[PATCH v9 2/3] media: imx: add a driver for i.MX8MQ mipi csi rx phy and controller

Martin Kepplinger
2021-07-26T08:21:45Z

Add a driver to support the i.MX8MQ MIPI CSI receiver. The hardware side
is based on
https://source.codeaurora.org/external/imx/linux-imx/tree/drivers/media/platform/imx8/mxc-mipi-csi2_yav.c?h=imx_5.4.70_2.3.0

It's built as part of VIDEO_IMX7_CSI because that's documented to support
i.MX8M platforms. This driver adds i.MX8MQ support where currently only the
i.MX8MM platform has been supported.

Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
drivers/staging/media/imx/Makefile | 1 +
drivers/staging/media/imx/imx8mq-mipi-csi2.c | 976 +++++++++++++++++++
2 files changed, 977 insertions(+)
create mode 100644 drivers/staging/media/imx/imx8mq-mipi-csi2.c

diff --git a/drivers/staging/media/imx/Makefile b/drivers/staging/media/imx/Makefile
index 6ac33275cc97..19c2fc54d424 100644
--- a/drivers/staging/media/imx/Makefile
+++ b/drivers/staging/media/imx/Makefile
@@ -16,3 +16,4 @@ obj-$(CONFIG_VIDEO_IMX_CSI) += imx6-mipi-csi2.o

obj-$(CONFIG_VIDEO_IMX7_CSI) += imx7-media-csi.o
obj-$(CONFIG_VIDEO_IMX7_CSI) += imx7-mipi-csis.o
+obj-$(CONFIG_VIDEO_IMX7_CSI) += imx8mq-mipi-csi2.o
diff --git a/drivers/staging/media/imx/imx8mq-mipi-csi2.c b/drivers/staging/media/imx/imx8mq-mipi-csi2.c
new file mode 100644
index 000000000000..c4f4fe0c533b
--- /dev/null
+++ b/drivers/staging/media/imx/imx8mq-mipi-csi2.c
@@ -0,0 +1,976 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * NXP i.MX8MQ SoC series MIPI-CSI2 receiver driver
+ *
+ * Copyright (C) 2021 Purism SPC
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/interconnect.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/reset.h>
+#include <linux/spinlock.h>
+
+#include <media/v4l2-common.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-mc.h>
+#include <media/v4l2-subdev.h>
+
+#define MIPI_CSI2_DRIVER_NAME "imx8mq-mipi-csi2"
+#define MIPI_CSI2_SUBDEV_NAME MIPI_CSI2_DRIVER_NAME
+
+#define MIPI_CSI2_PAD_SINK 0
+#define MIPI_CSI2_PAD_SOURCE 1
+#define MIPI_CSI2_PADS_NUM 2
+
+#define MIPI_CSI2_DEF_PIX_WIDTH 640
+#define MIPI_CSI2_DEF_PIX_HEIGHT 480
+
+/* Register map definition */
+
+/* i.MX8MQ CSI-2 controller CSR */
+#define CSI2RX_CFG_NUM_LANES 0x100
+#define CSI2RX_CFG_DISABLE_DATA_LANES 0x104
+#define CSI2RX_BIT_ERR 0x108
+#define CSI2RX_IRQ_STATUS 0x10c
+#define CSI2RX_IRQ_MASK 0x110
+#define CSI2RX_IRQ_MASK_ALL 0x1ff
+#define CSI2RX_IRQ_MASK_ULPS_STATUS_CHANGE 0x8
+#define CSI2RX_ULPS_STATUS 0x114
+#define CSI2RX_PPI_ERRSOT_HS 0x118
+#define CSI2RX_PPI_ERRSOTSYNC_HS 0x11c
+#define CSI2RX_PPI_ERRESC 0x120
+#define CSI2RX_PPI_ERRSYNCESC 0x124
+#define CSI2RX_PPI_ERRCONTROL 0x128
+#define CSI2RX_CFG_DISABLE_PAYLOAD_0 0x12c
+#define CSI2RX_CFG_VID_P_FIFO_SEND_LEVEL 0x188
+#define CSI2RX_CFG_DISABLE_PAYLOAD_1 0x130
+
+enum {
+ ST_POWERED = 1,
+ ST_STREAMING = 2,
+ ST_SUSPENDED = 4,
+};
+
+enum imx8mq_mipi_csi_clk {
+ CSI2_CLK_CORE,
+ CSI2_CLK_ESC,
+ CSI2_CLK_UI,
+ CSI2_NUM_CLKS,
+};
+
+static const char * const imx8mq_mipi_csi_clk_id[CSI2_NUM_CLKS] = {
+ [CSI2_CLK_CORE] = "core",
+ [CSI2_CLK_ESC] = "esc",
+ [CSI2_CLK_UI] = "ui",
+};
+
+#define CSI2_NUM_CLKS ARRAY_SIZE(imx8mq_mipi_csi_clk_id)
+
+#define GPR_CSI2_1_RX_ENABLE BIT(13)
+#define GPR_CSI2_1_VID_INTFC_ENB BIT(12)
+#define GPR_CSI2_1_HSEL BIT(10)
+#define GPR_CSI2_1_CONT_CLK_MODE BIT(8)
+#define GPR_CSI2_1_S_PRG_RXHS_SETTLE(x) (((x) & 0x3f) << 2)
+
+/*
+ * The send level configures the number of entries that must accumulate in
+ * the Pixel FIFO before the data will be transferred to the video output.
+ * See https://community.nxp.com/t5/i-MX-Processors/IMX8M-MIPI-CSI-Host-Controller-send-level/m-p/864005/highlight/true#M131704
+ */
+#define CSI2RX_SEND_LEVEL 64
+
+struct csi_state {
+ struct device *dev;
+ void __iomem *regs;
+ struct clk_bulk_data clks[CSI2_NUM_CLKS];
+ struct reset_control *rst;
+ struct regulator *mipi_phy_regulator;
+
+ struct v4l2_subdev sd;
+ struct media_pad pads[MIPI_CSI2_PADS_NUM];
+ struct v4l2_async_notifier notifier;
+ struct v4l2_subdev *src_sd;
+
+ struct v4l2_fwnode_bus_mipi_csi2 bus;
+
+ struct mutex lock; /* Protect csi2_fmt, format_mbus, state, hs_settle */
+ const struct csi2_pix_format *csi2_fmt;
+ struct v4l2_mbus_framefmt format_mbus[MIPI_CSI2_PADS_NUM];
+ u32 state;
+ u32 hs_settle;
+
+ struct regmap *phy_gpr;
+ u8 phy_gpr_reg;
+
+ struct icc_path *icc_path;
+ s32 icc_path_bw;
+};
+
+/* -----------------------------------------------------------------------------
+ * Format helpers
+ */
+
+struct csi2_pix_format {
+ u32 code;
+ u8 width;
+};
+
+static const struct csi2_pix_format imx8mq_mipi_csi_formats[] = {
+ /* RAW (Bayer and greyscale) formats. */
+ {
+ .code = MEDIA_BUS_FMT_SBGGR8_1X8,
+ .width = 8,
+ }, {
+ .code = MEDIA_BUS_FMT_SGBRG8_1X8,
+ .width = 8,
+ }, {
+ .code = MEDIA_BUS_FMT_SGRBG8_1X8,
+ .width = 8,
+ }, {
+ .code = MEDIA_BUS_FMT_SRGGB8_1X8,
+ .width = 8,
+ }, {
+ .code = MEDIA_BUS_FMT_Y8_1X8,
+ .width = 8,
+ }, {
+ .code = MEDIA_BUS_FMT_SBGGR10_1X10,
+ .width = 10,
+ }, {
+ .code = MEDIA_BUS_FMT_SGBRG10_1X10,
+ .width = 10,
+ }, {
+ .code = MEDIA_BUS_FMT_SGRBG10_1X10,
+ .width = 10,
+ }, {
+ .code = MEDIA_BUS_FMT_SRGGB10_1X10,
+ .width = 10,
+ }, {
+ .code = MEDIA_BUS_FMT_Y10_1X10,
+ .width = 10,
+ }, {
+ .code = MEDIA_BUS_FMT_SBGGR12_1X12,
+ .width = 12,
+ }, {
+ .code = MEDIA_BUS_FMT_SGBRG12_1X12,
+ .width = 12,
+ }, {
+ .code = MEDIA_BUS_FMT_SGRBG12_1X12,
+ .width = 12,
+ }, {
+ .code = MEDIA_BUS_FMT_SRGGB12_1X12,
+ .width = 12,
+ }, {
+ .code = MEDIA_BUS_FMT_Y12_1X12,
+ .width = 12,
+ }, {
+ .code = MEDIA_BUS_FMT_SBGGR14_1X14,
+ .width = 14,
+ }, {
+ .code = MEDIA_BUS_FMT_SGBRG14_1X14,
+ .width = 14,
+ }, {
+ .code = MEDIA_BUS_FMT_SGRBG14_1X14,
+ .width = 14,
+ }, {
+ .code = MEDIA_BUS_FMT_SRGGB14_1X14,
+ .width = 14,
+ }, {
+ /* YUV formats */
+ .code = MEDIA_BUS_FMT_YUYV8_2X8,
+ .width = 16,
+ }, {
+ .code = MEDIA_BUS_FMT_YUYV8_1X16,
+ .width = 16,
+ }
+};
+
+static const struct csi2_pix_format *find_csi2_format(u32 code)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(imx8mq_mipi_csi_formats); i++)
+ if (code == imx8mq_mipi_csi_formats[i].code)
+ return &imx8mq_mipi_csi_formats[i];
+ return NULL;
+}
+
+/* -----------------------------------------------------------------------------
+ * Hardware configuration
+ */
+
+static inline void imx8mq_mipi_csi_write(struct csi_state *state, u32 reg, u32 val)
+{
+ writel(val, state->regs + reg);
+}
+
+static int imx8mq_mipi_csi_sw_reset(struct csi_state *state)
+{
+ int ret;
+
+ /*
+ * these are most likely self-clearing reset bits. to make it
+ * more clear, the reset-imx7 driver should implement the
+ * .reset() operation.
+ */
+ ret = reset_control_assert(state->rst);
+ if (ret < 0) {
+ dev_err(state->dev, "Failed to assert resets: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void imx8mq_mipi_csi_system_enable(struct csi_state *state, int on)
+{
+ if (!on) {
+ imx8mq_mipi_csi_write(state, CSI2RX_CFG_DISABLE_DATA_LANES, 0xf);
+ return;
+ }
+
+ regmap_update_bits(state->phy_gpr,
+ state->phy_gpr_reg,
+ 0x3fff,
+ GPR_CSI2_1_RX_ENABLE |
+ GPR_CSI2_1_VID_INTFC_ENB |
+ GPR_CSI2_1_HSEL |
+ GPR_CSI2_1_CONT_CLK_MODE |
+ GPR_CSI2_1_S_PRG_RXHS_SETTLE(state->hs_settle));
+}
+
+static void imx8mq_mipi_csi_set_params(struct csi_state *state)
+{
+ int lanes = state->bus.num_data_lanes;
+
+ imx8mq_mipi_csi_write(state, CSI2RX_CFG_NUM_LANES, lanes - 1);
+ imx8mq_mipi_csi_write(state, CSI2RX_CFG_DISABLE_DATA_LANES,
+ (0xf << lanes) & 0xf);
+ imx8mq_mipi_csi_write(state, CSI2RX_IRQ_MASK, CSI2RX_IRQ_MASK_ALL);
+ imx8mq_mipi_csi_write(state, 0x180, 1);
+ /* vid_vc */
+ imx8mq_mipi_csi_write(state, 0x184, 1);
+ imx8mq_mipi_csi_write(state, 0x188, CSI2RX_SEND_LEVEL);
+}
+
+static int imx8mq_mipi_csi_clk_enable(struct csi_state *state)
+{
+ return clk_bulk_prepare_enable(CSI2_NUM_CLKS, state->clks);
+}
+
+static void imx8mq_mipi_csi_clk_disable(struct csi_state *state)
+{
+ clk_bulk_disable_unprepare(CSI2_NUM_CLKS, state->clks);
+}
+
+static int imx8mq_mipi_csi_clk_get(struct csi_state *state)
+{
+ unsigned int i;
+
+ for (i = 0; i < CSI2_NUM_CLKS; i++)
+ state->clks[i].id = imx8mq_mipi_csi_clk_id[i];
+
+ return devm_clk_bulk_get(state->dev, CSI2_NUM_CLKS, state->clks);
+}
+
+static int imx8mq_mipi_csi_calc_hs_settle(struct csi_state *state)
+{
+ s64 link_freq;
+ u32 lane_rate;
+ unsigned long esc_clk_rate;
+ u32 min_ths_settle, max_ths_settle, ths_settle_ns, esc_clk_period_ns;
+
+ /* Calculate the line rate from the pixel rate. */
+ link_freq = v4l2_get_link_freq(state->src_sd->ctrl_handler,
+ state->csi2_fmt->width,
+ state->bus.num_data_lanes * 2);
+ if (link_freq < 0) {
+ dev_err(state->dev, "Unable to obtain link frequency: %d\n",
+ (int)link_freq);
+ return link_freq;
+ }
+
+ lane_rate = link_freq * 2;
+ if (lane_rate < 80000000 || lane_rate > 1500000000) {
+ dev_dbg(state->dev, "Out-of-bound lane rate %u\n", lane_rate);
+ return -EINVAL;
+ }
+
+ /*
+ * The D-PHY specification requires Ths-settle to be in the range
+ * 85ns + 6*UI to 140ns + 10*UI, with the unit interval UI being half
+ * the clock period.
+ *
+ * The Ths-settle value is expressed in the hardware as a multiple of
+ * the Esc clock period:
+ *
+ * Ths-settle = (PRG_RXHS_SETTLE + 1) * Tperiod of RxClkInEsc
+ *
+ * Due to the one cycle inaccuracy introduced by rounding, the
+ * documentation recommends picking a value away from the boundaries.
+ * Let's pick the average.
+ */
+ esc_clk_rate = clk_get_rate(state->clks[CSI2_CLK_ESC].clk);
+ if (!esc_clk_rate) {
+ dev_err(state->dev, "Could not get esc clock rate.\n");
+ return -EINVAL;
+ }
+
+ dev_dbg(state->dev, "esc clk rate: %lu\n", esc_clk_rate);
+ esc_clk_period_ns = 1000000000 / esc_clk_rate;
+
+ min_ths_settle = 85 + 6 * 1000000 / (lane_rate / 1000);
+ max_ths_settle = 140 + 10 * 1000000 / (lane_rate / 1000);
+ ths_settle_ns = (min_ths_settle + max_ths_settle) / 2;
+
+ state->hs_settle = ths_settle_ns / esc_clk_period_ns - 1;
+
+ dev_dbg(state->dev, "lane rate %u Ths_settle %u hs_settle %u\n",
+ lane_rate, ths_settle_ns, state->hs_settle);
+
+ return 0;
+}
+
+static int imx8mq_mipi_csi_start_stream(struct csi_state *state)
+{
+ int ret;
+
+ ret = imx8mq_mipi_csi_sw_reset(state);
+ if (ret)
+ return ret;
+
+ imx8mq_mipi_csi_set_params(state);
+ ret = imx8mq_mipi_csi_calc_hs_settle(state);
+ if (ret)
+ return ret;
+
+ imx8mq_mipi_csi_system_enable(state, true);
+
+ return 0;
+}
+
+static void imx8mq_mipi_csi_stop_stream(struct csi_state *state)
+{
+ imx8mq_mipi_csi_system_enable(state, false);
+}
+
+/* -----------------------------------------------------------------------------
+ * V4L2 subdev operations
+ */
+
+static struct csi_state *mipi_sd_to_csi2_state(struct v4l2_subdev *sdev)
+{
+ return container_of(sdev, struct csi_state, sd);
+}
+
+static int imx8mq_mipi_csi_s_stream(struct v4l2_subdev *sd, int enable)
+{
+ struct csi_state *state = mipi_sd_to_csi2_state(sd);
+ int ret = 0;
+
+ imx8mq_mipi_csi_write(state, CSI2RX_IRQ_MASK,
+ CSI2RX_IRQ_MASK_ULPS_STATUS_CHANGE);
+
+ if (enable) {
+ ret = pm_runtime_resume_and_get(state->dev);
+ if (ret < 0)
+ return ret;
+ }
+
+ mutex_lock(&state->lock);
+
+ if (enable) {
+ if (state->state & ST_SUSPENDED) {
+ ret = -EBUSY;
+ goto unlock;
+ }
+
+ ret = imx8mq_mipi_csi_start_stream(state);
+ if (ret < 0)
+ goto unlock;
+
+ ret = v4l2_subdev_call(state->src_sd, video, s_stream, 1);
+ if (ret < 0)
+ goto unlock;
+
+ state->state |= ST_STREAMING;
+ } else {
+ v4l2_subdev_call(state->src_sd, video, s_stream, 0);
+ imx8mq_mipi_csi_stop_stream(state);
+ state->state &= ~ST_STREAMING;
+ }
+
+unlock:
+ mutex_unlock(&state->lock);
+
+ if (!enable || ret < 0)
+ pm_runtime_put(state->dev);
+
+ return ret;
+}
+
+static struct v4l2_mbus_framefmt *
+imx8mq_mipi_csi_get_format(struct csi_state *state,
+ struct v4l2_subdev_state *sd_state,
+ enum v4l2_subdev_format_whence which,
+ unsigned int pad)
+{
+ if (which == V4L2_SUBDEV_FORMAT_TRY)
+ return v4l2_subdev_get_try_format(&state->sd, sd_state, pad);
+
+ return &state->format_mbus[pad];
+}
+
+static int imx8mq_mipi_csi_init_cfg(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *sd_state)
+{
+ struct csi_state *state = mipi_sd_to_csi2_state(sd);
+ struct v4l2_mbus_framefmt *fmt_sink;
+ struct v4l2_mbus_framefmt *fmt_source;
+ enum v4l2_subdev_format_whence which;
+
+ which = sd_state ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
+ fmt_sink = imx8mq_mipi_csi_get_format(state, sd_state, which,
+ MIPI_CSI2_PAD_SINK);
+
+ fmt_sink->code = MEDIA_BUS_FMT_SGBRG10_1X10;
+ fmt_sink->width = MIPI_CSI2_DEF_PIX_WIDTH;
+ fmt_sink->height = MIPI_CSI2_DEF_PIX_HEIGHT;
+ fmt_sink->field = V4L2_FIELD_NONE;
+
+ fmt_sink->colorspace = V4L2_COLORSPACE_RAW;
+ fmt_sink->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(fmt_sink->colorspace);
+ fmt_sink->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(fmt_sink->colorspace);
+ fmt_sink->quantization =
+ V4L2_MAP_QUANTIZATION_DEFAULT(false, fmt_sink->colorspace,
+ fmt_sink->ycbcr_enc);
+
+ fmt_source = imx8mq_mipi_csi_get_format(state, sd_state, which,
+ MIPI_CSI2_PAD_SOURCE);
+ *fmt_source = *fmt_sink;
+
+ return 0;
+}
+
+static int imx8mq_mipi_csi_get_fmt(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *sd_state,
+ struct v4l2_subdev_format *sdformat)
+{
+ struct csi_state *state = mipi_sd_to_csi2_state(sd);
+ struct v4l2_mbus_framefmt *fmt;
+
+ fmt = imx8mq_mipi_csi_get_format(state, sd_state, sdformat->which,
+ sdformat->pad);
+
+ mutex_lock(&state->lock);
+
+ sdformat->format = *fmt;
+
+ mutex_unlock(&state->lock);
+
+ return 0;
+}
+
+static int imx8mq_mipi_csi_enum_mbus_code(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *sd_state,
+ struct v4l2_subdev_mbus_code_enum *code)
+{
+ struct csi_state *state = mipi_sd_to_csi2_state(sd);
+
+ /*
+ * We can't transcode in any way, the source format is identical
+ * to the sink format.
+ */
+ if (code->pad == MIPI_CSI2_PAD_SOURCE) {
+ struct v4l2_mbus_framefmt *fmt;
+
+ if (code->index > 0)
+ return -EINVAL;
+
+ fmt = imx8mq_mipi_csi_get_format(state, sd_state, code->which,
+ code->pad);
+ code->code = fmt->code;
+ return 0;
+ }
+
+ if (code->pad != MIPI_CSI2_PAD_SINK)
+ return -EINVAL;
+
+ if (code->index >= ARRAY_SIZE(imx8mq_mipi_csi_formats))
+ return -EINVAL;
+
+ code->code = imx8mq_mipi_csi_formats[code->index].code;
+
+ return 0;
+}
+
+static int imx8mq_mipi_csi_set_fmt(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *sd_state,
+ struct v4l2_subdev_format *sdformat)
+{
+ struct csi_state *state = mipi_sd_to_csi2_state(sd);
+ struct csi2_pix_format const *csi2_fmt;
+ struct v4l2_mbus_framefmt *fmt;
+
+ /*
+ * The device can't transcode in any way, the source format can't be
+ * modified.
+ */
+ if (sdformat->pad == MIPI_CSI2_PAD_SOURCE)
+ return imx8mq_mipi_csi_get_fmt(sd, sd_state, sdformat);
+
+ if (sdformat->pad != MIPI_CSI2_PAD_SINK)
+ return -EINVAL;
+
+ csi2_fmt = find_csi2_format(sdformat->format.code);
+ if (!csi2_fmt)
+ csi2_fmt = &imx8mq_mipi_csi_formats[0];
+
+ fmt = imx8mq_mipi_csi_get_format(state, sd_state, sdformat->which,
+ sdformat->pad);
+
+ mutex_lock(&state->lock);
+
+ fmt->code = csi2_fmt->code;
+ fmt->width = sdformat->format.width;
+ fmt->height = sdformat->format.height;
+
+ sdformat->format = *fmt;
+
+ /* Propagate the format from sink to source. */
+ fmt = imx8mq_mipi_csi_get_format(state, sd_state, sdformat->which,
+ MIPI_CSI2_PAD_SOURCE);
+ *fmt = sdformat->format;
+
+ /* Store the CSI2 format descriptor for active formats. */
+ if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE)
+ state->csi2_fmt = csi2_fmt;
+
+ mutex_unlock(&state->lock);
+
+ return 0;
+}
+
+static const struct v4l2_subdev_video_ops imx8mq_mipi_csi_video_ops = {
+ .s_stream = imx8mq_mipi_csi_s_stream,
+};
+
+static const struct v4l2_subdev_pad_ops imx8mq_mipi_csi_pad_ops = {
+ .init_cfg = imx8mq_mipi_csi_init_cfg,
+ .enum_mbus_code = imx8mq_mipi_csi_enum_mbus_code,
+ .get_fmt = imx8mq_mipi_csi_get_fmt,
+ .set_fmt = imx8mq_mipi_csi_set_fmt,
+};
+
+static const struct v4l2_subdev_ops imx8mq_mipi_csi_subdev_ops = {
+ .video = &imx8mq_mipi_csi_video_ops,
+ .pad = &imx8mq_mipi_csi_pad_ops,
+};
+
+/* -----------------------------------------------------------------------------
+ * Media entity operations
+ */
+
+static const struct media_entity_operations imx8mq_mipi_csi_entity_ops = {
+ .link_validate = v4l2_subdev_link_validate,
+ .get_fwnode_pad = v4l2_subdev_get_fwnode_pad_1_to_1,
+};
+
+/* -----------------------------------------------------------------------------
+ * Async subdev notifier
+ */
+
+static struct csi_state *
+mipi_notifier_to_csi2_state(struct v4l2_async_notifier *n)
+{
+ return container_of(n, struct csi_state, notifier);
+}
+
+static int imx8mq_mipi_csi_notify_bound(struct v4l2_async_notifier *notifier,
+ struct v4l2_subdev *sd,
+ struct v4l2_async_subdev *asd)
+{
+ struct csi_state *state = mipi_notifier_to_csi2_state(notifier);
+ struct media_pad *sink = &state->sd.entity.pads[MIPI_CSI2_PAD_SINK];
+
+ state->src_sd = sd;
+
+ return v4l2_create_fwnode_links_to_pad(sd, sink, MEDIA_LNK_FL_ENABLED |
+ MEDIA_LNK_FL_IMMUTABLE);
+}
+
+static const struct v4l2_async_notifier_operations imx8mq_mipi_csi_notify_ops = {
+ .bound = imx8mq_mipi_csi_notify_bound,
+};
+
+static int imx8mq_mipi_csi_async_register(struct csi_state *state)
+{
+ struct v4l2_fwnode_endpoint vep = {
+ .bus_type = V4L2_MBUS_CSI2_DPHY,
+ };
+ struct v4l2_async_subdev *asd;
+ struct fwnode_handle *ep;
+ unsigned int i;
+ int ret;
+
+ v4l2_async_notifier_init(&state->notifier);
+
+ ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(state->dev), 0, 0,
+ FWNODE_GRAPH_ENDPOINT_NEXT);
+ if (!ep)
+ return -ENOTCONN;
+
+ ret = v4l2_fwnode_endpoint_parse(ep, &vep);
+ if (ret)
+ goto err_parse;
+
+ for (i = 0; i < vep.bus.mipi_csi2.num_data_lanes; ++i) {
+ if (vep.bus.mipi_csi2.data_lanes[i] != i + 1) {
+ dev_err(state->dev,
+ "data lanes reordering is not supported");
+ ret = -EINVAL;
+ goto err_parse;
+ }
+ }
+
+ state->bus = vep.bus.mipi_csi2;
+
+ dev_dbg(state->dev, "data lanes: %d flags: 0x%08x\n",
+ state->bus.num_data_lanes,
+ state->bus.flags);
+
+ asd = v4l2_async_notifier_add_fwnode_remote_subdev(&state->notifier,
+ ep, struct v4l2_async_subdev);
+ if (IS_ERR(asd)) {
+ ret = PTR_ERR(asd);
+ goto err_parse;
+ }
+
+ fwnode_handle_put(ep);
+
+ state->notifier.ops = &imx8mq_mipi_csi_notify_ops;
+
+ ret = v4l2_async_subdev_notifier_register(&state->sd, &state->notifier);
+ if (ret)
+ return ret;
+
+ return v4l2_async_register_subdev(&state->sd);
+
+err_parse:
+ fwnode_handle_put(ep);
+
+ return ret;
+}
+
+/* -----------------------------------------------------------------------------
+ * Suspend/resume
+ */
+
+static int imx8mq_mipi_csi_pm_suspend(struct device *dev, bool runtime)
+{
+ struct v4l2_subdev *sd = dev_get_drvdata(dev);
+ struct csi_state *state = mipi_sd_to_csi2_state(sd);
+ int ret = 0;
+
+ mutex_lock(&state->lock);
+
+ if (state->state & ST_POWERED) {
+ imx8mq_mipi_csi_stop_stream(state);
+ imx8mq_mipi_csi_clk_disable(state);
+ state->state &= ~ST_POWERED;
+ if (!runtime)
+ state->state |= ST_SUSPENDED;
+ }
+
+ mutex_unlock(&state->lock);
+
+ ret = icc_set_bw(state->icc_path, 0, 0);
+ if (ret)
+ dev_err(dev, "icc_set_bw failed with %d\n", ret);
+
+ return ret ? -EAGAIN : 0;
+}
+
+static int imx8mq_mipi_csi_pm_resume(struct device *dev, bool runtime)
+{
+ struct v4l2_subdev *sd = dev_get_drvdata(dev);
+ struct csi_state *state = mipi_sd_to_csi2_state(sd);
+ int ret = 0;
+
+ ret = icc_set_bw(state->icc_path, 0, state->icc_path_bw);
+ if (ret) {
+ dev_err(dev, "icc_set_bw failed with %d\n", ret);
+ return ret;
+ }
+
+ mutex_lock(&state->lock);
+
+ if (!runtime && !(state->state & ST_SUSPENDED))
+ goto unlock;
+
+ if (!(state->state & ST_POWERED)) {
+ state->state |= ST_POWERED;
+ ret = imx8mq_mipi_csi_clk_enable(state);
+ }
+ if (state->state & ST_STREAMING) {
+ ret = imx8mq_mipi_csi_start_stream(state);
+ if (ret)
+ goto unlock;
+ }
+
+ state->state &= ~ST_SUSPENDED;
+
+unlock:
+ mutex_unlock(&state->lock);
+
+ return ret ? -EAGAIN : 0;
+}
+
+static int __maybe_unused imx8mq_mipi_csi_suspend(struct device *dev)
+{
+ return imx8mq_mipi_csi_pm_suspend(dev, false);
+}
+
+static int __maybe_unused imx8mq_mipi_csi_resume(struct device *dev)
+{
+ return imx8mq_mipi_csi_pm_resume(dev, false);
+}
+
+static int __maybe_unused imx8mq_mipi_csi_runtime_suspend(struct device *dev)
+{
+ return imx8mq_mipi_csi_pm_suspend(dev, true);
+}
+
+static int __maybe_unused imx8mq_mipi_csi_runtime_resume(struct device *dev)
+{
+ return imx8mq_mipi_csi_pm_resume(dev, true);
+}
+
+static const struct dev_pm_ops imx8mq_mipi_csi_pm_ops = {
+ SET_RUNTIME_PM_OPS(imx8mq_mipi_csi_runtime_suspend,
+ imx8mq_mipi_csi_runtime_resume,
+ NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(imx8mq_mipi_csi_suspend, imx8mq_mipi_csi_resume)
+};
+
+/* -----------------------------------------------------------------------------
+ * Probe/remove & platform driver
+ */
+
+static int imx8mq_mipi_csi_subdev_init(struct csi_state *state)
+{
+ struct v4l2_subdev *sd = &state->sd;
+
+ v4l2_subdev_init(sd, &imx8mq_mipi_csi_subdev_ops);
+ sd->owner = THIS_MODULE;
+ snprintf(sd->name, sizeof(sd->name), "%s %s",
+ MIPI_CSI2_SUBDEV_NAME, dev_name(state->dev));
+
+ sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+
+ sd->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
+ sd->entity.ops = &imx8mq_mipi_csi_entity_ops;
+
+ sd->dev = state->dev;
+
+ state->csi2_fmt = &imx8mq_mipi_csi_formats[0];
+ imx8mq_mipi_csi_init_cfg(sd, NULL);
+
+ state->pads[MIPI_CSI2_PAD_SINK].flags = MEDIA_PAD_FL_SINK
+ | MEDIA_PAD_FL_MUST_CONNECT;
+ state->pads[MIPI_CSI2_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE
+ | MEDIA_PAD_FL_MUST_CONNECT;
+ return media_entity_pads_init(&sd->entity, MIPI_CSI2_PADS_NUM,
+ state->pads);
+}
+
+static void imx8mq_mipi_csi_release_icc(struct platform_device *pdev)
+{
+ struct v4l2_subdev *sd = dev_get_drvdata(&pdev->dev);
+ struct csi_state *state = mipi_sd_to_csi2_state(sd);
+
+ icc_put(state->icc_path);
+}
+
+static int imx8mq_mipi_csi_init_icc(struct platform_device *pdev)
+{
+ struct v4l2_subdev *sd = dev_get_drvdata(&pdev->dev);
+ struct csi_state *state = mipi_sd_to_csi2_state(sd);
+
+ /* Optional interconnect request */
+ state->icc_path = of_icc_get(&pdev->dev, "dram");
+ if (IS_ERR_OR_NULL(state->icc_path))
+ return PTR_ERR_OR_ZERO(state->icc_path);
+
+ state->icc_path_bw = MBps_to_icc(700);
+
+ return 0;
+}
+
+static int imx8mq_mipi_csi_parse_dt(struct csi_state *state)
+{
+ struct device *dev = state->dev;
+ struct device_node *np = state->dev->of_node;
+ struct device_node *node;
+ phandle ph;
+ u32 out_val[2];
+ int ret = 0;
+
+ state->rst = devm_reset_control_array_get_exclusive(dev);
+ if (IS_ERR(state->rst)) {
+ dev_err(dev, "Failed to get reset: %pe\n", state->rst);
+ return PTR_ERR(state->rst);
+ }
+
+ ret = of_property_read_u32_array(np, "fsl,mipi-phy-gpr", out_val,
+ ARRAY_SIZE(out_val));
+ if (ret) {
+ dev_err(dev, "no fsl,mipi-phy-gpr property found: %d\n", ret);
+ return ret;
+ }
+
+ ph = *out_val;
+
+ node = of_find_node_by_phandle(ph);
+ if (!node) {
+ dev_err(dev, "Error finding node by phandle\n");
+ return -ENODEV;
+ }
+ state->phy_gpr = syscon_node_to_regmap(node);
+ of_node_put(node);
+ if (IS_ERR(state->phy_gpr)) {
+ dev_err(dev, "failed to get gpr regmap: %pe\n", state->phy_gpr);
+ return PTR_ERR(state->phy_gpr);
+ }
+
+ state->phy_gpr_reg = out_val[1];
+ dev_dbg(dev, "phy gpr register set to 0x%x\n", state->phy_gpr_reg);
+
+ return ret;
+}
+
+static int imx8mq_mipi_csi_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct csi_state *state;
+ int ret;
+
+ state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
+ if (!state)
+ return -ENOMEM;
+
+ state->dev = dev;
+
+ ret = imx8mq_mipi_csi_parse_dt(state);
+ if (ret < 0) {
+ dev_err(dev, "Failed to parse device tree: %d\n", ret);
+ return ret;
+ }
+
+ /* Acquire resources. */
+ state->regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(state->regs))
+ return PTR_ERR(state->regs);
+
+ ret = imx8mq_mipi_csi_clk_get(state);
+ if (ret < 0)
+ return ret;
+
+ platform_set_drvdata(pdev, &state->sd);
+
+ mutex_init(&state->lock);
+
+ ret = imx8mq_mipi_csi_subdev_init(state);
+ if (ret < 0)
+ goto mutex;
+
+ ret = imx8mq_mipi_csi_init_icc(pdev);
+ if (ret)
+ goto mutex;
+
+ /* Enable runtime PM. */
+ pm_runtime_enable(dev);
+ if (!pm_runtime_enabled(dev)) {
+ ret = imx8mq_mipi_csi_pm_resume(dev, true);
+ if (ret < 0)
+ goto icc;
+ }
+
+ ret = imx8mq_mipi_csi_async_register(state);
+ if (ret < 0)
+ goto cleanup;
+
+ return 0;
+
+cleanup:
+ pm_runtime_disable(&pdev->dev);
+ imx8mq_mipi_csi_pm_suspend(&pdev->dev, true);
+
+ media_entity_cleanup(&state->sd.entity);
+ v4l2_async_notifier_unregister(&state->notifier);
+ v4l2_async_notifier_cleanup(&state->notifier);
+ v4l2_async_unregister_subdev(&state->sd);
+icc:
+ imx8mq_mipi_csi_release_icc(pdev);
+mutex:
+ mutex_destroy(&state->lock);
+
+ return ret;
+}
+
+static int imx8mq_mipi_csi_remove(struct platform_device *pdev)
+{
+ struct v4l2_subdev *sd = platform_get_drvdata(pdev);
+ struct csi_state *state = mipi_sd_to_csi2_state(sd);
+
+ v4l2_async_notifier_unregister(&state->notifier);
+ v4l2_async_notifier_cleanup(&state->notifier);
+ v4l2_async_unregister_subdev(&state->sd);
+
+ pm_runtime_disable(&pdev->dev);
+ imx8mq_mipi_csi_pm_suspend(&pdev->dev, true);
+ media_entity_cleanup(&state->sd.entity);
+ mutex_destroy(&state->lock);
+ pm_runtime_set_suspended(&pdev->dev);
+ imx8mq_mipi_csi_release_icc(pdev);
+
+ return 0;
+}
+
+static const struct of_device_id imx8mq_mipi_csi_of_match[] = {
+ { .compatible = "fsl,imx8mq-mipi-csi2", },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, imx8mq_mipi_csi_of_match);
+
+static struct platform_driver imx8mq_mipi_csi_driver = {
+ .probe = imx8mq_mipi_csi_probe,
+ .remove = imx8mq_mipi_csi_remove,
+ .driver = {
+ .of_match_table = imx8mq_mipi_csi_of_match,
+ .name = MIPI_CSI2_DRIVER_NAME,
+ .pm = &imx8mq_mipi_csi_pm_ops,
+ },
+};
+
+module_platform_driver(imx8mq_mipi_csi_driver);
+
+MODULE_DESCRIPTION("i.MX8MQ MIPI CSI-2 receiver driver");
+MODULE_AUTHOR("Martin Kepplinger <martin.kepplinger@puri.sm>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:imx8mq-mipi-csi2");
--
2.30.2