[PATCH v3 03/23] media: atmel: introduce microchip csi2dc driver

Eugen Hristev
2021-12-13T13:51:01Z

Microchip CSI2DC (CSI2 Demultiplexer Controller) is a misc bridge device
that converts a byte stream in IDI Synopsys format (coming from a CSI2HOST)
to a pixel stream that can be captured by a sensor controller.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
---
Changes in v3:
- on set format, disable setting the source sink.
- removed useless request to pm_request_idle
- fixed YUV DT
- added last frame debug info
- removed writing read only VPCOL and VPROW registers
- minor cosmetic changes

Changes in v2:
- implement try formats
- added parallel mode
- moved to fwlink endpoints
- many other minor corrections from Jacopo's review

Changes in this revision:
- addressed comments by Jacopo and Laurent as in this thread:
https://www.spinics.net/lists/linux-media/msg181044.html

Previous change log :
Changes in v5:
- only in bindings

Changes in v4:
- now using get_mbus_config ops to get data from the subdevice, like the
virtual channel id, and the clock type.
- now having possibility to select any of the RAW10 data modes
- at completion time, select which formats are also available in the subdevice,
and move to the dynamic list accordingly
- changed the pipeline integration, do not advertise subdev ready at probe time.
wait until completion is done, and then start a workqueue that will register
this device as a subdevice for the next element in pipeline.
- moved the s_power code into a different function called now csi2dc_power
that is called with CONFIG_PM functions. This is also called at completion,
to have the device ready in case CONFIG_PM is not selected on the platform.
- merged try_fmt into set_fmt
- driver cleanup, wrapped lines over 80 characters

Changes in v2:
- moved driver to platform/atmel
- fixed minor things as per Sakari's review
- still some things from v2 review are not yet addressed, to be followed up

drivers/media/platform/Makefile | 1 +
drivers/media/platform/atmel/Kconfig | 15 +
drivers/media/platform/atmel/Makefile | 1 +
.../media/platform/atmel/microchip-csi2dc.c | 806 ++++++++++++++++++
4 files changed, 823 insertions(+)
create mode 100644 drivers/media/platform/atmel/microchip-csi2dc.c

diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
index 832357240e89..b18e5f704145 100644
--- a/drivers/media/platform/Makefile
+++ b/drivers/media/platform/Makefile
@@ -69,6 +69,7 @@ obj-$(CONFIG_VIDEO_RCAR_VIN) += rcar-vin/
obj-$(CONFIG_VIDEO_ATMEL_ISC) += atmel/
obj-$(CONFIG_VIDEO_ATMEL_ISI) += atmel/
obj-$(CONFIG_VIDEO_ATMEL_XISC) += atmel/
+obj-$(CONFIG_VIDEO_MICROCHIP_CSI2DC) += atmel/

obj-$(CONFIG_VIDEO_STM32_DCMI) += stm32/

diff --git a/drivers/media/platform/atmel/Kconfig b/drivers/media/platform/atmel/Kconfig
index dda2f27da317..f83bee373d82 100644
--- a/drivers/media/platform/atmel/Kconfig
+++ b/drivers/media/platform/atmel/Kconfig
@@ -40,3 +40,18 @@ config VIDEO_ATMEL_ISI
help
This module makes the ATMEL Image Sensor Interface available
as a v4l2 device.
+
+config VIDEO_MICROCHIP_CSI2DC
+ tristate "Microchip CSI2 Demux Controller"
+ depends on VIDEO_V4L2 && COMMON_CLK && OF
+ depends on ARCH_AT91 || COMPILE_TEST
+ select MEDIA_CONTROLLER
+ select VIDEO_V4L2_SUBDEV_API
+ select V4L2_FWNODE
+ help
+ CSI2 Demux Controller driver. CSI2DC is a helper chip
+ that converts IDI interface byte stream to a parallel pixel stream.
+ It supports various RAW formats as input.
+
+ To compile this driver as a module, choose M here: the
+ module will be called microchip-csi2dc.
diff --git a/drivers/media/platform/atmel/Makefile b/drivers/media/platform/atmel/Makefile
index 46d264ab7948..39f0a7eba702 100644
--- a/drivers/media/platform/atmel/Makefile
+++ b/drivers/media/platform/atmel/Makefile
@@ -6,3 +6,4 @@ obj-$(CONFIG_VIDEO_ATMEL_ISI) += atmel-isi.o
obj-$(CONFIG_VIDEO_ATMEL_ISC_BASE) += atmel-isc-base.o
obj-$(CONFIG_VIDEO_ATMEL_ISC) += atmel-isc.o
obj-$(CONFIG_VIDEO_ATMEL_XISC) += atmel-xisc.o
+obj-$(CONFIG_VIDEO_MICROCHIP_CSI2DC) += microchip-csi2dc.o
diff --git a/drivers/media/platform/atmel/microchip-csi2dc.c b/drivers/media/platform/atmel/microchip-csi2dc.c
new file mode 100644
index 000000000000..6bc549c28e05
--- /dev/null
+++ b/drivers/media/platform/atmel/microchip-csi2dc.c
@@ -0,0 +1,806 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Microchip CSI2 Demux Controller (CSI2DC) driver
+ *
+ * Copyright (C) 2018 Microchip Technology, Inc.
+ *
+ * Author: Eugen Hristev <eugen.hristev@microchip.com>
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/videodev2.h>
+
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-subdev.h>
+
+/* Global configuration register */
+#define CSI2DC_GCFG 0x0
+
+/* MIPI sensor pixel clock is free running */
+#define CSI2DC_GCFG_MIPIFRN BIT(0)
+/* GPIO parallel interface selection */
+#define CSI2DC_GCFG_GPIOSEL BIT(1)
+/* Output waveform inter-line minimum delay */
+#define CSI2DC_GCFG_HLC(v) ((v) << 4)
+#define CSI2DC_GCFG_HLC_MASK GENMASK(7, 4)
+/* SAMA7G5 requires a HLC delay of 15 */
+#define SAMA7G5_HLC (15)
+
+/* Global control register */
+#define CSI2DC_GCTLR 0x04
+#define CSI2DC_GCTLR_SWRST BIT(0)
+
+/* Global status register */
+#define CSI2DC_GS 0x08
+
+/* SSP interrupt status register */
+#define CSI2DC_SSPIS 0x28
+/* Pipe update register */
+#define CSI2DC_PU 0xc0
+/* Video pipe attributes update */
+#define CSI2DC_PU_VP BIT(0)
+
+/* Pipe update status register */
+#define CSI2DC_PUS 0xc4
+
+/* Video pipeline Interrupt Status Register */
+#define CSI2DC_VPISR 0xf4
+
+/* Video pipeline enable register */
+#define CSI2DC_VPE 0xf8
+#define CSI2DC_VPE_ENABLE BIT(0)
+
+/* Video pipeline configuration register */
+#define CSI2DC_VPCFG 0xfc
+/* Data type */
+#define CSI2DC_VPCFG_DT(v) ((v) << 0)
+#define CSI2DC_VPCFG_DT_MASK GENMASK(5, 0)
+/* Virtual channel identifier */
+#define CSI2DC_VPCFG_VC(v) ((v) << 6)
+#define CSI2DC_VPCFG_VC_MASK GENMASK(7, 6)
+/* Decompression enable */
+#define CSI2DC_VPCFG_DE BIT(8)
+/* Decoder mode */
+#define CSI2DC_VPCFG_DM(v) ((v) << 9)
+#define CSI2DC_VPCFG_DM_DECODER8TO12 0
+/* Decoder predictor 2 selection */
+#define CSI2DC_VPCFG_DP2 BIT(12)
+/* Recommended memory storage */
+#define CSI2DC_VPCFG_RMS BIT(13)
+/* Post adjustment */
+#define CSI2DC_VPCFG_PA BIT(14)
+
+/* Video pipeline column register */
+#define CSI2DC_VPCOL 0x100
+/* Column number */
+#define CSI2DC_VPCOL_COL(v) ((v) << 0)
+#define CSI2DC_VPCOL_COL_MASK GENMASK(15, 0)
+
+/* Video pipeline row register */
+#define CSI2DC_VPROW 0x104
+/* Row number */
+#define CSI2DC_VPROW_ROW(v) ((v) << 0)
+#define CSI2DC_VPROW_ROW_MASK GENMASK(15, 0)
+
+/* Version register */
+#define CSI2DC_VERSION 0x1fc
+
+/* register read/write helpers */
+#define csi2dc_readl(st, reg) readl_relaxed((st)->base + (reg))
+#define csi2dc_writel(st, reg, val) writel_relaxed((val), \
+ (st)->base + (reg))
+
+/* supported RAW data types */
+#define CSI2DC_DT_RAW6 0x28
+#define CSI2DC_DT_RAW7 0x29
+#define CSI2DC_DT_RAW8 0x2a
+#define CSI2DC_DT_RAW10 0x2b
+#define CSI2DC_DT_RAW12 0x2c
+#define CSI2DC_DT_RAW14 0x2d
+/* YUV data types */
+#define CSI2DC_DT_YUV422_8B 0x1e
+
+/*
+ * struct csi2dc_format - CSI2DC format type struct
+ * @mbus_code: Media bus code for the format
+ * @dt: Data type constant for this format
+ */
+struct csi2dc_format {
+ u32 mbus_code;
+ u32 dt;
+};
+
+static const struct csi2dc_format csi2dc_formats[] = {
+ {
+ .mbus_code = MEDIA_BUS_FMT_SRGGB8_1X8,
+ .dt = CSI2DC_DT_RAW8,
+ }, {
+ .mbus_code = MEDIA_BUS_FMT_SBGGR8_1X8,
+ .dt = CSI2DC_DT_RAW8,
+ }, {
+ .mbus_code = MEDIA_BUS_FMT_SGRBG8_1X8,
+ .dt = CSI2DC_DT_RAW8,
+ }, {
+ .mbus_code = MEDIA_BUS_FMT_SGBRG8_1X8,
+ .dt = CSI2DC_DT_RAW8,
+ }, {
+ .mbus_code = MEDIA_BUS_FMT_SRGGB10_1X10,
+ .dt = CSI2DC_DT_RAW10,
+ }, {
+ .mbus_code = MEDIA_BUS_FMT_SBGGR10_1X10,
+ .dt = CSI2DC_DT_RAW10,
+ }, {
+ .mbus_code = MEDIA_BUS_FMT_SGRBG10_1X10,
+ .dt = CSI2DC_DT_RAW10,
+ }, {
+ .mbus_code = MEDIA_BUS_FMT_SGBRG10_1X10,
+ .dt = CSI2DC_DT_RAW10,
+ }, {
+ .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
+ .dt = CSI2DC_DT_YUV422_8B,
+ },
+};
+
+enum mipi_csi_pads {
+ CSI2DC_PAD_SINK = 0,
+ CSI2DC_PAD_SOURCE = 1,
+ CSI2DC_PADS_NUM = 2,
+};
+
+/*
+ * struct csi2dc_device - CSI2DC device driver data/config struct
+ * @base: Register map base address
+ * @csi2dc_sd: v4l2 subdevice for the csi2dc device
+ * This is the subdevice that the csi2dc device itself
+ * registers in v4l2 subsystem
+ * @dev: struct device for this csi2dc device
+ * @pclk: Peripheral clock reference
+ * Input clock that clocks the hardware block internal
+ * logic
+ * @scck: Sensor Controller clock reference
+ * Input clock that is used to generate the pixel clock
+ * @format: Current saved format used in g/s fmt
+ * @cur_fmt: Current state format
+ * @try_fmt: Try format that is being tried
+ * @pads: Media entity pads for the csi2dc subdevice
+ * @clk_gated: Whether the clock is gated or free running
+ * @video_pipe: Whether video pipeline is configured
+ * @parallel_mode: The underlying subdevice is connected on a parallel bus
+ * @vc: Current set virtual channel
+ * @notifier: Async notifier that is used to bound the underlying
+ * subdevice to the csi2dc subdevice
+ * @input_sd: Reference to the underlying subdevice bound to the
+ * csi2dc subdevice
+ * @remote_pad: Pad number of the underlying subdevice that is linked
+ * to the csi2dc subdevice sink pad.
+ */
+struct csi2dc_device {
+ void __iomem *base;
+ struct v4l2_subdev csi2dc_sd;
+ struct device *dev;
+ struct clk *pclk;
+ struct clk *scck;
+
+ struct v4l2_mbus_framefmt format;
+
+ const struct csi2dc_format *cur_fmt;
+ const struct csi2dc_format *try_fmt;
+
+ struct media_pad pads[CSI2DC_PADS_NUM];
+
+ bool clk_gated;
+ bool video_pipe;
+ bool parallel_mode;
+ u32 vc;
+
+ struct v4l2_async_notifier notifier;
+
+ struct v4l2_subdev *input_sd;
+
+ u32 remote_pad;
+};
+
+static inline struct csi2dc_device *
+csi2dc_sd_to_csi2dc_device(struct v4l2_subdev *csi2dc_sd)
+{
+ return container_of(csi2dc_sd, struct csi2dc_device, csi2dc_sd);
+}
+
+static int csi2dc_enum_mbus_code(struct v4l2_subdev *csi2dc_sd,
+ struct v4l2_subdev_state *sd_state,
+ struct v4l2_subdev_mbus_code_enum *code)
+{
+ if (code->index >= ARRAY_SIZE(csi2dc_formats))
+ return -EINVAL;
+
+ code->code = csi2dc_formats[code->index].mbus_code;
+
+ return 0;
+}
+
+static int csi2dc_get_fmt(struct v4l2_subdev *csi2dc_sd,
+ struct v4l2_subdev_state *sd_state,
+ struct v4l2_subdev_format *format)
+{
+ struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
+ struct v4l2_mbus_framefmt *v4l2_try_fmt;
+
+ if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
+ v4l2_try_fmt = v4l2_subdev_get_try_format(csi2dc_sd, sd_state,
+ format->pad);
+ format->format = *v4l2_try_fmt;
+
+ return 0;
+ }
+
+ format->format = csi2dc->format;
+
+ return 0;
+}
+
+static int csi2dc_set_fmt(struct v4l2_subdev *csi2dc_sd,
+ struct v4l2_subdev_state *sd_state,
+ struct v4l2_subdev_format *req_fmt)
+{
+ struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
+ const struct csi2dc_format *fmt, *try_fmt = NULL;
+ struct v4l2_mbus_framefmt *v4l2_try_fmt;
+ unsigned int i;
+
+ /*
+ * Setting the source pad is disabled.
+ * The same format is being propagated from the sink to source.
+ */
+ if (req_fmt->pad == CSI2DC_PAD_SOURCE)
+ return -EINVAL;
+
+ for (i = 0; i < ARRAY_SIZE(csi2dc_formats); i++) {
+ fmt = &csi2dc_formats[i];
+ if (req_fmt->format.code == fmt->mbus_code)
+ try_fmt = fmt;
+ fmt++;
+ }
+
+ /* in case we could not find the desired format, default to something */
+ if (!try_fmt) {
+ try_fmt = &csi2dc_formats[0];
+
+ dev_dbg(csi2dc->dev,
+ "CSI2DC unsupported format 0x%x, defaulting to 0x%x\n",
+ req_fmt->format.code, csi2dc_formats[0].mbus_code);
+ }
+
+ req_fmt->format.code = try_fmt->mbus_code;
+ req_fmt->format.colorspace = V4L2_COLORSPACE_SRGB;
+ req_fmt->format.field = V4L2_FIELD_NONE;
+
+ if (req_fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
+ v4l2_try_fmt = v4l2_subdev_get_try_format(csi2dc_sd, sd_state,
+ req_fmt->pad);
+ *v4l2_try_fmt = req_fmt->format;
+ /* Trying on the sink pad makes the source pad change too */
+ v4l2_try_fmt = v4l2_subdev_get_try_format(csi2dc_sd,
+ sd_state,
+ CSI2DC_PAD_SOURCE);
+ *v4l2_try_fmt = req_fmt->format;
+
+ /* if we are just trying, we are done */
+ return 0;
+ }
+
+ /* save the format for later requests */
+ csi2dc->format = req_fmt->format;
+
+ /* update config */
+ csi2dc->cur_fmt = try_fmt;
+
+ dev_dbg(csi2dc->dev, "new format set: 0x%x @%dx%d\n",
+ csi2dc->format.code, csi2dc->format.width,
+ csi2dc->format.height);
+
+ return 0;
+}
+
+static int csi2dc_power(struct csi2dc_device *csi2dc, int on)
+{
+ int ret = 0;
+
+ if (on) {
+ ret = clk_prepare_enable(csi2dc->pclk);
+ if (ret) {
+ dev_err(csi2dc->dev, "failed to enable pclk:%d\n", ret);
+ return ret;
+ }
+
+ ret = clk_prepare_enable(csi2dc->scck);
+ if (ret) {
+ dev_err(csi2dc->dev, "failed to enable scck:%d\n", ret);
+ clk_disable_unprepare(csi2dc->pclk);
+ return ret;
+ }
+
+ /* if powering up, deassert reset line */
+ csi2dc_writel(csi2dc, CSI2DC_GCTLR, CSI2DC_GCTLR_SWRST);
+ } else {
+ /* if powering down, assert reset line */
+ csi2dc_writel(csi2dc, CSI2DC_GCTLR, 0);
+
+ clk_disable_unprepare(csi2dc->scck);
+ clk_disable_unprepare(csi2dc->pclk);
+ }
+
+ return ret;
+}
+
+static int csi2dc_get_mbus_config(struct csi2dc_device *csi2dc)
+{
+ struct v4l2_mbus_config mbus_config = { 0 };
+ int ret;
+
+ ret = v4l2_subdev_call(csi2dc->input_sd, pad, get_mbus_config,
+ csi2dc->remote_pad, &mbus_config);
+ if (ret == -ENOIOCTLCMD) {
+ dev_dbg(csi2dc->dev,
+ "no remote mbus configuration available\n");
+ goto csi2dc_get_mbus_config_defaults;
+ }
+
+ if (ret) {
+ dev_err(csi2dc->dev,
+ "failed to get remote mbus configuration\n");
+ goto csi2dc_get_mbus_config_defaults;
+ }
+
+ if (mbus_config.flags & V4L2_MBUS_CSI2_CHANNEL_0)
+ csi2dc->vc = 0;
+ else if (mbus_config.flags & V4L2_MBUS_CSI2_CHANNEL_1)
+ csi2dc->vc = 1;
+ else if (mbus_config.flags & V4L2_MBUS_CSI2_CHANNEL_2)
+ csi2dc->vc = 2;
+ else if (mbus_config.flags & V4L2_MBUS_CSI2_CHANNEL_3)
+ csi2dc->vc = 3;
+
+ dev_dbg(csi2dc->dev, "subdev sending on channel %d\n", csi2dc->vc);
+
+ csi2dc->clk_gated = mbus_config.flags &
+ V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK;
+
+ dev_dbg(csi2dc->dev, "mbus_config: %s clock\n",
+ csi2dc->clk_gated ? "gated" : "free running");
+
+ return 0;
+
+csi2dc_get_mbus_config_defaults:
+ csi2dc->vc = 0; /* Virtual ID 0 by default */
+
+ return 0;
+}
+
+static void csi2dc_vp_update(struct csi2dc_device *csi2dc)
+{
+ u32 vp, gcfg;
+
+ if (!csi2dc->video_pipe) {
+ dev_err(csi2dc->dev, "video pipeline unavailable\n");
+ return;
+ }
+
+ if (csi2dc->parallel_mode) {
+ /* In parallel mode, GPIO parallel interface must be selected */
+ gcfg = csi2dc_readl(csi2dc, CSI2DC_GCFG);
+ gcfg |= CSI2DC_GCFG_GPIOSEL;
+ csi2dc_writel(csi2dc, CSI2DC_GCFG, gcfg);
+ return;
+ }
+
+ /* serial video pipeline */
+
+ csi2dc_writel(csi2dc, CSI2DC_GCFG,
+ (SAMA7G5_HLC & CSI2DC_GCFG_HLC_MASK) |
+ (csi2dc->clk_gated ? 0 : CSI2DC_GCFG_MIPIFRN));
+
+ vp = CSI2DC_VPCFG_DT(csi2dc->cur_fmt->dt) & CSI2DC_VPCFG_DT_MASK;
+ vp |= CSI2DC_VPCFG_VC(csi2dc->vc) & CSI2DC_VPCFG_VC_MASK;
+ vp &= ~CSI2DC_VPCFG_DE;
+ vp |= CSI2DC_VPCFG_DM(CSI2DC_VPCFG_DM_DECODER8TO12);
+ vp &= ~CSI2DC_VPCFG_DP2;
+ vp &= ~CSI2DC_VPCFG_RMS;
+ vp |= CSI2DC_VPCFG_PA;
+
+ csi2dc_writel(csi2dc, CSI2DC_VPCFG, vp);
+ csi2dc_writel(csi2dc, CSI2DC_VPE, CSI2DC_VPE_ENABLE);
+ csi2dc_writel(csi2dc, CSI2DC_PU, CSI2DC_PU_VP);
+}
+
+static int csi2dc_s_stream(struct v4l2_subdev *csi2dc_sd, int enable)
+{
+ struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
+ int ret;
+
+ if (enable) {
+ ret = pm_runtime_resume_and_get(csi2dc->dev);
+ if (ret < 0)
+ return ret;
+
+ csi2dc_get_mbus_config(csi2dc);
+
+ csi2dc_vp_update(csi2dc);
+
+ return v4l2_subdev_call(csi2dc->input_sd, video, s_stream,
+ true);
+ }
+
+ dev_dbg(csi2dc->dev,
+ "Last frame received: VPCOLR = %u, VPROWR= %u, VPISR = %x\n",
+ csi2dc_readl(csi2dc, CSI2DC_VPCOL),
+ csi2dc_readl(csi2dc, CSI2DC_VPROW),
+ csi2dc_readl(csi2dc, CSI2DC_VPISR));
+
+ /* stop streaming scenario */
+ ret = v4l2_subdev_call(csi2dc->input_sd, video, s_stream, false);
+
+ pm_runtime_put_sync(csi2dc->dev);
+
+ return ret;
+}
+
+static int csi2dc_init_cfg(struct v4l2_subdev *csi2dc_sd,
+ struct v4l2_subdev_state *sd_state)
+{
+ struct v4l2_mbus_framefmt *v4l2_try_fmt =
+ v4l2_subdev_get_try_format(csi2dc_sd, sd_state, 0);
+
+ v4l2_try_fmt->height = 480;
+ v4l2_try_fmt->width = 640;
+ v4l2_try_fmt->code = csi2dc_formats[0].mbus_code;
+ v4l2_try_fmt->colorspace = V4L2_COLORSPACE_SRGB;
+ v4l2_try_fmt->field = V4L2_FIELD_NONE;
+ v4l2_try_fmt->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
+ v4l2_try_fmt->quantization = V4L2_QUANTIZATION_DEFAULT;
+ v4l2_try_fmt->xfer_func = V4L2_XFER_FUNC_DEFAULT;
+
+ return 0;
+}
+
+static const struct v4l2_subdev_pad_ops csi2dc_pad_ops = {
+ .enum_mbus_code = csi2dc_enum_mbus_code,
+ .set_fmt = csi2dc_set_fmt,
+ .get_fmt = csi2dc_get_fmt,
+ .init_cfg = csi2dc_init_cfg,
+};
+
+static const struct v4l2_subdev_video_ops csi2dc_video_ops = {
+ .s_stream = csi2dc_s_stream,
+};
+
+static const struct v4l2_subdev_ops csi2dc_subdev_ops = {
+ .pad = &csi2dc_pad_ops,
+ .video = &csi2dc_video_ops,
+};
+
+static int csi2dc_async_bound(struct v4l2_async_notifier *notifier,
+ struct v4l2_subdev *subdev,
+ struct v4l2_async_subdev *asd)
+{
+ struct csi2dc_device *csi2dc = container_of(notifier,
+ struct csi2dc_device, notifier);
+ int pad;
+ int ret;
+
+ csi2dc->input_sd = subdev;
+
+ pad = media_entity_get_fwnode_pad(&subdev->entity, asd->match.fwnode,
+ MEDIA_PAD_FL_SOURCE);
+ if (pad < 0) {
+ dev_err(csi2dc->dev, "Failed to find pad for %s\n",
+ subdev->name);
+ return pad;
+ }
+
+ csi2dc->remote_pad = pad;
+
+ ret = media_create_pad_link(&csi2dc->input_sd->entity,
+ csi2dc->remote_pad,
+ &csi2dc->csi2dc_sd.entity, 0,
+ MEDIA_LNK_FL_ENABLED);
+ if (ret) {
+ dev_err(csi2dc->dev,
+ "Failed to create pad link: %s to %s\n",
+ csi2dc->input_sd->entity.name,
+ csi2dc->csi2dc_sd.entity.name);
+ return ret;
+ }
+
+ dev_dbg(csi2dc->dev, "link with %s pad: %d\n",
+ csi2dc->input_sd->name, csi2dc->remote_pad);
+
+ return ret;
+}
+
+static const struct v4l2_async_notifier_operations csi2dc_async_ops = {
+ .bound = csi2dc_async_bound,
+};
+
+static int csi2dc_prepare_notifier(struct csi2dc_device *csi2dc,
+ struct fwnode_handle *input_fwnode)
+{
+ struct v4l2_async_subdev *asd;
+ int ret = 0;
+
+ v4l2_async_nf_init(&csi2dc->notifier);
+
+ asd = v4l2_async_nf_add_fwnode_remote(&csi2dc->notifier,
+ input_fwnode,
+ struct v4l2_async_subdev);
+
+ fwnode_handle_put(input_fwnode);
+
+ if (IS_ERR(asd)) {
+ ret = PTR_ERR(asd);
+ dev_err(csi2dc->dev,
+ "failed to add async notifier for node %pOF: %d\n",
+ to_of_node(input_fwnode), ret);
+ v4l2_async_nf_cleanup(&csi2dc->notifier);
+ return ret;
+ }
+
+ csi2dc->notifier.ops = &csi2dc_async_ops;
+
+ ret = v4l2_async_subdev_nf_register(&csi2dc->csi2dc_sd,
+ &csi2dc->notifier);
+ if (ret) {
+ dev_err(csi2dc->dev, "fail to register async notifier: %d\n",
+ ret);
+ v4l2_async_nf_cleanup(&csi2dc->notifier);
+ }
+
+ return ret;
+}
+
+static int csi2dc_of_parse(struct csi2dc_device *csi2dc,
+ struct device_node *of_node)
+{
+ struct fwnode_handle *input_fwnode, *output_fwnode;
+ struct v4l2_fwnode_endpoint input_endpoint = { 0 },
+ output_endpoint = { 0 };
+ int ret;
+
+ input_fwnode = fwnode_graph_get_next_endpoint(of_fwnode_handle(of_node),
+ NULL);
+ if (!input_fwnode) {
+ dev_err(csi2dc->dev,
+ "missing port node at %pOF, input node is mandatory.\n",
+ of_node);
+ return -EINVAL;
+ }
+
+ ret = v4l2_fwnode_endpoint_parse(input_fwnode, &input_endpoint);
+ if (ret) {
+ dev_err(csi2dc->dev, "endpoint not defined at %pOF\n", of_node);
+ goto csi2dc_of_parse_err;
+ }
+
+ if (input_endpoint.bus_type == V4L2_MBUS_PARALLEL ||
+ input_endpoint.bus_type == V4L2_MBUS_BT656) {
+ csi2dc->parallel_mode = true;
+ dev_dbg(csi2dc->dev,
+ "subdevice connected on parallel interface\n");
+ }
+
+ if (input_endpoint.bus_type == V4L2_MBUS_CSI2_DPHY) {
+ csi2dc->clk_gated = input_endpoint.bus.mipi_csi2.flags &
+ V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK;
+ dev_dbg(csi2dc->dev,
+ "subdevice connected on serial interface\n");
+ dev_dbg(csi2dc->dev, "DT: %s clock\n",
+ csi2dc->clk_gated ? "gated" : "free running");
+ }
+
+ output_fwnode = fwnode_graph_get_next_endpoint
+ (of_fwnode_handle(of_node), input_fwnode);
+
+ if (output_fwnode)
+ ret = v4l2_fwnode_endpoint_parse(output_fwnode,
+ &output_endpoint);
+
+ fwnode_handle_put(output_fwnode);
+
+ if (!output_fwnode || ret) {
+ dev_info(csi2dc->dev,
+ "missing output node at %pOF, data pipe available only.\n",
+ of_node);
+ } else {
+ if (output_endpoint.bus_type != V4L2_MBUS_PARALLEL &&
+ output_endpoint.bus_type != V4L2_MBUS_BT656) {
+ dev_err(csi2dc->dev,
+ "output port must be parallel/bt656.\n");
+ ret = -EINVAL;
+ goto csi2dc_of_parse_err;
+ }
+
+ csi2dc->video_pipe = true;
+
+ dev_dbg(csi2dc->dev,
+ "block %pOF [%d.%d]->[%d.%d] video pipeline\n",
+ of_node, input_endpoint.base.port,
+ input_endpoint.base.id, output_endpoint.base.port,
+ output_endpoint.base.id);
+ }
+
+ /* prepare async notifier for subdevice completion */
+ return csi2dc_prepare_notifier(csi2dc, input_fwnode);
+
+csi2dc_of_parse_err:
+ fwnode_handle_put(input_fwnode);
+ return ret;
+}
+
+static void csi2dc_default_format(struct csi2dc_device *csi2dc)
+{
+ csi2dc->cur_fmt = &csi2dc_formats[0];
+
+ csi2dc->format.height = 480;
+ csi2dc->format.width = 640;
+ csi2dc->format.code = csi2dc_formats[0].mbus_code;
+ csi2dc->format.colorspace = V4L2_COLORSPACE_SRGB;
+ csi2dc->format.field = V4L2_FIELD_NONE;
+ csi2dc->format.ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
+ csi2dc->format.quantization = V4L2_QUANTIZATION_DEFAULT;
+ csi2dc->format.xfer_func = V4L2_XFER_FUNC_DEFAULT;
+}
+
+static int csi2dc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct csi2dc_device *csi2dc;
+ int ret = 0;
+ u32 ver;
+
+ csi2dc = devm_kzalloc(dev, sizeof(*csi2dc), GFP_KERNEL);
+ if (!csi2dc)
+ return -ENOMEM;
+
+ csi2dc->dev = dev;
+
+ csi2dc->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(csi2dc->base)) {
+ dev_err(dev, "base address not set\n");
+ return PTR_ERR(csi2dc->base);
+ }
+
+ csi2dc->pclk = devm_clk_get(dev, "pclk");
+ if (IS_ERR(csi2dc->pclk)) {
+ ret = PTR_ERR(csi2dc->pclk);
+ dev_err(dev, "failed to get pclk: %d\n", ret);
+ return ret;
+ }
+
+ csi2dc->scck = devm_clk_get(dev, "scck");
+ if (IS_ERR(csi2dc->scck)) {
+ ret = PTR_ERR(csi2dc->scck);
+ dev_err(dev, "failed to get scck: %d\n", ret);
+ return ret;
+ }
+
+ v4l2_subdev_init(&csi2dc->csi2dc_sd, &csi2dc_subdev_ops);
+
+ csi2dc->csi2dc_sd.owner = THIS_MODULE;
+ csi2dc->csi2dc_sd.dev = dev;
+ snprintf(csi2dc->csi2dc_sd.name, sizeof(csi2dc->csi2dc_sd.name),
+ "csi2dc");
+
+ csi2dc->csi2dc_sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+ csi2dc->csi2dc_sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
+
+ platform_set_drvdata(pdev, csi2dc);
+
+ ret = csi2dc_of_parse(csi2dc, dev->of_node);
+ if (ret)
+ goto csi2dc_probe_cleanup_entity;
+
+ csi2dc->pads[CSI2DC_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
+ if (csi2dc->video_pipe)
+ csi2dc->pads[CSI2DC_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
+
+ ret = media_entity_pads_init(&csi2dc->csi2dc_sd.entity,
+ csi2dc->video_pipe ? CSI2DC_PADS_NUM : 1,
+ csi2dc->pads);
+ if (ret < 0) {
+ dev_err(dev, "media entity init failed\n");
+ goto csi2dc_probe_cleanup_notifier;
+ }
+
+ csi2dc_default_format(csi2dc);
+
+ /* turn power on to validate capabilities */
+ ret = csi2dc_power(csi2dc, true);
+ if (ret < 0)
+ goto csi2dc_probe_cleanup_notifier;
+
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+ ver = csi2dc_readl(csi2dc, CSI2DC_VERSION);
+
+ /*
+ * we must register the subdev after PM runtime has been requested,
+ * otherwise we might bound immediately and request pm_runtime_resume
+ * before runtime_enable.
+ */
+ ret = v4l2_async_register_subdev(&csi2dc->csi2dc_sd);
+ if (ret) {
+ dev_err(csi2dc->dev, "failed to register the subdevice\n");
+ goto csi2dc_probe_cleanup_notifier;
+ }
+
+ dev_info(dev, "Microchip CSI2DC version %x\n", ver);
+
+ return 0;
+
+csi2dc_probe_cleanup_notifier:
+ v4l2_async_nf_cleanup(&csi2dc->notifier);
+csi2dc_probe_cleanup_entity:
+ media_entity_cleanup(&csi2dc->csi2dc_sd.entity);
+
+ return ret;
+}
+
+static int csi2dc_remove(struct platform_device *pdev)
+{
+ struct csi2dc_device *csi2dc = platform_get_drvdata(pdev);
+
+ pm_runtime_disable(&pdev->dev);
+
+ v4l2_async_unregister_subdev(&csi2dc->csi2dc_sd);
+ v4l2_async_nf_unregister(&csi2dc->notifier);
+ v4l2_async_nf_cleanup(&csi2dc->notifier);
+ media_entity_cleanup(&csi2dc->csi2dc_sd.entity);
+
+ return 0;
+}
+
+static int __maybe_unused csi2dc_runtime_suspend(struct device *dev)
+{
+ struct csi2dc_device *csi2dc = dev_get_drvdata(dev);
+
+ return csi2dc_power(csi2dc, false);
+}
+
+static int __maybe_unused csi2dc_runtime_resume(struct device *dev)
+{
+ struct csi2dc_device *csi2dc = dev_get_drvdata(dev);
+
+ return csi2dc_power(csi2dc, true);
+}
+
+static const struct dev_pm_ops csi2dc_dev_pm_ops = {
+ SET_RUNTIME_PM_OPS(csi2dc_runtime_suspend, csi2dc_runtime_resume, NULL)
+};
+
+static const struct of_device_id csi2dc_of_match[] = {
+ { .compatible = "microchip,sama7g5-csi2dc" },
+ { }
+};
+
+MODULE_DEVICE_TABLE(of, csi2dc_of_match);
+
+static struct platform_driver csi2dc_driver = {
+ .probe = csi2dc_probe,
+ .remove = csi2dc_remove,
+ .driver = {
+ .name = "microchip-csi2dc",
+ .pm = &csi2dc_dev_pm_ops,
+ .of_match_table = of_match_ptr(csi2dc_of_match),
+ },
+};
+
+module_platform_driver(csi2dc_driver);
+
+MODULE_AUTHOR("Eugen Hristev <eugen.hristev@microchip.com>");
+MODULE_DESCRIPTION("Microchip CSI2 Demux Controller driver");
+MODULE_LICENSE("GPL v2");
--
2.25.1