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Message-Id: <20181102154723.23662-4-kieran.bingham@ideasonboard.com>
Date: Fri, 2 Nov 2018 15:47:22 +0000
From: Kieran Bingham <kieran.bingham@...asonboard.com>
To: linux-renesas-soc@...r.kernel.org, linux-media@...r.kernel.org,
devicetree@...r.kernel.org, sakari.ailus@....fi
Cc: Niklas Söderlund <niklas.soderlund@...natech.se>,
Jacopo Mondi <jacopo@...ndi.org>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
linux-kernel@...r.kernel.org,
Jacopo Mondi <jacopo+renesas@...ndi.org>,
Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
Niklas Söderlund
<niklas.soderlund+renesas@...natech.se>
Subject: [PATCH v4 3/4] media: i2c: Add MAX9286 driver
From: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
The MAX9286 is a 4-channel GMSL deserializer with coax or STP input and
CSI-2 output. The device supports multicamera streaming applications,
and features the ability to synchronise the attached cameras.
CSI-2 output can be configured with 1 to 4 lanes, and a control channel
is supported over I2C, which implements an I2C mux to facilitate
communications with connected cameras across the reverse control
channel.
Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
--
v2:
- Fix MAINTAINERS entry
This posting is released with the following modifications to work
without Sakari's VC developments:
- max9286_g_mbus_config() re-instated
- max9286_get_frame_desc() is not bus/csi aware
- max9286_{get,set}_routing() removed
v3:
- Initialise notifier with v4l2_async_notifier_init
- Update for new mbus csi2 format V4L2_MBUS_CSI2_DPHY
v4: - Re-introduce required code to function with the VC series.
- Implement max9286_get_routing, max9286_set_routing
- Remove max9286_g_mbus_config
---
MAINTAINERS | 10 +
drivers/media/i2c/Kconfig | 11 +
drivers/media/i2c/Makefile | 1 +
drivers/media/i2c/max9286.c | 1189 +++++++++++++++++++++++++++++++++++
4 files changed, 1211 insertions(+)
create mode 100644 drivers/media/i2c/max9286.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 23021e0df5d7..745f0fd1fff1 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8864,6 +8864,16 @@ F: Documentation/devicetree/bindings/hwmon/max6697.txt
F: drivers/hwmon/max6697.c
F: include/linux/platform_data/max6697.h
+MAX9286 QUAD GMSL DESERIALIZER DRIVER
+M: Jacopo Mondi <jacopo+renesas@...ndi.org>
+M: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
+M: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
+M: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
+L: linux-media@...r.kernel.org
+S: Maintained
+F: Documentation/devicetree/bindings/media/i2c/max9286.txt
+F: drivers/media/i2c/max9286.c
+
MAX9860 MONO AUDIO VOICE CODEC DRIVER
M: Peter Rosin <peda@...ntia.se>
L: alsa-devel@...a-project.org (moderated for non-subscribers)
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 704af210e270..eadc00bdd3bf 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -472,6 +472,17 @@ config VIDEO_VPX3220
To compile this driver as a module, choose M here: the
module will be called vpx3220.
+config VIDEO_MAX9286
+ tristate "Maxim MAX9286 GMSL deserializer support"
+ depends on I2C && I2C_MUX
+ depends on VIDEO_V4L2_SUBDEV_API && MEDIA_CONTROLLER
+ select V4L2_FWNODE
+ help
+ This driver supports the Maxim MAX9286 GMSL deserializer.
+
+ To compile this driver as a module, choose M here: the
+ module will be called max9286.
+
comment "Video and audio decoders"
config VIDEO_SAA717X
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index 260d4d9ec2a1..4de7fe62b179 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -110,5 +110,6 @@ obj-$(CONFIG_VIDEO_IMX258) += imx258.o
obj-$(CONFIG_VIDEO_IMX274) += imx274.o
obj-$(CONFIG_VIDEO_IMX319) += imx319.o
obj-$(CONFIG_VIDEO_IMX355) += imx355.o
+obj-$(CONFIG_VIDEO_MAX9286) += max9286.o
obj-$(CONFIG_SDR_MAX2175) += max2175.o
diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
new file mode 100644
index 000000000000..c39c2f86e07d
--- /dev/null
+++ b/drivers/media/i2c/max9286.c
@@ -0,0 +1,1189 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Maxim MAX9286 GMSL Deserializer Driver
+ *
+ * Copyright (C) 2017-2018 Jacopo Mondi
+ * Copyright (C) 2017-2018 Kieran Bingham
+ * Copyright (C) 2017-2018 Laurent Pinchart
+ * Copyright (C) 2017-2018 Niklas Söderlund
+ * Copyright (C) 2016 Renesas Electronics Corporation
+ * Copyright (C) 2015 Cogent Embedded, Inc.
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/fwnode.h>
+#include <linux/i2c.h>
+#include <linux/i2c-mux.h>
+#include <linux/module.h>
+#include <linux/of_graph.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+
+#include <media/v4l2-async.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-subdev.h>
+
+/* Register 0x00 */
+#define MAX9286_MSTLINKSEL_AUTO (7 << 5)
+#define MAX9286_MSTLINKSEL(n) ((n) << 5)
+#define MAX9286_EN_VS_GEN BIT(4)
+#define MAX9286_LINKEN(n) (1 << (n))
+/* Register 0x01 */
+#define MAX9286_FSYNCMODE_ECU (3 << 6)
+#define MAX9286_FSYNCMODE_EXT (2 << 6)
+#define MAX9286_FSYNCMODE_INT_OUT (1 << 6)
+#define MAX9286_FSYNCMODE_INT_HIZ (0 << 6)
+#define MAX9286_GPIEN BIT(5)
+#define MAX9286_ENLMO_RSTFSYNC BIT(2)
+#define MAX9286_FSYNCMETH_AUTO (2 << 0)
+#define MAX9286_FSYNCMETH_SEMI_AUTO (1 << 0)
+#define MAX9286_FSYNCMETH_MANUAL (0 << 0)
+#define MAX9286_REG_FSYNC_PERIOD_L 0x06
+#define MAX9286_REG_FSYNC_PERIOD_M 0x07
+#define MAX9286_REG_FSYNC_PERIOD_H 0x08
+/* Register 0x0a */
+#define MAX9286_FWDCCEN(n) (1 << ((n) + 4))
+#define MAX9286_REVCCEN(n) (1 << (n))
+/* Register 0x0c */
+#define MAX9286_HVEN BIT(7)
+#define MAX9286_EDC_6BIT_HAMMING (2 << 5)
+#define MAX9286_EDC_6BIT_CRC (1 << 5)
+#define MAX9286_EDC_1BIT_PARITY (0 << 5)
+#define MAX9286_DESEL BIT(4)
+#define MAX9286_INVVS BIT(3)
+#define MAX9286_INVHS BIT(2)
+#define MAX9286_HVSRC_D0 (2 << 0)
+#define MAX9286_HVSRC_D14 (1 << 0)
+#define MAX9286_HVSRC_D18 (0 << 0)
+/* Register 0x12 */
+#define MAX9286_CSILANECNT(n) (((n) - 1) << 6)
+#define MAX9286_CSIDBL BIT(5)
+#define MAX9286_DBL BIT(4)
+#define MAX9286_DATATYPE_USER_8BIT (11 << 0)
+#define MAX9286_DATATYPE_USER_YUV_12BIT (10 << 0)
+#define MAX9286_DATATYPE_USER_24BIT (9 << 0)
+#define MAX9286_DATATYPE_RAW14 (8 << 0)
+#define MAX9286_DATATYPE_RAW11 (7 << 0)
+#define MAX9286_DATATYPE_RAW10 (6 << 0)
+#define MAX9286_DATATYPE_RAW8 (5 << 0)
+#define MAX9286_DATATYPE_YUV422_10BIT (4 << 0)
+#define MAX9286_DATATYPE_YUV422_8BIT (3 << 0)
+#define MAX9286_DATATYPE_RGB555 (2 << 0)
+#define MAX9286_DATATYPE_RGB565 (1 << 0)
+#define MAX9286_DATATYPE_RGB888 (0 << 0)
+/* Register 0x15 */
+#define MAX9286_VC(n) ((n) << 5)
+#define MAX9286_VCTYPE BIT(4)
+#define MAX9286_CSIOUTEN BIT(3)
+#define MAX9286_0X15_RESV (3 << 0)
+/* Register 0x1b */
+#define MAX9286_SWITCHIN(n) (1 << ((n) + 4))
+#define MAX9286_ENEQ(n) (1 << (n))
+/* Register 0x27 */
+#define MAX9286_LOCKED BIT(7)
+/* Register 0x31 */
+#define MAX9286_FSYNC_LOCKED BIT(6)
+/* Register 0x34 */
+#define MAX9286_I2CLOCACK BIT(7)
+#define MAX9286_I2CSLVSH_1046NS_469NS (3 << 5)
+#define MAX9286_I2CSLVSH_938NS_352NS (2 << 5)
+#define MAX9286_I2CSLVSH_469NS_234NS (1 << 5)
+#define MAX9286_I2CSLVSH_352NS_117NS (0 << 5)
+#define MAX9286_I2CMSTBT_837KBPS (7 << 2)
+#define MAX9286_I2CMSTBT_533KBPS (6 << 2)
+#define MAX9286_I2CMSTBT_339KBPS (5 << 2)
+#define MAX9286_I2CMSTBT_173KBPS (4 << 2)
+#define MAX9286_I2CMSTBT_105KBPS (3 << 2)
+#define MAX9286_I2CMSTBT_84KBPS (2 << 2)
+#define MAX9286_I2CMSTBT_28KBPS (1 << 2)
+#define MAX9286_I2CMSTBT_8KBPS (0 << 2)
+#define MAX9286_I2CSLVTO_NONE (3 << 0)
+#define MAX9286_I2CSLVTO_1024US (2 << 0)
+#define MAX9286_I2CSLVTO_256US (1 << 0)
+#define MAX9286_I2CSLVTO_64US (0 << 0)
+/* Register 0x3b */
+#define MAX9286_REV_TRF(n) ((n) << 4)
+#define MAX9286_REV_AMP(n) ((((n) - 30) / 10) << 1) /* in mV */
+#define MAX9286_REV_AMP_X BIT(0)
+/* Register 0x3f */
+#define MAX9286_EN_REV_CFG BIT(6)
+#define MAX9286_REV_FLEN(n) ((n) - 20)
+/* Register 0x49 */
+#define MAX9286_VIDEO_DETECT_MASK 0x0f
+/* Register 0x69 */
+#define MAX9286_LFLTBMONMASKED BIT(7)
+#define MAX9286_LOCKMONMASKED BIT(6)
+#define MAX9286_AUTOCOMBACKEN BIT(5)
+#define MAX9286_AUTOMASKEN BIT(4)
+#define MAX9286_MASKLINK(n) ((n) << 0)
+
+#define MAX9286_NUM_GMSL 4
+#define MAX9286_N_SINKS 4
+#define MAX9286_N_PADS 5
+#define MAX9286_SRC_PAD 4
+
+#define MAXIM_I2C_I2C_SPEED_400KHZ MAX9286_I2CMSTBT_339KBPS
+#define MAXIM_I2C_I2C_SPEED_100KHZ MAX9286_I2CMSTBT_105KBPS
+#define MAXIM_I2C_SPEED MAXIM_I2C_I2C_SPEED_100KHZ
+
+struct max9286_source {
+ struct v4l2_async_subdev asd;
+ struct v4l2_subdev *sd;
+ struct fwnode_handle *fwnode;
+};
+
+#define asd_to_max9286_source(_asd) \
+ container_of(_asd, struct max9286_source, asd)
+
+struct max9286_device {
+ struct i2c_client *client;
+ struct v4l2_subdev sd;
+ struct media_pad pads[MAX9286_N_PADS];
+ struct regulator *regulator;
+ bool poc_enabled;
+ int streaming;
+
+ struct i2c_mux_core *mux;
+ unsigned int mux_channel;
+
+ struct v4l2_ctrl_handler ctrls;
+
+ struct v4l2_mbus_framefmt fmt[MAX9286_N_SINKS];
+
+ unsigned int nsources;
+ unsigned int source_mask;
+ unsigned int route_mask;
+ unsigned int csi2_data_lanes;
+ struct max9286_source sources[MAX9286_NUM_GMSL];
+ struct v4l2_async_notifier notifier;
+};
+
+static struct max9286_source *next_source(struct max9286_device *max9286,
+ struct max9286_source *source)
+{
+ if (!source)
+ source = &max9286->sources[0];
+ else
+ source++;
+
+ for (; source < &max9286->sources[MAX9286_NUM_GMSL]; source++) {
+ if (source->fwnode)
+ return source;
+ }
+
+ return NULL;
+}
+
+#define for_each_source(max9286, source) \
+ for (source = NULL; (source = next_source(max9286, source)); )
+
+#define to_index(max9286, source) (source - &max9286->sources[0])
+
+#define sd_to_max9286(_sd) container_of(_sd, struct max9286_device, sd)
+
+/* -----------------------------------------------------------------------------
+ * I2C IO
+ */
+
+static int max9286_read(struct max9286_device *dev, u8 reg)
+{
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(dev->client, reg);
+ if (ret < 0)
+ dev_err(&dev->client->dev,
+ "%s: register 0x%02x read failed (%d)\n",
+ __func__, reg, ret);
+
+ return ret;
+}
+
+static int max9286_write(struct max9286_device *dev, u8 reg, u8 val)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(dev->client, reg, val);
+ if (ret < 0)
+ dev_err(&dev->client->dev,
+ "%s: register 0x%02x write failed (%d)\n",
+ __func__, reg, ret);
+
+ return ret;
+}
+
+/* -----------------------------------------------------------------------------
+ * I2C Multiplexer
+ */
+
+static int max9286_i2c_mux_close(struct max9286_device *dev)
+{
+
+ /* FIXME: See note in max9286_i2c_mux_select() */
+ if (dev->streaming)
+ return 0;
+ /*
+ * Ensure that both the forward and reverse channel are disabled on the
+ * mux, and that the channel ID is invalidated to ensure we reconfigure
+ * on the next select call.
+ */
+ dev->mux_channel = -1;
+ max9286_write(dev, 0x0a, 0x00);
+ usleep_range(3000, 5000);
+
+ return 0;
+}
+
+static int max9286_i2c_mux_select(struct i2c_mux_core *muxc, u32 chan)
+{
+ struct max9286_device *dev = i2c_mux_priv(muxc);
+
+ /*
+ * FIXME: This state keeping is a hack and do the job. It should
+ * be should be reworked. One option to consider is that once all
+ * cameras are programmed the mux selection logic should be disabled
+ * and all all reverse and forward channels enable all the time.
+ *
+ * In any case this logic with a int that have two states should be
+ * reworked!
+ */
+ if (dev->streaming == 1) {
+ max9286_write(dev, 0x0a, 0xff);
+ dev->streaming = 2;
+ return 0;
+ } else if (dev->streaming == 2) {
+ return 0;
+ }
+
+ if (dev->mux_channel == chan)
+ return 0;
+
+ dev->mux_channel = chan;
+
+ max9286_write(dev, 0x0a, MAX9286_FWDCCEN(chan) | MAX9286_REVCCEN(chan));
+
+ /*
+ * We must sleep after any change to the forward or reverse channel
+ * configuration.
+ */
+ usleep_range(3000, 5000);
+
+ return 0;
+}
+
+static int max9286_i2c_mux_init(struct max9286_device *dev)
+{
+ struct max9286_source *source;
+ int ret;
+
+ if (!i2c_check_functionality(dev->client->adapter,
+ I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
+ return -ENODEV;
+
+ dev->mux = i2c_mux_alloc(dev->client->adapter, &dev->client->dev,
+ dev->nsources, 0, I2C_MUX_LOCKED,
+ max9286_i2c_mux_select, NULL);
+ if (!dev->mux)
+ return -ENOMEM;
+
+ dev->mux->priv = dev;
+
+ for_each_source(dev, source) {
+ unsigned int index = to_index(dev, source);
+
+ ret = i2c_mux_add_adapter(dev->mux, 0, index, 0);
+ if (ret < 0)
+ goto error;
+ }
+
+ return 0;
+
+error:
+ i2c_mux_del_adapters(dev->mux);
+ return ret;
+}
+
+static void max9286_configure_i2c(struct max9286_device *dev, bool localack)
+{
+ u8 config = MAX9286_I2CSLVSH_469NS_234NS | MAX9286_I2CSLVTO_1024US |
+ MAXIM_I2C_SPEED;
+
+ if (localack)
+ config |= MAX9286_I2CLOCACK;
+
+ max9286_write(dev, 0x34, config);
+ usleep_range(3000, 5000);
+}
+
+/* -----------------------------------------------------------------------------
+ * V4L2 Subdev
+ */
+
+static int max9286_notify_bound(struct v4l2_async_notifier *notifier,
+ struct v4l2_subdev *subdev,
+ struct v4l2_async_subdev *asd)
+{
+ struct max9286_device *dev = sd_to_max9286(notifier->sd);
+ struct max9286_source *source = asd_to_max9286_source(asd);
+ unsigned int index = to_index(dev, source);
+ unsigned int src_pad;
+ int ret;
+
+ ret = media_entity_get_fwnode_pad(&subdev->entity,
+ source->fwnode,
+ MEDIA_PAD_FL_SOURCE);
+ if (ret < 0) {
+ dev_err(&dev->client->dev,
+ "Failed to find pad for %s\n", subdev->name);
+ return ret;
+ }
+
+ source->sd = subdev;
+ src_pad = ret;
+
+ ret = media_create_pad_link(&source->sd->entity, src_pad,
+ &dev->sd.entity, index,
+ MEDIA_LNK_FL_ENABLED |
+ MEDIA_LNK_FL_IMMUTABLE);
+ if (ret) {
+ dev_err(&dev->client->dev,
+ "Unable to link %s:%u -> %s:%u\n",
+ source->sd->name, src_pad, dev->sd.name, index);
+ return ret;
+ }
+
+ dev_dbg(&dev->client->dev, "Bound %s pad: %u on index %u\n",
+ subdev->name, src_pad, index);
+
+ return 0;
+}
+
+static void max9286_notify_unbind(struct v4l2_async_notifier *notifier,
+ struct v4l2_subdev *subdev,
+ struct v4l2_async_subdev *asd)
+{
+ struct max9286_source *source = asd_to_max9286_source(asd);
+
+ source->sd = NULL;
+}
+
+static const struct v4l2_async_notifier_operations max9286_notify_ops = {
+ .bound = max9286_notify_bound,
+ .unbind = max9286_notify_unbind,
+};
+
+/*
+ * max9286_check_video_links() - Make sure video links are detected and locked
+ *
+ * Performs safety checks on video link status. Make sure they are detected
+ * and all enabled links are locked.
+ *
+ * Returns 0 for success, -EIO for errors.
+ */
+static int max9286_check_video_links(struct max9286_device *dev)
+{
+ unsigned int i;
+ int ret;
+
+ /*
+ * Make sure valid video links are detected.
+ * The delay is not characterized in de-serializer manual, wait up
+ * to 5 ms.
+ */
+ for (i = 0; i < 10; i++) {
+ ret = max9286_read(dev, 0x49);
+ if (ret < 0)
+ return -EIO;
+
+ if ((ret & MAX9286_VIDEO_DETECT_MASK) == dev->source_mask)
+ break;
+
+ usleep_range(350, 500);
+ }
+
+ if (i == 10) {
+ dev_err(&dev->client->dev,
+ "Unable to detect video links: 0x%2x\n", ret);
+ return -EIO;
+ }
+
+ /* Make sure all enabled links are locked (4ms max). */
+ for (i = 0; i < 10; i++) {
+ ret = max9286_read(dev, 0x27);
+ if (ret < 0)
+ return -EIO;
+
+ if (ret & MAX9286_LOCKED)
+ break;
+
+ usleep_range(350, 450);
+ }
+
+ if (i == 10) {
+ dev_err(&dev->client->dev, "Not all enabled links locked\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int max9286_s_stream(struct v4l2_subdev *sd, int enable)
+{
+ struct max9286_device *dev = sd_to_max9286(sd);
+ struct max9286_source *source;
+ unsigned int i;
+ bool sync = false;
+ int ret;
+
+ if (enable) {
+ /* FIXME: See note in max9286_i2c_mux_select() */
+ dev->streaming = 1;
+
+ /* Start all cameras. */
+ for_each_source(dev, source) {
+ ret = v4l2_subdev_call(source->sd, video, s_stream, 1);
+ if (ret)
+ return ret;
+ }
+
+ ret = max9286_check_video_links(dev);
+ if (ret)
+ return ret;
+
+ /*
+ * Wait until frame synchronization is locked.
+ *
+ * Manual says frame sync locking should take ~6 VTS.
+ * From pratical experience at least 8 are required. Give
+ * 12 complete frames time (~33ms at 30 fps) to achieve frame
+ * locking before returning error.
+ */
+ for (i = 0; i < 36; i++) {
+ if (max9286_read(dev, 0x31) & MAX9286_FSYNC_LOCKED) {
+ sync = true;
+ break;
+ }
+ usleep_range(9000, 11000);
+ }
+
+ if (!sync) {
+ dev_err(&dev->client->dev,
+ "Failed to get frame synchronization\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Enable CSI output, VC set according to link number.
+ * Bit 7 must be set (chip manual says it's 0 and reserved).
+ */
+ max9286_write(dev, 0x15, 0x80 | MAX9286_VCTYPE |
+ MAX9286_CSIOUTEN | MAX9286_0X15_RESV);
+ } else {
+ max9286_write(dev, 0x15, MAX9286_VCTYPE | MAX9286_0X15_RESV);
+
+ /* Stop all cameras. */
+ for_each_source(dev, source)
+ v4l2_subdev_call(source->sd, video, s_stream, 0);
+
+ /* FIXME: See note in max9286_i2c_mux_select() */
+ dev->streaming = 0;
+ }
+
+ return 0;
+}
+
+static int max9286_enum_mbus_code(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_mbus_code_enum *code)
+{
+ if (code->pad || code->index > 0)
+ return -EINVAL;
+
+ code->code = MEDIA_BUS_FMT_UYVY8_2X8;
+
+ return 0;
+}
+
+static struct v4l2_mbus_framefmt *
+max9286_get_pad_format(struct max9286_device *dev,
+ struct v4l2_subdev_pad_config *cfg,
+ unsigned int pad, u32 which)
+{
+ switch (which) {
+ case V4L2_SUBDEV_FORMAT_TRY:
+ return v4l2_subdev_get_try_format(&dev->sd, cfg, pad);
+ case V4L2_SUBDEV_FORMAT_ACTIVE:
+ return &dev->fmt[pad];
+ default:
+ return NULL;
+ }
+}
+
+static int max9286_set_fmt(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_format *format)
+{
+ struct max9286_device *dev = sd_to_max9286(sd);
+ struct v4l2_mbus_framefmt *cfg_fmt;
+
+ if (format->pad >= MAX9286_SRC_PAD)
+ return -EINVAL;
+
+ /* Refuse non YUV422 formats as we hardcode DT to 8 bit YUV422 */
+ switch (format->format.code) {
+ case MEDIA_BUS_FMT_UYVY8_2X8:
+ case MEDIA_BUS_FMT_VYUY8_2X8:
+ case MEDIA_BUS_FMT_YUYV8_2X8:
+ case MEDIA_BUS_FMT_YVYU8_2X8:
+ break;
+ default:
+ format->format.code = MEDIA_BUS_FMT_YUYV8_2X8;
+ break;
+ }
+
+ cfg_fmt = max9286_get_pad_format(dev, cfg, format->pad, format->which);
+ if (!cfg_fmt)
+ return -EINVAL;
+
+ *cfg_fmt = format->format;
+
+ return 0;
+}
+
+static int max9286_get_fmt(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_format *format)
+{
+ struct max9286_device *dev = sd_to_max9286(sd);
+ struct v4l2_mbus_framefmt *cfg_fmt;
+
+ if (format->pad >= MAX9286_SRC_PAD)
+ return -EINVAL;
+
+ cfg_fmt = max9286_get_pad_format(dev, cfg, format->pad, format->which);
+ if (!cfg_fmt)
+ return -EINVAL;
+
+ format->format = *cfg_fmt;
+
+ return 0;
+}
+
+static int max9286_get_frame_desc(struct v4l2_subdev *sd, unsigned int pad,
+ struct v4l2_mbus_frame_desc *fd)
+{
+ struct max9286_device *dev = sd_to_max9286(sd);
+ struct max9286_source *source;
+ unsigned int i = 0;
+
+ memset(fd, 0, sizeof(*fd));
+
+ for_each_source(dev, source) {
+ unsigned int index = to_index(dev, source);
+
+ fd->entry[i].stream = i;
+ fd->entry[i].bus.csi2.channel = index;
+ fd->entry[i].bus.csi2.data_type = 0x1e;
+ i++;
+ }
+
+ fd->type = V4L2_MBUS_FRAME_DESC_TYPE_CSI2;
+ fd->num_entries = dev->nsources;
+
+ return 0;
+}
+
+static int max9286_get_routing(struct v4l2_subdev *sd,
+ struct v4l2_subdev_routing *routing)
+{
+ struct max9286_device *dev = sd_to_max9286(sd);
+ struct v4l2_subdev_route *r = routing->routes;
+ struct max9286_source *source;
+
+ /* There is one route per sink pad. */
+ if (routing->num_routes < dev->nsources) {
+ routing->num_routes = dev->nsources;
+ return -ENOSPC;
+ }
+
+ routing->num_routes = dev->nsources;
+
+ for_each_source(dev, source) {
+ unsigned int index = to_index(dev, source);
+
+ r->sink_pad = index;
+ r->sink_stream = 0;
+ r->source_pad = MAX9286_SRC_PAD;
+ r->source_stream = index;
+ r->flags = dev->route_mask & BIT(index) ?
+ V4L2_SUBDEV_ROUTE_FL_ACTIVE : 0;
+ r++;
+ }
+
+ return 0;
+}
+
+static int max9286_set_routing(struct v4l2_subdev *sd,
+ struct v4l2_subdev_routing *routing)
+{
+
+ struct max9286_device *dev = sd_to_max9286(sd);
+ struct v4l2_subdev_route *r = routing->routes;
+ unsigned int i;
+
+ if (routing->num_routes > dev->nsources)
+ return -ENOSPC;
+
+ for (i = 0; i < routing->num_routes; i++) {
+ if (r->sink_pad >= MAX9286_SRC_PAD ||
+ r->sink_stream != 0 ||
+ r->source_pad != MAX9286_SRC_PAD ||
+ r->source_stream != r->sink_pad)
+ return -EINVAL;
+
+ if (r->flags & V4L2_SUBDEV_ROUTE_FL_ACTIVE)
+ dev->route_mask |= BIT(r->sink_pad);
+ else
+ dev->route_mask &= ~BIT(r->sink_pad);
+
+ r++;
+ }
+
+ return 0;
+}
+
+static const struct v4l2_subdev_video_ops max9286_video_ops = {
+ .s_stream = max9286_s_stream,
+};
+
+static const struct v4l2_subdev_pad_ops max9286_pad_ops = {
+ .enum_mbus_code = max9286_enum_mbus_code,
+ .get_fmt = max9286_get_fmt,
+ .set_fmt = max9286_set_fmt,
+ .get_frame_desc = max9286_get_frame_desc,
+ .get_routing = max9286_get_routing,
+ .set_routing = max9286_set_routing,
+};
+
+static const struct v4l2_subdev_ops max9286_subdev_ops = {
+ .video = &max9286_video_ops,
+ .pad = &max9286_pad_ops,
+};
+
+static void max9286_init_format(struct v4l2_mbus_framefmt *fmt)
+{
+ fmt->width = 1280;
+ fmt->height = 800;
+ fmt->code = MEDIA_BUS_FMT_UYVY8_2X8;
+ fmt->colorspace = V4L2_COLORSPACE_SRGB;
+ fmt->field = V4L2_FIELD_NONE;
+ fmt->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
+ fmt->quantization = V4L2_QUANTIZATION_DEFAULT;
+ fmt->xfer_func = V4L2_XFER_FUNC_DEFAULT;
+}
+
+static int max9286_open(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh)
+{
+ struct v4l2_mbus_framefmt *format;
+ unsigned int i;
+
+ for (i = 0; i < MAX9286_N_SINKS; i++) {
+ format = v4l2_subdev_get_try_format(subdev, fh->pad, i);
+ max9286_init_format(format);
+ }
+
+ return 0;
+}
+
+static const struct v4l2_subdev_internal_ops max9286_subdev_internal_ops = {
+ .open = max9286_open,
+};
+
+/* -----------------------------------------------------------------------------
+ * Probe/Remove
+ */
+
+static int max9286_setup(struct max9286_device *dev)
+{
+ /*
+ * Link ordering values for all enabled links combinations. Orders must
+ * be assigned sequentially from 0 to the number of enabled links
+ * without leaving any hole for disabled links. We thus assign orders to
+ * enabled links first, and use the remaining order values for disabled
+ * links are all links must have a different order value;
+ */
+ static const u8 link_order[] = {
+ (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xxxx */
+ (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xxx0 */
+ (3 << 6) | (2 << 4) | (0 << 2) | (1 << 0), /* xx0x */
+ (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xx10 */
+ (3 << 6) | (0 << 4) | (2 << 2) | (1 << 0), /* x0xx */
+ (3 << 6) | (1 << 4) | (2 << 2) | (0 << 0), /* x1x0 */
+ (3 << 6) | (1 << 4) | (0 << 2) | (2 << 0), /* x10x */
+ (3 << 6) | (1 << 4) | (1 << 2) | (0 << 0), /* x210 */
+ (0 << 6) | (3 << 4) | (2 << 2) | (1 << 0), /* 0xxx */
+ (1 << 6) | (3 << 4) | (2 << 2) | (0 << 0), /* 1xx0 */
+ (1 << 6) | (3 << 4) | (0 << 2) | (2 << 0), /* 1x0x */
+ (2 << 6) | (3 << 4) | (1 << 2) | (0 << 0), /* 2x10 */
+ (1 << 6) | (0 << 4) | (3 << 2) | (2 << 0), /* 10xx */
+ (2 << 6) | (1 << 4) | (3 << 2) | (0 << 0), /* 21x0 */
+ (2 << 6) | (1 << 4) | (0 << 2) | (3 << 0), /* 210x */
+ (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* 3210 */
+ };
+
+ /*
+ * Set the I2C bus speed.
+ *
+ * Enable I2C Local Acknowledge during the probe sequences of the camera
+ * only. This should be disabled after the mux is initialised.
+ */
+ max9286_configure_i2c(dev, true);
+
+ /*
+ * Reverse channel setup.
+ *
+ * - Enable custom reverse channel configuration (through register 0x3f)
+ * and set the first pulse length to 35 clock cycles.
+ * - Increase the reverse channel amplitude to 170mV to accommodate the
+ * high threshold enabled by the serializer driver.
+ */
+ max9286_write(dev, 0x3f, MAX9286_EN_REV_CFG | MAX9286_REV_FLEN(35));
+ max9286_write(dev, 0x3b, MAX9286_REV_TRF(1) | MAX9286_REV_AMP(70) |
+ MAX9286_REV_AMP_X);
+
+ /*
+ * Enable GMSL links, mask unused ones and autodetect link
+ * used as CSI clock source.
+ */
+ max9286_write(dev, 0x00, MAX9286_MSTLINKSEL_AUTO | dev->route_mask);
+ max9286_write(dev, 0x0b, link_order[dev->route_mask]);
+ max9286_write(dev, 0x69, (0xf & ~dev->route_mask));
+
+ /*
+ * Video format setup:
+ * Disable CSI output, VC is set accordingly to Link number.
+ */
+ max9286_write(dev, 0x15, MAX9286_VCTYPE | MAX9286_0X15_RESV);
+
+ /* Enable CSI-2 Lane D0-D3 only, DBL mode, YUV422 8-bit. */
+ max9286_write(dev, 0x12, MAX9286_CSIDBL | MAX9286_DBL |
+ MAX9286_CSILANECNT(dev->csi2_data_lanes) |
+ MAX9286_DATATYPE_YUV422_8BIT);
+
+ /* Automatic: FRAMESYNC taken from the slowest Link. */
+ max9286_write(dev, 0x01, MAX9286_FSYNCMODE_INT_HIZ |
+ MAX9286_FSYNCMETH_AUTO);
+
+ /* Enable HS/VS encoding, use D14/15 for HS/VS, invert VS. */
+ max9286_write(dev, 0x0c, MAX9286_HVEN | MAX9286_INVVS |
+ MAX9286_HVSRC_D14);
+
+ /*
+ * Wait for 2ms to allow the link to resynchronize after the
+ * configuration change.
+ */
+ usleep_range(2000, 5000);
+
+ return 0;
+}
+
+static const struct of_device_id max9286_dt_ids[] = {
+ { .compatible = "maxim,max9286" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, max9286_dt_ids);
+
+static int max9286_init(struct device *dev, void *data)
+{
+ struct max9286_device *max9286;
+ struct i2c_client *client;
+ struct device_node *ep;
+ unsigned int i;
+ int ret;
+
+ /* Skip non-max9286 devices. */
+ if (!dev->of_node || !of_match_node(max9286_dt_ids, dev->of_node))
+ return 0;
+
+ client = to_i2c_client(dev);
+ max9286 = i2c_get_clientdata(client);
+
+ /* Enable the bus power. */
+ ret = regulator_enable(max9286->regulator);
+ if (ret < 0) {
+ dev_err(&client->dev, "Unable to turn PoC on\n");
+ return ret;
+ }
+
+ max9286->poc_enabled = true;
+
+ ret = max9286_setup(max9286);
+ if (ret) {
+ dev_err(dev, "Unable to setup max9286\n");
+ goto err_regulator;
+ }
+
+ v4l2_i2c_subdev_init(&max9286->sd, client, &max9286_subdev_ops);
+ max9286->sd.internal_ops = &max9286_subdev_internal_ops;
+ max9286->sd.flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
+
+ v4l2_ctrl_handler_init(&max9286->ctrls, 1);
+ /*
+ * FIXME: Compute the real pixel rate. The 50 MP/s value comes from the
+ * hardcoded frequency in the BSP CSI-2 receiver driver.
+ */
+ v4l2_ctrl_new_std(&max9286->ctrls, NULL, V4L2_CID_PIXEL_RATE,
+ 50000000, 50000000, 1, 50000000);
+ max9286->sd.ctrl_handler = &max9286->ctrls;
+ ret = max9286->ctrls.error;
+ if (ret)
+ goto err_regulator;
+
+ max9286->sd.entity.function = MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER;
+
+ max9286->pads[MAX9286_SRC_PAD].flags = MEDIA_PAD_FL_SOURCE;
+ for (i = 0; i < MAX9286_SRC_PAD; i++)
+ max9286->pads[i].flags = MEDIA_PAD_FL_SINK;
+ ret = media_entity_pads_init(&max9286->sd.entity, MAX9286_N_PADS,
+ max9286->pads);
+ if (ret)
+ goto err_regulator;
+
+ ep = of_graph_get_endpoint_by_regs(dev->of_node, MAX9286_SRC_PAD, -1);
+ if (!ep) {
+ dev_err(dev, "Unable to retrieve endpoint on \"port@4\"\n");
+ ret = -ENOENT;
+ goto err_regulator;
+ }
+ max9286->sd.fwnode = of_fwnode_handle(ep);
+
+ ret = v4l2_async_register_subdev(&max9286->sd);
+ if (ret < 0) {
+ dev_err(dev, "Unable to register subdevice\n");
+ goto err_put_node;
+ }
+
+ ret = max9286_i2c_mux_init(max9286);
+ if (ret) {
+ dev_err(dev, "Unable to initialize I2C multiplexer\n");
+ goto err_subdev_unregister;
+ }
+
+ /*
+ * Re-configure I2C with local acknowledge disabled after cameras
+ * have probed.
+ */
+ max9286_configure_i2c(max9286, false);
+
+ /* Leave the mux channels disabled until they are selected. */
+ max9286_i2c_mux_close(max9286);
+
+ return 0;
+
+err_subdev_unregister:
+ v4l2_async_unregister_subdev(&max9286->sd);
+ max9286_i2c_mux_close(max9286);
+err_put_node:
+ of_node_put(ep);
+err_regulator:
+ regulator_disable(max9286->regulator);
+ max9286->poc_enabled = false;
+
+ return ret;
+}
+
+static int max9286_is_bound(struct device *dev, void *data)
+{
+ struct device *this = data;
+ int ret;
+
+ if (dev == this)
+ return 0;
+
+ /* Skip non-max9286 devices. */
+ if (!dev->of_node || !of_match_node(max9286_dt_ids, dev->of_node))
+ return 0;
+
+ ret = device_is_bound(dev);
+ if (!ret)
+ return -EPROBE_DEFER;
+
+ return 0;
+}
+
+static struct device_node *max9286_get_i2c_by_id(struct device_node *parent,
+ u32 id)
+{
+ struct device_node *child;
+
+ for_each_child_of_node(parent, child) {
+ u32 i2c_id = 0;
+
+ if (of_node_cmp(child->name, "i2c") != 0)
+ continue;
+ of_property_read_u32(child, "reg", &i2c_id);
+ if (id == i2c_id)
+ return child;
+ }
+
+ return NULL;
+}
+
+static int max9286_check_i2c_bus_by_id(struct device *dev, int id)
+{
+ struct device_node *i2c_np;
+
+ i2c_np = max9286_get_i2c_by_id(dev->of_node, id);
+ if (!i2c_np) {
+ dev_err(dev, "Failed to find corresponding i2c@%u\n", id);
+ return -ENODEV;
+ }
+
+ if (!of_device_is_available(i2c_np)) {
+ dev_dbg(dev, "Skipping port %u with disabled I2C bus\n", id);
+ of_node_put(i2c_np);
+ return -ENODEV;
+ }
+
+ of_node_put(i2c_np);
+
+ return 0;
+}
+
+static void max9286_cleanup_dt(struct max9286_device *max9286)
+{
+ struct max9286_source *source;
+
+ /*
+ * Not strictly part of the DT, but the notifier is registered during
+ * max9286_parse_dt(), and the notifier holds references to the fwnodes
+ * thus the cleanup is here to mirror the registration.
+ */
+ v4l2_async_notifier_unregister(&max9286->notifier);
+
+ for_each_source(max9286, source) {
+ fwnode_handle_put(source->fwnode);
+ source->fwnode = NULL;
+ }
+}
+
+static int max9286_parse_dt(struct max9286_device *max9286)
+{
+ struct device *dev = &max9286->client->dev;
+ struct device_node *ep_np = NULL;
+ int ret;
+
+ v4l2_async_notifier_init(&max9286->notifier);
+
+ for_each_endpoint_of_node(dev->of_node, ep_np) {
+ struct max9286_source *source;
+ struct of_endpoint ep;
+
+ of_graph_parse_endpoint(ep_np, &ep);
+ dev_dbg(dev, "Endpoint %pOF on port %d",
+ ep.local_node, ep.port);
+
+ if (ep.port > MAX9286_NUM_GMSL) {
+ dev_err(dev, "Invalid endpoint %s on port %d",
+ of_node_full_name(ep.local_node),
+ ep.port);
+
+ continue;
+ }
+
+ /* For the source endpoint just parse the bus configuration. */
+ if (ep.port == MAX9286_SRC_PAD) {
+ struct v4l2_fwnode_endpoint vep;
+ int ret;
+
+ ret = v4l2_fwnode_endpoint_alloc_parse(
+ of_fwnode_handle(ep_np), &vep);
+ if (ret)
+ return ret;
+
+ if (vep.bus_type != V4L2_MBUS_CSI2_DPHY) {
+ dev_err(dev,
+ "Media bus %u type not supported\n",
+ vep.bus_type);
+ v4l2_fwnode_endpoint_free(&vep);
+ return -EINVAL;
+ }
+
+ max9286->csi2_data_lanes =
+ vep.bus.mipi_csi2.num_data_lanes;
+ v4l2_fwnode_endpoint_free(&vep);
+
+ continue;
+ }
+
+ /* Skip if the corresponding GMSL link is unavailable. */
+ if (max9286_check_i2c_bus_by_id(dev, ep.port))
+ continue;
+
+ if (max9286->sources[ep.port].fwnode) {
+ dev_err(dev,
+ "Multiple port endpoints are not supported: %d",
+ ep.port);
+
+ continue;
+ }
+
+ source = &max9286->sources[ep.port];
+ source->fwnode = fwnode_graph_get_remote_endpoint(
+ of_fwnode_handle(ep_np));
+ if (!source->fwnode) {
+ dev_err(dev,
+ "Endpoint %pOF has no remote endpoint connection\n",
+ ep.local_node);
+
+ continue;
+ }
+
+ source->asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
+ source->asd.match.fwnode = source->fwnode;
+
+ ret = v4l2_async_notifier_add_subdev(&max9286->notifier,
+ &source->asd);
+ if (ret) /* TODO: Cleanup notifier! */
+ return ret;
+
+ max9286->source_mask |= BIT(ep.port);
+ max9286->nsources++;
+ }
+
+ /* Do not register the subdev notifier if there are no devices. */
+ if (!max9286->nsources)
+ return 0;
+
+ max9286->route_mask = max9286->source_mask;
+ max9286->notifier.ops = &max9286_notify_ops;
+
+ return v4l2_async_subdev_notifier_register(&max9286->sd,
+ &max9286->notifier);
+}
+
+static int max9286_probe(struct i2c_client *client,
+ const struct i2c_device_id *did)
+{
+ struct max9286_device *dev;
+ unsigned int i;
+ int ret;
+
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ dev->client = client;
+ i2c_set_clientdata(client, dev);
+
+ for (i = 0; i < MAX9286_N_SINKS; i++)
+ max9286_init_format(&dev->fmt[i]);
+
+ ret = max9286_parse_dt(dev);
+ if (ret)
+ return ret;
+
+ dev->regulator = regulator_get(&client->dev, "poc");
+ if (IS_ERR(dev->regulator)) {
+ if (PTR_ERR(dev->regulator) != -EPROBE_DEFER)
+ dev_err(&client->dev,
+ "Unable to get PoC regulator (%ld)\n",
+ PTR_ERR(dev->regulator));
+ ret = PTR_ERR(dev->regulator);
+ goto err_free;
+ }
+
+ /*
+ * We can have multiple MAX9286 instances on the same physical I2C
+ * bus, and I2C children behind ports of separate MAX9286 instances
+ * having the same I2C address. As the MAX9286 starts by default with
+ * all ports enabled, we need to disable all ports on all MAX9286
+ * instances before proceeding to further initialize the devices and
+ * instantiate children.
+ *
+ * Start by just disabling all channels on the current device. Then,
+ * if all other MAX9286 on the parent bus have been probed, proceed
+ * to initialize them all, including the current one.
+ */
+ max9286_i2c_mux_close(dev);
+
+ /*
+ * The MAX9286 initialises with auto-acknowledge enabled by default.
+ * This means that if multiple MAX9286 devices are connected to an I2C
+ * bus, another MAX9286 could ack I2C transfers meant for a device on
+ * the other side of the GMSL links for this MAX9286 (such as a
+ * MAX9271). To prevent that disable auto-acknowledge early on; it
+ * will be enabled later as needed.
+ */
+ max9286_configure_i2c(dev, false);
+
+ ret = device_for_each_child(client->dev.parent, &client->dev,
+ max9286_is_bound);
+ if (ret)
+ return 0;
+
+ dev_dbg(&client->dev,
+ "All max9286 probed: start initialization sequence\n");
+ ret = device_for_each_child(client->dev.parent, NULL,
+ max9286_init);
+ if (ret < 0)
+ goto err_regulator;
+
+ /* Leave the mux channels disabled until they are selected. */
+ max9286_i2c_mux_close(dev);
+
+ return 0;
+
+err_regulator:
+ regulator_put(dev->regulator);
+ max9286_i2c_mux_close(dev);
+ max9286_configure_i2c(dev, false);
+err_free:
+ max9286_cleanup_dt(dev);
+ kfree(dev);
+
+ return ret;
+}
+
+static int max9286_remove(struct i2c_client *client)
+{
+ struct max9286_device *dev = i2c_get_clientdata(client);
+
+ i2c_mux_del_adapters(dev->mux);
+
+ fwnode_handle_put(dev->sd.fwnode);
+ v4l2_async_unregister_subdev(&dev->sd);
+
+ if (dev->poc_enabled)
+ regulator_disable(dev->regulator);
+ regulator_put(dev->regulator);
+
+ max9286_cleanup_dt(dev);
+ kfree(dev);
+
+ return 0;
+}
+
+static const struct i2c_device_id max9286_id[] = {
+ { "max9286", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, max9286_id);
+
+static struct i2c_driver max9286_i2c_driver = {
+ .driver = {
+ .name = "max9286",
+ .of_match_table = of_match_ptr(max9286_dt_ids),
+ },
+ .probe = max9286_probe,
+ .remove = max9286_remove,
+ .id_table = max9286_id,
+};
+
+module_i2c_driver(max9286_i2c_driver);
+
+MODULE_DESCRIPTION("Maxim MAX9286 GMSL Deserializer Driver");
+MODULE_AUTHOR("Vladimir Barinov");
+MODULE_LICENSE("GPL");
--
2.17.1
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