Re: [PATCH v2 2/2] media: imx: vdic: Introduce mem2mem VDI deinterlacer driver

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Hi,

Le mercredi 24 juillet 2024 à 02:19 +0200, Marek Vasut a écrit :
> Introduce dedicated memory-to-memory IPUv3 VDI deinterlacer driver.
> Currently the IPUv3 can operate VDI in DIRECT mode, from sensor to
> memory. This only works for single stream, that is, one input from
> one camera is deinterlaced on the fly with a helper buffer in DRAM
> and the result is written into memory.
> 
> The i.MX6Q/QP does support up to four analog cameras via two IPUv3
> instances, each containing one VDI deinterlacer block. In order to
> deinterlace all four streams from all four analog cameras live, it
> is necessary to operate VDI in INDIRECT mode, where the interlaced
> streams are written to buffers in memory, and then deinterlaced in
> memory using VDI in INDIRECT memory-to-memory mode.
> 
> This driver also makes use of the IDMAC->VDI->IC->IDMAC data path
> to provide pixel format conversion from input YUV formats to both
> output YUV or RGB formats. The later is useful in case the data
> are imported into the GPU, which on this platform cannot directly
> sample YUV buffers.
> 
> This is derived from previous work by Steve Longerbeam and from the
> IPUv3 CSC Scaler mem2mem driver.
> 
> Signed-off-by: Marek Vasut <marex@xxxxxxx>
> ---
> Cc: Daniel Vetter <daniel@xxxxxxxx>
> Cc: David Airlie <airlied@xxxxxxxxx>
> Cc: Fabio Estevam <festevam@xxxxxxxxx>
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Cc: Helge Deller <deller@xxxxxx>
> Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
> Cc: Pengutronix Kernel Team <kernel@xxxxxxxxxxxxxx>
> Cc: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
> Cc: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
> Cc: Shawn Guo <shawnguo@xxxxxxxxxx>
> Cc: Steve Longerbeam <slongerbeam@xxxxxxxxx>
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Cc: imx@xxxxxxxxxxxxxxx
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Cc: linux-fbdev@xxxxxxxxxxxxxxx
> Cc: linux-media@xxxxxxxxxxxxxxx
> Cc: linux-staging@xxxxxxxxxxxxxxx
> ---
> V2: - Add complementary imx_media_mem2mem_vdic_uninit()
>     - Drop uninitiaized ret from ipu_mem2mem_vdic_device_run()
>     - Drop duplicate nbuffers assignment in ipu_mem2mem_vdic_queue_setup()
>     - Fix %u formatting string in ipu_mem2mem_vdic_queue_setup()
>     - Drop devm_*free from ipu_mem2mem_vdic_get_ipu_resources() fail path
>       and ipu_mem2mem_vdic_put_ipu_resources()
>     - Add missing video_device_release()
> ---
>  drivers/staging/media/imx/Makefile            |   2 +-
>  drivers/staging/media/imx/imx-media-dev.c     |  55 +
>  .../media/imx/imx-media-mem2mem-vdic.c        | 997 ++++++++++++++++++
>  drivers/staging/media/imx/imx-media.h         |  10 +
>  4 files changed, 1063 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/staging/media/imx/imx-media-mem2mem-vdic.c
> 
> diff --git a/drivers/staging/media/imx/Makefile b/drivers/staging/media/imx/Makefile
> index 330e0825f506b..0cad87123b590 100644
> --- a/drivers/staging/media/imx/Makefile
> +++ b/drivers/staging/media/imx/Makefile
> @@ -4,7 +4,7 @@ imx-media-common-objs := imx-media-capture.o imx-media-dev-common.o \
>  
>  imx6-media-objs := imx-media-dev.o imx-media-internal-sd.o \
>  	imx-ic-common.o imx-ic-prp.o imx-ic-prpencvf.o imx-media-vdic.o \
> -	imx-media-csc-scaler.o
> +	imx-media-mem2mem-vdic.o imx-media-csc-scaler.o
>  
>  imx6-media-csi-objs := imx-media-csi.o imx-media-fim.o
>  
> diff --git a/drivers/staging/media/imx/imx-media-dev.c b/drivers/staging/media/imx/imx-media-dev.c
> index be54dca11465d..a841fdb4c2394 100644
> --- a/drivers/staging/media/imx/imx-media-dev.c
> +++ b/drivers/staging/media/imx/imx-media-dev.c
> @@ -57,7 +57,52 @@ static int imx6_media_probe_complete(struct v4l2_async_notifier *notifier)
>  		goto unlock;
>  	}
>  
> +	imxmd->m2m_vdic[0] = imx_media_mem2mem_vdic_init(imxmd, 0);
> +	if (IS_ERR(imxmd->m2m_vdic[0])) {
> +		ret = PTR_ERR(imxmd->m2m_vdic[0]);
> +		imxmd->m2m_vdic[0] = NULL;
> +		goto unlock;
> +	}
> +
> +	/* MX6S/DL has one IPUv3, init second VDI only on MX6Q/QP */
> +	if (imxmd->ipu[1]) {
> +		imxmd->m2m_vdic[1] = imx_media_mem2mem_vdic_init(imxmd, 1);
> +		if (IS_ERR(imxmd->m2m_vdic[1])) {
> +			ret = PTR_ERR(imxmd->m2m_vdic[1]);
> +			imxmd->m2m_vdic[1] = NULL;
> +			goto uninit_vdi0;
> +		}
> +	}
> +
>  	ret = imx_media_csc_scaler_device_register(imxmd->m2m_vdev);
> +	if (ret)
> +		goto uninit_vdi1;
> +
> +	ret = imx_media_mem2mem_vdic_register(imxmd->m2m_vdic[0]);
> +	if (ret)
> +		goto unreg_csc;
> +
> +	/* MX6S/DL has one IPUv3, init second VDI only on MX6Q/QP */
> +	if (imxmd->ipu[1]) {
> +		ret = imx_media_mem2mem_vdic_register(imxmd->m2m_vdic[1]);
> +		if (ret)
> +			goto unreg_vdic;
> +	}
> +
> +	mutex_unlock(&imxmd->mutex);
> +	return ret;
> +
> +unreg_vdic:
> +	imx_media_mem2mem_vdic_unregister(imxmd->m2m_vdic[0]);
> +	imxmd->m2m_vdic[0] = NULL;
> +unreg_csc:
> +	imx_media_csc_scaler_device_unregister(imxmd->m2m_vdev);
> +	imxmd->m2m_vdev = NULL;
> +uninit_vdi1:
> +	if (imxmd->ipu[1])
> +		imx_media_mem2mem_vdic_uninit(imxmd->m2m_vdic[1]);
> +uninit_vdi0:
> +	imx_media_mem2mem_vdic_uninit(imxmd->m2m_vdic[0]);
>  unlock:
>  	mutex_unlock(&imxmd->mutex);
>  	return ret;
> @@ -108,6 +153,16 @@ static void imx_media_remove(struct platform_device *pdev)
>  
>  	v4l2_info(&imxmd->v4l2_dev, "Removing imx-media\n");
>  
> +	if (imxmd->m2m_vdic[1]) {	/* MX6Q/QP only */
> +		imx_media_mem2mem_vdic_unregister(imxmd->m2m_vdic[1]);
> +		imxmd->m2m_vdic[1] = NULL;
> +	}
> +
> +	if (imxmd->m2m_vdic[0]) {
> +		imx_media_mem2mem_vdic_unregister(imxmd->m2m_vdic[0]);
> +		imxmd->m2m_vdic[0] = NULL;
> +	}
> +
>  	if (imxmd->m2m_vdev) {
>  		imx_media_csc_scaler_device_unregister(imxmd->m2m_vdev);
>  		imxmd->m2m_vdev = NULL;
> diff --git a/drivers/staging/media/imx/imx-media-mem2mem-vdic.c b/drivers/staging/media/imx/imx-media-mem2mem-vdic.c
> new file mode 100644
> index 0000000000000..71c6c023d2bf8
> --- /dev/null
> +++ b/drivers/staging/media/imx/imx-media-mem2mem-vdic.c
> @@ -0,0 +1,997 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * i.MX VDIC mem2mem de-interlace driver
> + *
> + * Copyright (c) 2024 Marek Vasut <marex@xxxxxxx>
> + *
> + * Based on previous VDIC mem2mem work by Steve Longerbeam that is:
> + * Copyright (c) 2018 Mentor Graphics Inc.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/fs.h>
> +#include <linux/module.h>
> +#include <linux/sched.h>
> +#include <linux/slab.h>
> +#include <linux/version.h>
> +
> +#include <media/media-device.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/v4l2-mem2mem.h>
> +#include <media/videobuf2-dma-contig.h>
> +
> +#include "imx-media.h"
> +
> +#define fh_to_ctx(__fh)	container_of(__fh, struct ipu_mem2mem_vdic_ctx, fh)
> +
> +#define to_mem2mem_priv(v) container_of(v, struct ipu_mem2mem_vdic_priv, vdev)
> +
> +enum {
> +	V4L2_M2M_SRC = 0,
> +	V4L2_M2M_DST = 1,
> +};
> +
> +struct ipu_mem2mem_vdic_ctx;
> +
> +struct ipu_mem2mem_vdic_priv {
> +	struct imx_media_video_dev	vdev;
> +	struct imx_media_dev		*md;
> +	struct device			*dev;
> +	struct ipu_soc			*ipu_dev;
> +	int				ipu_id;
> +
> +	struct v4l2_m2m_dev		*m2m_dev;
> +	struct mutex			mutex;		/* mem2mem device mutex */
> +
> +	/* VDI resources */
> +	struct ipu_vdi			*vdi;
> +	struct ipu_ic			*ic;
> +	struct ipuv3_channel		*vdi_in_ch_p;
> +	struct ipuv3_channel		*vdi_in_ch;
> +	struct ipuv3_channel		*vdi_in_ch_n;
> +	struct ipuv3_channel		*vdi_out_ch;
> +	int				eof_irq;
> +	int				nfb4eof_irq;
> +	spinlock_t			irqlock;	/* protect eof_irq handler */
> +
> +	atomic_t			stream_count;
> +
> +	struct ipu_mem2mem_vdic_ctx	*curr_ctx;
> +
> +	struct v4l2_pix_format		fmt[2];
> +};
> +
> +struct ipu_mem2mem_vdic_ctx {
> +	struct ipu_mem2mem_vdic_priv	*priv;
> +	struct v4l2_fh			fh;
> +	unsigned int			sequence;
> +	struct vb2_v4l2_buffer		*prev_buf;
> +	struct vb2_v4l2_buffer		*curr_buf;
> +};
> +
> +static struct v4l2_pix_format *
> +ipu_mem2mem_vdic_get_format(struct ipu_mem2mem_vdic_priv *priv,
> +			    enum v4l2_buf_type type)
> +{
> +	return &priv->fmt[V4L2_TYPE_IS_OUTPUT(type) ? V4L2_M2M_SRC : V4L2_M2M_DST];
> +}


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