diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/staging/media/imx/imx-media-csi.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/staging/media/imx/imx-media-csi.c')
-rw-r--r-- | drivers/staging/media/imx/imx-media-csi.c | 2089 |
1 files changed, 2089 insertions, 0 deletions
diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c new file mode 100644 index 000000000..b2b1f4dd4 --- /dev/null +++ b/drivers/staging/media/imx/imx-media-csi.c @@ -0,0 +1,2089 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * V4L2 Capture CSI Subdev for Freescale i.MX5/6 SOC + * + * Copyright (c) 2014-2017 Mentor Graphics Inc. + * Copyright (C) 2017 Pengutronix, Philipp Zabel <kernel@pengutronix.de> + */ +#include <linux/delay.h> +#include <linux/gcd.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/of_graph.h> +#include <linux/pinctrl/consumer.h> +#include <linux/platform_device.h> +#include <media/v4l2-ctrls.h> +#include <media/v4l2-device.h> +#include <media/v4l2-event.h> +#include <media/v4l2-fwnode.h> +#include <media/v4l2-mc.h> +#include <media/v4l2-subdev.h> +#include <media/videobuf2-dma-contig.h> +#include <video/imx-ipu-v3.h> +#include <media/imx.h> +#include "imx-media.h" + +/* + * Min/Max supported width and heights. + * + * We allow planar output, so we have to align width by 16 pixels + * to meet IDMAC alignment requirements. + * + * TODO: move this into pad format negotiation, if capture device + * has not requested planar formats, we should allow 8 pixel + * alignment. + */ +#define MIN_W 32 +#define MIN_H 32 +#define MAX_W 4096 +#define MAX_H 4096 +#define W_ALIGN 1 /* multiple of 2 pixels */ +#define H_ALIGN 1 /* multiple of 2 lines */ +#define S_ALIGN 1 /* multiple of 2 */ + +/* + * struct csi_skip_desc - CSI frame skipping descriptor + * @keep - number of frames kept per max_ratio frames + * @max_ratio - width of skip_smfc, written to MAX_RATIO bitfield + * @skip_smfc - skip pattern written to the SKIP_SMFC bitfield + */ +struct csi_skip_desc { + u8 keep; + u8 max_ratio; + u8 skip_smfc; +}; + +struct csi_priv { + struct device *dev; + struct ipu_soc *ipu; + struct v4l2_subdev sd; + struct media_pad pad[CSI_NUM_PADS]; + struct v4l2_async_notifier notifier; + + /* the video device at IDMAC output pad */ + struct imx_media_video_dev *vdev; + struct imx_media_fim *fim; + int csi_id; + int smfc_id; + + /* lock to protect all members below */ + struct mutex lock; + + int active_output_pad; + + struct ipuv3_channel *idmac_ch; + struct ipu_smfc *smfc; + struct ipu_csi *csi; + + struct v4l2_mbus_framefmt format_mbus[CSI_NUM_PADS]; + const struct imx_media_pixfmt *cc[CSI_NUM_PADS]; + struct v4l2_fract frame_interval[CSI_NUM_PADS]; + struct v4l2_rect crop; + struct v4l2_rect compose; + const struct csi_skip_desc *skip; + + /* active vb2 buffers to send to video dev sink */ + struct imx_media_buffer *active_vb2_buf[2]; + struct imx_media_dma_buf underrun_buf; + + int ipu_buf_num; /* ipu double buffer index: 0-1 */ + + /* the sink for the captured frames */ + struct media_entity *sink; + enum ipu_csi_dest dest; + /* the source subdev */ + struct v4l2_subdev *src_sd; + + /* the mipi virtual channel number at link validate */ + int vc_num; + + /* the upstream endpoint CSI is receiving from */ + struct v4l2_fwnode_endpoint upstream_ep; + + spinlock_t irqlock; /* protect eof_irq handler */ + struct timer_list eof_timeout_timer; + int eof_irq; + int nfb4eof_irq; + + struct v4l2_ctrl_handler ctrl_hdlr; + + int stream_count; /* streaming counter */ + u32 frame_sequence; /* frame sequence counter */ + bool last_eof; /* waiting for last EOF at stream off */ + bool nfb4eof; /* NFB4EOF encountered during streaming */ + bool interweave_swap; /* swap top/bottom lines when interweaving */ + struct completion last_eof_comp; +}; + +static inline struct csi_priv *sd_to_dev(struct v4l2_subdev *sdev) +{ + return container_of(sdev, struct csi_priv, sd); +} + +static inline struct csi_priv *notifier_to_dev(struct v4l2_async_notifier *n) +{ + return container_of(n, struct csi_priv, notifier); +} + +static inline bool is_parallel_bus(struct v4l2_fwnode_endpoint *ep) +{ + return ep->bus_type != V4L2_MBUS_CSI2_DPHY; +} + +static inline bool is_parallel_16bit_bus(struct v4l2_fwnode_endpoint *ep) +{ + return is_parallel_bus(ep) && ep->bus.parallel.bus_width >= 16; +} + +/* + * Check for conditions that require the IPU to handle the + * data internally as generic data, aka passthrough mode: + * - raw bayer media bus formats, or + * - BT.656 and BT.1120 (8/10-bit YUV422) data can always be processed + * on-the-fly + * - the CSI is receiving from a 16-bit parallel bus, or + * - the CSI is receiving from an 8-bit parallel bus and the incoming + * media bus format is other than UYVY8_2X8/YUYV8_2X8. + */ +static inline bool requires_passthrough(struct v4l2_fwnode_endpoint *ep, + struct v4l2_mbus_framefmt *infmt, + const struct imx_media_pixfmt *incc) +{ + if (ep->bus_type == V4L2_MBUS_BT656) // including BT.1120 + return false; + + return incc->bayer || is_parallel_16bit_bus(ep) || + (is_parallel_bus(ep) && + infmt->code != MEDIA_BUS_FMT_UYVY8_2X8 && + infmt->code != MEDIA_BUS_FMT_YUYV8_2X8); +} + +/* + * Parses the fwnode endpoint from the source pad of the entity + * connected to this CSI. This will either be the entity directly + * upstream from the CSI-2 receiver, directly upstream from the + * video mux, or directly upstream from the CSI itself. The endpoint + * is needed to determine the bus type and bus config coming into + * the CSI. + */ +static int csi_get_upstream_endpoint(struct csi_priv *priv, + struct v4l2_fwnode_endpoint *ep) +{ + struct fwnode_handle *endpoint; + struct v4l2_subdev *sd; + struct media_pad *pad; + + if (!IS_ENABLED(CONFIG_OF)) + return -ENXIO; + + if (!priv->src_sd) + return -EPIPE; + + sd = priv->src_sd; + + switch (sd->grp_id) { + case IMX_MEDIA_GRP_ID_CSI_MUX: + /* + * CSI is connected directly to CSI mux, skip up to + * CSI-2 receiver if it is in the path, otherwise stay + * with the CSI mux. + */ + sd = imx_media_pipeline_subdev(&sd->entity, + IMX_MEDIA_GRP_ID_CSI2, + true); + if (IS_ERR(sd)) + sd = priv->src_sd; + break; + case IMX_MEDIA_GRP_ID_CSI2: + break; + default: + /* + * the source is neither the CSI mux nor the CSI-2 receiver, + * get the source pad directly upstream from CSI itself. + */ + sd = &priv->sd; + break; + } + + /* get source pad of entity directly upstream from sd */ + pad = imx_media_pipeline_pad(&sd->entity, 0, 0, true); + if (!pad) + return -ENODEV; + + endpoint = imx_media_get_pad_fwnode(pad); + if (IS_ERR(endpoint)) + return PTR_ERR(endpoint); + + v4l2_fwnode_endpoint_parse(endpoint, ep); + + fwnode_handle_put(endpoint); + + return 0; +} + +static void csi_idmac_put_ipu_resources(struct csi_priv *priv) +{ + if (priv->idmac_ch) + ipu_idmac_put(priv->idmac_ch); + priv->idmac_ch = NULL; + + if (priv->smfc) + ipu_smfc_put(priv->smfc); + priv->smfc = NULL; +} + +static int csi_idmac_get_ipu_resources(struct csi_priv *priv) +{ + int ch_num, ret; + struct ipu_smfc *smfc; + struct ipuv3_channel *idmac_ch; + + ch_num = IPUV3_CHANNEL_CSI0 + priv->smfc_id; + + smfc = ipu_smfc_get(priv->ipu, ch_num); + if (IS_ERR(smfc)) { + v4l2_err(&priv->sd, "failed to get SMFC\n"); + ret = PTR_ERR(smfc); + goto out; + } + priv->smfc = smfc; + + idmac_ch = ipu_idmac_get(priv->ipu, ch_num); + if (IS_ERR(idmac_ch)) { + v4l2_err(&priv->sd, "could not get IDMAC channel %u\n", + ch_num); + ret = PTR_ERR(idmac_ch); + goto out; + } + priv->idmac_ch = idmac_ch; + + return 0; +out: + csi_idmac_put_ipu_resources(priv); + return ret; +} + +static void csi_vb2_buf_done(struct csi_priv *priv) +{ + struct imx_media_video_dev *vdev = priv->vdev; + struct imx_media_buffer *done, *next; + struct vb2_buffer *vb; + dma_addr_t phys; + + done = priv->active_vb2_buf[priv->ipu_buf_num]; + if (done) { + done->vbuf.field = vdev->fmt.field; + done->vbuf.sequence = priv->frame_sequence; + vb = &done->vbuf.vb2_buf; + vb->timestamp = ktime_get_ns(); + vb2_buffer_done(vb, priv->nfb4eof ? + VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE); + } + + priv->frame_sequence++; + priv->nfb4eof = false; + + /* get next queued buffer */ + next = imx_media_capture_device_next_buf(vdev); + if (next) { + phys = vb2_dma_contig_plane_dma_addr(&next->vbuf.vb2_buf, 0); + priv->active_vb2_buf[priv->ipu_buf_num] = next; + } else { + phys = priv->underrun_buf.phys; + priv->active_vb2_buf[priv->ipu_buf_num] = NULL; + } + + if (ipu_idmac_buffer_is_ready(priv->idmac_ch, priv->ipu_buf_num)) + ipu_idmac_clear_buffer(priv->idmac_ch, priv->ipu_buf_num); + + if (priv->interweave_swap) + phys += vdev->fmt.bytesperline; + + ipu_cpmem_set_buffer(priv->idmac_ch, priv->ipu_buf_num, phys); +} + +static irqreturn_t csi_idmac_eof_interrupt(int irq, void *dev_id) +{ + struct csi_priv *priv = dev_id; + + spin_lock(&priv->irqlock); + + if (priv->last_eof) { + complete(&priv->last_eof_comp); + priv->last_eof = false; + goto unlock; + } + + if (priv->fim) + /* call frame interval monitor */ + imx_media_fim_eof_monitor(priv->fim, ktime_get()); + + csi_vb2_buf_done(priv); + + /* select new IPU buf */ + ipu_idmac_select_buffer(priv->idmac_ch, priv->ipu_buf_num); + /* toggle IPU double-buffer index */ + priv->ipu_buf_num ^= 1; + + /* bump the EOF timeout timer */ + mod_timer(&priv->eof_timeout_timer, + jiffies + msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT)); + +unlock: + spin_unlock(&priv->irqlock); + return IRQ_HANDLED; +} + +static irqreturn_t csi_idmac_nfb4eof_interrupt(int irq, void *dev_id) +{ + struct csi_priv *priv = dev_id; + + spin_lock(&priv->irqlock); + + /* + * this is not an unrecoverable error, just mark + * the next captured frame with vb2 error flag. + */ + priv->nfb4eof = true; + + v4l2_err(&priv->sd, "NFB4EOF\n"); + + spin_unlock(&priv->irqlock); + + return IRQ_HANDLED; +} + +/* + * EOF timeout timer function. This is an unrecoverable condition + * without a stream restart. + */ +static void csi_idmac_eof_timeout(struct timer_list *t) +{ + struct csi_priv *priv = from_timer(priv, t, eof_timeout_timer); + struct imx_media_video_dev *vdev = priv->vdev; + + v4l2_err(&priv->sd, "EOF timeout\n"); + + /* signal a fatal error to capture device */ + imx_media_capture_device_error(vdev); +} + +static void csi_idmac_setup_vb2_buf(struct csi_priv *priv, dma_addr_t *phys) +{ + struct imx_media_video_dev *vdev = priv->vdev; + struct imx_media_buffer *buf; + int i; + + for (i = 0; i < 2; i++) { + buf = imx_media_capture_device_next_buf(vdev); + if (buf) { + priv->active_vb2_buf[i] = buf; + phys[i] = vb2_dma_contig_plane_dma_addr( + &buf->vbuf.vb2_buf, 0); + } else { + priv->active_vb2_buf[i] = NULL; + phys[i] = priv->underrun_buf.phys; + } + } +} + +static void csi_idmac_unsetup_vb2_buf(struct csi_priv *priv, + enum vb2_buffer_state return_status) +{ + struct imx_media_buffer *buf; + int i; + + /* return any remaining active frames with return_status */ + for (i = 0; i < 2; i++) { + buf = priv->active_vb2_buf[i]; + if (buf) { + struct vb2_buffer *vb = &buf->vbuf.vb2_buf; + + vb->timestamp = ktime_get_ns(); + vb2_buffer_done(vb, return_status); + } + } +} + +/* init the SMFC IDMAC channel */ +static int csi_idmac_setup_channel(struct csi_priv *priv) +{ + struct imx_media_video_dev *vdev = priv->vdev; + const struct imx_media_pixfmt *incc; + struct v4l2_mbus_framefmt *infmt; + struct v4l2_mbus_framefmt *outfmt; + bool passthrough, interweave; + struct ipu_image image; + u32 passthrough_bits; + u32 passthrough_cycles; + dma_addr_t phys[2]; + u32 burst_size; + int ret; + + infmt = &priv->format_mbus[CSI_SINK_PAD]; + incc = priv->cc[CSI_SINK_PAD]; + outfmt = &priv->format_mbus[CSI_SRC_PAD_IDMAC]; + + ipu_cpmem_zero(priv->idmac_ch); + + memset(&image, 0, sizeof(image)); + image.pix = vdev->fmt; + image.rect = vdev->compose; + + csi_idmac_setup_vb2_buf(priv, phys); + + image.phys0 = phys[0]; + image.phys1 = phys[1]; + + passthrough = requires_passthrough(&priv->upstream_ep, infmt, incc); + passthrough_cycles = 1; + + /* + * If the field type at capture interface is interlaced, and + * the output IDMAC pad is sequential, enable interweave at + * the IDMAC output channel. + */ + interweave = V4L2_FIELD_IS_INTERLACED(image.pix.field) && + V4L2_FIELD_IS_SEQUENTIAL(outfmt->field); + priv->interweave_swap = interweave && + image.pix.field == V4L2_FIELD_INTERLACED_BT; + + switch (image.pix.pixelformat) { + case V4L2_PIX_FMT_SBGGR8: + case V4L2_PIX_FMT_SGBRG8: + case V4L2_PIX_FMT_SGRBG8: + case V4L2_PIX_FMT_SRGGB8: + case V4L2_PIX_FMT_GREY: + burst_size = 16; + passthrough_bits = 8; + break; + case V4L2_PIX_FMT_SBGGR16: + case V4L2_PIX_FMT_SGBRG16: + case V4L2_PIX_FMT_SGRBG16: + case V4L2_PIX_FMT_SRGGB16: + case V4L2_PIX_FMT_Y10: + case V4L2_PIX_FMT_Y12: + burst_size = 8; + passthrough_bits = 16; + break; + case V4L2_PIX_FMT_YUV420: + case V4L2_PIX_FMT_YVU420: + case V4L2_PIX_FMT_NV12: + burst_size = (image.pix.width & 0x3f) ? + ((image.pix.width & 0x1f) ? + ((image.pix.width & 0xf) ? 8 : 16) : 32) : 64; + passthrough_bits = 16; + /* + * Skip writing U and V components to odd rows (but not + * when enabling IDMAC interweaving, they are incompatible). + */ + if (!interweave) + ipu_cpmem_skip_odd_chroma_rows(priv->idmac_ch); + break; + case V4L2_PIX_FMT_YUYV: + case V4L2_PIX_FMT_UYVY: + burst_size = (image.pix.width & 0x1f) ? + ((image.pix.width & 0xf) ? 8 : 16) : 32; + passthrough_bits = 16; + break; + case V4L2_PIX_FMT_RGB565: + if (passthrough) { + burst_size = 16; + passthrough_bits = 8; + passthrough_cycles = incc->cycles; + break; + } + fallthrough; /* non-passthrough RGB565 (CSI-2 bus) */ + default: + burst_size = (image.pix.width & 0xf) ? 8 : 16; + passthrough_bits = 16; + break; + } + + if (passthrough) { + if (priv->interweave_swap) { + /* start interweave scan at 1st top line (2nd line) */ + image.phys0 += image.pix.bytesperline; + image.phys1 += image.pix.bytesperline; + } + + ipu_cpmem_set_resolution(priv->idmac_ch, + image.rect.width * passthrough_cycles, + image.rect.height); + ipu_cpmem_set_stride(priv->idmac_ch, image.pix.bytesperline); + ipu_cpmem_set_buffer(priv->idmac_ch, 0, image.phys0); + ipu_cpmem_set_buffer(priv->idmac_ch, 1, image.phys1); + ipu_cpmem_set_format_passthrough(priv->idmac_ch, + passthrough_bits); + } else { + if (priv->interweave_swap) { + /* start interweave scan at 1st top line (2nd line) */ + image.rect.top = 1; + } + + ret = ipu_cpmem_set_image(priv->idmac_ch, &image); + if (ret) + goto unsetup_vb2; + } + + ipu_cpmem_set_burstsize(priv->idmac_ch, burst_size); + + /* + * Set the channel for the direct CSI-->memory via SMFC + * use-case to very high priority, by enabling the watermark + * signal in the SMFC, enabling WM in the channel, and setting + * the channel priority to high. + * + * Refer to the i.mx6 rev. D TRM Table 36-8: Calculated priority + * value. + * + * The WM's are set very low by intention here to ensure that + * the SMFC FIFOs do not overflow. + */ + ipu_smfc_set_watermark(priv->smfc, 0x02, 0x01); + ipu_cpmem_set_high_priority(priv->idmac_ch); + ipu_idmac_enable_watermark(priv->idmac_ch, true); + ipu_cpmem_set_axi_id(priv->idmac_ch, 0); + + burst_size = passthrough ? + (burst_size >> 3) - 1 : (burst_size >> 2) - 1; + + ipu_smfc_set_burstsize(priv->smfc, burst_size); + + if (interweave) + ipu_cpmem_interlaced_scan(priv->idmac_ch, + priv->interweave_swap ? + -image.pix.bytesperline : + image.pix.bytesperline, + image.pix.pixelformat); + + ipu_idmac_set_double_buffer(priv->idmac_ch, true); + + return 0; + +unsetup_vb2: + csi_idmac_unsetup_vb2_buf(priv, VB2_BUF_STATE_QUEUED); + return ret; +} + +static void csi_idmac_unsetup(struct csi_priv *priv, + enum vb2_buffer_state state) +{ + ipu_idmac_disable_channel(priv->idmac_ch); + ipu_smfc_disable(priv->smfc); + + csi_idmac_unsetup_vb2_buf(priv, state); +} + +static int csi_idmac_setup(struct csi_priv *priv) +{ + int ret; + + ret = csi_idmac_setup_channel(priv); + if (ret) + return ret; + + ipu_cpmem_dump(priv->idmac_ch); + ipu_dump(priv->ipu); + + ipu_smfc_enable(priv->smfc); + + /* set buffers ready */ + ipu_idmac_select_buffer(priv->idmac_ch, 0); + ipu_idmac_select_buffer(priv->idmac_ch, 1); + + /* enable the channels */ + ipu_idmac_enable_channel(priv->idmac_ch); + + return 0; +} + +static int csi_idmac_start(struct csi_priv *priv) +{ + struct imx_media_video_dev *vdev = priv->vdev; + int ret; + + ret = csi_idmac_get_ipu_resources(priv); + if (ret) + return ret; + + ipu_smfc_map_channel(priv->smfc, priv->csi_id, priv->vc_num); + + ret = imx_media_alloc_dma_buf(priv->dev, &priv->underrun_buf, + vdev->fmt.sizeimage); + if (ret) + goto out_put_ipu; + + priv->ipu_buf_num = 0; + + /* init EOF completion waitq */ + init_completion(&priv->last_eof_comp); + priv->frame_sequence = 0; + priv->last_eof = false; + priv->nfb4eof = false; + + ret = csi_idmac_setup(priv); + if (ret) { + v4l2_err(&priv->sd, "csi_idmac_setup failed: %d\n", ret); + goto out_free_dma_buf; + } + + priv->nfb4eof_irq = ipu_idmac_channel_irq(priv->ipu, + priv->idmac_ch, + IPU_IRQ_NFB4EOF); + ret = devm_request_irq(priv->dev, priv->nfb4eof_irq, + csi_idmac_nfb4eof_interrupt, 0, + "imx-smfc-nfb4eof", priv); + if (ret) { + v4l2_err(&priv->sd, + "Error registering NFB4EOF irq: %d\n", ret); + goto out_unsetup; + } + + priv->eof_irq = ipu_idmac_channel_irq(priv->ipu, priv->idmac_ch, + IPU_IRQ_EOF); + + ret = devm_request_irq(priv->dev, priv->eof_irq, + csi_idmac_eof_interrupt, 0, + "imx-smfc-eof", priv); + if (ret) { + v4l2_err(&priv->sd, + "Error registering eof irq: %d\n", ret); + goto out_free_nfb4eof_irq; + } + + /* start the EOF timeout timer */ + mod_timer(&priv->eof_timeout_timer, + jiffies + msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT)); + + return 0; + +out_free_nfb4eof_irq: + devm_free_irq(priv->dev, priv->nfb4eof_irq, priv); +out_unsetup: + csi_idmac_unsetup(priv, VB2_BUF_STATE_QUEUED); +out_free_dma_buf: + imx_media_free_dma_buf(priv->dev, &priv->underrun_buf); +out_put_ipu: + csi_idmac_put_ipu_resources(priv); + return ret; +} + +static void csi_idmac_wait_last_eof(struct csi_priv *priv) +{ + unsigned long flags; + int ret; + + /* mark next EOF interrupt as the last before stream off */ + spin_lock_irqsave(&priv->irqlock, flags); + priv->last_eof = true; + spin_unlock_irqrestore(&priv->irqlock, flags); + + /* + * and then wait for interrupt handler to mark completion. + */ + ret = wait_for_completion_timeout( + &priv->last_eof_comp, msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT)); + if (ret == 0) + v4l2_warn(&priv->sd, "wait last EOF timeout\n"); +} + +static void csi_idmac_stop(struct csi_priv *priv) +{ + devm_free_irq(priv->dev, priv->eof_irq, priv); + devm_free_irq(priv->dev, priv->nfb4eof_irq, priv); + + csi_idmac_unsetup(priv, VB2_BUF_STATE_ERROR); + + imx_media_free_dma_buf(priv->dev, &priv->underrun_buf); + + /* cancel the EOF timeout timer */ + del_timer_sync(&priv->eof_timeout_timer); + + csi_idmac_put_ipu_resources(priv); +} + +/* Update the CSI whole sensor and active windows */ +static int csi_setup(struct csi_priv *priv) +{ + struct v4l2_mbus_framefmt *infmt, *outfmt; + const struct imx_media_pixfmt *incc; + struct v4l2_mbus_config mbus_cfg; + struct v4l2_mbus_framefmt if_fmt; + struct v4l2_rect crop; + + infmt = &priv->format_mbus[CSI_SINK_PAD]; + incc = priv->cc[CSI_SINK_PAD]; + outfmt = &priv->format_mbus[priv->active_output_pad]; + + /* compose mbus_config from the upstream endpoint */ + mbus_cfg.type = priv->upstream_ep.bus_type; + if (is_parallel_bus(&priv->upstream_ep)) + mbus_cfg.bus.parallel = priv->upstream_ep.bus.parallel; + else + mbus_cfg.bus.mipi_csi2 = priv->upstream_ep.bus.mipi_csi2; + + if_fmt = *infmt; + crop = priv->crop; + + /* + * if cycles is set, we need to handle this over multiple cycles as + * generic/bayer data + */ + if (is_parallel_bus(&priv->upstream_ep) && incc->cycles) { + if_fmt.width *= incc->cycles; + crop.width *= incc->cycles; + } + + ipu_csi_set_window(priv->csi, &crop); + + ipu_csi_set_downsize(priv->csi, + priv->crop.width == 2 * priv->compose.width, + priv->crop.height == 2 * priv->compose.height); + + ipu_csi_init_interface(priv->csi, &mbus_cfg, &if_fmt, outfmt); + + ipu_csi_set_dest(priv->csi, priv->dest); + + if (priv->dest == IPU_CSI_DEST_IDMAC) + ipu_csi_set_skip_smfc(priv->csi, priv->skip->skip_smfc, + priv->skip->max_ratio - 1, 0); + + ipu_csi_dump(priv->csi); + + return 0; +} + +static int csi_start(struct csi_priv *priv) +{ + struct v4l2_fract *input_fi, *output_fi; + int ret; + + input_fi = &priv->frame_interval[CSI_SINK_PAD]; + output_fi = &priv->frame_interval[priv->active_output_pad]; + + /* start upstream */ + ret = v4l2_subdev_call(priv->src_sd, video, s_stream, 1); + ret = (ret && ret != -ENOIOCTLCMD) ? ret : 0; + if (ret) + return ret; + + /* Skip first few frames from a BT.656 source */ + if (priv->upstream_ep.bus_type == V4L2_MBUS_BT656) { + u32 delay_usec, bad_frames = 20; + + delay_usec = DIV_ROUND_UP_ULL((u64)USEC_PER_SEC * + input_fi->numerator * bad_frames, + input_fi->denominator); + + usleep_range(delay_usec, delay_usec + 1000); + } + + if (priv->dest == IPU_CSI_DEST_IDMAC) { + ret = csi_idmac_start(priv); + if (ret) + goto stop_upstream; + } + + ret = csi_setup(priv); + if (ret) + goto idmac_stop; + + /* start the frame interval monitor */ + if (priv->fim && priv->dest == IPU_CSI_DEST_IDMAC) { + ret = imx_media_fim_set_stream(priv->fim, output_fi, true); + if (ret) + goto idmac_stop; + } + + ret = ipu_csi_enable(priv->csi); + if (ret) { + v4l2_err(&priv->sd, "CSI enable error: %d\n", ret); + goto fim_off; + } + + return 0; + +fim_off: + if (priv->fim && priv->dest == IPU_CSI_DEST_IDMAC) + imx_media_fim_set_stream(priv->fim, NULL, false); +idmac_stop: + if (priv->dest == IPU_CSI_DEST_IDMAC) + csi_idmac_stop(priv); +stop_upstream: + v4l2_subdev_call(priv->src_sd, video, s_stream, 0); + return ret; +} + +static void csi_stop(struct csi_priv *priv) +{ + if (priv->dest == IPU_CSI_DEST_IDMAC) + csi_idmac_wait_last_eof(priv); + + /* + * Disable the CSI asap, after syncing with the last EOF. + * Doing so after the IDMA channel is disabled has shown to + * create hard system-wide hangs. + */ + ipu_csi_disable(priv->csi); + + /* stop upstream */ + v4l2_subdev_call(priv->src_sd, video, s_stream, 0); + + if (priv->dest == IPU_CSI_DEST_IDMAC) { + csi_idmac_stop(priv); + + /* stop the frame interval monitor */ + if (priv->fim) + imx_media_fim_set_stream(priv->fim, NULL, false); + } +} + +static const struct csi_skip_desc csi_skip[12] = { + { 1, 1, 0x00 }, /* Keep all frames */ + { 5, 6, 0x10 }, /* Skip every sixth frame */ + { 4, 5, 0x08 }, /* Skip every fifth frame */ + { 3, 4, 0x04 }, /* Skip every fourth frame */ + { 2, 3, 0x02 }, /* Skip every third frame */ + { 3, 5, 0x0a }, /* Skip frames 1 and 3 of every 5 */ + { 1, 2, 0x01 }, /* Skip every second frame */ + { 2, 5, 0x0b }, /* Keep frames 1 and 4 of every 5 */ + { 1, 3, 0x03 }, /* Keep one in three frames */ + { 1, 4, 0x07 }, /* Keep one in four frames */ + { 1, 5, 0x0f }, /* Keep one in five frames */ + { 1, 6, 0x1f }, /* Keep one in six frames */ +}; + +static void csi_apply_skip_interval(const struct csi_skip_desc *skip, + struct v4l2_fract *interval) +{ + unsigned int div; + + interval->numerator *= skip->max_ratio; + interval->denominator *= skip->keep; + + /* Reduce fraction to lowest terms */ + div = gcd(interval->numerator, interval->denominator); + if (div > 1) { + interval->numerator /= div; + interval->denominator /= div; + } +} + +/* + * Find the skip pattern to produce the output frame interval closest to the + * requested one, for the given input frame interval. Updates the output frame + * interval to the exact value. + */ +static const struct csi_skip_desc *csi_find_best_skip(struct v4l2_fract *in, + struct v4l2_fract *out) +{ + const struct csi_skip_desc *skip = &csi_skip[0], *best_skip = skip; + u32 min_err = UINT_MAX; + u64 want_us; + int i; + + /* Default to 1:1 ratio */ + if (out->numerator == 0 || out->denominator == 0 || + in->numerator == 0 || in->denominator == 0) { + *out = *in; + return best_skip; + } + + want_us = div_u64((u64)USEC_PER_SEC * out->numerator, out->denominator); + + /* Find the reduction closest to the requested time per frame */ + for (i = 0; i < ARRAY_SIZE(csi_skip); i++, skip++) { + u64 tmp, err; + + tmp = div_u64((u64)USEC_PER_SEC * in->numerator * + skip->max_ratio, in->denominator * skip->keep); + + err = abs((s64)tmp - want_us); + if (err < min_err) { + min_err = err; + best_skip = skip; + } + } + + *out = *in; + csi_apply_skip_interval(best_skip, out); + + return best_skip; +} + +/* + * V4L2 subdev operations. + */ + +static int csi_g_frame_interval(struct v4l2_subdev *sd, + struct v4l2_subdev_frame_interval *fi) +{ + struct csi_priv *priv = v4l2_get_subdevdata(sd); + + if (fi->pad >= CSI_NUM_PADS) + return -EINVAL; + + mutex_lock(&priv->lock); + + fi->interval = priv->frame_interval[fi->pad]; + + mutex_unlock(&priv->lock); + + return 0; +} + +static int csi_s_frame_interval(struct v4l2_subdev *sd, + struct v4l2_subdev_frame_interval *fi) +{ + struct csi_priv *priv = v4l2_get_subdevdata(sd); + struct v4l2_fract *input_fi; + int ret = 0; + + mutex_lock(&priv->lock); + + input_fi = &priv->frame_interval[CSI_SINK_PAD]; + + switch (fi->pad) { + case CSI_SINK_PAD: + /* No limits on valid input frame intervals */ + if (fi->interval.numerator == 0 || + fi->interval.denominator == 0) + fi->interval = *input_fi; + /* Reset output intervals and frame skipping ratio to 1:1 */ + priv->frame_interval[CSI_SRC_PAD_IDMAC] = fi->interval; + priv->frame_interval[CSI_SRC_PAD_DIRECT] = fi->interval; + priv->skip = &csi_skip[0]; + break; + case CSI_SRC_PAD_IDMAC: + /* + * frame interval at IDMAC output pad depends on input + * interval, modified by frame skipping. + */ + priv->skip = csi_find_best_skip(input_fi, &fi->interval); + break; + case CSI_SRC_PAD_DIRECT: + /* + * frame interval at DIRECT output pad is same as input + * interval. + */ + fi->interval = *input_fi; + break; + default: + ret = -EINVAL; + goto out; + } + + priv->frame_interval[fi->pad] = fi->interval; +out: + mutex_unlock(&priv->lock); + return ret; +} + +static int csi_s_stream(struct v4l2_subdev *sd, int enable) +{ + struct csi_priv *priv = v4l2_get_subdevdata(sd); + int ret = 0; + + mutex_lock(&priv->lock); + + if (!priv->src_sd || !priv->sink) { + ret = -EPIPE; + goto out; + } + + /* + * enable/disable streaming only if stream_count is + * going from 0 to 1 / 1 to 0. + */ + if (priv->stream_count != !enable) + goto update_count; + + if (enable) { + dev_dbg(priv->dev, "stream ON\n"); + ret = csi_start(priv); + if (ret) + goto out; + } else { + dev_dbg(priv->dev, "stream OFF\n"); + csi_stop(priv); + } + +update_count: + priv->stream_count += enable ? 1 : -1; + if (priv->stream_count < 0) + priv->stream_count = 0; +out: + mutex_unlock(&priv->lock); + return ret; +} + +static int csi_link_setup(struct media_entity *entity, + const struct media_pad *local, + const struct media_pad *remote, u32 flags) +{ + struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity); + struct csi_priv *priv = v4l2_get_subdevdata(sd); + struct v4l2_subdev *remote_sd; + int ret = 0; + + dev_dbg(priv->dev, "link setup %s -> %s\n", remote->entity->name, + local->entity->name); + + mutex_lock(&priv->lock); + + if (local->flags & MEDIA_PAD_FL_SINK) { + if (!is_media_entity_v4l2_subdev(remote->entity)) { + ret = -EINVAL; + goto out; + } + + remote_sd = media_entity_to_v4l2_subdev(remote->entity); + + if (flags & MEDIA_LNK_FL_ENABLED) { + if (priv->src_sd) { + ret = -EBUSY; + goto out; + } + priv->src_sd = remote_sd; + } else { + priv->src_sd = NULL; + } + + goto out; + } + + /* this is a source pad */ + + if (flags & MEDIA_LNK_FL_ENABLED) { + if (priv->sink) { + ret = -EBUSY; + goto out; + } + } else { + v4l2_ctrl_handler_free(&priv->ctrl_hdlr); + v4l2_ctrl_handler_init(&priv->ctrl_hdlr, 0); + priv->sink = NULL; + /* do not apply IC burst alignment in csi_try_crop */ + priv->active_output_pad = CSI_SRC_PAD_IDMAC; + goto out; + } + + /* record which output pad is now active */ + priv->active_output_pad = local->index; + + /* set CSI destination */ + if (local->index == CSI_SRC_PAD_IDMAC) { + if (!is_media_entity_v4l2_video_device(remote->entity)) { + ret = -EINVAL; + goto out; + } + + if (priv->fim) { + ret = imx_media_fim_add_controls(priv->fim); + if (ret) + goto out; + } + + priv->dest = IPU_CSI_DEST_IDMAC; + } else { + if (!is_media_entity_v4l2_subdev(remote->entity)) { + ret = -EINVAL; + goto out; + } + + remote_sd = media_entity_to_v4l2_subdev(remote->entity); + switch (remote_sd->grp_id) { + case IMX_MEDIA_GRP_ID_IPU_VDIC: + priv->dest = IPU_CSI_DEST_VDIC; + break; + case IMX_MEDIA_GRP_ID_IPU_IC_PRP: + priv->dest = IPU_CSI_DEST_IC; + break; + default: + ret = -EINVAL; + goto out; + } + } + + priv->sink = remote->entity; +out: + mutex_unlock(&priv->lock); + return ret; +} + +static int csi_link_validate(struct v4l2_subdev *sd, + struct media_link *link, + struct v4l2_subdev_format *source_fmt, + struct v4l2_subdev_format *sink_fmt) +{ + struct csi_priv *priv = v4l2_get_subdevdata(sd); + struct v4l2_fwnode_endpoint upstream_ep = { .bus_type = 0 }; + bool is_csi2; + int ret; + + ret = v4l2_subdev_link_validate_default(sd, link, + source_fmt, sink_fmt); + if (ret) + return ret; + + ret = csi_get_upstream_endpoint(priv, &upstream_ep); + if (ret) { + v4l2_err(&priv->sd, "failed to find upstream endpoint\n"); + return ret; + } + + mutex_lock(&priv->lock); + + priv->upstream_ep = upstream_ep; + is_csi2 = !is_parallel_bus(&upstream_ep); + if (is_csi2) { + /* + * NOTE! It seems the virtual channels from the mipi csi-2 + * receiver are used only for routing by the video mux's, + * or for hard-wired routing to the CSI's. Once the stream + * enters the CSI's however, they are treated internally + * in the IPU as virtual channel 0. + */ + ipu_csi_set_mipi_datatype(priv->csi, 0, + &priv->format_mbus[CSI_SINK_PAD]); + } + + /* select either parallel or MIPI-CSI2 as input to CSI */ + ipu_set_csi_src_mux(priv->ipu, priv->csi_id, is_csi2); + + mutex_unlock(&priv->lock); + return ret; +} + +static struct v4l2_mbus_framefmt * +__csi_get_fmt(struct csi_priv *priv, struct v4l2_subdev_state *sd_state, + unsigned int pad, enum v4l2_subdev_format_whence which) +{ + if (which == V4L2_SUBDEV_FORMAT_TRY) + return v4l2_subdev_get_try_format(&priv->sd, sd_state, pad); + else + return &priv->format_mbus[pad]; +} + +static struct v4l2_rect * +__csi_get_crop(struct csi_priv *priv, struct v4l2_subdev_state *sd_state, + enum v4l2_subdev_format_whence which) +{ + if (which == V4L2_SUBDEV_FORMAT_TRY) + return v4l2_subdev_get_try_crop(&priv->sd, sd_state, + CSI_SINK_PAD); + else + return &priv->crop; +} + +static struct v4l2_rect * +__csi_get_compose(struct csi_priv *priv, struct v4l2_subdev_state *sd_state, + enum v4l2_subdev_format_whence which) +{ + if (which == V4L2_SUBDEV_FORMAT_TRY) + return v4l2_subdev_get_try_compose(&priv->sd, sd_state, + CSI_SINK_PAD); + else + return &priv->compose; +} + +static void csi_try_crop(struct csi_priv *priv, + struct v4l2_rect *crop, + struct v4l2_subdev_state *sd_state, + struct v4l2_mbus_framefmt *infmt, + struct v4l2_fwnode_endpoint *upstream_ep) +{ + u32 in_height; + + crop->width = min_t(__u32, infmt->width, crop->width); + if (crop->left + crop->width > infmt->width) + crop->left = infmt->width - crop->width; + /* adjust crop left/width to h/w alignment restrictions */ + crop->left &= ~0x3; + if (priv->active_output_pad == CSI_SRC_PAD_DIRECT) + crop->width &= ~0x7; /* multiple of 8 pixels (IC burst) */ + else + crop->width &= ~0x1; /* multiple of 2 pixels */ + + in_height = infmt->height; + if (infmt->field == V4L2_FIELD_ALTERNATE) + in_height *= 2; + + /* + * FIXME: not sure why yet, but on interlaced bt.656, + * changing the vertical cropping causes loss of vertical + * sync, so fix it to NTSC/PAL active lines. NTSC contains + * 2 extra lines of active video that need to be cropped. + */ + if (upstream_ep->bus_type == V4L2_MBUS_BT656 && + (V4L2_FIELD_HAS_BOTH(infmt->field) || + infmt->field == V4L2_FIELD_ALTERNATE)) { + crop->height = in_height; + crop->top = (in_height == 480) ? 2 : 0; + } else { + crop->height = min_t(__u32, in_height, crop->height); + if (crop->top + crop->height > in_height) + crop->top = in_height - crop->height; + } +} + +static int csi_enum_mbus_code(struct v4l2_subdev *sd, + struct v4l2_subdev_state *sd_state, + struct v4l2_subdev_mbus_code_enum *code) +{ + struct csi_priv *priv = v4l2_get_subdevdata(sd); + struct v4l2_fwnode_endpoint upstream_ep = { .bus_type = 0 }; + const struct imx_media_pixfmt *incc; + struct v4l2_mbus_framefmt *infmt; + int ret = 0; + + mutex_lock(&priv->lock); + + infmt = __csi_get_fmt(priv, sd_state, CSI_SINK_PAD, code->which); + incc = imx_media_find_mbus_format(infmt->code, PIXFMT_SEL_ANY); + + switch (code->pad) { + case CSI_SINK_PAD: + ret = imx_media_enum_mbus_formats(&code->code, code->index, + PIXFMT_SEL_ANY); + break; + case CSI_SRC_PAD_DIRECT: + case CSI_SRC_PAD_IDMAC: + ret = csi_get_upstream_endpoint(priv, &upstream_ep); + if (ret) { + v4l2_err(&priv->sd, "failed to find upstream endpoint\n"); + goto out; + } + + if (requires_passthrough(&upstream_ep, infmt, incc)) { + if (code->index != 0) { + ret = -EINVAL; + goto out; + } + code->code = infmt->code; + } else { + enum imx_pixfmt_sel fmt_sel = + (incc->cs == IPUV3_COLORSPACE_YUV) ? + PIXFMT_SEL_YUV : PIXFMT_SEL_RGB; + + ret = imx_media_enum_ipu_formats(&code->code, + code->index, + fmt_sel); + } + break; + default: + ret = -EINVAL; + } + +out: + mutex_unlock(&priv->lock); + return ret; +} + +static int csi_enum_frame_size(struct v4l2_subdev *sd, + struct v4l2_subdev_state *sd_state, + struct v4l2_subdev_frame_size_enum *fse) +{ + struct csi_priv *priv = v4l2_get_subdevdata(sd); + struct v4l2_rect *crop; + int ret = 0; + + if (fse->pad >= CSI_NUM_PADS || + fse->index > (fse->pad == CSI_SINK_PAD ? 0 : 3)) + return -EINVAL; + + mutex_lock(&priv->lock); + + if (fse->pad == CSI_SINK_PAD) { + fse->min_width = MIN_W; + fse->max_width = MAX_W; + fse->min_height = MIN_H; + fse->max_height = MAX_H; + } else { + crop = __csi_get_crop(priv, sd_state, fse->which); + + fse->min_width = fse->index & 1 ? + crop->width / 2 : crop->width; + fse->max_width = fse->min_width; + fse->min_height = fse->index & 2 ? + crop->height / 2 : crop->height; + fse->max_height = fse->min_height; + } + + mutex_unlock(&priv->lock); + return ret; +} + +static int csi_enum_frame_interval(struct v4l2_subdev *sd, + struct v4l2_subdev_state *sd_state, + struct v4l2_subdev_frame_interval_enum *fie) +{ + struct csi_priv *priv = v4l2_get_subdevdata(sd); + struct v4l2_fract *input_fi; + struct v4l2_rect *crop; + int ret = 0; + + if (fie->pad >= CSI_NUM_PADS || + fie->index >= (fie->pad != CSI_SRC_PAD_IDMAC ? + 1 : ARRAY_SIZE(csi_skip))) + return -EINVAL; + + mutex_lock(&priv->lock); + + input_fi = &priv->frame_interval[CSI_SINK_PAD]; + crop = __csi_get_crop(priv, sd_state, fie->which); + + if ((fie->width != crop->width && fie->width != crop->width / 2) || + (fie->height != crop->height && fie->height != crop->height / 2)) { + ret = -EINVAL; + goto out; + } + + fie->interval = *input_fi; + + if (fie->pad == CSI_SRC_PAD_IDMAC) + csi_apply_skip_interval(&csi_skip[fie->index], + &fie->interval); + +out: + mutex_unlock(&priv->lock); + return ret; +} + +static int csi_get_fmt(struct v4l2_subdev *sd, + struct v4l2_subdev_state *sd_state, + struct v4l2_subdev_format *sdformat) +{ + struct csi_priv *priv = v4l2_get_subdevdata(sd); + struct v4l2_mbus_framefmt *fmt; + int ret = 0; + + if (sdformat->pad >= CSI_NUM_PADS) + return -EINVAL; + + mutex_lock(&priv->lock); + + fmt = __csi_get_fmt(priv, sd_state, sdformat->pad, sdformat->which); + if (!fmt) { + ret = -EINVAL; + goto out; + } + + sdformat->format = *fmt; +out: + mutex_unlock(&priv->lock); + return ret; +} + +static void csi_try_field(struct csi_priv *priv, + struct v4l2_subdev_state *sd_state, + struct v4l2_subdev_format *sdformat) +{ + struct v4l2_mbus_framefmt *infmt = + __csi_get_fmt(priv, sd_state, CSI_SINK_PAD, sdformat->which); + + /* + * no restrictions on sink pad field type except must + * be initialized. + */ + if (sdformat->pad == CSI_SINK_PAD) { + if (sdformat->format.field == V4L2_FIELD_ANY) + sdformat->format.field = V4L2_FIELD_NONE; + return; + } + + switch (infmt->field) { + case V4L2_FIELD_SEQ_TB: + case V4L2_FIELD_SEQ_BT: + /* + * If the user requests sequential at the source pad, + * allow it (along with possibly inverting field order). + * Otherwise passthrough the field type. + */ + if (!V4L2_FIELD_IS_SEQUENTIAL(sdformat->format.field)) + sdformat->format.field = infmt->field; + break; + case V4L2_FIELD_ALTERNATE: + /* + * This driver does not support alternate field mode, and + * the CSI captures a whole frame, so the CSI never presents + * alternate mode at its source pads. If user has not + * already requested sequential, translate ALTERNATE at + * sink pad to SEQ_TB or SEQ_BT at the source pad depending + * on input height (assume NTSC BT order if 480 total active + * frame lines, otherwise PAL TB order). + */ + if (!V4L2_FIELD_IS_SEQUENTIAL(sdformat->format.field)) + sdformat->format.field = (infmt->height == 480 / 2) ? + V4L2_FIELD_SEQ_BT : V4L2_FIELD_SEQ_TB; + break; + default: + /* Passthrough for all other input field types */ + sdformat->format.field = infmt->field; + break; + } +} + +static void csi_try_fmt(struct csi_priv *priv, + struct v4l2_fwnode_endpoint *upstream_ep, + struct v4l2_subdev_state *sd_state, + struct v4l2_subdev_format *sdformat, + struct v4l2_rect *crop, + struct v4l2_rect *compose, + const struct imx_media_pixfmt **cc) +{ + const struct imx_media_pixfmt *incc; + struct v4l2_mbus_framefmt *infmt; + u32 code; + + infmt = __csi_get_fmt(priv, sd_state, CSI_SINK_PAD, sdformat->which); + + switch (sdformat->pad) { + case CSI_SRC_PAD_DIRECT: + case CSI_SRC_PAD_IDMAC: + incc = imx_media_find_mbus_format(infmt->code, PIXFMT_SEL_ANY); + + sdformat->format.width = compose->width; + sdformat->format.height = compose->height; + + if (requires_passthrough(upstream_ep, infmt, incc)) { + sdformat->format.code = infmt->code; + *cc = incc; + } else { + enum imx_pixfmt_sel fmt_sel = + (incc->cs == IPUV3_COLORSPACE_YUV) ? + PIXFMT_SEL_YUV : PIXFMT_SEL_RGB; + + *cc = imx_media_find_ipu_format(sdformat->format.code, + fmt_sel); + if (!*cc) { + imx_media_enum_ipu_formats(&code, 0, fmt_sel); + *cc = imx_media_find_ipu_format(code, fmt_sel); + sdformat->format.code = (*cc)->codes[0]; + } + } + + csi_try_field(priv, sd_state, sdformat); + + /* propagate colorimetry from sink */ + sdformat->format.colorspace = infmt->colorspace; + sdformat->format.xfer_func = infmt->xfer_func; + sdformat->format.quantization = infmt->quantization; + sdformat->format.ycbcr_enc = infmt->ycbcr_enc; + + break; + case CSI_SINK_PAD: + v4l_bound_align_image(&sdformat->format.width, MIN_W, MAX_W, + W_ALIGN, &sdformat->format.height, + MIN_H, MAX_H, H_ALIGN, S_ALIGN); + + *cc = imx_media_find_mbus_format(sdformat->format.code, + PIXFMT_SEL_ANY); + if (!*cc) { + imx_media_enum_mbus_formats(&code, 0, + PIXFMT_SEL_YUV_RGB); + *cc = imx_media_find_mbus_format(code, + PIXFMT_SEL_YUV_RGB); + sdformat->format.code = (*cc)->codes[0]; + } + + csi_try_field(priv, sd_state, sdformat); + + /* Reset crop and compose rectangles */ + crop->left = 0; + crop->top = 0; + crop->width = sdformat->format.width; + crop->height = sdformat->format.height; + if (sdformat->format.field == V4L2_FIELD_ALTERNATE) + crop->height *= 2; + csi_try_crop(priv, crop, sd_state, &sdformat->format, + upstream_ep); + compose->left = 0; + compose->top = 0; + compose->width = crop->width; + compose->height = crop->height; + + break; + } + + imx_media_try_colorimetry(&sdformat->format, + priv->active_output_pad == CSI_SRC_PAD_DIRECT); +} + +static int csi_set_fmt(struct v4l2_subdev *sd, + struct v4l2_subdev_state *sd_state, + struct v4l2_subdev_format *sdformat) +{ + struct csi_priv *priv = v4l2_get_subdevdata(sd); + struct v4l2_fwnode_endpoint upstream_ep = { .bus_type = 0 }; + const struct imx_media_pixfmt *cc; + struct v4l2_mbus_framefmt *fmt; + struct v4l2_rect *crop, *compose; + int ret; + + if (sdformat->pad >= CSI_NUM_PADS) + return -EINVAL; + + ret = csi_get_upstream_endpoint(priv, &upstream_ep); + if (ret) { + v4l2_err(&priv->sd, "failed to find upstream endpoint\n"); + return ret; + } + + mutex_lock(&priv->lock); + + if (priv->stream_count > 0) { + ret = -EBUSY; + goto out; + } + + crop = __csi_get_crop(priv, sd_state, sdformat->which); + compose = __csi_get_compose(priv, sd_state, sdformat->which); + + csi_try_fmt(priv, &upstream_ep, sd_state, sdformat, crop, compose, + &cc); + + fmt = __csi_get_fmt(priv, sd_state, sdformat->pad, sdformat->which); + *fmt = sdformat->format; + + if (sdformat->pad == CSI_SINK_PAD) { + int pad; + + /* propagate format to source pads */ + for (pad = CSI_SINK_PAD + 1; pad < CSI_NUM_PADS; pad++) { + const struct imx_media_pixfmt *outcc; + struct v4l2_mbus_framefmt *outfmt; + struct v4l2_subdev_format format; + + format.pad = pad; + format.which = sdformat->which; + format.format = sdformat->format; + csi_try_fmt(priv, &upstream_ep, sd_state, &format, + NULL, compose, &outcc); + + outfmt = __csi_get_fmt(priv, sd_state, pad, + sdformat->which); + *outfmt = format.format; + + if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE) + priv->cc[pad] = outcc; + } + } + + if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE) + priv->cc[sdformat->pad] = cc; + +out: + mutex_unlock(&priv->lock); + return ret; +} + +static int csi_get_selection(struct v4l2_subdev *sd, + struct v4l2_subdev_state *sd_state, + struct v4l2_subdev_selection *sel) +{ + struct csi_priv *priv = v4l2_get_subdevdata(sd); + struct v4l2_mbus_framefmt *infmt; + struct v4l2_rect *crop, *compose; + int ret = 0; + + if (sel->pad != CSI_SINK_PAD) + return -EINVAL; + + mutex_lock(&priv->lock); + + infmt = __csi_get_fmt(priv, sd_state, CSI_SINK_PAD, sel->which); + crop = __csi_get_crop(priv, sd_state, sel->which); + compose = __csi_get_compose(priv, sd_state, sel->which); + + switch (sel->target) { + case V4L2_SEL_TGT_CROP_BOUNDS: + sel->r.left = 0; + sel->r.top = 0; + sel->r.width = infmt->width; + sel->r.height = infmt->height; + if (infmt->field == V4L2_FIELD_ALTERNATE) + sel->r.height *= 2; + break; + case V4L2_SEL_TGT_CROP: + sel->r = *crop; + break; + case V4L2_SEL_TGT_COMPOSE_BOUNDS: + sel->r.left = 0; + sel->r.top = 0; + sel->r.width = crop->width; + sel->r.height = crop->height; + break; + case V4L2_SEL_TGT_COMPOSE: + sel->r = *compose; + break; + default: + ret = -EINVAL; + } + + mutex_unlock(&priv->lock); + return ret; +} + +static int csi_set_scale(u32 *compose, u32 crop, u32 flags) +{ + if ((flags & (V4L2_SEL_FLAG_LE | V4L2_SEL_FLAG_GE)) == + (V4L2_SEL_FLAG_LE | V4L2_SEL_FLAG_GE) && + *compose != crop && *compose != crop / 2) + return -ERANGE; + + if (*compose <= crop / 2 || + (*compose < crop * 3 / 4 && !(flags & V4L2_SEL_FLAG_GE)) || + (*compose < crop && (flags & V4L2_SEL_FLAG_LE))) + *compose = crop / 2; + else + *compose = crop; + + return 0; +} + +static int csi_set_selection(struct v4l2_subdev *sd, + struct v4l2_subdev_state *sd_state, + struct v4l2_subdev_selection *sel) +{ + struct csi_priv *priv = v4l2_get_subdevdata(sd); + struct v4l2_fwnode_endpoint upstream_ep = { .bus_type = 0 }; + struct v4l2_mbus_framefmt *infmt; + struct v4l2_rect *crop, *compose; + int pad, ret; + + if (sel->pad != CSI_SINK_PAD) + return -EINVAL; + + ret = csi_get_upstream_endpoint(priv, &upstream_ep); + if (ret) { + v4l2_err(&priv->sd, "failed to find upstream endpoint\n"); + return ret; + } + + mutex_lock(&priv->lock); + + if (priv->stream_count > 0) { + ret = -EBUSY; + goto out; + } + + infmt = __csi_get_fmt(priv, sd_state, CSI_SINK_PAD, sel->which); + crop = __csi_get_crop(priv, sd_state, sel->which); + compose = __csi_get_compose(priv, sd_state, sel->which); + + switch (sel->target) { + case V4L2_SEL_TGT_CROP: + /* + * Modifying the crop rectangle always changes the format on + * the source pads. If the KEEP_CONFIG flag is set, just return + * the current crop rectangle. + */ + if (sel->flags & V4L2_SEL_FLAG_KEEP_CONFIG) { + sel->r = priv->crop; + if (sel->which == V4L2_SUBDEV_FORMAT_TRY) + *crop = sel->r; + goto out; + } + + csi_try_crop(priv, &sel->r, sd_state, infmt, &upstream_ep); + + *crop = sel->r; + + /* Reset scaling to 1:1 */ + compose->width = crop->width; + compose->height = crop->height; + break; + case V4L2_SEL_TGT_COMPOSE: + /* + * Modifying the compose rectangle always changes the format on + * the source pads. If the KEEP_CONFIG flag is set, just return + * the current compose rectangle. + */ + if (sel->flags & V4L2_SEL_FLAG_KEEP_CONFIG) { + sel->r = priv->compose; + if (sel->which == V4L2_SUBDEV_FORMAT_TRY) + *compose = sel->r; + goto out; + } + + sel->r.left = 0; + sel->r.top = 0; + ret = csi_set_scale(&sel->r.width, crop->width, sel->flags); + if (ret) + goto out; + ret = csi_set_scale(&sel->r.height, crop->height, sel->flags); + if (ret) + goto out; + + *compose = sel->r; + break; + default: + ret = -EINVAL; + goto out; + } + + /* Reset source pads to sink compose rectangle */ + for (pad = CSI_SINK_PAD + 1; pad < CSI_NUM_PADS; pad++) { + struct v4l2_mbus_framefmt *outfmt; + + outfmt = __csi_get_fmt(priv, sd_state, pad, sel->which); + outfmt->width = compose->width; + outfmt->height = compose->height; + } + +out: + mutex_unlock(&priv->lock); + return ret; +} + +static int csi_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh, + struct v4l2_event_subscription *sub) +{ + if (sub->type != V4L2_EVENT_IMX_FRAME_INTERVAL_ERROR) + return -EINVAL; + if (sub->id != 0) + return -EINVAL; + + return v4l2_event_subscribe(fh, sub, 0, NULL); +} + +static int csi_unsubscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh, + struct v4l2_event_subscription *sub) +{ + return v4l2_event_unsubscribe(fh, sub); +} + +static int csi_registered(struct v4l2_subdev *sd) +{ + struct csi_priv *priv = v4l2_get_subdevdata(sd); + struct ipu_csi *csi; + int i, ret; + u32 code; + + /* get handle to IPU CSI */ + csi = ipu_csi_get(priv->ipu, priv->csi_id); + if (IS_ERR(csi)) { + v4l2_err(&priv->sd, "failed to get CSI%d\n", priv->csi_id); + return PTR_ERR(csi); + } + priv->csi = csi; + + for (i = 0; i < CSI_NUM_PADS; i++) { + code = 0; + if (i != CSI_SINK_PAD) + imx_media_enum_ipu_formats(&code, 0, PIXFMT_SEL_YUV); + + /* set a default mbus format */ + ret = imx_media_init_mbus_fmt(&priv->format_mbus[i], + IMX_MEDIA_DEF_PIX_WIDTH, + IMX_MEDIA_DEF_PIX_HEIGHT, code, + V4L2_FIELD_NONE, &priv->cc[i]); + if (ret) + goto put_csi; + + /* init default frame interval */ + priv->frame_interval[i].numerator = 1; + priv->frame_interval[i].denominator = 30; + } + + /* disable frame skipping */ + priv->skip = &csi_skip[0]; + + /* init default crop and compose rectangle sizes */ + priv->crop.width = IMX_MEDIA_DEF_PIX_WIDTH; + priv->crop.height = IMX_MEDIA_DEF_PIX_HEIGHT; + priv->compose.width = IMX_MEDIA_DEF_PIX_WIDTH; + priv->compose.height = IMX_MEDIA_DEF_PIX_HEIGHT; + + priv->fim = imx_media_fim_init(&priv->sd); + if (IS_ERR(priv->fim)) { + ret = PTR_ERR(priv->fim); + goto put_csi; + } + + priv->vdev = imx_media_capture_device_init(priv->sd.dev, &priv->sd, + CSI_SRC_PAD_IDMAC, true); + if (IS_ERR(priv->vdev)) { + ret = PTR_ERR(priv->vdev); + goto free_fim; + } + + ret = imx_media_capture_device_register(priv->vdev, 0); + if (ret) + goto remove_vdev; + + return 0; + +remove_vdev: + imx_media_capture_device_remove(priv->vdev); +free_fim: + if (priv->fim) + imx_media_fim_free(priv->fim); +put_csi: + ipu_csi_put(priv->csi); + return ret; +} + +static void csi_unregistered(struct v4l2_subdev *sd) +{ + struct csi_priv *priv = v4l2_get_subdevdata(sd); + + imx_media_capture_device_unregister(priv->vdev); + imx_media_capture_device_remove(priv->vdev); + + if (priv->fim) + imx_media_fim_free(priv->fim); + + if (priv->csi) + ipu_csi_put(priv->csi); +} + +/* + * The CSI has only one fwnode endpoint, at the sink pad. Verify the + * endpoint belongs to us, and return CSI_SINK_PAD. + */ +static int csi_get_fwnode_pad(struct media_entity *entity, + struct fwnode_endpoint *endpoint) +{ + struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity); + struct csi_priv *priv = v4l2_get_subdevdata(sd); + struct fwnode_handle *csi_port = dev_fwnode(priv->dev); + struct fwnode_handle *csi_ep; + int ret; + + csi_ep = fwnode_get_next_child_node(csi_port, NULL); + + ret = endpoint->local_fwnode == csi_ep ? CSI_SINK_PAD : -ENXIO; + + fwnode_handle_put(csi_ep); + + return ret; +} + +static const struct media_entity_operations csi_entity_ops = { + .link_setup = csi_link_setup, + .link_validate = v4l2_subdev_link_validate, + .get_fwnode_pad = csi_get_fwnode_pad, +}; + +static const struct v4l2_subdev_core_ops csi_core_ops = { + .subscribe_event = csi_subscribe_event, + .unsubscribe_event = csi_unsubscribe_event, +}; + +static const struct v4l2_subdev_video_ops csi_video_ops = { + .g_frame_interval = csi_g_frame_interval, + .s_frame_interval = csi_s_frame_interval, + .s_stream = csi_s_stream, +}; + +static const struct v4l2_subdev_pad_ops csi_pad_ops = { + .init_cfg = imx_media_init_cfg, + .enum_mbus_code = csi_enum_mbus_code, + .enum_frame_size = csi_enum_frame_size, + .enum_frame_interval = csi_enum_frame_interval, + .get_fmt = csi_get_fmt, + .set_fmt = csi_set_fmt, + .get_selection = csi_get_selection, + .set_selection = csi_set_selection, + .link_validate = csi_link_validate, +}; + +static const struct v4l2_subdev_ops csi_subdev_ops = { + .core = &csi_core_ops, + .video = &csi_video_ops, + .pad = &csi_pad_ops, +}; + +static const struct v4l2_subdev_internal_ops csi_internal_ops = { + .registered = csi_registered, + .unregistered = csi_unregistered, +}; + +static int imx_csi_notify_bound(struct v4l2_async_notifier *notifier, + struct v4l2_subdev *sd, + struct v4l2_async_subdev *asd) +{ + struct csi_priv *priv = notifier_to_dev(notifier); + struct media_pad *sink = &priv->sd.entity.pads[CSI_SINK_PAD]; + + /* + * If the subdev is a video mux, it must be one of the CSI + * muxes. Mark it as such via its group id. + */ + if (sd->entity.function == MEDIA_ENT_F_VID_MUX) + sd->grp_id = IMX_MEDIA_GRP_ID_CSI_MUX; + + return v4l2_create_fwnode_links_to_pad(sd, sink, 0); +} + +static const struct v4l2_async_notifier_operations csi_notify_ops = { + .bound = imx_csi_notify_bound, +}; + +static int imx_csi_async_register(struct csi_priv *priv) +{ + struct v4l2_async_subdev *asd = NULL; + struct fwnode_handle *ep; + unsigned int port; + int ret; + + v4l2_async_nf_init(&priv->notifier); + + /* get this CSI's port id */ + ret = fwnode_property_read_u32(dev_fwnode(priv->dev), "reg", &port); + if (ret < 0) + return ret; + + ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(priv->dev->parent), + port, 0, + FWNODE_GRAPH_ENDPOINT_NEXT); + if (ep) { + asd = v4l2_async_nf_add_fwnode_remote(&priv->notifier, ep, + struct v4l2_async_subdev); + + fwnode_handle_put(ep); + + if (IS_ERR(asd)) { + ret = PTR_ERR(asd); + /* OK if asd already exists */ + if (ret != -EEXIST) + return ret; + } + } + + priv->notifier.ops = &csi_notify_ops; + + ret = v4l2_async_subdev_nf_register(&priv->sd, &priv->notifier); + if (ret) + return ret; + + return v4l2_async_register_subdev(&priv->sd); +} + +static int imx_csi_probe(struct platform_device *pdev) +{ + struct ipu_client_platformdata *pdata; + struct pinctrl *pinctrl; + struct csi_priv *priv; + int i, ret; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + platform_set_drvdata(pdev, &priv->sd); + priv->dev = &pdev->dev; + + ret = dma_set_coherent_mask(priv->dev, DMA_BIT_MASK(32)); + if (ret) + return ret; + + /* get parent IPU */ + priv->ipu = dev_get_drvdata(priv->dev->parent); + + /* get our CSI id */ + pdata = priv->dev->platform_data; + priv->csi_id = pdata->csi; + priv->smfc_id = (priv->csi_id == 0) ? 0 : 2; + + priv->active_output_pad = CSI_SRC_PAD_IDMAC; + + timer_setup(&priv->eof_timeout_timer, csi_idmac_eof_timeout, 0); + spin_lock_init(&priv->irqlock); + + v4l2_subdev_init(&priv->sd, &csi_subdev_ops); + v4l2_set_subdevdata(&priv->sd, priv); + priv->sd.internal_ops = &csi_internal_ops; + priv->sd.entity.ops = &csi_entity_ops; + priv->sd.entity.function = MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER; + priv->sd.dev = &pdev->dev; + priv->sd.fwnode = of_fwnode_handle(pdata->of_node); + priv->sd.owner = THIS_MODULE; + priv->sd.flags = V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS; + priv->sd.grp_id = priv->csi_id ? + IMX_MEDIA_GRP_ID_IPU_CSI1 : IMX_MEDIA_GRP_ID_IPU_CSI0; + imx_media_grp_id_to_sd_name(priv->sd.name, sizeof(priv->sd.name), + priv->sd.grp_id, ipu_get_num(priv->ipu)); + + for (i = 0; i < CSI_NUM_PADS; i++) + priv->pad[i].flags = (i == CSI_SINK_PAD) ? + MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE; + + ret = media_entity_pads_init(&priv->sd.entity, CSI_NUM_PADS, + priv->pad); + if (ret) + return ret; + + mutex_init(&priv->lock); + + v4l2_ctrl_handler_init(&priv->ctrl_hdlr, 0); + priv->sd.ctrl_handler = &priv->ctrl_hdlr; + + /* + * The IPUv3 driver did not assign an of_node to this + * device. As a result, pinctrl does not automatically + * configure our pin groups, so we need to do that manually + * here, after setting this device's of_node. + */ + priv->dev->of_node = pdata->of_node; + pinctrl = devm_pinctrl_get_select_default(priv->dev); + if (IS_ERR(pinctrl)) { + ret = PTR_ERR(pinctrl); + dev_dbg(priv->dev, + "devm_pinctrl_get_select_default() failed: %d\n", ret); + if (ret != -ENODEV) + goto free; + } + + ret = imx_csi_async_register(priv); + if (ret) + goto cleanup; + + return 0; + +cleanup: + v4l2_async_nf_unregister(&priv->notifier); + v4l2_async_nf_cleanup(&priv->notifier); +free: + v4l2_ctrl_handler_free(&priv->ctrl_hdlr); + mutex_destroy(&priv->lock); + return ret; +} + +static int imx_csi_remove(struct platform_device *pdev) +{ + struct v4l2_subdev *sd = platform_get_drvdata(pdev); + struct csi_priv *priv = sd_to_dev(sd); + + v4l2_ctrl_handler_free(&priv->ctrl_hdlr); + mutex_destroy(&priv->lock); + v4l2_async_nf_unregister(&priv->notifier); + v4l2_async_nf_cleanup(&priv->notifier); + v4l2_async_unregister_subdev(sd); + media_entity_cleanup(&sd->entity); + + return 0; +} + +static const struct platform_device_id imx_csi_ids[] = { + { .name = "imx-ipuv3-csi" }, + { }, +}; +MODULE_DEVICE_TABLE(platform, imx_csi_ids); + +static struct platform_driver imx_csi_driver = { + .probe = imx_csi_probe, + .remove = imx_csi_remove, + .id_table = imx_csi_ids, + .driver = { + .name = "imx-ipuv3-csi", + }, +}; +module_platform_driver(imx_csi_driver); + +MODULE_DESCRIPTION("i.MX CSI subdev driver"); +MODULE_AUTHOR("Steve Longerbeam <steve_longerbeam@mentor.com>"); +MODULE_LICENSE("GPL"); |