_ent_config *vcfg)
>
> vcfg->ved = &vdeb->ved;
> return 0;
> +
> +err_free_hdl:
> + v4l2_ctrl_handler_free(&vdeb->hdl);
> +err_free_vdeb:
> + kfree(vdeb);
> +
> + return ret;
> }
>
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