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Message-ID: <703509de-bc2a-0d4b-7ae7-a0c0efd98e41@xs4all.nl>
Date: Mon, 4 Jul 2016 11:23:15 +0200
From: Hans Verkuil <hverkuil@...all.nl>
To: Robert Jarzmik <robert.jarzmik@...e.fr>,
Guennadi Liakhovetski <g.liakhovetski@....de>,
Mauro Carvalho Chehab <mchehab@....samsung.com>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC v2 1/2] media: platform: transfer format translations
to soc_mediabus
On 04/02/2016 04:26 PM, Robert Jarzmik wrote:
> Transfer the formats translations to soc_mediabus. Even is soc_camera
> was to be deprecated, soc_mediabus will survive, and should describe all
> that happens on the bus connecting the image processing unit of the SoC
> and the sensor.
>
> The translation engine provides an easy way to compute the formats
> available in the v4l2 device, given any sensors format capabilities
> bound with known image processing transformations.
I prefer that you just make a copy of this for use in the pxa driver.
We might make this (or a variant) available for all drivers in the future,
but for now just split off the pxa driver without introducing new media
includes.
Regards,
Hans
>
> Signed-off-by: Robert Jarzmik <robert.jarzmik@...e.fr>
> ---
> drivers/media/platform/soc_camera/soc_camera.c | 7 +--
> drivers/media/platform/soc_camera/soc_mediabus.c | 65 ++++++++++++++++++++++++
> include/media/drv-intf/soc_mediabus.h | 22 ++++++++
> include/media/soc_camera.h | 15 ------
> 4 files changed, 88 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/media/platform/soc_camera/soc_camera.c b/drivers/media/platform/soc_camera/soc_camera.c
> index 46c7186f7867..039524a20056 100644
> --- a/drivers/media/platform/soc_camera/soc_camera.c
> +++ b/drivers/media/platform/soc_camera/soc_camera.c
> @@ -204,12 +204,7 @@ static void soc_camera_clock_stop(struct soc_camera_host *ici)
> const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
> struct soc_camera_device *icd, unsigned int fourcc)
> {
> - unsigned int i;
> -
> - for (i = 0; i < icd->num_user_formats; i++)
> - if (icd->user_formats[i].host_fmt->fourcc == fourcc)
> - return icd->user_formats + i;
> - return NULL;
> + return soc_mbus_xlate_by_fourcc(icd->user_formats, fourcc);
> }
> EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);
>
> diff --git a/drivers/media/platform/soc_camera/soc_mediabus.c b/drivers/media/platform/soc_camera/soc_mediabus.c
> index e3e665e1c503..95c13055f50f 100644
> --- a/drivers/media/platform/soc_camera/soc_mediabus.c
> +++ b/drivers/media/platform/soc_camera/soc_mediabus.c
> @@ -10,6 +10,7 @@
>
> #include <linux/kernel.h>
> #include <linux/module.h>
> +#include <linux/slab.h>
>
> #include <media/v4l2-device.h>
> #include <media/v4l2-mediabus.h>
> @@ -512,6 +513,70 @@ unsigned int soc_mbus_config_compatible(const struct v4l2_mbus_config *cfg,
> }
> EXPORT_SYMBOL(soc_mbus_config_compatible);
>
> +struct soc_camera_format_xlate *soc_mbus_build_fmts_xlate(
> + struct v4l2_device *v4l2_dev, struct v4l2_subdev *subdev,
> + int (*get_formats)(struct v4l2_device *, unsigned int,
> + struct soc_camera_format_xlate *xlate))
> +{
> + unsigned int i, fmts = 0, raw_fmts = 0;
> + int ret;
> + struct v4l2_subdev_mbus_code_enum code = {
> + .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> + };
> + struct soc_camera_format_xlate *user_formats;
> +
> + while (!v4l2_subdev_call(subdev, pad, enum_mbus_code, NULL, &code)) {
> + raw_fmts++;
> + code.index++;
> + }
> +
> + /*
> + * First pass - only count formats this host-sensor
> + * configuration can provide
> + */
> + for (i = 0; i < raw_fmts; i++) {
> + ret = get_formats(v4l2_dev, i, NULL);
> + if (ret < 0)
> + return ERR_PTR(ret);
> + fmts += ret;
> + }
> +
> + if (!fmts)
> + return ERR_PTR(-ENXIO);
> +
> + user_formats = kcalloc(fmts + 1, sizeof(*user_formats), GFP_KERNEL);
> + if (!user_formats)
> + return ERR_PTR(-ENOMEM);
> +
> + /* Second pass - actually fill data formats */
> + fmts = 0;
> + for (i = 0; i < raw_fmts; i++) {
> + ret = get_formats(v4l2_dev, i, user_formats + fmts);
> + if (ret < 0)
> + goto egfmt;
> + fmts += ret;
> + }
> + user_formats[fmts].code = 0;
> +
> + return user_formats;
> +egfmt:
> + kfree(user_formats);
> + return ERR_PTR(ret);
> +}
> +EXPORT_SYMBOL(soc_mbus_build_fmts_xlate);
> +
> +const struct soc_camera_format_xlate *soc_mbus_xlate_by_fourcc(
> + struct soc_camera_format_xlate *user_formats, unsigned int fourcc)
> +{
> + unsigned int i;
> +
> + for (i = 0; user_formats[i].code; i++)
> + if (user_formats[i].host_fmt->fourcc == fourcc)
> + return user_formats + i;
> + return NULL;
> +}
> +EXPORT_SYMBOL(soc_mbus_xlate_by_fourcc);
> +
> static int __init soc_mbus_init(void)
> {
> return 0;
> diff --git a/include/media/drv-intf/soc_mediabus.h b/include/media/drv-intf/soc_mediabus.h
> index 2ff773785fb6..08af52f6338c 100644
> --- a/include/media/drv-intf/soc_mediabus.h
> +++ b/include/media/drv-intf/soc_mediabus.h
> @@ -95,6 +95,21 @@ struct soc_mbus_lookup {
> struct soc_mbus_pixelfmt fmt;
> };
>
> +/**
> + * struct soc_camera_format_xlate - match between host and sensor formats
> + * @code: code of a sensor provided format
> + * @host_fmt: host format after host translation from code
> + *
> + * Host and sensor translation structure. Used in table of host and sensor
> + * formats matchings in soc_camera_device. A host can override the generic list
> + * generation by implementing get_formats(), and use it for format checks and
> + * format setup.
> + */
> +struct soc_camera_format_xlate {
> + u32 code;
> + const struct soc_mbus_pixelfmt *host_fmt;
> +};
> +
> const struct soc_mbus_pixelfmt *soc_mbus_find_fmtdesc(
> u32 code,
> const struct soc_mbus_lookup *lookup,
> @@ -108,5 +123,12 @@ int soc_mbus_samples_per_pixel(const struct soc_mbus_pixelfmt *mf,
> unsigned int *numerator, unsigned int *denominator);
> unsigned int soc_mbus_config_compatible(const struct v4l2_mbus_config *cfg,
> unsigned int flags);
> +struct soc_camera_format_xlate *soc_mbus_build_fmts_xlate(
> + struct v4l2_device *v4l2_dev, struct v4l2_subdev *subdev,
> + int (*get_formats)(struct v4l2_device *, unsigned int,
> + struct soc_camera_format_xlate *xlate));
> +const struct soc_camera_format_xlate *soc_mbus_xlate_by_fourcc(
> + struct soc_camera_format_xlate *user_formats, unsigned int fourcc);
> +
>
> #endif
> diff --git a/include/media/soc_camera.h b/include/media/soc_camera.h
> index 97aa13314bfd..db6ea91d5cb0 100644
> --- a/include/media/soc_camera.h
> +++ b/include/media/soc_camera.h
> @@ -285,21 +285,6 @@ void soc_camera_host_unregister(struct soc_camera_host *ici);
> const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
> struct soc_camera_device *icd, unsigned int fourcc);
>
> -/**
> - * struct soc_camera_format_xlate - match between host and sensor formats
> - * @code: code of a sensor provided format
> - * @host_fmt: host format after host translation from code
> - *
> - * Host and sensor translation structure. Used in table of host and sensor
> - * formats matchings in soc_camera_device. A host can override the generic list
> - * generation by implementing get_formats(), and use it for format checks and
> - * format setup.
> - */
> -struct soc_camera_format_xlate {
> - u32 code;
> - const struct soc_mbus_pixelfmt *host_fmt;
> -};
> -
> #define SOCAM_SENSE_PCLK_CHANGED (1 << 0)
>
> /**
>
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