[PATCH v8 16/16] media: ti: Add CSI2RX support for J721E
Jai Luthra
j-luthra at ti.com
Thu Aug 3 04:51:21 PDT 2023
Hi Tomi,
Thanks for the review.
On Aug 02, 2023 at 14:04:57 +0300, Tomi Valkeinen wrote:
> On 31/07/2023 11:29, Jai Luthra wrote:
> > From: Pratyush Yadav <p.yadav at ti.com>
> >
> > TI's J721E uses the Cadence CSI2RX and DPHY peripherals to facilitate
> > capture over a CSI-2 bus.
> >
> > The Cadence CSI2RX IP acts as a bridge between the TI specific parts and
> > the CSI-2 protocol parts. TI then has a wrapper on top of this bridge
> > called the SHIM layer. It takes in data from stream 0, repacks it, and
> > sends it to memory over PSI-L DMA.
> >
> > This driver acts as the "front end" to V4L2 client applications. It
> > implements the required ioctls and buffer operations, passes the
> > necessary calls on to the bridge, programs the SHIM layer, and performs
> > DMA via the dmaengine API to finally return the data to a buffer
> > supplied by the application.
> >
> > Signed-off-by: Pratyush Yadav <p.yadav at ti.com>
> > Co-authored-by: Vaishnav Achath <vaishnav.a at ti.com>
> > Signed-off-by: Vaishnav Achath <vaishnav.a at ti.com>
> > Co-authored-by: Jai Luthra <j-luthra at ti.com>
> > Signed-off-by: Jai Luthra <j-luthra at ti.com>
> > ---
> > v7->v8:
> > - Move after dt-bindings to keep the series bisectable
> > - Rename compatible to "ti,j721e-csi2rx-shim" to distinguish from the
> > SoC-specific CSI2RX bridge compatible
> > - Make myself the Maintainer
> > - Support RAW8 and RAW10 formats, and setting the pixel-unwrap size on
> > SHIM (RAW10 is stored in 16-bit containers, while RAW8 in 8-bit containers)
> > - Fix enum_fmt_vid_cap() to respect CAP_IO_MC and only list pixelformats
> > matching the mbus formats set on the subdev.
> > - Fix enum_framesizes() to stop enumerating more than a single framesize
> > (reject non-zero fsize->index)
> > - Simplify notifier bound fucntion to use v4l2_create_fwnode_links_to_pad()
> > and inline the video_register() method
> > - Add support for draining the DMA with an extra buffer, to get rid of
> > stale data in the pipeline on stream stop (or when frames start
> > getting dropped due to load)
> > - Queue all available buffers to DMAEngine in the callback, also use a
> > separate "submitted" queue to track all buffers submitted to DMA
> > - Use video_device_pipeline_start() instead of media_pipeline_start()
> > - Drop support for VB_READ
> > - Print issues in link validation as DEBUG instead of ERROR
> > - s/async_subdev/async_connection
> >
> > MAINTAINERS | 7 +
> > drivers/media/platform/ti/Kconfig | 12 +
> > drivers/media/platform/ti/Makefile | 1 +
> > drivers/media/platform/ti/j721e-csi2rx/Makefile | 2 +
> > .../media/platform/ti/j721e-csi2rx/j721e-csi2rx.c | 1127 ++++++++++++++++++++
> > 5 files changed, 1149 insertions(+)
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index d7b867c57920..1c2d75c30ce7 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -21445,6 +21445,13 @@ F: Documentation/devicetree/bindings/media/i2c/ti,ds90*
> > F: drivers/media/i2c/ds90*
> > F: include/media/i2c/ds90*
> > +TI J721E CSI2RX DRIVER
> > +M: Jai Luthra <j-luthra at ti.com>
> > +L: linux-media at vger.kernel.org
> > +S: Maintained
> > +F: Documentation/devicetree/bindings/media/ti,j721e-csi2rx.yaml
> > +F: drivers/media/platform/ti/j721e-csi2rx/
> > +
> > TI KEYSTONE MULTICORE NAVIGATOR DRIVERS
> > M: Nishanth Menon <nm at ti.com>
> > M: Santosh Shilimkar <ssantosh at kernel.org>
> > diff --git a/drivers/media/platform/ti/Kconfig b/drivers/media/platform/ti/Kconfig
> > index e1ab56c3be1f..42c908f6e1ae 100644
> > --- a/drivers/media/platform/ti/Kconfig
> > +++ b/drivers/media/platform/ti/Kconfig
> > @@ -63,6 +63,18 @@ config VIDEO_TI_VPE_DEBUG
> > help
> > Enable debug messages on VPE driver.
> > +config VIDEO_TI_J721E_CSI2RX
> > + tristate "TI J721E CSI2RX wrapper layer driver"
> > + depends on VIDEO_DEV && VIDEO_V4L2_SUBDEV_API
> > + depends on MEDIA_SUPPORT && MEDIA_CONTROLLER
> > + depends on PHY_CADENCE_DPHY_RX && VIDEO_CADENCE_CSI2RX
> > + depends on ARCH_K3 || COMPILE_TEST
> > + select VIDEOBUF2_DMA_CONTIG
> > + select V4L2_FWNODE
> > + help
> > + Support for TI CSI2RX wrapper layer. This just enables the wrapper driver.
> > + The Cadence CSI2RX bridge driver needs to be enabled separately.
> > +
> > source "drivers/media/platform/ti/am437x/Kconfig"
> > source "drivers/media/platform/ti/davinci/Kconfig"
> > source "drivers/media/platform/ti/omap/Kconfig"
> > diff --git a/drivers/media/platform/ti/Makefile b/drivers/media/platform/ti/Makefile
> > index 98c5fe5c40d6..8a2f74c9380e 100644
> > --- a/drivers/media/platform/ti/Makefile
> > +++ b/drivers/media/platform/ti/Makefile
> > @@ -3,5 +3,6 @@ obj-y += am437x/
> > obj-y += cal/
> > obj-y += vpe/
> > obj-y += davinci/
> > +obj-y += j721e-csi2rx/
> > obj-y += omap/
> > obj-y += omap3isp/
> > diff --git a/drivers/media/platform/ti/j721e-csi2rx/Makefile b/drivers/media/platform/ti/j721e-csi2rx/Makefile
> > new file mode 100644
> > index 000000000000..377afc1d6280
> > --- /dev/null
> > +++ b/drivers/media/platform/ti/j721e-csi2rx/Makefile
> > @@ -0,0 +1,2 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +obj-$(CONFIG_VIDEO_TI_J721E_CSI2RX) += j721e-csi2rx.o
> > diff --git a/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c b/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c
> > new file mode 100644
> > index 000000000000..29f1879cfc25
> > --- /dev/null
> > +++ b/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c
> > @@ -0,0 +1,1127 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * TI CSI2RX Shim Wrapper Driver
> > + *
> > + * Copyright (C) 2021 Texas Instruments Incorporated - https://www.ti.com/
>
> You can update the year above.
>
Will do.
> > + * Author: Pratyush Yadav <p.yadav at ti.com>
> > + */
> > +
> > +#include <linux/bitfield.h>
> > +#include <linux/dmaengine.h>
> > +#include <linux/module.h>
> > +#include <linux/of_platform.h>
> > +#include <linux/platform_device.h>
> > +
> > +#include <media/mipi-csi2.h>
> > +#include <media/v4l2-device.h>
> > +#include <media/v4l2-ioctl.h>
> > +#include <media/v4l2-mc.h>
> > +#include <media/videobuf2-dma-contig.h>
> > +
> > +#define TI_CSI2RX_MODULE_NAME "j721e-csi2rx"
> > +
> > +#define SHIM_CNTL 0x10
> > +#define SHIM_CNTL_PIX_RST BIT(0)
> > +
> > +#define SHIM_DMACNTX 0x20
> > +#define SHIM_DMACNTX_EN BIT(31)
> > +#define SHIM_DMACNTX_YUV422 GENMASK(27, 26)
> > +#define SHIM_DMACNTX_SIZE GENMASK(21, 20)
> > +#define SHIM_DMACNTX_FMT GENMASK(5, 0)
> > +#define SHIM_DMACNTX_UYVY 0
> > +#define SHIM_DMACNTX_VYUY 1
> > +#define SHIM_DMACNTX_YUYV 2
> > +#define SHIM_DMACNTX_YVYU 3
> > +#define SHIM_DMACNTX_SIZE_8 0
> > +#define SHIM_DMACNTX_SIZE_16 1
> > +#define SHIM_DMACNTX_SIZE_32 2
> > +
> > +#define SHIM_PSI_CFG0 0x24
> > +#define SHIM_PSI_CFG0_SRC_TAG GENMASK(15, 0)
> > +#define SHIM_PSI_CFG0_DST_TAG GENMASK(31, 16)
> > +
> > +#define PSIL_WORD_SIZE_BYTES 16
> > +/*
> > + * There are no hard limits on the width or height. The DMA engine can handle
> > + * all sizes. The max width and height are arbitrary numbers for this driver.
> > + * Use 16K * 16K as the arbitrary limit. It is large enough that it is unlikely
> > + * the limit will be hit in practice.
> > + */
> > +#define MAX_WIDTH_BYTES SZ_16K
> > +#define MAX_HEIGHT_LINES SZ_16K
> > +
> > +#define DRAIN_TIMEOUT_MS 50
> > +
> > +struct ti_csi2rx_fmt {
> > + u32 fourcc; /* Four character code. */
> > + u32 code; /* Mbus code. */
> > + u32 csi_dt; /* CSI Data type. */
> > + u8 bpp; /* Bits per pixel. */
> > + u8 size; /* Data size shift when unpacking. */
> > +};
> > +
> > +struct ti_csi2rx_buffer {
> > + /* Common v4l2 buffer. Must be first. */
> > + struct vb2_v4l2_buffer vb;
> > + struct list_head list;
> > + struct ti_csi2rx_dev *csi;
> > +};
> > +
> > +enum ti_csi2rx_dma_state {
> > + TI_CSI2RX_DMA_STOPPED, /* Streaming not started yet. */
> > + TI_CSI2RX_DMA_IDLE, /* Streaming but no pending DMA operation. */
> > + TI_CSI2RX_DMA_ACTIVE, /* Streaming and pending DMA operation. */
> > +};
> > +
> > +struct ti_csi2rx_dma {
> > + /* Protects all fields in this struct. */
> > + spinlock_t lock;
> > + struct dma_chan *chan;
> > + /* Buffers queued to the driver, waiting to be processed by DMA. */
> > + struct list_head queue;
> > + enum ti_csi2rx_dma_state state;
> > + /*
> > + * Queue of buffers submitted to DMA engine.
> > + */
> > + struct list_head submitted;
> > +};
> > +
> > +struct ti_csi2rx_dev {
> > + struct device *dev;
> > + void __iomem *shim;
> > + struct v4l2_device v4l2_dev;
> > + struct video_device vdev;
> > + struct media_device mdev;
> > + struct media_pipeline pipe;
> > + struct media_pad pad;
> > + struct v4l2_async_notifier notifier;
> > + struct v4l2_subdev *subdev;
>
> I think "source_subdev" is a better name, to make it clear it's not
> referring to a subdev owned by this driver.
>
Good catch, for multi-stream support we did end up renaming this to
"source" as this driver gets a subdev of its own. Will update the name
here itself in next revision.
> > + struct vb2_queue vidq;
> > + struct mutex mutex; /* To serialize ioctls. */
> > + struct v4l2_format v_fmt;
> > + struct ti_csi2rx_dma dma;
> > + u32 sequence;
> > +};
> > +
> > +static const struct ti_csi2rx_fmt formats[] = {
> > + {
> > + .fourcc = V4L2_PIX_FMT_YUYV,
> > + .code = MEDIA_BUS_FMT_YUYV8_1X16,
> > + .csi_dt = MIPI_CSI2_DT_YUV422_8B,
> > + .bpp = 16,
> > + .size = SHIM_DMACNTX_SIZE_8,
> > + }, {
> > + .fourcc = V4L2_PIX_FMT_UYVY,
> > + .code = MEDIA_BUS_FMT_UYVY8_1X16,
> > + .csi_dt = MIPI_CSI2_DT_YUV422_8B,
> > + .bpp = 16,
> > + .size = SHIM_DMACNTX_SIZE_8,
> > + }, {
> > + .fourcc = V4L2_PIX_FMT_YVYU,
> > + .code = MEDIA_BUS_FMT_YVYU8_1X16,
> > + .csi_dt = MIPI_CSI2_DT_YUV422_8B,
> > + .bpp = 16,
> > + .size = SHIM_DMACNTX_SIZE_8,
> > + }, {
> > + .fourcc = V4L2_PIX_FMT_VYUY,
> > + .code = MEDIA_BUS_FMT_VYUY8_1X16,
> > + .csi_dt = MIPI_CSI2_DT_YUV422_8B,
> > + .bpp = 16,
> > + .size = SHIM_DMACNTX_SIZE_8,
> > + }, {
> > + .fourcc = V4L2_PIX_FMT_SBGGR8,
> > + .code = MEDIA_BUS_FMT_SBGGR8_1X8,
> > + .csi_dt = MIPI_CSI2_DT_RAW8,
> > + .bpp = 8,
> > + .size = SHIM_DMACNTX_SIZE_8,
> > + }, {
> > + .fourcc = V4L2_PIX_FMT_SGBRG8,
> > + .code = MEDIA_BUS_FMT_SGBRG8_1X8,
> > + .csi_dt = MIPI_CSI2_DT_RAW8,
> > + .bpp = 8,
> > + .size = SHIM_DMACNTX_SIZE_8,
> > + }, {
> > + .fourcc = V4L2_PIX_FMT_SGRBG8,
> > + .code = MEDIA_BUS_FMT_SGRBG8_1X8,
> > + .csi_dt = MIPI_CSI2_DT_RAW8,
> > + .bpp = 8,
> > + .size = SHIM_DMACNTX_SIZE_8,
> > + }, {
> > + .fourcc = V4L2_PIX_FMT_SRGGB8,
> > + .code = MEDIA_BUS_FMT_SRGGB8_1X8,
> > + .csi_dt = MIPI_CSI2_DT_RAW8,
> > + .bpp = 8,
> > + .size = SHIM_DMACNTX_SIZE_8,
> > + }, {
> > + .fourcc = V4L2_PIX_FMT_SBGGR10,
> > + .code = MEDIA_BUS_FMT_SBGGR10_1X10,
> > + .csi_dt = MIPI_CSI2_DT_RAW10,
> > + .bpp = 16,
> > + .size = SHIM_DMACNTX_SIZE_16,
> > + }, {
> > + .fourcc = V4L2_PIX_FMT_SGBRG10,
> > + .code = MEDIA_BUS_FMT_SGBRG10_1X10,
> > + .csi_dt = MIPI_CSI2_DT_RAW10,
> > + .bpp = 16,
> > + .size = SHIM_DMACNTX_SIZE_16,
> > + }, {
> > + .fourcc = V4L2_PIX_FMT_SGRBG10,
> > + .code = MEDIA_BUS_FMT_SGRBG10_1X10,
> > + .csi_dt = MIPI_CSI2_DT_RAW10,
> > + .bpp = 16,
> > + .size = SHIM_DMACNTX_SIZE_16,
> > + }, {
> > + .fourcc = V4L2_PIX_FMT_SRGGB10,
> > + .code = MEDIA_BUS_FMT_SRGGB10_1X10,
> > + .csi_dt = MIPI_CSI2_DT_RAW10,
> > + .bpp = 16,
> > + .size = SHIM_DMACNTX_SIZE_16,
> > + },
> > +
> > + /* More formats can be supported but they are not listed for now. */
> > +};
> > +
> > +static const unsigned int num_formats = ARRAY_SIZE(formats);
> > +
> > +/* Forward declaration needed by ti_csi2rx_dma_callback. */
> > +static int ti_csi2rx_start_dma(struct ti_csi2rx_dev *csi,
> > + struct ti_csi2rx_buffer *buf);
> > +
> > +static const struct ti_csi2rx_fmt *find_format_by_pix(u32 pixelformat)
> > +{
> > + unsigned int i;
> > +
> > + for (i = 0; i < num_formats; i++) {
> > + if (formats[i].fourcc == pixelformat)
> > + return &formats[i];
> > + }
> > +
> > + return NULL;
> > +}
> > +
> > +static const struct ti_csi2rx_fmt *find_format_by_code(u32 code)
> > +{
> > + unsigned int i;
> > +
> > + for (i = 0; i < num_formats; i++) {
> > + if (formats[i].code == code)
> > + return &formats[i];
> > + }
> > +
> > + return NULL;
> > +}
> > +
> > +static void ti_csi2rx_fill_fmt(const struct ti_csi2rx_fmt *csi_fmt,
> > + struct v4l2_format *v4l2_fmt)
> > +{
> > + struct v4l2_pix_format *pix = &v4l2_fmt->fmt.pix;
> > + unsigned int pixels_in_word;
> > + u8 bpp = csi_fmt->bpp;
> > + u32 bpl;
> > +
> > + pixels_in_word = PSIL_WORD_SIZE_BYTES * 8 / bpp;
> > +
> > + pix->width = clamp_t(unsigned int, pix->width,
> > + pixels_in_word,
> > + MAX_WIDTH_BYTES * 8 / bpp);
> > + pix->width = rounddown(pix->width, pixels_in_word);
> > +
> > + pix->height = clamp_t(unsigned int, pix->height, 1, MAX_HEIGHT_LINES);
> > +
> > + v4l2_fmt->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> > + pix->pixelformat = csi_fmt->fourcc;
> > + pix->colorspace = V4L2_COLORSPACE_SRGB;
> > + pix->sizeimage = pix->height * pix->width * (bpp / 8);
> > +
> > + bpl = (pix->width * ALIGN(bpp, 8)) >> 3;
>
> You do "/ 8" and "* 8" elsewhere in the function, so I think it makes sense
> to "/ 8" here too, instead of ">> 3".
Will fix.
>
> Is this correct? Why is aligned bpp used here, but when calculating
> sizeimage, bpp is not aligned?
Hmm I agree this whole function is quite confusing, It should either be
ALIGN(bpp, 8) everywhere or we can just remove that given the hardware
is unwrapping currently supported formats to multiples of 8 bits (even
RAW10/RAW12) and the bpp in the table above matches that.
>
> > + pix->bytesperline = ALIGN(bpl, 16);
>
> Why align to 16?
This might be redundant given we are rounding down the width to make
sure it's a multiple of PSIL_WORD_SIZE_BYTES.
>
> Shouldn't sizeimage usually be bytesperline * height?
>
> You could add a few comments here to clarify all the aligns, roundings and
> clampings.
Will do.
>
> > +}
> > +
> > +static int ti_csi2rx_querycap(struct file *file, void *priv,
> > + struct v4l2_capability *cap)
> > +{
> > + strscpy(cap->driver, TI_CSI2RX_MODULE_NAME, sizeof(cap->driver));
> > + strscpy(cap->card, TI_CSI2RX_MODULE_NAME, sizeof(cap->card));
> > +
> > + return 0;
> > +}
> > +
> > +static int ti_csi2rx_enum_fmt_vid_cap(struct file *file, void *priv,
> > + struct v4l2_fmtdesc *f)
> > +{
> > + const struct ti_csi2rx_fmt *fmt = NULL;
> > +
> > + if (f->mbus_code) {
> > + if (f->index > 0)
> > + return -EINVAL;
>
> This fails to enumerate the formats if mbus_code is set, doesn't it?
>
Sakari is correct, this is required according to the spec for devices
that set the V4L2_CAP_IO_MC capability. Caught this while enabling
libcamera simple pipeline:)
> > +
> > + fmt = find_format_by_code(f->mbus_code);
> > + } else {
> > + if (f->index >= num_formats)
> > + return -EINVAL;
> > +
> > + fmt = &formats[f->index];
> > + }
> > +
> > + if (!fmt)
> > + return -EINVAL;
> > +
> > + f->pixelformat = fmt->fourcc;
> > + memset(f->reserved, 0, sizeof(f->reserved));
> > + f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> > +
> > + return 0;
> > +}
> > +
> > +static int ti_csi2rx_g_fmt_vid_cap(struct file *file, void *prov,
> > + struct v4l2_format *f)
> > +{
> > + struct ti_csi2rx_dev *csi = video_drvdata(file);
> > +
> > + *f = csi->v_fmt;
> > +
> > + return 0;
> > +}
> > +
> > +static int ti_csi2rx_try_fmt_vid_cap(struct file *file, void *priv,
> > + struct v4l2_format *f)
> > +{
> > + const struct ti_csi2rx_fmt *fmt;
> > +
> > + /*
> > + * Default to the first format if the requested pixel format code isn't
> > + * supported.
> > + */
> > + fmt = find_format_by_pix(f->fmt.pix.pixelformat);
> > + if (!fmt)
> > + fmt = &formats[0];
> > +
> > + if (f->fmt.pix.field == V4L2_FIELD_ANY)
> > + f->fmt.pix.field = V4L2_FIELD_NONE;
> > +
> > + if (f->fmt.pix.field != V4L2_FIELD_NONE)
> > + /* Interlaced formats are not supported. */
> > + f->fmt.pix.field = V4L2_FIELD_NONE;
>
> Can't you just always set the field to V4L2_FIELD_NONE?
>
Will fix.
> > + ti_csi2rx_fill_fmt(fmt, f);
> > +
> > + return 0;
> > +}
> > +
> > +static int ti_csi2rx_s_fmt_vid_cap(struct file *file, void *priv,
> > + struct v4l2_format *f)
> > +{
> > + struct ti_csi2rx_dev *csi = video_drvdata(file);
> > + struct vb2_queue *q = &csi->vidq;
> > + int ret;
> > +
> > + if (vb2_is_busy(q))
> > + return -EBUSY;
> > +
> > + ret = ti_csi2rx_try_fmt_vid_cap(file, priv, f);
> > + if (ret < 0)
> > + return ret;
> > +
> > + csi->v_fmt = *f;
> > +
> > + return 0;
> > +}
> > +
> > +static int ti_csi2rx_enum_framesizes(struct file *file, void *fh,
> > + struct v4l2_frmsizeenum *fsize)
> > +{
> > + const struct ti_csi2rx_fmt *fmt;
> > + unsigned int pixels_in_word;
> > + u8 bpp;
> > +
> > + fmt = find_format_by_pix(fsize->pixel_format);
> > + if (!fmt || fsize->index != 0)
> > + return -EINVAL;
> > +
> > + bpp = ALIGN(fmt->bpp, 8);
> > +
> > + /*
> > + * Number of pixels in one PSI-L word. The transfer happens in multiples
> > + * of PSI-L word sizes.
> > + */
> > + pixels_in_word = PSIL_WORD_SIZE_BYTES * 8 / bpp;
> > +
> > + fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
> > + fsize->stepwise.min_width = pixels_in_word;
> > + fsize->stepwise.max_width = rounddown(MAX_WIDTH_BYTES * 8 / bpp,
> > + pixels_in_word);
> > + fsize->stepwise.step_width = pixels_in_word;
> > + fsize->stepwise.min_height = 1;
> > + fsize->stepwise.max_height = MAX_HEIGHT_LINES;
> > + fsize->stepwise.step_height = 1;
> > +
> > + return 0;
> > +}
> > +
> > +static const struct v4l2_ioctl_ops csi_ioctl_ops = {
> > + .vidioc_querycap = ti_csi2rx_querycap,
> > + .vidioc_enum_fmt_vid_cap = ti_csi2rx_enum_fmt_vid_cap,
> > + .vidioc_try_fmt_vid_cap = ti_csi2rx_try_fmt_vid_cap,
> > + .vidioc_g_fmt_vid_cap = ti_csi2rx_g_fmt_vid_cap,
> > + .vidioc_s_fmt_vid_cap = ti_csi2rx_s_fmt_vid_cap,
> > + .vidioc_enum_framesizes = ti_csi2rx_enum_framesizes,
> > + .vidioc_reqbufs = vb2_ioctl_reqbufs,
> > + .vidioc_create_bufs = vb2_ioctl_create_bufs,
> > + .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
> > + .vidioc_querybuf = vb2_ioctl_querybuf,
> > + .vidioc_qbuf = vb2_ioctl_qbuf,
> > + .vidioc_dqbuf = vb2_ioctl_dqbuf,
> > + .vidioc_expbuf = vb2_ioctl_expbuf,
> > + .vidioc_streamon = vb2_ioctl_streamon,
> > + .vidioc_streamoff = vb2_ioctl_streamoff,
> > +};
> > +
> > +static const struct v4l2_file_operations csi_fops = {
> > + .owner = THIS_MODULE,
> > + .open = v4l2_fh_open,
> > + .release = vb2_fop_release,
> > + .read = vb2_fop_read,
> > + .poll = vb2_fop_poll,
> > + .unlocked_ioctl = video_ioctl2,
> > + .mmap = vb2_fop_mmap,
> > +};
> > +
> > +static int csi_async_notifier_bound(struct v4l2_async_notifier *notifier,
> > + struct v4l2_subdev *subdev,
> > + struct v4l2_async_connection *asc)
> > +{
> > + struct ti_csi2rx_dev *csi = dev_get_drvdata(notifier->v4l2_dev->dev);
> > +
> > + csi->subdev = subdev;
> > +
> > + return 0;
> > +}
> > +
> > +static int csi_async_notifier_complete(struct v4l2_async_notifier *notifier)
> > +{
> > + struct ti_csi2rx_dev *csi = dev_get_drvdata(notifier->v4l2_dev->dev);
> > + struct video_device *vdev = &csi->vdev;
> > + int ret;
> > +
> > + ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
> > + if (ret)
> > + return ret;
> > +
> > + ret = v4l2_create_fwnode_links_to_pad(csi->subdev, &csi->pad,
> > + MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
> > +
> > + if (ret) {
> > + video_unregister_device(vdev);
> > + return ret;
> > + }
> > +
> > + return v4l2_device_register_subdev_nodes(&csi->v4l2_dev);
> > +}
> > +
> > +static const struct v4l2_async_notifier_operations csi_async_notifier_ops = {
> > + .bound = csi_async_notifier_bound,
> > + .complete = csi_async_notifier_complete,
> > +};
> > +
> > +static int ti_csi2rx_init_subdev(struct ti_csi2rx_dev *csi)
>
> This is misnamed. ti_csi2rx_async_notifier_register()?
>
Will fix.
> > +{
> > + struct fwnode_handle *fwnode;
> > + struct v4l2_async_connection *asc;
> > + struct device_node *node;
> > + int ret;
> > +
> > + node = of_get_child_by_name(csi->dev->of_node, "csi-bridge");
> > + if (!node)
> > + return -EINVAL;
> > +
> > + fwnode = of_fwnode_handle(node);
> > + if (!fwnode) {
> > + of_node_put(node);
> > + return -EINVAL;
> > + }
> > +
> > + v4l2_async_nf_init(&csi->notifier, &csi->v4l2_dev);
> > + csi->notifier.ops = &csi_async_notifier_ops;
> > +
> > + asc = v4l2_async_nf_add_fwnode(&csi->notifier, fwnode,
> > + struct v4l2_async_connection);
> > + of_node_put(node);
> > + if (IS_ERR(asc)) {
> > + v4l2_async_nf_cleanup(&csi->notifier);
> > + return PTR_ERR(asc);
> > + }
> > +
> > + ret = v4l2_async_nf_register(&csi->notifier);
> > + if (ret) {
> > + v4l2_async_nf_cleanup(&csi->notifier);
> > + return ret;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static void ti_csi2rx_setup_shim(struct ti_csi2rx_dev *csi)
> > +{
> > + const struct ti_csi2rx_fmt *fmt;
> > + unsigned int reg;
> > +
> > + fmt = find_format_by_pix(csi->v_fmt.fmt.pix.pixelformat);
> > + if (!fmt) {
> > + dev_err(csi->dev, "Unknown format\n");
> > + return;
> > + }
>
> The error print here is rather vague, and as there's no error code returned,
> the caller doesn't handle the error.
>
Will fix.
> > +
> > + /* De-assert the pixel interface reset. */
> > + reg = SHIM_CNTL_PIX_RST;
> > + writel(reg, csi->shim + SHIM_CNTL);
> > +
> > + reg = SHIM_DMACNTX_EN;
> > + reg |= FIELD_PREP(SHIM_DMACNTX_FMT, fmt->csi_dt);
> > +
> > + /*
> > + * Using the values from the documentation gives incorrect ordering for
> > + * the luma and chroma components. In practice, the "reverse" format
> > + * gives the correct image. So for example, if the image is in UYVY, the
> > + * reverse would be YVYU.
> > + */
> > + switch (fmt->fourcc) {
> > + case V4L2_PIX_FMT_UYVY:
> > + reg |= FIELD_PREP(SHIM_DMACNTX_YUV422,
> > + SHIM_DMACNTX_YVYU);
> > + break;
> > + case V4L2_PIX_FMT_VYUY:
> > + reg |= FIELD_PREP(SHIM_DMACNTX_YUV422,
> > + SHIM_DMACNTX_YUYV);
> > + break;
> > + case V4L2_PIX_FMT_YUYV:
> > + reg |= FIELD_PREP(SHIM_DMACNTX_YUV422,
> > + SHIM_DMACNTX_VYUY);
> > + break;
> > + case V4L2_PIX_FMT_YVYU:
> > + reg |= FIELD_PREP(SHIM_DMACNTX_YUV422,
> > + SHIM_DMACNTX_UYVY);
> > + break;
> > + default:
> > + /* Ignore if not YUV 4:2:2 */
> > + break;
> > + }
> > +
> > + reg |= FIELD_PREP(SHIM_DMACNTX_SIZE, fmt->size);
> > +
> > + writel(reg, csi->shim + SHIM_DMACNTX);
> > +
> > + reg = FIELD_PREP(SHIM_PSI_CFG0_SRC_TAG, 0) |
> > + FIELD_PREP(SHIM_PSI_CFG0_DST_TAG, 0);
> > + writel(reg, csi->shim + SHIM_PSI_CFG0);
> > +}
> > +
> > +static void ti_csi2rx_drain_callback(void *param)
> > +{
> > + struct completion *drain_complete = param;
> > +
> > + complete(drain_complete);
> > +}
> > +
> > +static int ti_csi2rx_drain_dma(struct ti_csi2rx_dev *csi)
> > +{
>
> I think it would be good to explain in a comment somewhere what why this dma
> draining is needed and how it works.
>
Makes sense, will do.
> > + struct dma_async_tx_descriptor *desc;
> > + struct device *dev = csi->dma.chan->device->dev;
> > + struct completion drain_complete;
> > + void *buf;
> > + size_t len = csi->v_fmt.fmt.pix.sizeimage;
> > + dma_addr_t addr;
> > + dma_cookie_t cookie;
> > + int ret;
> > +
> > + init_completion(&drain_complete);
> > +
> > + buf = dma_alloc_coherent(dev, len, &addr, GFP_KERNEL | GFP_ATOMIC);
> > + if (!buf)
> > + return -ENOMEM;
>
> If I understand right, this is called when the streaming is stopped, but
> could also be called on frame drops? You're allocating a DMA buffer for a
> full frame. Large runtime DMA buffer allocations are a bit scary. What
> happens if it fails?
>
> Is it possible to preallocate, or use smaller buffers (perhaps with multiple
> dma operations) to do the flush?
>
> The dma doesn't support writing to a constant address, does it (in which
> case a very small buffer would suffice)?
Hmm you're absolutely right. Will have to experiment if doing multiple
dma ops on a small buffer would be feasible for multi-camera/stream
scenarios. But at the minimum will switch to allocating the drain buffer
only one time in the next revision.
>
> Tomi
>
--
Thanks,
Jai
GPG Fingerprint: 4DE0 D818 E5D5 75E8 D45A AFC5 43DE 91F9 249A 7145
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: not available
URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20230803/705c2dcf/attachment-0001.sig>
More information about the linux-arm-kernel
mailing list