[RFC PATCH v4 00/14] Support for Tegra video capture from external sensor

[RFC PATCH v4 00/14] Support for Tegra video capture from external sensor

[Sowjanya Komatineni]

This series adds support for video capture from external camera sensor to
Tegra video driver.

Jetson TX1 has camera expansion connector and supports custom camera module
designed as per TX1 design specification.

This series also enables camera capture support for Jetson Nano which has
Raspberry PI camera header.

This series is tested with IMX219 camera sensor.

This series include,

VI I2C related fixes
- Camera sensor programming happens through VI I2C which is on host1x bus.
- These patches includes device tree and I2C driver fixes for VI I2C.

Tegra video driver updates
- TPG Vs Non-TPG based on Kconfig
- Support for external sensor video capture based on device graph from DT.
- Support for selection ioctl operations
- Tegra MIPI CSI pads calibration
- CSI T-CLK and T-HS settle time computation based on clock rates.

Host1x driver updates
- Adds API to allow creating mipi device for specific device node.
- Splits MIPI pads calibrate start and waiting for calibration to be done.

Device tree updates
- Adds camera connector 2V8, 1V8, 1V2 regulator supplies to Jetson TX1 DT.
- Enabled VI and CSI support in Jetson Nano DT.


Delta between patch versions:
[v4]:	Includes below fix based on v3 feedback
	- Patches are based on latest linux-next.
	- With split of tegra_mipi_calibrate() and tegra_mipi_wait(), mipi
	  clock is not left enabled till calibration done. This series adds
	  a patch to fix this by keeping clock enabled till calibration is
	  done.

	Note:
	Patch-0010 has compilation dependency on
	https://patchwork.kernel.org/patch/11659521/

[v3]:	Includes v2 feedback
	- Uses separate helper function for retrieving remote csi subdevice
	  and source subdevice.
	- Added check for presence of subdevice ops set/get_selection
	- dropped vb2_queue_release from driver and using
	  vb2_video_unregister_device instead of video_unregister_device.
	- video device register should happen in the last after all video
	  device related setup is done in the driver. This is being addressed
	  in below RFC patch. Once proper implementation of this is available
	  will update Tegra video driver to use split APIs and do all setup
	  prior to device register. Added this as TODO in the driver.
	  https://www.spinics.net/lists/linux-media/msg172761.html

	Note:
	Patch-0012 has compilation dependency on
	https://patchwork.kernel.org/patch/11659521/


[v2]:	Includes below changes based on v1 feedback
	- dt-binding document and the driver update for device graph to use
	  separate ports for sink endpoint and source endpoint for csi.
	- Use data-lanes endpoint property for csi.
	- Update tegra_mipi_request() to take device node pointer argument
	  rather than adding extra API.
	- Remove checking for clk pointer before clk_disable.


Sowjanya Komatineni (14):
  i2c: tegra: Don't mark VI I2C as IRQ safe runtime PM
  i2c: tegra: Remove NULL pointer check before
    clk_enable/disable/prepare/unprepare
  i2c: tegra: Fix the error path in tegra_i2c_runtime_resume
  i2c: tegra: Fix runtime resume to re-init VI I2C
  i2c: tegra: Avoid tegra_i2c_init_dma() for Tegra210 vi i2c
  media: tegra-video: Fix channel format alignment
  media: tegra-video: Enable TPG based on kernel config
  media: tegra-video: Update format lookup to offset based
  dt-bindings: tegra: Update VI and CSI bindings with port info
  media: tegra-video: Add support for external sensor capture
  media: tegra-video: Add support for selection ioctl ops
  gpu: host1x: mipi: Keep MIPI clock enabled till calibration is done
  media: tegra-video: Add CSI MIPI pads calibration
  media: tegra-video: Compute settle times based on the clock rate

 .../display/tegra/nvidia,tegra20-host1x.txt        |  92 ++-
 drivers/gpu/drm/tegra/dsi.c                        |   4 +-
 drivers/gpu/host1x/mipi.c                          |  19 +-
 drivers/i2c/busses/i2c-tegra.c                     | 101 +--
 drivers/staging/media/tegra-video/Kconfig          |   7 +
 drivers/staging/media/tegra-video/csi.c            | 258 ++++++-
 drivers/staging/media/tegra-video/csi.h            |   8 +
 drivers/staging/media/tegra-video/tegra210.c       |  25 +-
 drivers/staging/media/tegra-video/vi.c             | 800 +++++++++++++++++++--
 drivers/staging/media/tegra-video/vi.h             |  25 +-
 drivers/staging/media/tegra-video/video.c          |  23 +-
 include/linux/host1x.h                             |   5 +-
 12 files changed, 1224 insertions(+), 143 deletions(-)

-- 
2.7.4

[RFC PATCH v4 01/14] i2c: tegra: Don't mark VI I2C as IRQ safe runtime PM

[Sowjanya Komatineni]

Tegra VI I2C is part of VE power domain and typically used for
camera usecases.

VE power domain is not always on and is non-IRQ safe. So, IRQ safe
device cannot be attached to a non-IRQ safe domain as it prevents
powering off the PM domain and generic power domain driver will warn.

Current driver marks all I2C devices as IRQ safe and VI I2C device
does not require IRQ safe as it will not be used for atomic transfers.

This patch has fix to make VI I2C as non-IRQ safe.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 drivers/i2c/busses/i2c-tegra.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 1577296..3be1018 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -1750,7 +1750,15 @@ static int tegra_i2c_probe(struct platform_device *pdev)
 		goto unprepare_slow_clk;
 	}
 
-	pm_runtime_irq_safe(&pdev->dev);
+	/*
+	 * VI I2C is in VE power domain which is not always on and not
+	 * an IRQ safe. So, IRQ safe device can't be attached to a non-IRQ
+	 * safe domain as it prevents powering off the PM domain.
+	 * Also, VI I2C device don't need to use runtime IRQ safe as it will
+	 * not be used for atomic transfers.
+	 */
+	if (!i2c_dev->is_vi)
+		pm_runtime_irq_safe(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 	if (!pm_runtime_enabled(&pdev->dev)) {
 		ret = tegra_i2c_runtime_resume(&pdev->dev);
-- 
2.7.4

[RFC PATCH v4 02/14] i2c: tegra: Remove NULL pointer check before clk_enable/disable/prepare/unprepare

[Sowjanya Komatineni]

clk_enable, clk_disable, clk_prepare, and clk_unprepare APIs have
implementation for checking clk pointer not NULL and clock consumers
can safely call these APIs without NULL pointer check.

So, this patch cleans up Tegra i2c driver to remove explicit checks
before these APIs.

Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 drivers/i2c/busses/i2c-tegra.c | 64 +++++++++++++++---------------------------
 1 file changed, 23 insertions(+), 41 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 3be1018..c91307b9 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -655,21 +655,17 @@ static int __maybe_unused tegra_i2c_runtime_resume(struct device *dev)
 	if (ret)
 		return ret;
 
-	if (!i2c_dev->hw->has_single_clk_source) {
-		ret = clk_enable(i2c_dev->fast_clk);
-		if (ret < 0) {
-			dev_err(i2c_dev->dev,
-				"Enabling fast clk failed, err %d\n", ret);
-			return ret;
-		}
+	ret = clk_enable(i2c_dev->fast_clk);
+	if (ret < 0) {
+		dev_err(i2c_dev->dev,
+			"Enabling fast clk failed, err %d\n", ret);
+		return ret;
 	}
 
-	if (i2c_dev->slow_clk) {
-		ret = clk_enable(i2c_dev->slow_clk);
-		if (ret < 0) {
-			dev_err(dev, "failed to enable slow clock: %d\n", ret);
-			return ret;
-		}
+	ret = clk_enable(i2c_dev->slow_clk);
+	if (ret < 0) {
+		dev_err(dev, "failed to enable slow clock: %d\n", ret);
+		return ret;
 	}
 
 	ret = clk_enable(i2c_dev->div_clk);
@@ -688,12 +684,8 @@ static int __maybe_unused tegra_i2c_runtime_suspend(struct device *dev)
 	struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev);
 
 	clk_disable(i2c_dev->div_clk);
-
-	if (i2c_dev->slow_clk)
-		clk_disable(i2c_dev->slow_clk);
-
-	if (!i2c_dev->hw->has_single_clk_source)
-		clk_disable(i2c_dev->fast_clk);
+	clk_disable(i2c_dev->slow_clk);
+	clk_disable(i2c_dev->fast_clk);
 
 	return pinctrl_pm_select_idle_state(i2c_dev->dev);
 }
@@ -1716,20 +1708,16 @@ static int tegra_i2c_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, i2c_dev);
 
-	if (!i2c_dev->hw->has_single_clk_source) {
-		ret = clk_prepare(i2c_dev->fast_clk);
-		if (ret < 0) {
-			dev_err(i2c_dev->dev, "Clock prepare failed %d\n", ret);
-			return ret;
-		}
+	ret = clk_prepare(i2c_dev->fast_clk);
+	if (ret < 0) {
+		dev_err(i2c_dev->dev, "Clock prepare failed %d\n", ret);
+		return ret;
 	}
 
-	if (i2c_dev->slow_clk) {
-		ret = clk_prepare(i2c_dev->slow_clk);
-		if (ret < 0) {
-			dev_err(dev, "failed to prepare slow clock: %d\n", ret);
-			goto unprepare_fast_clk;
-		}
+	ret = clk_prepare(i2c_dev->slow_clk);
+	if (ret < 0) {
+		dev_err(dev, "failed to prepare slow clock: %d\n", ret);
+		goto unprepare_fast_clk;
 	}
 
 	if (i2c_dev->bus_clk_rate > I2C_MAX_FAST_MODE_FREQ &&
@@ -1843,12 +1831,10 @@ static int tegra_i2c_probe(struct platform_device *pdev)
 	clk_unprepare(i2c_dev->div_clk);
 
 unprepare_slow_clk:
-	if (i2c_dev->is_vi)
-		clk_unprepare(i2c_dev->slow_clk);
+	clk_unprepare(i2c_dev->slow_clk);
 
 unprepare_fast_clk:
-	if (!i2c_dev->hw->has_single_clk_source)
-		clk_unprepare(i2c_dev->fast_clk);
+	clk_unprepare(i2c_dev->fast_clk);
 
 	return ret;
 }
@@ -1867,12 +1853,8 @@ static int tegra_i2c_remove(struct platform_device *pdev)
 		tegra_i2c_runtime_suspend(&pdev->dev);
 
 	clk_unprepare(i2c_dev->div_clk);
-
-	if (i2c_dev->slow_clk)
-		clk_unprepare(i2c_dev->slow_clk);
-
-	if (!i2c_dev->hw->has_single_clk_source)
-		clk_unprepare(i2c_dev->fast_clk);
+	clk_unprepare(i2c_dev->slow_clk);
+	clk_unprepare(i2c_dev->fast_clk);
 
 	tegra_i2c_release_dma(i2c_dev);
 	return 0;
-- 
2.7.4

[RFC PATCH v4 03/14] i2c: tegra: Fix the error path in tegra_i2c_runtime_resume

[Sowjanya Komatineni]

tegra_i2c_runtime_resume does not disable prior enabled clocks
properly.

This patch fixes it.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 drivers/i2c/busses/i2c-tegra.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index c91307b9..7b93c45 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -665,18 +665,23 @@ static int __maybe_unused tegra_i2c_runtime_resume(struct device *dev)
 	ret = clk_enable(i2c_dev->slow_clk);
 	if (ret < 0) {
 		dev_err(dev, "failed to enable slow clock: %d\n", ret);
-		return ret;
+		goto disable_fast_clk;
 	}
 
 	ret = clk_enable(i2c_dev->div_clk);
 	if (ret < 0) {
 		dev_err(i2c_dev->dev,
 			"Enabling div clk failed, err %d\n", ret);
-		clk_disable(i2c_dev->fast_clk);
-		return ret;
+		goto disable_slow_clk;
 	}
 
 	return 0;
+
+disable_slow_clk:
+	clk_disable(i2c_dev->slow_clk);
+disable_fast_clk:
+	clk_disable(i2c_dev->fast_clk);
+	return ret;
 }
 
 static int __maybe_unused tegra_i2c_runtime_suspend(struct device *dev)
-- 
2.7.4

[RFC PATCH v4 04/14] i2c: tegra: Fix runtime resume to re-init VI I2C

[Sowjanya Komatineni]

VI I2C is on host1x bus and is part of VE power domain.

During suspend/resume VE power domain goes through power off/on.

So, controller reset followed by i2c re-initialization is required
after the domain power up.

This patch fixes it.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 drivers/i2c/busses/i2c-tegra.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 7b93c45..1bf3666 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -293,6 +293,8 @@ struct tegra_i2c_dev {
 	bool is_curr_atomic_xfer;
 };
 
+static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev, bool clk_reinit);
+
 static void dvc_writel(struct tegra_i2c_dev *i2c_dev, u32 val,
 		       unsigned long reg)
 {
@@ -675,8 +677,22 @@ static int __maybe_unused tegra_i2c_runtime_resume(struct device *dev)
 		goto disable_slow_clk;
 	}
 
+	/*
+	 * VI I2C device is attached to VE power domain which goes through
+	 * power ON/OFF during PM runtime resume/suspend. So, controller
+	 * should go through reset and need to re-initialize after power
+	 * domain ON.
+	 */
+	if (i2c_dev->is_vi) {
+		ret = tegra_i2c_init(i2c_dev, true);
+		if (ret)
+			goto disable_div_clk;
+	}
+
 	return 0;
 
+disable_div_clk:
+	clk_disable(i2c_dev->div_clk);
 disable_slow_clk:
 	clk_disable(i2c_dev->slow_clk);
 disable_fast_clk:
-- 
2.7.4

[RFC PATCH v4 05/14] i2c: tegra: Avoid tegra_i2c_init_dma() for Tegra210 vi i2c

[Sowjanya Komatineni]

VI I2C is on host1x bus so APB DMA can't be used for Tegra210 VI
I2C and there are no tx and rx dma channels for VI I2C.

So, avoid attempt of requesting DMA channels.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 drivers/i2c/busses/i2c-tegra.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 1bf3666..00d3e4d 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -421,7 +421,7 @@ static int tegra_i2c_init_dma(struct tegra_i2c_dev *i2c_dev)
 	dma_addr_t dma_phys;
 	int err;
 
-	if (!i2c_dev->hw->has_apb_dma)
+	if (!i2c_dev->hw->has_apb_dma || i2c_dev->is_vi)
 		return 0;
 
 	if (!IS_ENABLED(CONFIG_TEGRA20_APB_DMA)) {
-- 
2.7.4

[RFC PATCH v4 06/14] media: tegra-video: Fix channel format alignment

[Sowjanya Komatineni]

Pixel format width is mistakenly aligned to surface align bytes
and altering width to aligned value may force sensor mode change
other than the requested one and also cause mismatch in width
programmed between sensor and vi which can lead to capture errors.

This patch removes width alignment and clamps width as per Tegra
minimum and maximum limits.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 drivers/staging/media/tegra-video/vi.c | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/drivers/staging/media/tegra-video/vi.c b/drivers/staging/media/tegra-video/vi.c
index 1b5e660..d621ebc 100644
--- a/drivers/staging/media/tegra-video/vi.c
+++ b/drivers/staging/media/tegra-video/vi.c
@@ -359,25 +359,15 @@ static void tegra_channel_fmt_align(struct tegra_vi_channel *chan,
 				    struct v4l2_pix_format *pix,
 				    unsigned int bpp)
 {
-	unsigned int align;
-	unsigned int min_width;
-	unsigned int max_width;
-	unsigned int width;
 	unsigned int min_bpl;
 	unsigned int max_bpl;
 	unsigned int bpl;
 
 	/*
-	 * The transfer alignment requirements are expressed in bytes. Compute
-	 * minimum and maximum values, clamp the requested width and convert
-	 * it back to pixels. Use bytesperline to adjust the width.
+	 * The transfer alignment requirements are expressed in bytes.
+	 * Clamp the requested width and height to the limits.
 	 */
-	align = lcm(SURFACE_ALIGN_BYTES, bpp);
-	min_width = roundup(TEGRA_MIN_WIDTH, align);
-	max_width = rounddown(TEGRA_MAX_WIDTH, align);
-	width = roundup(pix->width * bpp, align);
-
-	pix->width = clamp(width, min_width, max_width) / bpp;
+	pix->width = clamp(pix->width, TEGRA_MIN_WIDTH, TEGRA_MAX_WIDTH);
 	pix->height = clamp(pix->height, TEGRA_MIN_HEIGHT, TEGRA_MAX_HEIGHT);
 
 	/* Clamp the requested bytes per line value. If the maximum bytes per
-- 
2.7.4

[RFC PATCH v4 07/14] media: tegra-video: Enable TPG based on kernel config

[Sowjanya Komatineni]

Tegra internal TPG mode is only for Tegra vi and csi testing
without a real sensor and driver should default support real
sensor.

So, This patch adds CONFIG_VIDEO_TEGRA_TPG and enables Tegra
internal TPG mode only when this config is selected.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 drivers/staging/media/tegra-video/Kconfig    |  6 +++++
 drivers/staging/media/tegra-video/csi.c      | 38 +++++++++++++++++++++++-----
 drivers/staging/media/tegra-video/tegra210.c |  6 +++++
 drivers/staging/media/tegra-video/vi.c       | 13 +++++++---
 drivers/staging/media/tegra-video/video.c    | 23 +++++++++--------
 5 files changed, 65 insertions(+), 21 deletions(-)

diff --git a/drivers/staging/media/tegra-video/Kconfig b/drivers/staging/media/tegra-video/Kconfig
index f6c61ec..566da62 100644
--- a/drivers/staging/media/tegra-video/Kconfig
+++ b/drivers/staging/media/tegra-video/Kconfig
@@ -10,3 +10,9 @@ config VIDEO_TEGRA
 
 	  To compile this driver as a module, choose M here: the module
 	  will be called tegra-video.
+
+config VIDEO_TEGRA_TPG
+	bool "NVIDIA Tegra VI driver TPG mode"
+	depends on VIDEO_TEGRA
+	help
+	  Say yes here to enable Tegra internal TPG mode
diff --git a/drivers/staging/media/tegra-video/csi.c b/drivers/staging/media/tegra-video/csi.c
index 40ea195..fb667df 100644
--- a/drivers/staging/media/tegra-video/csi.c
+++ b/drivers/staging/media/tegra-video/csi.c
@@ -62,6 +62,9 @@ static int csi_enum_bus_code(struct v4l2_subdev *subdev,
 			     struct v4l2_subdev_pad_config *cfg,
 			     struct v4l2_subdev_mbus_code_enum *code)
 {
+	if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
+		return -ENOIOCTLCMD;
+
 	if (code->index >= ARRAY_SIZE(tegra_csi_tpg_fmts))
 		return -EINVAL;
 
@@ -76,6 +79,9 @@ static int csi_get_format(struct v4l2_subdev *subdev,
 {
 	struct tegra_csi_channel *csi_chan = to_csi_chan(subdev);
 
+	if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
+		return -ENOIOCTLCMD;
+
 	fmt->format = csi_chan->format;
 
 	return 0;
@@ -121,6 +127,9 @@ static int csi_enum_framesizes(struct v4l2_subdev *subdev,
 {
 	unsigned int i;
 
+	if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
+		return -ENOIOCTLCMD;
+
 	if (fse->index >= ARRAY_SIZE(tegra_csi_tpg_sizes))
 		return -EINVAL;
 
@@ -148,6 +157,9 @@ static int csi_enum_frameintervals(struct v4l2_subdev *subdev,
 	const struct tpg_framerate *frmrate = csi->soc->tpg_frmrate_table;
 	int index;
 
+	if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
+		return -ENOIOCTLCMD;
+
 	/* one framerate per format and resolution */
 	if (fie->index > 0)
 		return -EINVAL;
@@ -172,6 +184,9 @@ static int csi_set_format(struct v4l2_subdev *subdev,
 	const struct v4l2_frmsize_discrete *sizes;
 	unsigned int i;
 
+	if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
+		return -ENOIOCTLCMD;
+
 	sizes = v4l2_find_nearest_size(tegra_csi_tpg_sizes,
 				       ARRAY_SIZE(tegra_csi_tpg_sizes),
 				       width, height,
@@ -208,6 +223,9 @@ static int tegra_csi_g_frame_interval(struct v4l2_subdev *subdev,
 {
 	struct tegra_csi_channel *csi_chan = to_csi_chan(subdev);
 
+	if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
+		return -ENOIOCTLCMD;
+
 	vfi->interval.numerator = 1;
 	vfi->interval.denominator = csi_chan->framerate;
 
@@ -311,8 +329,12 @@ static int tegra_csi_channel_init(struct tegra_csi_channel *chan)
 	subdev = &chan->subdev;
 	v4l2_subdev_init(subdev, &tegra_csi_ops);
 	subdev->dev = csi->dev;
-	snprintf(subdev->name, V4L2_SUBDEV_NAME_SIZE, "%s-%d", "tpg",
-		 chan->csi_port_num);
+	if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
+		snprintf(subdev->name, V4L2_SUBDEV_NAME_SIZE, "%s-%d", "tpg",
+			 chan->csi_port_num);
+	else
+		snprintf(subdev->name, V4L2_SUBDEV_NAME_SIZE, "%s",
+			 kbasename(chan->of_node->full_name));
 
 	v4l2_set_subdevdata(subdev, chan);
 	subdev->fwnode = of_fwnode_handle(chan->of_node);
@@ -405,11 +427,13 @@ static int tegra_csi_init(struct host1x_client *client)
 
 	INIT_LIST_HEAD(&csi->csi_chans);
 
-	ret = tegra_csi_tpg_channels_alloc(csi);
-	if (ret < 0) {
-		dev_err(csi->dev,
-			"failed to allocate tpg channels: %d\n", ret);
-		goto cleanup;
+	if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) {
+		ret = tegra_csi_tpg_channels_alloc(csi);
+		if (ret < 0) {
+			dev_err(csi->dev,
+				"failed to allocate tpg channels: %d\n", ret);
+			goto cleanup;
+		}
 	}
 
 	ret = tegra_csi_channels_init(csi);
diff --git a/drivers/staging/media/tegra-video/tegra210.c b/drivers/staging/media/tegra-video/tegra210.c
index 3baa4e3..3492a8a 100644
--- a/drivers/staging/media/tegra-video/tegra210.c
+++ b/drivers/staging/media/tegra-video/tegra210.c
@@ -631,7 +631,11 @@ const struct tegra_vi_soc tegra210_vi_soc = {
 	.ops = &tegra210_vi_ops,
 	.hw_revision = 3,
 	.vi_max_channels = 6,
+#if IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)
 	.vi_max_clk_hz = 499200000,
+#else
+	.vi_max_clk_hz = 998400000,
+#endif
 };
 
 /* Tegra210 CSI PHY registers accessors */
@@ -957,7 +961,9 @@ static const char * const tegra210_csi_cil_clks[] = {
 	"cilab",
 	"cilcd",
 	"cile",
+#if IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)
 	"csi_tpg",
+#endif
 };
 
 /* Tegra210 CSI operations */
diff --git a/drivers/staging/media/tegra-video/vi.c b/drivers/staging/media/tegra-video/vi.c
index d621ebc..0197f4e 100644
--- a/drivers/staging/media/tegra-video/vi.c
+++ b/drivers/staging/media/tegra-video/vi.c
@@ -565,6 +565,7 @@ static int tegra_channel_setup_ctrl_handler(struct tegra_vi_channel *chan)
 {
 	int ret;
 
+#if IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)
 	/* add test pattern control handler to v4l2 device */
 	v4l2_ctrl_new_std_menu_items(&chan->ctrl_handler, &vi_ctrl_ops,
 				     V4L2_CID_TEST_PATTERN,
@@ -576,6 +577,7 @@ static int tegra_channel_setup_ctrl_handler(struct tegra_vi_channel *chan)
 		v4l2_ctrl_handler_free(&chan->ctrl_handler);
 		return chan->ctrl_handler.error;
 	}
+#endif
 
 	/* setup the controls */
 	ret = v4l2_ctrl_handler_setup(&chan->ctrl_handler);
@@ -918,10 +920,13 @@ static int tegra_vi_init(struct host1x_client *client)
 
 	INIT_LIST_HEAD(&vi->vi_chans);
 
-	ret = tegra_vi_tpg_channels_alloc(vi);
-	if (ret < 0) {
-		dev_err(vi->dev, "failed to allocate tpg channels: %d\n", ret);
-		goto free_chans;
+	if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) {
+		ret = tegra_vi_tpg_channels_alloc(vi);
+		if (ret < 0) {
+			dev_err(vi->dev,
+				"failed to allocate tpg channels: %d\n", ret);
+			goto free_chans;
+		}
 	}
 
 	ret = tegra_vi_channels_init(vi);
diff --git a/drivers/staging/media/tegra-video/video.c b/drivers/staging/media/tegra-video/video.c
index 30816aa..e50bd70 100644
--- a/drivers/staging/media/tegra-video/video.c
+++ b/drivers/staging/media/tegra-video/video.c
@@ -60,15 +60,17 @@ static int host1x_video_probe(struct host1x_device *dev)
 	if (ret < 0)
 		goto unregister_v4l2;
 
-	/*
-	 * Both vi and csi channels are available now.
-	 * Register v4l2 nodes and create media links for TPG.
-	 */
-	ret = tegra_v4l2_nodes_setup_tpg(vid);
-	if (ret < 0) {
-		dev_err(&dev->dev,
-			"failed to setup tpg graph: %d\n", ret);
-		goto device_exit;
+	if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) {
+		/*
+		 * Both vi and csi channels are available now.
+		 * Register v4l2 nodes and create media links for TPG.
+		 */
+		ret = tegra_v4l2_nodes_setup_tpg(vid);
+		if (ret < 0) {
+			dev_err(&dev->dev,
+				"failed to setup tpg graph: %d\n", ret);
+			goto device_exit;
+		}
 	}
 
 	return 0;
@@ -91,7 +93,8 @@ static int host1x_video_remove(struct host1x_device *dev)
 {
 	struct tegra_video_device *vid = dev_get_drvdata(&dev->dev);
 
-	tegra_v4l2_nodes_cleanup_tpg(vid);
+	if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
+		tegra_v4l2_nodes_cleanup_tpg(vid);
 
 	host1x_device_exit(dev);
 
-- 
2.7.4

[RFC PATCH v4 08/14] media: tegra-video: Update format lookup to offset based

[Sowjanya Komatineni]

Tegra VI supported video formats are more for non TPG and there
can be multiple pixel formats for the same media bus format.

This patch updates the helper function for format lookup based on
mbus code from pre-defined Tegra supported format list to look from
the specified list index offset.

Offset based look up is used with sensor device graph (non TPG)
where format enumeration can list all supported formats for the
specific sensor mbus codes.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 drivers/staging/media/tegra-video/vi.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/media/tegra-video/vi.c b/drivers/staging/media/tegra-video/vi.c
index 0197f4e..52d751f 100644
--- a/drivers/staging/media/tegra-video/vi.c
+++ b/drivers/staging/media/tegra-video/vi.c
@@ -53,11 +53,12 @@ to_tegra_channel_buffer(struct vb2_v4l2_buffer *vb)
 }
 
 static int tegra_get_format_idx_by_code(struct tegra_vi *vi,
-					unsigned int code)
+					unsigned int code,
+					unsigned int offset)
 {
 	unsigned int i;
 
-	for (i = 0; i < vi->soc->nformats; ++i) {
+	for (i = offset; i < vi->soc->nformats; ++i) {
 		if (vi->soc->video_formats[i].code == code)
 			return i;
 	}
@@ -598,11 +599,12 @@ static void vi_tpg_fmts_bitmap_init(struct tegra_vi_channel *chan)
 	bitmap_zero(chan->tpg_fmts_bitmap, MAX_FORMAT_NUM);
 
 	index = tegra_get_format_idx_by_code(chan->vi,
-					     MEDIA_BUS_FMT_SRGGB10_1X10);
+					     MEDIA_BUS_FMT_SRGGB10_1X10, 0);
 	bitmap_set(chan->tpg_fmts_bitmap, index, 1);
 
 	index = tegra_get_format_idx_by_code(chan->vi,
-					     MEDIA_BUS_FMT_RGB888_1X32_PADHI);
+					     MEDIA_BUS_FMT_RGB888_1X32_PADHI,
+					     0);
 	bitmap_set(chan->tpg_fmts_bitmap, index, 1);
 }
 
-- 
2.7.4

[RFC PATCH v4 09/14] dt-bindings: tegra: Update VI and CSI bindings with port info

[Sowjanya Komatineni]

Update VI and CSI bindings to add port and endpoint nodes as per
media video-interfaces DT binding document.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 .../display/tegra/nvidia,tegra20-host1x.txt        | 92 +++++++++++++++++++++-
 1 file changed, 90 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt
index 4731921..ac63ae4a 100644
--- a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt
+++ b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt
@@ -51,8 +51,16 @@ of the following host1x client modules:
       - vi
   - Tegra210:
     - power-domains: Must include venc powergate node as vi is in VE partition.
-  - Tegra210 has CSI part of VI sharing same host interface and register space.
-    So, VI device node should have CSI child node.
+
+  ports (optional node)
+  vi can have optional ports node and max 6 ports are supported. Each port
+  should have single 'endpoint' child node. All port nodes are grouped under
+  ports node. Please refer to the bindings defined in
+  Documentation/devicetree/bindings/media/video-interfaces.txt
+
+  csi (required node)
+  Tegra210 has CSI part of VI sharing same host interface and register space.
+  So, VI device node should have CSI child node.
 
     - csi: mipi csi interface to vi
 
@@ -65,6 +73,46 @@ of the following host1x client modules:
       - power-domains: Must include sor powergate node as csicil is in
         SOR partition.
 
+      channel (optional nodes)
+      Maximum 6 channels are supported with each csi brick as either x4 or x2
+      based on hw connectivity to sensor.
+
+      Required properties:
+      - reg: csi port number. Valid port numbers are 0 through 5.
+      - nvidia,mipi-calibrate: Should contain a phandle and a specifier
+        specifying which pads are used by this CSI port and need to be
+	calibrated. See also ../display/tegra/nvidia,tegra114-mipi.txt.
+
+      Each channel node must contain 2 port nodes which can be grouped
+      under 'ports' node and each port should have a single child 'endpoint'
+      node.
+
+        ports node
+        Please refer to the bindings defined in
+        Documentation/devicetree/bindings/media/video-interfaces.txt
+
+        ports node must contain below 2 port nodes.
+        port@0 with single child 'endpoint' node always a sink.
+        port@1 with single child 'endpoint' node always a source.
+
+        port@0 (required node)
+        Required properties:
+        - reg: 0
+
+	  endpoint (required node)
+	  Required properties:
+	  - data-lanes: an array of data lane from 1 to 4. Valid array
+	    lengths are 1/2/4.
+	  - remote-endpoint: phandle to sensor 'endpoint' node.
+
+        port@1 (required node)
+        Required properties:
+        - reg: 1
+
+	  endpoint (required node)
+	  Required properties:
+	  - remote-endpoint: phandle to vi port 'endpoint' node.
+
 - epp: encoder pre-processor
 
   Required properties:
@@ -340,6 +388,18 @@ Example:
 
 			ranges = <0x0 0x0 0x54080000 0x2000>;
 
+			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				port@0 {
+					reg = <0>;
+					imx219_vi_in0: endpoint {
+						remote-endpoint = <&imx219_csi_out0>;
+					};
+				};
+			};
+
 			csi@838 {
 				compatible = "nvidia,tegra210-csi";
 				reg = <0x838 0x1300>;
@@ -362,6 +422,34 @@ Example:
 					 <&tegra_car TEGRA210_CLK_CSI_TPG>;
 				clock-names = "csi", "cilab", "cilcd", "cile", "csi_tpg";
 				power-domains = <&pd_sor>;
+
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				channel@0 {
+					reg = <0>;
+					nvidia,mipi-calibrate = <&mipi 0x001>;
+
+					ports {
+						#address-cells = <1>;
+						#size-cells = <0>;
+
+						port@0 {
+							reg = <0>;
+							imx219_csi_in0: endpoint {
+								data-lanes = <1 2>;
+								remote-endpoint = <&imx219_out0>;
+							};
+						};
+
+						port@1 {
+							reg = <1>;
+							imx219_csi_out0: endpoint {
+								remote-endpoint = <&imx219_vi_in0>;
+							};
+						};
+					};
+				};
 			};
 		};
 
-- 
2.7.4

[RFC PATCH v4 10/14] media: tegra-video: Add support for external sensor capture

[Sowjanya Komatineni]

This patch adds support to capture from the external sensor
based on device graph in the device tree.

Driver walks through the device graph to create media links
between the entities and registers and unregisters video devices
when the corresponding sub-devices are bound and unbound.

Channel formats are enumerated based on available formats from
the sensor and the corresponding matched formats from the Tegra
supported video formats list.

Each Tegra CSI instance can be configured as 4-lane or 2-lane
based on supported lane configuration from the sensor through
the device tree.

Currently this driver supports V4L2 video node centric only.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 drivers/staging/media/tegra-video/Kconfig    |   1 +
 drivers/staging/media/tegra-video/csi.c      | 130 +++++-
 drivers/staging/media/tegra-video/csi.h      |   1 +
 drivers/staging/media/tegra-video/tegra210.c |   2 +-
 drivers/staging/media/tegra-video/vi.c       | 648 +++++++++++++++++++++++++--
 drivers/staging/media/tegra-video/vi.h       |  25 +-
 6 files changed, 749 insertions(+), 58 deletions(-)

diff --git a/drivers/staging/media/tegra-video/Kconfig b/drivers/staging/media/tegra-video/Kconfig
index 566da62..1f35da4 100644
--- a/drivers/staging/media/tegra-video/Kconfig
+++ b/drivers/staging/media/tegra-video/Kconfig
@@ -5,6 +5,7 @@ config VIDEO_TEGRA
 	depends on VIDEO_V4L2
 	select MEDIA_CONTROLLER
 	select VIDEOBUF2_DMA_CONTIG
+	select V4L2_FWNODE
 	help
 	  Choose this option if you have an NVIDIA Tegra SoC.
 
diff --git a/drivers/staging/media/tegra-video/csi.c b/drivers/staging/media/tegra-video/csi.c
index fb667df..c21dd09 100644
--- a/drivers/staging/media/tegra-video/csi.c
+++ b/drivers/staging/media/tegra-video/csi.c
@@ -9,10 +9,13 @@
 #include <linux/host1x.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_graph.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 
+#include <media/v4l2-fwnode.h>
+
 #include "csi.h"
 #include "video.h"
 
@@ -285,26 +288,101 @@ static const struct v4l2_subdev_ops tegra_csi_ops = {
 	.pad    = &tegra_csi_pad_ops,
 };
 
+static int tegra_csi_channel_alloc(struct tegra_csi *csi,
+				   struct device_node *node,
+				   unsigned int port_num, unsigned int lanes,
+				   unsigned int num_pads)
+{
+	struct tegra_csi_channel *chan;
+
+	chan = kzalloc(sizeof(*chan), GFP_KERNEL);
+	if (!chan)
+		return -ENOMEM;
+
+	list_add_tail(&chan->list, &csi->csi_chans);
+	chan->csi = csi;
+	chan->csi_port_num = port_num;
+	chan->numlanes = lanes;
+	chan->of_node = node;
+	chan->numpads = num_pads;
+	if (num_pads & 0x2) {
+		chan->pads[0].flags = MEDIA_PAD_FL_SINK;
+		chan->pads[1].flags = MEDIA_PAD_FL_SOURCE;
+	} else {
+		chan->pads[0].flags = MEDIA_PAD_FL_SOURCE;
+	}
+
+	return 0;
+}
+
 static int tegra_csi_tpg_channels_alloc(struct tegra_csi *csi)
 {
 	struct device_node *node = csi->dev->of_node;
 	unsigned int port_num;
-	struct tegra_csi_channel *chan;
 	unsigned int tpg_channels = csi->soc->csi_max_channels;
+	int ret;
 
 	/* allocate CSI channel for each CSI x2 ports */
 	for (port_num = 0; port_num < tpg_channels; port_num++) {
-		chan = kzalloc(sizeof(*chan), GFP_KERNEL);
-		if (!chan)
-			return -ENOMEM;
-
-		list_add_tail(&chan->list, &csi->csi_chans);
-		chan->csi = csi;
-		chan->csi_port_num = port_num;
-		chan->numlanes = 2;
-		chan->of_node = node;
-		chan->numpads = 1;
-		chan->pads[0].flags = MEDIA_PAD_FL_SOURCE;
+		ret = tegra_csi_channel_alloc(csi, node, port_num, 2, 1);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int tegra_csi_channels_alloc(struct tegra_csi *csi)
+{
+	struct device_node *node = csi->dev->of_node;
+	struct v4l2_fwnode_endpoint v4l2_ep = {
+		.bus_type = V4L2_MBUS_CSI2_DPHY
+	};
+	struct fwnode_handle *fwh;
+	struct device_node *channel;
+	struct device_node *ep;
+	unsigned int lanes, portno, num_pads;
+	int ret;
+
+	for_each_child_of_node(node, channel) {
+		if (!of_node_name_eq(channel, "channel"))
+			continue;
+
+		ret = of_property_read_u32(channel, "reg", &portno);
+		if (ret < 0)
+			continue;
+
+		if (portno >= csi->soc->csi_max_channels) {
+			dev_err(csi->dev, "invalid port num %d\n", portno);
+			return -EINVAL;
+		}
+
+		ep = of_graph_get_endpoint_by_regs(channel, 0, 0);
+		if (!ep)
+			continue;
+
+		fwh = of_fwnode_handle(ep);
+		ret = v4l2_fwnode_endpoint_parse(fwh, &v4l2_ep);
+		of_node_put(ep);
+		if (ret) {
+			dev_err(csi->dev,
+				"failed to parse v4l2 endpoint: %d\n", ret);
+			return ret;
+		}
+
+		lanes = v4l2_ep.bus.mipi_csi2.num_data_lanes;
+		if (!lanes || ((lanes & (lanes - 1)) != 0)) {
+			dev_err(csi->dev, "invalid data-lanes %d\n", lanes);
+			return -EINVAL;
+		}
+
+		num_pads = of_graph_get_endpoint_count(channel);
+		if (num_pads == TEGRA_CSI_PADS_NUM) {
+			ret = tegra_csi_channel_alloc(csi, channel, portno,
+						      lanes, num_pads);
+			if (ret < 0)
+				return ret;
+		}
 	}
 
 	return 0;
@@ -350,6 +428,15 @@ static int tegra_csi_channel_init(struct tegra_csi_channel *chan)
 		return ret;
 	}
 
+	if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) {
+		ret = v4l2_async_register_subdev(subdev);
+		if (ret < 0) {
+			dev_err(csi->dev,
+				"failed to register subdev: %d\n", ret);
+			return ret;
+		}
+	}
+
 	return 0;
 }
 
@@ -389,8 +476,12 @@ static void tegra_csi_channels_cleanup(struct tegra_csi *csi)
 
 	list_for_each_entry_safe(chan, tmp, &csi->csi_chans, list) {
 		subdev = &chan->subdev;
-		if (subdev->dev)
+		if (subdev->dev) {
+			if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
+				v4l2_async_unregister_subdev(subdev);
 			media_entity_cleanup(&subdev->entity);
+		}
+
 		list_del(&chan->list);
 		kfree(chan);
 	}
@@ -427,13 +518,14 @@ static int tegra_csi_init(struct host1x_client *client)
 
 	INIT_LIST_HEAD(&csi->csi_chans);
 
-	if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) {
+	if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
 		ret = tegra_csi_tpg_channels_alloc(csi);
-		if (ret < 0) {
-			dev_err(csi->dev,
-				"failed to allocate tpg channels: %d\n", ret);
-			goto cleanup;
-		}
+	else
+		ret = tegra_csi_channels_alloc(csi);
+	if (ret < 0) {
+		dev_err(csi->dev,
+			"failed to allocate channels: %d\n", ret);
+		goto cleanup;
 	}
 
 	ret = tegra_csi_channels_init(csi);
diff --git a/drivers/staging/media/tegra-video/csi.h b/drivers/staging/media/tegra-video/csi.h
index 93bd2a0..78a5110 100644
--- a/drivers/staging/media/tegra-video/csi.h
+++ b/drivers/staging/media/tegra-video/csi.h
@@ -7,6 +7,7 @@
 #define __TEGRA_CSI_H__
 
 #include <media/media-entity.h>
+#include <media/v4l2-async.h>
 #include <media/v4l2-subdev.h>
 
 /*
diff --git a/drivers/staging/media/tegra-video/tegra210.c b/drivers/staging/media/tegra-video/tegra210.c
index 3492a8a..253bf33 100644
--- a/drivers/staging/media/tegra-video/tegra210.c
+++ b/drivers/staging/media/tegra-video/tegra210.c
@@ -230,7 +230,7 @@ static void tegra_channel_capture_error_recover(struct tegra_vi_channel *chan)
 	tegra_channel_capture_setup(chan);
 
 	/* recover CSI block */
-	subdev = tegra_channel_get_remote_subdev(chan);
+	subdev = tegra_channel_get_remote_csi_subdev(chan);
 	tegra_csi_error_recover(subdev);
 }
 
diff --git a/drivers/staging/media/tegra-video/vi.c b/drivers/staging/media/tegra-video/vi.c
index 52d751f..f7dbea2 100644
--- a/drivers/staging/media/tegra-video/vi.c
+++ b/drivers/staging/media/tegra-video/vi.c
@@ -12,6 +12,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/of_graph.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>
 #include <linux/pm_runtime.h>
@@ -52,6 +53,12 @@ to_tegra_channel_buffer(struct vb2_v4l2_buffer *vb)
 	return container_of(vb, struct tegra_channel_buffer, buf);
 }
 
+static inline struct tegra_vi_graph_entity *
+to_tegra_vi_graph_entity(struct v4l2_async_subdev *asd)
+{
+	return container_of(asd, struct tegra_vi_graph_entity, asd);
+}
+
 static int tegra_get_format_idx_by_code(struct tegra_vi *vi,
 					unsigned int code,
 					unsigned int offset)
@@ -146,28 +153,64 @@ static void tegra_channel_buffer_queue(struct vb2_buffer *vb)
 }
 
 struct v4l2_subdev *
-tegra_channel_get_remote_subdev(struct tegra_vi_channel *chan)
+tegra_channel_get_remote_csi_subdev(struct tegra_vi_channel *chan)
+{
+	struct media_pad *pad;
+
+	pad = media_entity_remote_pad(&chan->pad);
+	if (!pad)
+		return NULL;
+
+	return media_entity_to_v4l2_subdev(pad->entity);
+}
+
+struct v4l2_subdev *
+tegra_channel_get_remote_source_subdev(struct tegra_vi_channel *chan)
 {
 	struct media_pad *pad;
 	struct v4l2_subdev *subdev;
 	struct media_entity *entity;
 
-	pad = media_entity_remote_pad(&chan->pad);
-	entity = pad->entity;
-	subdev = media_entity_to_v4l2_subdev(entity);
+	subdev = tegra_channel_get_remote_csi_subdev(chan);
+	if (!subdev)
+		return NULL;
+
+	pad = &subdev->entity.pads[0];
+	while (!(pad->flags & MEDIA_PAD_FL_SOURCE)) {
+		pad = media_entity_remote_pad(pad);
+		if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
+			break;
+		entity = pad->entity;
+		pad = &entity->pads[0];
+		subdev = media_entity_to_v4l2_subdev(entity);
+	}
 
 	return subdev;
 }
 
 int tegra_channel_set_stream(struct tegra_vi_channel *chan, bool on)
 {
-	struct v4l2_subdev *subdev;
+	struct v4l2_subdev *subdev, *csi_subdev, *src_subdev;
 	int ret;
 
-	/* stream CSI */
-	subdev = tegra_channel_get_remote_subdev(chan);
+	csi_subdev = tegra_channel_get_remote_csi_subdev(chan);
+	src_subdev = tegra_channel_get_remote_source_subdev(chan);
+	/*
+	 * Tegra CSI receiver can detect the first LP to HS transition.
+	 * So, start the CSI stream-on prior to sensor stream-on and
+	 * vice-versa for stream-off.
+	 */
+	subdev = on ? csi_subdev : src_subdev;
 	ret = v4l2_subdev_call(subdev, video, s_stream, on);
-	if (on && ret < 0 && ret != -ENOIOCTLCMD)
+	if (ret < 0 && ret != -ENOIOCTLCMD)
+		return ret;
+
+	if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
+		return 0;
+
+	subdev = on ? src_subdev : csi_subdev;
+	ret = v4l2_subdev_call(subdev, video, s_stream, on);
+	if (ret < 0 && ret != -ENOIOCTLCMD)
 		return ret;
 
 	return 0;
@@ -252,7 +295,7 @@ static int tegra_channel_g_parm(struct file *file, void *fh,
 	struct tegra_vi_channel *chan = video_drvdata(file);
 	struct v4l2_subdev *subdev;
 
-	subdev = tegra_channel_get_remote_subdev(chan);
+	subdev = tegra_channel_get_remote_source_subdev(chan);
 	return v4l2_g_parm_cap(&chan->video, subdev, a);
 }
 
@@ -262,7 +305,7 @@ static int tegra_channel_s_parm(struct file *file, void *fh,
 	struct tegra_vi_channel *chan = video_drvdata(file);
 	struct v4l2_subdev *subdev;
 
-	subdev = tegra_channel_get_remote_subdev(chan);
+	subdev = tegra_channel_get_remote_source_subdev(chan);
 	return v4l2_s_parm_cap(&chan->video, subdev, a);
 }
 
@@ -284,7 +327,7 @@ static int tegra_channel_enum_framesizes(struct file *file, void *fh,
 
 	fse.code = fmtinfo->code;
 
-	subdev = tegra_channel_get_remote_subdev(chan);
+	subdev = tegra_channel_get_remote_source_subdev(chan);
 	ret = v4l2_subdev_call(subdev, pad, enum_frame_size, NULL, &fse);
 	if (ret)
 		return ret;
@@ -316,7 +359,7 @@ static int tegra_channel_enum_frameintervals(struct file *file, void *fh,
 
 	fie.code = fmtinfo->code;
 
-	subdev = tegra_channel_get_remote_subdev(chan);
+	subdev = tegra_channel_get_remote_source_subdev(chan);
 	ret = v4l2_subdev_call(subdev, pad, enum_frame_interval, NULL, &fie);
 	if (ret)
 		return ret;
@@ -335,6 +378,9 @@ static int tegra_channel_enum_format(struct file *file, void *fh,
 	unsigned int index = 0, i;
 	unsigned long *fmts_bitmap = chan->tpg_fmts_bitmap;
 
+	if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
+		fmts_bitmap = chan->fmts_bitmap;
+
 	if (f->index >= bitmap_weight(fmts_bitmap, MAX_FORMAT_NUM))
 		return -EINVAL;
 
@@ -391,8 +437,12 @@ static int __tegra_channel_try_format(struct tegra_vi_channel *chan,
 	struct v4l2_subdev *subdev;
 	struct v4l2_subdev_format fmt;
 	struct v4l2_subdev_pad_config *pad_cfg;
+	int ret;
+
+	subdev = tegra_channel_get_remote_source_subdev(chan);
+	if (!subdev)
+		return -ENODEV;
 
-	subdev = tegra_channel_get_remote_subdev(chan);
 	pad_cfg = v4l2_subdev_alloc_pad_config(subdev);
 	if (!pad_cfg)
 		return -ENOMEM;
@@ -412,7 +462,10 @@ static int __tegra_channel_try_format(struct tegra_vi_channel *chan,
 	fmt.which = V4L2_SUBDEV_FORMAT_TRY;
 	fmt.pad = 0;
 	v4l2_fill_mbus_format(&fmt.format, pix, fmtinfo->code);
-	v4l2_subdev_call(subdev, pad, set_fmt, pad_cfg, &fmt);
+	ret = v4l2_subdev_call(subdev, pad, set_fmt, pad_cfg, &fmt);
+	if (ret < 0)
+		return ret;
+
 	v4l2_fill_pix_format(pix, &fmt.format);
 	tegra_channel_fmt_align(chan, pix, fmtinfo->bpp);
 
@@ -452,8 +505,11 @@ static int tegra_channel_set_format(struct file *file, void *fh,
 	fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 	fmt.pad = 0;
 	v4l2_fill_mbus_format(&fmt.format, pix, fmtinfo->code);
-	subdev = tegra_channel_get_remote_subdev(chan);
-	v4l2_subdev_call(subdev, pad, set_fmt, NULL, &fmt);
+	subdev = tegra_channel_get_remote_source_subdev(chan);
+	ret = v4l2_subdev_call(subdev, pad, set_fmt, NULL, &fmt);
+	if (ret < 0)
+		return ret;
+
 	v4l2_fill_pix_format(pix, &fmt.format);
 	tegra_channel_fmt_align(chan, pix, fmtinfo->bpp);
 
@@ -463,15 +519,50 @@ static int tegra_channel_set_format(struct file *file, void *fh,
 	return 0;
 }
 
+static int tegra_channel_set_subdev_active_fmt(struct tegra_vi_channel *chan)
+{
+	int ret, index;
+	struct v4l2_subdev *subdev;
+	struct v4l2_subdev_format fmt = {
+		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
+	};
+
+	/*
+	 * Initialize channel format to the sub-device active format if there
+	 * is corresponding match in the Tegra supported video formats.
+	 */
+	subdev = tegra_channel_get_remote_source_subdev(chan);
+	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
+	if (ret)
+		return ret;
+
+	index = tegra_get_format_idx_by_code(chan->vi, fmt.format.code, 0);
+	if (index < 0)
+		return -EINVAL;
+
+	chan->fmtinfo = &chan->vi->soc->video_formats[index];
+	v4l2_fill_pix_format(&chan->format, &fmt.format);
+	chan->format.pixelformat = chan->fmtinfo->fourcc;
+	chan->format.bytesperline = chan->format.width * chan->fmtinfo->bpp;
+	chan->format.sizeimage = chan->format.bytesperline *
+				 chan->format.height;
+	tegra_channel_fmt_align(chan, &chan->format, chan->fmtinfo->bpp);
+
+	return 0;
+}
+
 static int tegra_channel_enum_input(struct file *file, void *fh,
 				    struct v4l2_input *inp)
 {
-	/* currently driver supports internal TPG only */
+	struct tegra_vi_channel *chan = video_drvdata(file);
+	struct v4l2_subdev *subdev;
+
 	if (inp->index)
 		return -EINVAL;
 
 	inp->type = V4L2_INPUT_TYPE_CAMERA;
-	strscpy(inp->name, "Tegra TPG", sizeof(inp->name));
+	subdev = tegra_channel_get_remote_source_subdev(chan);
+	strscpy(inp->name, subdev->name, sizeof(inp->name));
 
 	return 0;
 }
@@ -578,6 +669,22 @@ static int tegra_channel_setup_ctrl_handler(struct tegra_vi_channel *chan)
 		v4l2_ctrl_handler_free(&chan->ctrl_handler);
 		return chan->ctrl_handler.error;
 	}
+#else
+	struct v4l2_subdev *subdev;
+
+	subdev = tegra_channel_get_remote_source_subdev(chan);
+	if (!subdev)
+		return -ENODEV;
+
+	ret = v4l2_ctrl_add_handler(&chan->ctrl_handler, subdev->ctrl_handler,
+				    NULL, true);
+	if (ret < 0) {
+		dev_err(chan->vi->dev,
+			"failed to add subdev %s ctrl handler: %d\n",
+			subdev->name, ret);
+		v4l2_ctrl_handler_free(&chan->ctrl_handler);
+		return ret;
+	}
 #endif
 
 	/* setup the controls */
@@ -608,6 +715,61 @@ static void vi_tpg_fmts_bitmap_init(struct tegra_vi_channel *chan)
 	bitmap_set(chan->tpg_fmts_bitmap, index, 1);
 }
 
+static int vi_fmts_bitmap_init(struct tegra_vi_channel *chan)
+{
+	int index, ret, match_code = 0;
+	struct v4l2_subdev *subdev;
+	struct v4l2_subdev_mbus_code_enum code = {
+		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
+	};
+
+	bitmap_zero(chan->fmts_bitmap, MAX_FORMAT_NUM);
+
+	/*
+	 * Set the bitmap bits based on all the matched formats between the
+	 * available media bus formats of sub-device and the pre-defined Tegra
+	 * supported video formats.
+	 */
+	subdev = tegra_channel_get_remote_source_subdev(chan);
+	while (1) {
+		ret = v4l2_subdev_call(subdev, pad, enum_mbus_code,
+				       NULL, &code);
+		if (ret < 0)
+			break;
+
+		index = tegra_get_format_idx_by_code(chan->vi, code.code, 0);
+		while (index >= 0) {
+			bitmap_set(chan->fmts_bitmap, index, 1);
+			if (!match_code)
+				match_code = code.code;
+			/* look for other formats with same mbus code */
+			index = tegra_get_format_idx_by_code(chan->vi,
+							     code.code,
+							     index + 1);
+		}
+
+		code.index++;
+	}
+
+	/*
+	 * Set the bitmap bit corresponding to default tegra video format if
+	 * there are no matched formats.
+	 */
+	if (!match_code) {
+		match_code = tegra_default_format.code;
+		index = tegra_get_format_idx_by_code(chan->vi, match_code, 0);
+		if (WARN_ON(index < 0))
+			return -EINVAL;
+
+		bitmap_set(chan->fmts_bitmap, index, 1);
+	}
+
+	/* initialize channel format to the sub-device active format */
+	tegra_channel_set_subdev_active_fmt(chan);
+
+	return 0;
+}
+
 static void tegra_channel_cleanup(struct tegra_vi_channel *chan)
 {
 	v4l2_ctrl_handler_free(&chan->ctrl_handler);
@@ -720,6 +882,9 @@ static int tegra_channel_init(struct tegra_vi_channel *chan)
 		goto free_v4l2_ctrl_hdl;
 	}
 
+	if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
+		v4l2_async_notifier_init(&chan->notifier);
+
 	return 0;
 
 free_v4l2_ctrl_hdl:
@@ -733,28 +898,84 @@ static int tegra_channel_init(struct tegra_vi_channel *chan)
 	return ret;
 }
 
-static int tegra_vi_tpg_channels_alloc(struct tegra_vi *vi)
+static int tegra_vi_channel_alloc(struct tegra_vi *vi, unsigned int port_num,
+				  struct device_node *node)
 {
 	struct tegra_vi_channel *chan;
+
+	/*
+	 * Do not use devm_kzalloc as memory is freed immediately
+	 * when device instance is unbound but application might still
+	 * be holding the device node open. Channel memory allocated
+	 * with kzalloc is freed during video device release callback.
+	 */
+	chan = kzalloc(sizeof(*chan), GFP_KERNEL);
+	if (!chan)
+		return -ENOMEM;
+
+	chan->vi = vi;
+	chan->portno = port_num;
+	chan->of_node = node;
+	list_add_tail(&chan->list, &vi->vi_chans);
+
+	return 0;
+}
+
+static int tegra_vi_tpg_channels_alloc(struct tegra_vi *vi)
+{
 	unsigned int port_num;
 	unsigned int nchannels = vi->soc->vi_max_channels;
+	int ret;
 
 	for (port_num = 0; port_num < nchannels; port_num++) {
-		/*
-		 * Do not use devm_kzalloc as memory is freed immediately
-		 * when device instance is unbound but application might still
-		 * be holding the device node open. Channel memory allocated
-		 * with kzalloc is freed during video device release callback.
-		 */
-		chan = kzalloc(sizeof(*chan), GFP_KERNEL);
-		if (!chan)
-			return -ENOMEM;
+		ret = tegra_vi_channel_alloc(vi, port_num, vi->dev->of_node);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int tegra_vi_channels_alloc(struct tegra_vi *vi)
+{
+	struct device_node *node = vi->dev->of_node;
+	struct device_node *ep = NULL;
+	struct device_node *ports;
+	struct device_node *port;
+	unsigned int port_num;
+	int ret;
+
+	ports = of_get_child_by_name(node, "ports");
+	if (!ports)
+		return -ENODEV;
+
+	for_each_child_of_node(ports, port) {
+		if (!of_node_name_eq(port, "port"))
+			continue;
+
+		ret = of_property_read_u32(port, "reg", &port_num);
+		if (ret < 0)
+			continue;
+
+		if (port_num > vi->soc->vi_max_channels) {
+			of_node_put(ports);
+			dev_err(vi->dev, "invalid port num %d\n", port_num);
+			return -EINVAL;
+		}
 
-		chan->vi = vi;
-		chan->portno = port_num;
-		list_add_tail(&chan->list, &vi->vi_chans);
+		ep = of_get_child_by_name(port, "endpoint");
+		if (!ep)
+			continue;
+
+		of_node_put(ep);
+		ret = tegra_vi_channel_alloc(vi, port_num, port);
+		if (ret < 0) {
+			of_node_put(ports);
+			return ret;
+		}
 	}
 
+	of_node_put(ports);
 	return 0;
 }
 
@@ -909,6 +1130,347 @@ static int __maybe_unused vi_runtime_suspend(struct device *dev)
 	return 0;
 }
 
+/*
+ * Graph Management
+ */
+static struct tegra_vi_graph_entity *
+tegra_vi_graph_find_entity(struct tegra_vi_channel *chan,
+			   const struct fwnode_handle *fwnode)
+{
+	struct tegra_vi_graph_entity *entity;
+	struct v4l2_async_subdev *asd;
+
+	list_for_each_entry(asd, &chan->notifier.asd_list, asd_list) {
+		entity = to_tegra_vi_graph_entity(asd);
+		if (entity->asd.match.fwnode == fwnode)
+			return entity;
+	}
+
+	return NULL;
+}
+
+static int tegra_vi_graph_build(struct tegra_vi_channel *chan,
+				struct tegra_vi_graph_entity *entity)
+{
+	struct tegra_vi *vi = chan->vi;
+	struct tegra_vi_graph_entity *ent;
+	struct fwnode_handle *ep = NULL;
+	struct v4l2_fwnode_link link;
+	struct media_entity *local = entity->entity;
+	struct media_entity *remote;
+	struct media_pad *local_pad;
+	struct media_pad *remote_pad;
+	u32 link_flags = MEDIA_LNK_FL_ENABLED;
+	int ret = 0;
+
+	dev_dbg(vi->dev, "creating links for entity %s\n", local->name);
+
+	while (1) {
+		ep = fwnode_graph_get_next_endpoint(entity->asd.match.fwnode,
+						    ep);
+		if (!ep)
+			break;
+
+		ret = v4l2_fwnode_parse_link(ep, &link);
+		if (ret < 0) {
+			dev_err(vi->dev, "failed to parse link for %pOF: %d\n",
+				to_of_node(ep), ret);
+			continue;
+		}
+
+		if (link.local_port >= local->num_pads) {
+			dev_err(vi->dev, "invalid port number %u on %pOF\n",
+				link.local_port, to_of_node(link.local_node));
+			v4l2_fwnode_put_link(&link);
+			ret = -EINVAL;
+			break;
+		}
+
+		local_pad = &local->pads[link.local_port];
+		/* Remote node is vi node. So use channel video entity and pad
+		 * as remote/sink.
+		 */
+		if (link.remote_node == of_fwnode_handle(vi->dev->of_node)) {
+			remote = &chan->video.entity;
+			remote_pad = &chan->pad;
+			goto create_link;
+		}
+
+		/*
+		 * Skip sink ports, they will be processed from the other end
+		 * of the link.
+		 */
+		if (local_pad->flags & MEDIA_PAD_FL_SINK) {
+			dev_dbg(vi->dev, "skipping sink port %pOF:%u\n",
+				to_of_node(link.local_node), link.local_port);
+			v4l2_fwnode_put_link(&link);
+			continue;
+		}
+
+		/* find the remote entity from notifier list */
+		ent = tegra_vi_graph_find_entity(chan, link.remote_node);
+		if (!ent) {
+			dev_err(vi->dev, "no entity found for %pOF\n",
+				to_of_node(link.remote_node));
+			v4l2_fwnode_put_link(&link);
+			ret = -ENODEV;
+			break;
+		}
+
+		remote = ent->entity;
+		if (link.remote_port >= remote->num_pads) {
+			dev_err(vi->dev, "invalid port number %u on %pOF\n",
+				link.remote_port,
+				to_of_node(link.remote_node));
+			v4l2_fwnode_put_link(&link);
+			ret = -EINVAL;
+			break;
+		}
+
+		remote_pad = &remote->pads[link.remote_port];
+
+create_link:
+		dev_dbg(vi->dev, "creating %s:%u -> %s:%u link\n",
+			local->name, local_pad->index,
+			remote->name, remote_pad->index);
+
+		ret = media_create_pad_link(local, local_pad->index,
+					    remote, remote_pad->index,
+					    link_flags);
+		v4l2_fwnode_put_link(&link);
+		if (ret < 0) {
+			dev_err(vi->dev,
+				"failed to create %s:%u -> %s:%u link: %d\n",
+				local->name, local_pad->index,
+				remote->name, remote_pad->index, ret);
+			break;
+		}
+	}
+
+	fwnode_handle_put(ep);
+	return ret;
+}
+
+static int tegra_vi_graph_notify_complete(struct v4l2_async_notifier *notifier)
+{
+	struct tegra_vi_graph_entity *entity;
+	struct v4l2_async_subdev *asd;
+	struct v4l2_subdev *subdev;
+	struct tegra_vi_channel *chan;
+	struct tegra_vi *vi;
+	int ret;
+
+	chan = container_of(notifier, struct tegra_vi_channel, notifier);
+	vi = chan->vi;
+
+	dev_dbg(vi->dev, "notify complete, all subdevs registered\n");
+
+	/*
+	 * Video device node should be created at the end of all the device
+	 * related initialization/setup.
+	 * Current video_register_device() does both initialize and register
+	 * video device in same API.
+	 *
+	 * TODO: Update v4l2-dev driver to split initialize and register into
+	 * separate APIs and then update Tegra video driver to do video device
+	 * initialize followed by all video device related setup and then
+	 * register the video device.
+	 */
+	ret = video_register_device(&chan->video, VFL_TYPE_VIDEO, -1);
+	if (ret < 0) {
+		dev_err(vi->dev,
+			"failed to register video device: %d\n", ret);
+		goto unregister_video;
+	}
+
+	/* create links between the entities */
+	list_for_each_entry(asd, &chan->notifier.asd_list, asd_list) {
+		entity = to_tegra_vi_graph_entity(asd);
+		ret = tegra_vi_graph_build(chan, entity);
+		if (ret < 0)
+			goto unregister_video;
+	}
+
+	ret = tegra_channel_setup_ctrl_handler(chan);
+	if (ret < 0) {
+		dev_err(vi->dev,
+			"failed to setup channel controls: %d\n", ret);
+		goto unregister_video;
+	}
+
+	ret = vi_fmts_bitmap_init(chan);
+	if (ret < 0) {
+		dev_err(vi->dev,
+			"failed to initialize formats bitmap: %d\n", ret);
+		goto unregister_video;
+	}
+
+	subdev = tegra_channel_get_remote_csi_subdev(chan);
+	if (!subdev) {
+		ret = -ENODEV;
+		dev_err(vi->dev,
+			"failed to get remote csi subdev: %d\n", ret);
+		goto unregister_video;
+	}
+
+	v4l2_set_subdev_hostdata(subdev, chan);
+
+	return 0;
+
+unregister_video:
+	video_unregister_device(&chan->video);
+	return ret;
+}
+
+static int tegra_vi_graph_notify_bound(struct v4l2_async_notifier *notifier,
+				       struct v4l2_subdev *subdev,
+				       struct v4l2_async_subdev *asd)
+{
+	struct tegra_vi_graph_entity *entity;
+	struct tegra_vi *vi;
+	struct tegra_vi_channel *chan;
+
+	chan = container_of(notifier, struct tegra_vi_channel, notifier);
+	vi = chan->vi;
+
+	/*
+	 * Locate the entity corresponding to the bound subdev and store the
+	 * subdev pointer.
+	 */
+	entity = tegra_vi_graph_find_entity(chan, subdev->fwnode);
+	if (!entity) {
+		dev_err(vi->dev, "no entity for subdev %s\n", subdev->name);
+		return -EINVAL;
+	}
+
+	if (entity->subdev) {
+		dev_err(vi->dev, "duplicate subdev for node %pOF\n",
+			to_of_node(entity->asd.match.fwnode));
+		return -EINVAL;
+	}
+
+	dev_dbg(vi->dev, "subdev %s bound\n", subdev->name);
+	entity->entity = &subdev->entity;
+	entity->subdev = subdev;
+
+	return 0;
+}
+
+static const struct v4l2_async_notifier_operations tegra_vi_async_ops = {
+	.bound = tegra_vi_graph_notify_bound,
+	.complete = tegra_vi_graph_notify_complete,
+};
+
+static int tegra_vi_graph_parse_one(struct tegra_vi_channel *chan,
+				    struct fwnode_handle *fwnode)
+{
+	struct tegra_vi *vi = chan->vi;
+	struct fwnode_handle *ep = NULL;
+	struct fwnode_handle *remote = NULL;
+	struct v4l2_async_subdev *asd;
+	struct device_node *node = NULL;
+	int ret;
+
+	dev_dbg(vi->dev, "parsing node %pOF\n", to_of_node(fwnode));
+
+	/* parse all the remote entities and put them into the list */
+	for_each_endpoint_of_node(to_of_node(fwnode), node) {
+		ep = of_fwnode_handle(node);
+		remote = fwnode_graph_get_remote_port_parent(ep);
+		if (!remote) {
+			dev_err(vi->dev,
+				"remote device at %pOF not found\n", node);
+			ret = -EINVAL;
+			goto cleanup;
+		}
+
+		/* skip entities that are already processed */
+		if (remote == dev_fwnode(vi->dev) ||
+		    tegra_vi_graph_find_entity(chan, remote)) {
+			fwnode_handle_put(remote);
+			continue;
+		}
+
+		asd = v4l2_async_notifier_add_fwnode_subdev(&chan->notifier,
+				remote, sizeof(struct tegra_vi_graph_entity));
+		if (IS_ERR(asd)) {
+			ret = PTR_ERR(asd);
+			dev_err(vi->dev,
+				"failed to add subdev to notifier: %d\n", ret);
+			fwnode_handle_put(remote);
+			goto cleanup;
+		}
+
+		ret = tegra_vi_graph_parse_one(chan, remote);
+		if (ret < 0) {
+			fwnode_handle_put(remote);
+			goto cleanup;
+		}
+
+		fwnode_handle_put(remote);
+	}
+
+	return 0;
+
+cleanup:
+	dev_err(vi->dev, "failed parsing the graph: %d\n", ret);
+	v4l2_async_notifier_cleanup(&chan->notifier);
+	of_node_put(node);
+	return ret;
+}
+
+static int tegra_vi_graph_init(struct tegra_vi *vi)
+{
+	struct tegra_video_device *vid = dev_get_drvdata(vi->client.host);
+	struct tegra_vi_channel *chan;
+	struct fwnode_handle *fwnode = dev_fwnode(vi->dev);
+	int ret;
+	struct fwnode_handle *remote = NULL;
+
+	/*
+	 * Walk the links to parse the full graph. Each channel will have
+	 * one endpoint of the composite node. Start by parsing the
+	 * composite node and parse the remote entities in turn.
+	 * Each channel will register v4l2 async notifier to make the graph
+	 * independent between the channels so we can the current channel
+	 * in case of something wrong during graph parsing and continue with
+	 * next channels.
+	 */
+	list_for_each_entry(chan, &vi->vi_chans, list) {
+		remote = fwnode_graph_get_remote_node(fwnode, chan->portno, 0);
+		if (!remote)
+			continue;
+
+		ret = tegra_vi_graph_parse_one(chan, remote);
+		fwnode_handle_put(remote);
+		if (ret < 0 || list_empty(&chan->notifier.asd_list))
+			continue;
+
+		chan->notifier.ops = &tegra_vi_async_ops;
+		ret = v4l2_async_notifier_register(&vid->v4l2_dev,
+						   &chan->notifier);
+		if (ret < 0) {
+			dev_err(vi->dev,
+				"failed to register channel %d notifier: %d\n",
+				chan->portno, ret);
+			v4l2_async_notifier_cleanup(&chan->notifier);
+		}
+	}
+
+	return 0;
+}
+
+static void tegra_vi_graph_cleanup(struct tegra_vi *vi)
+{
+	struct tegra_vi_channel *chan;
+
+	list_for_each_entry(chan, &vi->vi_chans, list) {
+		vb2_video_unregister_device(&chan->video);
+		v4l2_async_notifier_unregister(&chan->notifier);
+		v4l2_async_notifier_cleanup(&chan->notifier);
+	}
+}
+
 static int tegra_vi_init(struct host1x_client *client)
 {
 	struct tegra_video_device *vid = dev_get_drvdata(client->host);
@@ -922,13 +1484,14 @@ static int tegra_vi_init(struct host1x_client *client)
 
 	INIT_LIST_HEAD(&vi->vi_chans);
 
-	if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) {
+	if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
 		ret = tegra_vi_tpg_channels_alloc(vi);
-		if (ret < 0) {
-			dev_err(vi->dev,
-				"failed to allocate tpg channels: %d\n", ret);
-			goto free_chans;
-		}
+	else
+		ret = tegra_vi_channels_alloc(vi);
+	if (ret < 0) {
+		dev_err(vi->dev,
+			"failed to allocate vi channels: %d\n", ret);
+		goto free_chans;
 	}
 
 	ret = tegra_vi_channels_init(vi);
@@ -937,6 +1500,12 @@ static int tegra_vi_init(struct host1x_client *client)
 
 	vid->vi = vi;
 
+	if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) {
+		ret = tegra_vi_graph_init(vi);
+		if (ret < 0)
+			goto free_chans;
+	}
+
 	return 0;
 
 free_chans:
@@ -950,6 +1519,8 @@ static int tegra_vi_init(struct host1x_client *client)
 
 static int tegra_vi_exit(struct host1x_client *client)
 {
+	struct tegra_vi *vi = host1x_client_to_vi(client);
+
 	/*
 	 * Do not cleanup the channels here as application might still be
 	 * holding video device nodes. Channels cleanup will happen during
@@ -957,6 +1528,9 @@ static int tegra_vi_exit(struct host1x_client *client)
 	 * device nodes are released.
 	 */
 
+	if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
+		tegra_vi_graph_cleanup(vi);
+
 	return 0;
 }
 
diff --git a/drivers/staging/media/tegra-video/vi.h b/drivers/staging/media/tegra-video/vi.h
index 6272c9a..7d6b7a6 100644
--- a/drivers/staging/media/tegra-video/vi.h
+++ b/drivers/staging/media/tegra-video/vi.h
@@ -14,6 +14,7 @@
 #include <linux/wait.h>
 
 #include <media/media-entity.h>
+#include <media/v4l2-async.h>
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-dev.h>
@@ -93,6 +94,19 @@ struct tegra_vi {
 };
 
 /**
+ * struct tegra_vi_graph_entity - Entity in the video graph
+ *
+ * @asd: subdev asynchronous registration information
+ * @entity: media entity from the corresponding V4L2 subdev
+ * @subdev: V4L2 subdev
+ */
+struct tegra_vi_graph_entity {
+	struct v4l2_async_subdev asd;
+	struct media_entity *entity;
+	struct v4l2_subdev *subdev;
+};
+
+/**
  * struct tegra_vi_channel - Tegra video channel
  *
  * @list: list head for this entry
@@ -138,10 +152,13 @@ struct tegra_vi {
  * @done_lock: protects the capture done queue list
  *
  * @portno: VI channel port number
+ * @of_node: device node of VI channel
  *
  * @ctrl_handler: V4L2 control handler of this video channel
+ * @fmts_bitmap: a bitmap for supported formats matching v4l2 subdev formats
  * @tpg_fmts_bitmap: a bitmap for supported TPG formats
  * @pg_mode: test pattern generator mode (disabled/direct/patch)
+ * @notifier: V4L2 asynchronous subdevs notifier
  */
 struct tegra_vi_channel {
 	struct list_head list;
@@ -174,10 +191,14 @@ struct tegra_vi_channel {
 	spinlock_t done_lock;
 
 	unsigned char portno;
+	struct device_node *of_node;
 
 	struct v4l2_ctrl_handler ctrl_handler;
+	DECLARE_BITMAP(fmts_bitmap, MAX_FORMAT_NUM);
 	DECLARE_BITMAP(tpg_fmts_bitmap, MAX_FORMAT_NUM);
 	enum tegra_vi_pg_mode pg_mode;
+
+	struct v4l2_async_notifier notifier;
 };
 
 /**
@@ -249,7 +270,9 @@ extern const struct tegra_vi_soc tegra210_vi_soc;
 #endif
 
 struct v4l2_subdev *
-tegra_channel_get_remote_subdev(struct tegra_vi_channel *chan);
+tegra_channel_get_remote_csi_subdev(struct tegra_vi_channel *chan);
+struct v4l2_subdev *
+tegra_channel_get_remote_source_subdev(struct tegra_vi_channel *chan);
 int tegra_channel_set_stream(struct tegra_vi_channel *chan, bool on);
 void tegra_channel_release_buffers(struct tegra_vi_channel *chan,
 				   enum vb2_buffer_state state);
-- 
2.7.4

[RFC PATCH v4 11/14] media: tegra-video: Add support for selection ioctl ops

[Sowjanya Komatineni]

This patch adds selection v4l2 ioctl operations to allow configuring
a selection rectangle in the sensor through the Tegra video device
node.

Some sensor drivers supporting crop uses try_crop rectangle from
v4l2_subdev_pad_config during try format for computing binning.

So with selection ops support, this patch also updates try format
to use try crop rectangle either from subdev frame size enumeration
or from subdev crop boundary.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 drivers/staging/media/tegra-video/vi.c | 106 +++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)

diff --git a/drivers/staging/media/tegra-video/vi.c b/drivers/staging/media/tegra-video/vi.c
index f7dbea2..fc43629 100644
--- a/drivers/staging/media/tegra-video/vi.c
+++ b/drivers/staging/media/tegra-video/vi.c
@@ -437,6 +437,13 @@ static int __tegra_channel_try_format(struct tegra_vi_channel *chan,
 	struct v4l2_subdev *subdev;
 	struct v4l2_subdev_format fmt;
 	struct v4l2_subdev_pad_config *pad_cfg;
+	struct v4l2_subdev_frame_size_enum fse = {
+		.which = V4L2_SUBDEV_FORMAT_TRY,
+	};
+	struct v4l2_subdev_selection sdsel = {
+		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
+		.target = V4L2_SEL_TGT_CROP_BOUNDS,
+	};
 	int ret;
 
 	subdev = tegra_channel_get_remote_source_subdev(chan);
@@ -462,6 +469,24 @@ static int __tegra_channel_try_format(struct tegra_vi_channel *chan,
 	fmt.which = V4L2_SUBDEV_FORMAT_TRY;
 	fmt.pad = 0;
 	v4l2_fill_mbus_format(&fmt.format, pix, fmtinfo->code);
+
+	/*
+	 * Attempt to obtain the format size from subdev.
+	 * If not available, try to get crop boundary from subdev.
+	 */
+	fse.code = fmtinfo->code;
+	ret = v4l2_subdev_call(subdev, pad, enum_frame_size, pad_cfg, &fse);
+	if (ret) {
+		ret = v4l2_subdev_call(subdev, pad, get_selection, NULL, &sdsel);
+		if (ret)
+			return -EINVAL;
+		pad_cfg->try_crop.width = sdsel.r.width;
+		pad_cfg->try_crop.height = sdsel.r.height;
+	} else {
+		pad_cfg->try_crop.width = fse.max_width;
+		pad_cfg->try_crop.height = fse.max_height;
+	}
+
 	ret = v4l2_subdev_call(subdev, pad, set_fmt, pad_cfg, &fmt);
 	if (ret < 0)
 		return ret;
@@ -551,6 +576,85 @@ static int tegra_channel_set_subdev_active_fmt(struct tegra_vi_channel *chan)
 	return 0;
 }
 
+static int tegra_channel_g_selection(struct file *file, void *priv,
+				     struct v4l2_selection *sel)
+{
+	struct tegra_vi_channel *chan = video_drvdata(file);
+	struct v4l2_subdev *subdev;
+	struct v4l2_subdev_format fmt = {
+		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
+	};
+	struct v4l2_subdev_selection sdsel = {
+		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
+		.target = sel->target,
+	};
+	int ret;
+
+	subdev = tegra_channel_get_remote_source_subdev(chan);
+	if (!v4l2_subdev_has_op(subdev, pad, get_selection))
+		return -ENOTTY;
+
+	if (sel->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+	/*
+	 * Try the get selection operation and fallback to get format if not
+	 * implemented.
+	 */
+	ret = v4l2_subdev_call(subdev, pad, get_selection, NULL, &sdsel);
+	if (!ret)
+		sel->r = sdsel.r;
+	if (ret != -ENOIOCTLCMD)
+		return ret;
+
+	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
+	if (ret < 0)
+		return ret;
+
+	sel->r.left = 0;
+	sel->r.top = 0;
+	sel->r.width = fmt.format.width;
+	sel->r.height = fmt.format.height;
+
+	return 0;
+}
+
+static int tegra_channel_s_selection(struct file *file, void *fh,
+				     struct v4l2_selection *sel)
+{
+	struct tegra_vi_channel *chan = video_drvdata(file);
+	struct v4l2_subdev *subdev;
+	int ret;
+	struct v4l2_subdev_selection sdsel = {
+		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
+		.target = sel->target,
+		.flags = sel->flags,
+		.r = sel->r,
+	};
+
+	subdev = tegra_channel_get_remote_source_subdev(chan);
+	if (!v4l2_subdev_has_op(subdev, pad, set_selection))
+		return -ENOTTY;
+
+	if (sel->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	if (vb2_is_busy(&chan->queue))
+		return -EBUSY;
+
+	ret = v4l2_subdev_call(subdev, pad, set_selection, NULL, &sdsel);
+	if (!ret) {
+		sel->r = sdsel.r;
+		/*
+		 * Subdev active format resolution may have changed during
+		 * set selection operation. So, update channel format to
+		 * the sub-device active format.
+		 */
+		return tegra_channel_set_subdev_active_fmt(chan);
+	}
+
+	return ret;
+}
+
 static int tegra_channel_enum_input(struct file *file, void *fh,
 				    struct v4l2_input *inp)
 {
@@ -608,6 +712,8 @@ static const struct v4l2_ioctl_ops tegra_channel_ioctl_ops = {
 	.vidioc_streamoff		= vb2_ioctl_streamoff,
 	.vidioc_subscribe_event		= v4l2_ctrl_subscribe_event,
 	.vidioc_unsubscribe_event	= v4l2_event_unsubscribe,
+	.vidioc_g_selection		= tegra_channel_g_selection,
+	.vidioc_s_selection		= tegra_channel_s_selection,
 };
 
 /*
-- 
2.7.4

[RFC PATCH v4 12/14] gpu: host1x: mipi: Keep MIPI clock enabled till calibration is done

[Sowjanya Komatineni]

With the split of MIPI calibration into tegra_mipi_calibrate() and
tegra_mipi_wait(), MIPI clock is not kept enabled till the calibration
is done.

So, this patch skips disabling MIPI clock after triggering start of
calibration and disables it only after waiting for done status from
the calibration logic.

This patch renames tegra_mipi_calibrate() as tegra_mipi_start_calibration()
and tegra_mipi_wait() as tegra_mipi_finish_calibration() to be inline
with their usage.

As MIPI clock is left enabled and in case of any failures with CSI input
streaming tegra_mipi_finish_calibration() will not get invoked.
So added new API tegra_mipi_cancel_calibrate() which disables MIPI clock
and consumer drivers can call this in such cases.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 drivers/gpu/drm/tegra/dsi.c |  4 ++--
 drivers/gpu/host1x/mipi.c   | 19 ++++++++++---------
 include/linux/host1x.h      |  5 +++--
 3 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c
index 3820e8d..4d54c13 100644
--- a/drivers/gpu/drm/tegra/dsi.c
+++ b/drivers/gpu/drm/tegra/dsi.c
@@ -694,11 +694,11 @@ static int tegra_dsi_pad_calibrate(struct tegra_dsi *dsi)
 		DSI_PAD_PREEMP_PD(0x03) | DSI_PAD_PREEMP_PU(0x3);
 	tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_3);
 
-	err = tegra_mipi_calibrate(dsi->mipi);
+	err = tegra_mipi_start_calibrate(dsi->mipi);
 	if (err < 0)
 		return err;
 
-	return tegra_mipi_wait(dsi->mipi);
+	return tegra_mipi_finish_calibrate(dsi->mipi);
 }
 
 static void tegra_dsi_set_timeout(struct tegra_dsi *dsi, unsigned long bclk,
diff --git a/drivers/gpu/host1x/mipi.c b/drivers/gpu/host1x/mipi.c
index e606464..f06c5cd 100644
--- a/drivers/gpu/host1x/mipi.c
+++ b/drivers/gpu/host1x/mipi.c
@@ -293,17 +293,19 @@ int tegra_mipi_disable(struct tegra_mipi_device *dev)
 }
 EXPORT_SYMBOL(tegra_mipi_disable);
 
-int tegra_mipi_wait(struct tegra_mipi_device *device)
+void tegra_mipi_cancel_calibrate(struct tegra_mipi_device *device)
+{
+	clk_disable(device->mipi->clk);
+}
+EXPORT_SYMBOL(tegra_mipi_cancel_calibrate);
+
+int tegra_mipi_finish_calibrate(struct tegra_mipi_device *device)
 {
 	struct tegra_mipi *mipi = device->mipi;
 	void __iomem *status_reg = mipi->regs + (MIPI_CAL_STATUS << 2);
 	u32 value;
 	int err;
 
-	err = clk_enable(device->mipi->clk);
-	if (err < 0)
-		return err;
-
 	mutex_lock(&device->mipi->lock);
 
 	err = readl_relaxed_poll_timeout(status_reg, value,
@@ -315,9 +317,9 @@ int tegra_mipi_wait(struct tegra_mipi_device *device)
 
 	return err;
 }
-EXPORT_SYMBOL(tegra_mipi_wait);
+EXPORT_SYMBOL(tegra_mipi_finish_calibrate);
 
-int tegra_mipi_calibrate(struct tegra_mipi_device *device)
+int tegra_mipi_start_calibrate(struct tegra_mipi_device *device)
 {
 	const struct tegra_mipi_soc *soc = device->mipi->soc;
 	unsigned int i;
@@ -382,11 +384,10 @@ int tegra_mipi_calibrate(struct tegra_mipi_device *device)
 	tegra_mipi_writel(device->mipi, value, MIPI_CAL_CTRL);
 
 	mutex_unlock(&device->mipi->lock);
-	clk_disable(device->mipi->clk);
 
 	return 0;
 }
-EXPORT_SYMBOL(tegra_mipi_calibrate);
+EXPORT_SYMBOL(tegra_mipi_start_calibrate);
 
 static const struct tegra_mipi_pad tegra114_mipi_pads[] = {
 	{ .data = MIPI_CAL_CONFIG_CSIA },
diff --git a/include/linux/host1x.h b/include/linux/host1x.h
index 20c885d..0065763 100644
--- a/include/linux/host1x.h
+++ b/include/linux/host1x.h
@@ -333,7 +333,8 @@ struct tegra_mipi_device *tegra_mipi_request(struct device *device,
 void tegra_mipi_free(struct tegra_mipi_device *device);
 int tegra_mipi_enable(struct tegra_mipi_device *device);
 int tegra_mipi_disable(struct tegra_mipi_device *device);
-int tegra_mipi_calibrate(struct tegra_mipi_device *device);
-int tegra_mipi_wait(struct tegra_mipi_device *device);
+int tegra_mipi_start_calibrate(struct tegra_mipi_device *device);
+int tegra_mipi_finish_calibrate(struct tegra_mipi_device *device);
+void tegra_mipi_cancel_calibrate(struct tegra_mipi_device *device);
 
 #endif
-- 
2.7.4

[RFC PATCH v4 13/14] media: tegra-video: Add CSI MIPI pads calibration

[Sowjanya Komatineni]

CSI MIPI pads need to be enabled and calibrated for capturing from
the external sensor or transmitter.

MIPI CAL unit calibrates MIPI pads pull-up, pull-down and termination
impedances. Calibration is done by co-work of MIPI BIAS pad and MIPI
CAL control unit.

Triggering calibration start can happen any time after MIPI pads are
enabled but calibration results will be latched and applied to MIPI
pads by MIPI CAL unit only when the link is in LP11 state and then
calibration status register gets updated.

This patch enables CSI MIPI pads and calibrates them during streaming.

Tegra CSI receiver is able to catch the very first clock transition.
So, CSI receiver is always enabled prior to sensor streaming and
trigger of calibration start is done during CSI subdev streaming and
status of calibration is verified after sensor stream on.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 drivers/staging/media/tegra-video/csi.c | 55 +++++++++++++++++++++++++++++++--
 drivers/staging/media/tegra-video/csi.h |  2 ++
 drivers/staging/media/tegra-video/vi.c  | 25 ++++++++++++++-
 3 files changed, 78 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/media/tegra-video/csi.c b/drivers/staging/media/tegra-video/csi.c
index c21dd09..bdaf4b6 100644
--- a/drivers/staging/media/tegra-video/csi.c
+++ b/drivers/staging/media/tegra-video/csi.c
@@ -252,15 +252,51 @@ static int tegra_csi_s_stream(struct v4l2_subdev *subdev, int enable)
 			return ret;
 		}
 
+		if (csi_chan->mipi) {
+			ret = tegra_mipi_enable(csi_chan->mipi);
+			if (ret < 0) {
+				dev_err(csi->dev,
+					"failed to enable MIPI pads: %d\n",
+					ret);
+				goto rpm_put;
+			}
+
+			/*
+			 * CSI MIPI pads PULLUP, PULLDN and TERM impedances
+			 * need to be calibrated after power on.
+			 * So, trigger the calibration start here and results
+			 * will be latched and applied to the pads when link is
+			 * in LP11 state during start of sensor streaming.
+			 */
+			ret = tegra_mipi_start_calibrate(csi_chan->mipi);
+			if (ret < 0) {
+				dev_err(csi->dev,
+					"failed to start MIPI calibrate: %d\n",
+					ret);
+				goto disable_mipi;
+			}
+		}
+
 		ret = csi->ops->csi_start_streaming(csi_chan);
-		if (ret < 0)
-			goto rpm_put;
+		if (ret < 0) {
+			if (csi_chan->mipi)
+				tegra_mipi_cancel_calibrate(csi_chan->mipi);
+			goto disable_mipi;
+		}
 
 		return 0;
 	}
 
 	csi->ops->csi_stop_streaming(csi_chan);
 
+disable_mipi:
+	if (csi_chan->mipi) {
+		ret = tegra_mipi_disable(csi_chan->mipi);
+		if (ret < 0)
+			dev_err(csi->dev,
+				"failed to disable MIPI pads: %d\n", ret);
+	}
+
 rpm_put:
 	pm_runtime_put(csi->dev);
 	return ret;
@@ -294,6 +330,7 @@ static int tegra_csi_channel_alloc(struct tegra_csi *csi,
 				   unsigned int num_pads)
 {
 	struct tegra_csi_channel *chan;
+	int ret = 0;
 
 	chan = kzalloc(sizeof(*chan), GFP_KERNEL);
 	if (!chan)
@@ -312,7 +349,16 @@ static int tegra_csi_channel_alloc(struct tegra_csi *csi,
 		chan->pads[0].flags = MEDIA_PAD_FL_SOURCE;
 	}
 
-	return 0;
+	if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
+		return 0;
+
+	chan->mipi = tegra_mipi_request(csi->dev, node);
+	if (IS_ERR(chan->mipi)) {
+		ret = PTR_ERR(chan->mipi);
+		dev_err(csi->dev, "failed to get mipi device: %d\n", ret);
+	}
+
+	return ret;
 }
 
 static int tegra_csi_tpg_channels_alloc(struct tegra_csi *csi)
@@ -475,6 +521,9 @@ static void tegra_csi_channels_cleanup(struct tegra_csi *csi)
 	struct tegra_csi_channel *chan, *tmp;
 
 	list_for_each_entry_safe(chan, tmp, &csi->csi_chans, list) {
+		if (chan->mipi)
+			tegra_mipi_free(chan->mipi);
+
 		subdev = &chan->subdev;
 		if (subdev->dev) {
 			if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
diff --git a/drivers/staging/media/tegra-video/csi.h b/drivers/staging/media/tegra-video/csi.h
index 78a5110..0d50fc3 100644
--- a/drivers/staging/media/tegra-video/csi.h
+++ b/drivers/staging/media/tegra-video/csi.h
@@ -50,6 +50,7 @@ struct tegra_csi;
  * @framerate: active framerate for TPG
  * @h_blank: horizontal blanking for TPG active format
  * @v_blank: vertical blanking for TPG active format
+ * @mipi: mipi device for corresponding csi channel pads
  */
 struct tegra_csi_channel {
 	struct list_head list;
@@ -65,6 +66,7 @@ struct tegra_csi_channel {
 	unsigned int framerate;
 	unsigned int h_blank;
 	unsigned int v_blank;
+	struct tegra_mipi_device *mipi;
 };
 
 /**
diff --git a/drivers/staging/media/tegra-video/vi.c b/drivers/staging/media/tegra-video/vi.c
index fc43629..129790c 100644
--- a/drivers/staging/media/tegra-video/vi.c
+++ b/drivers/staging/media/tegra-video/vi.c
@@ -191,10 +191,12 @@ tegra_channel_get_remote_source_subdev(struct tegra_vi_channel *chan)
 int tegra_channel_set_stream(struct tegra_vi_channel *chan, bool on)
 {
 	struct v4l2_subdev *subdev, *csi_subdev, *src_subdev;
+	struct tegra_csi_channel *csi_chan;
 	int ret;
 
 	csi_subdev = tegra_channel_get_remote_csi_subdev(chan);
 	src_subdev = tegra_channel_get_remote_source_subdev(chan);
+	csi_chan = v4l2_get_subdevdata(csi_subdev);
 	/*
 	 * Tegra CSI receiver can detect the first LP to HS transition.
 	 * So, start the CSI stream-on prior to sensor stream-on and
@@ -208,10 +210,31 @@ int tegra_channel_set_stream(struct tegra_vi_channel *chan, bool on)
 	if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
 		return 0;
 
+	/*
+	 * TRM has incorrectly documented to wait for done status from
+	 * calibration logic after CSI interface power on.
+	 * As per the design, calibration results are latched and applied
+	 * to the pads only when the link is in LP11 state which will happen
+	 * during the sensor stream-on.
+	 * CSI subdev stream-on triggers start of MIPI pads calibration.
+	 * Wait for calibration to finish here after sensor subdev stream-on
+	 * and in case of sensor stream-on failure, cancel the calibration.
+	 */
 	subdev = on ? src_subdev : csi_subdev;
 	ret = v4l2_subdev_call(subdev, video, s_stream, on);
-	if (ret < 0 && ret != -ENOIOCTLCMD)
+	if (ret < 0 && ret != -ENOIOCTLCMD) {
+		if (on && csi_chan->mipi)
+			tegra_mipi_cancel_calibrate(csi_chan->mipi);
 		return ret;
+	}
+
+	if (on && csi_chan->mipi) {
+		ret = tegra_mipi_finish_calibrate(csi_chan->mipi);
+		if (ret < 0)
+			dev_err(csi_chan->csi->dev,
+				"MIPI calibration failed: %d\n", ret);
+		return ret;
+	}
 
 	return 0;
 }
-- 
2.7.4

[RFC PATCH v4 14/14] media: tegra-video: Compute settle times based on the clock rate

[Sowjanya Komatineni]

Settle time determines the number of cil clock cyles to wait after
LP00 when moving from LP to HS.

This patch computes T-CLK-SETTLE and T-HS-SETTLE times based on cil
clock rate and pixel rate from the sensor and programs them during
streaming.

T-CLK-SETTLE time is the interval during which receiver will ignore
any HS transitions on clock lane starting from the beginning of
T-CLK-PREPARE.

T-HS-SETTLE time is the interval during which recevier will ignore
any HS transitions on data lane starting from the beginning of
T-HS-PREPARE.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 drivers/staging/media/tegra-video/csi.c      | 55 ++++++++++++++++++++++++++++
 drivers/staging/media/tegra-video/csi.h      |  5 +++
 drivers/staging/media/tegra-video/tegra210.c | 17 ++++++++-
 3 files changed, 75 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/media/tegra-video/csi.c b/drivers/staging/media/tegra-video/csi.c
index bdaf4b6..4d38e0e 100644
--- a/drivers/staging/media/tegra-video/csi.c
+++ b/drivers/staging/media/tegra-video/csi.c
@@ -19,6 +19,8 @@
 #include "csi.h"
 #include "video.h"
 
+#define MHZ			1000000
+
 static inline struct tegra_csi *
 host1x_client_to_csi(struct host1x_client *client)
 {
@@ -235,6 +237,59 @@ static int tegra_csi_g_frame_interval(struct v4l2_subdev *subdev,
 	return 0;
 }
 
+static unsigned int csi_get_pixel_rate(struct tegra_csi_channel *csi_chan)
+{
+	struct tegra_vi_channel *chan;
+	struct v4l2_subdev *src_subdev;
+	struct v4l2_ctrl *ctrl;
+
+	chan = v4l2_get_subdev_hostdata(&csi_chan->subdev);
+	src_subdev = tegra_channel_get_remote_source_subdev(chan);
+	ctrl = v4l2_ctrl_find(src_subdev->ctrl_handler, V4L2_CID_PIXEL_RATE);
+	if (ctrl)
+		return v4l2_ctrl_g_ctrl_int64(ctrl);
+
+	return 0;
+}
+
+void tegra_csi_calc_settle_time(struct tegra_csi_channel *csi_chan,
+				u8 *clk_settle_time,
+				u8 *ths_settle_time)
+{
+	struct tegra_csi *csi = csi_chan->csi;
+	unsigned int cil_clk_mhz;
+	unsigned int pix_clk_mhz;
+	int clk_idx = (csi_chan->csi_port_num >> 1) + 1;
+
+	cil_clk_mhz = clk_get_rate(csi->clks[clk_idx].clk) / MHZ;
+	pix_clk_mhz = csi_get_pixel_rate(csi_chan) / MHZ;
+
+	/*
+	 * CLK Settle time is the interval during which HS receiver should
+	 * ignore any clock lane HS transitions, starting from the beginning
+	 * of T-CLK-PREPARE.
+	 * Per DPHY specification, T-CLK-SETTLE should be between 95ns ~ 300ns
+	 *
+	 * 95ns < (clk-settle-programmed + 7) * lp clk period < 300ns
+	 * midpoint = 197.5 ns
+	 */
+	*clk_settle_time = ((95 + 300) * cil_clk_mhz - 14000) / 2000;
+
+	/*
+	 * THS Settle time is the interval during which HS receiver should
+	 * ignore any data lane HS transitions, starting from the beginning
+	 * of THS-PREPARE.
+	 *
+	 * Per DPHY specification, T-HS-SETTLE should be between 85ns + 6UI
+	 * and 145ns+10UI.
+	 * 85ns + 6UI < (Ths-settle-prog + 5) * lp_clk_period < 145ns + 10UI
+	 * midpoint = 115ns + 8UI
+	 */
+	if (pix_clk_mhz)
+		*ths_settle_time = (115 * cil_clk_mhz + 8000 * cil_clk_mhz
+				   / (2 * pix_clk_mhz) - 5000) / 1000;
+}
+
 static int tegra_csi_s_stream(struct v4l2_subdev *subdev, int enable)
 {
 	struct tegra_vi_channel *chan = v4l2_get_subdev_hostdata(subdev);
diff --git a/drivers/staging/media/tegra-video/csi.h b/drivers/staging/media/tegra-video/csi.h
index 0d50fc3..c65ff73 100644
--- a/drivers/staging/media/tegra-video/csi.h
+++ b/drivers/staging/media/tegra-video/csi.h
@@ -51,6 +51,7 @@ struct tegra_csi;
  * @h_blank: horizontal blanking for TPG active format
  * @v_blank: vertical blanking for TPG active format
  * @mipi: mipi device for corresponding csi channel pads
+ * @pixel_rate: active pixel rate from the sensor on this channel
  */
 struct tegra_csi_channel {
 	struct list_head list;
@@ -67,6 +68,7 @@ struct tegra_csi_channel {
 	unsigned int h_blank;
 	unsigned int v_blank;
 	struct tegra_mipi_device *mipi;
+	unsigned int pixel_rate;
 };
 
 /**
@@ -147,4 +149,7 @@ extern const struct tegra_csi_soc tegra210_csi_soc;
 #endif
 
 void tegra_csi_error_recover(struct v4l2_subdev *subdev);
+void tegra_csi_calc_settle_time(struct tegra_csi_channel *csi_chan,
+				u8 *clk_settle_time,
+				u8 *ths_settle_time);
 #endif
diff --git a/drivers/staging/media/tegra-video/tegra210.c b/drivers/staging/media/tegra-video/tegra210.c
index 253bf33..ac066c0 100644
--- a/drivers/staging/media/tegra-video/tegra210.c
+++ b/drivers/staging/media/tegra-video/tegra210.c
@@ -7,6 +7,7 @@
  * This source file contains Tegra210 supported video formats,
  * VI and CSI SoC specific data, operations and registers accessors.
  */
+#include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/clk/tegra.h>
 #include <linux/delay.h>
@@ -98,6 +99,8 @@
 #define   BRICK_CLOCK_B_4X				(0x2 << 16)
 #define TEGRA_CSI_CIL_PAD_CONFIG1                       0x004
 #define TEGRA_CSI_CIL_PHY_CONTROL                       0x008
+#define   CLK_SETTLE_MASK				GENMASK(13, 8)
+#define   THS_SETTLE_MASK				GENMASK(5, 0)
 #define TEGRA_CSI_CIL_INTERRUPT_MASK                    0x00c
 #define TEGRA_CSI_CIL_STATUS                            0x010
 #define TEGRA_CSI_CILX_STATUS                           0x014
@@ -770,8 +773,14 @@ static int tegra210_csi_start_streaming(struct tegra_csi_channel *csi_chan)
 {
 	struct tegra_csi *csi = csi_chan->csi;
 	unsigned int portno = csi_chan->csi_port_num;
+	u8 clk_settle_time = 0;
+	u8 ths_settle_time = 10;
 	u32 val;
 
+	if (!csi_chan->pg_mode)
+		tegra_csi_calc_settle_time(csi_chan, &clk_settle_time,
+					   &ths_settle_time);
+
 	csi_write(csi, portno, TEGRA_CSI_CLKEN_OVERRIDE, 0);
 
 	/* clean up status */
@@ -782,7 +791,9 @@ static int tegra210_csi_start_streaming(struct tegra_csi_channel *csi_chan)
 
 	/* CIL PHY registers setup */
 	cil_write(csi, portno, TEGRA_CSI_CIL_PAD_CONFIG0, 0x0);
-	cil_write(csi, portno, TEGRA_CSI_CIL_PHY_CONTROL, 0xa);
+	cil_write(csi, portno, TEGRA_CSI_CIL_PHY_CONTROL,
+		  FIELD_PREP(CLK_SETTLE_MASK, clk_settle_time) |
+		  FIELD_PREP(THS_SETTLE_MASK, ths_settle_time));
 
 	/*
 	 * The CSI unit provides for connection of up to six cameras in
@@ -801,7 +812,9 @@ static int tegra210_csi_start_streaming(struct tegra_csi_channel *csi_chan)
 			  BRICK_CLOCK_A_4X);
 		cil_write(csi, portno + 1, TEGRA_CSI_CIL_PAD_CONFIG0, 0x0);
 		cil_write(csi, portno + 1, TEGRA_CSI_CIL_INTERRUPT_MASK, 0x0);
-		cil_write(csi, portno + 1, TEGRA_CSI_CIL_PHY_CONTROL, 0xa);
+		cil_write(csi, portno + 1, TEGRA_CSI_CIL_PHY_CONTROL,
+			  FIELD_PREP(CLK_SETTLE_MASK, clk_settle_time) |
+			  FIELD_PREP(THS_SETTLE_MASK, ths_settle_time));
 		csi_write(csi, portno, TEGRA_CSI_PHY_CIL_COMMAND,
 			  CSI_A_PHY_CIL_ENABLE | CSI_B_PHY_CIL_ENABLE);
 	} else {
-- 
2.7.4

Re: [RFC PATCH v4 00/14] Support for Tegra video capture from external sensor

[Hans Verkuil]

Thierry, Dmitry,

I'm happy with this series from a media perspective. However, patches 1-5 fix
various i2c-tegra.c issues and patch 12 changes mipi calibration functions in
drivers/gpu that patch 13 relies on.

I think the i2c-tegra.c patches can be merged independently into the i2c
subsystem, but patch 12 needs to be merged with the media patches. So for patch
12 I need an Acked-by from Thierry.

I can also take the i2c-tegra patches if preferred, but there too I need Acks.
Dmitry, can you either take these i2c patches, or reply with Acks if you want
me to take it?

Regards,

	Hans


On 24/07/2020 01:50, Sowjanya Komatineni wrote:
> This series adds support for video capture from external camera sensor to
> Tegra video driver.
> 
> Jetson TX1 has camera expansion connector and supports custom camera module
> designed as per TX1 design specification.
> 
> This series also enables camera capture support for Jetson Nano which has
> Raspberry PI camera header.
> 
> This series is tested with IMX219 camera sensor.
> 
> This series include,
> 
> VI I2C related fixes
> - Camera sensor programming happens through VI I2C which is on host1x bus.
> - These patches includes device tree and I2C driver fixes for VI I2C.
> 
> Tegra video driver updates
> - TPG Vs Non-TPG based on Kconfig
> - Support for external sensor video capture based on device graph from DT.
> - Support for selection ioctl operations
> - Tegra MIPI CSI pads calibration
> - CSI T-CLK and T-HS settle time computation based on clock rates.
> 
> Host1x driver updates
> - Adds API to allow creating mipi device for specific device node.
> - Splits MIPI pads calibrate start and waiting for calibration to be done.
> 
> Device tree updates
> - Adds camera connector 2V8, 1V8, 1V2 regulator supplies to Jetson TX1 DT.
> - Enabled VI and CSI support in Jetson Nano DT.
> 
> 
> Delta between patch versions:
> [v4]:	Includes below fix based on v3 feedback
> 	- Patches are based on latest linux-next.
> 	- With split of tegra_mipi_calibrate() and tegra_mipi_wait(), mipi
> 	  clock is not left enabled till calibration done. This series adds
> 	  a patch to fix this by keeping clock enabled till calibration is
> 	  done.
> 
> 	Note:
> 	Patch-0010 has compilation dependency on
> 	https://patchwork.kernel.org/patch/11659521/
> 
> [v3]:	Includes v2 feedback
> 	- Uses separate helper function for retrieving remote csi subdevice
> 	  and source subdevice.
> 	- Added check for presence of subdevice ops set/get_selection
> 	- dropped vb2_queue_release from driver and using
> 	  vb2_video_unregister_device instead of video_unregister_device.
> 	- video device register should happen in the last after all video
> 	  device related setup is done in the driver. This is being addressed
> 	  in below RFC patch. Once proper implementation of this is available
> 	  will update Tegra video driver to use split APIs and do all setup
> 	  prior to device register. Added this as TODO in the driver.
> 	  https://www.spinics.net/lists/linux-media/msg172761.html
> 
> 	Note:
> 	Patch-0012 has compilation dependency on
> 	https://patchwork.kernel.org/patch/11659521/
> 
> 
> [v2]:	Includes below changes based on v1 feedback
> 	- dt-binding document and the driver update for device graph to use
> 	  separate ports for sink endpoint and source endpoint for csi.
> 	- Use data-lanes endpoint property for csi.
> 	- Update tegra_mipi_request() to take device node pointer argument
> 	  rather than adding extra API.
> 	- Remove checking for clk pointer before clk_disable.
> 
> 
> Sowjanya Komatineni (14):
>   i2c: tegra: Don't mark VI I2C as IRQ safe runtime PM
>   i2c: tegra: Remove NULL pointer check before
>     clk_enable/disable/prepare/unprepare
>   i2c: tegra: Fix the error path in tegra_i2c_runtime_resume
>   i2c: tegra: Fix runtime resume to re-init VI I2C
>   i2c: tegra: Avoid tegra_i2c_init_dma() for Tegra210 vi i2c
>   media: tegra-video: Fix channel format alignment
>   media: tegra-video: Enable TPG based on kernel config
>   media: tegra-video: Update format lookup to offset based
>   dt-bindings: tegra: Update VI and CSI bindings with port info
>   media: tegra-video: Add support for external sensor capture
>   media: tegra-video: Add support for selection ioctl ops
>   gpu: host1x: mipi: Keep MIPI clock enabled till calibration is done
>   media: tegra-video: Add CSI MIPI pads calibration
>   media: tegra-video: Compute settle times based on the clock rate
> 
>  .../display/tegra/nvidia,tegra20-host1x.txt        |  92 ++-
>  drivers/gpu/drm/tegra/dsi.c                        |   4 +-
>  drivers/gpu/host1x/mipi.c                          |  19 +-
>  drivers/i2c/busses/i2c-tegra.c                     | 101 +--
>  drivers/staging/media/tegra-video/Kconfig          |   7 +
>  drivers/staging/media/tegra-video/csi.c            | 258 ++++++-
>  drivers/staging/media/tegra-video/csi.h            |   8 +
>  drivers/staging/media/tegra-video/tegra210.c       |  25 +-
>  drivers/staging/media/tegra-video/vi.c             | 800 +++++++++++++++++++--
>  drivers/staging/media/tegra-video/vi.h             |  25 +-
>  drivers/staging/media/tegra-video/video.c          |  23 +-
>  include/linux/host1x.h                             |   5 +-
>  12 files changed, 1224 insertions(+), 143 deletions(-)
> 

Re: [RFC PATCH v4 00/14] Support for Tegra video capture from external sensor

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 376 bytes --]


> I can also take the i2c-tegra patches if preferred, but there too I need Acks.
> Dmitry, can you either take these i2c patches, or reply with Acks if you want
> me to take it?

There are some more patches for i2c-tegra pending, so I'd rather pick
them into my I2C tree once the Tegra maintainers acked them. I can
provide a immutable branch, though, if there is interest.


[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]

Re: [RFC PATCH v4 01/14] i2c: tegra: Don't mark VI I2C as IRQ safe runtime PM

[Dmitry Osipenko]

24.07.2020 02:50, Sowjanya Komatineni пишет:
> Tegra VI I2C is part of VE power domain and typically used for
> camera usecases.
> 
> VE power domain is not always on and is non-IRQ safe. So, IRQ safe
> device cannot be attached to a non-IRQ safe domain as it prevents
> powering off the PM domain and generic power domain driver will warn.
> 
> Current driver marks all I2C devices as IRQ safe and VI I2C device
> does not require IRQ safe as it will not be used for atomic transfers.
> 
> This patch has fix to make VI I2C as non-IRQ safe.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
> ---
>  drivers/i2c/busses/i2c-tegra.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
> index 1577296..3be1018 100644
> --- a/drivers/i2c/busses/i2c-tegra.c
> +++ b/drivers/i2c/busses/i2c-tegra.c
> @@ -1750,7 +1750,15 @@ static int tegra_i2c_probe(struct platform_device *pdev)
>  		goto unprepare_slow_clk;
>  	}
>  
> -	pm_runtime_irq_safe(&pdev->dev);
> +	/*
> +	 * VI I2C is in VE power domain which is not always on and not
> +	 * an IRQ safe. So, IRQ safe device can't be attached to a non-IRQ
> +	 * safe domain as it prevents powering off the PM domain.
> +	 * Also, VI I2C device don't need to use runtime IRQ safe as it will
> +	 * not be used for atomic transfers.
> +	 */
> +	if (!i2c_dev->is_vi)
> +		pm_runtime_irq_safe(&pdev->dev);
>  	pm_runtime_enable(&pdev->dev);
>  	if (!pm_runtime_enabled(&pdev->dev)) {
>  		ret = tegra_i2c_runtime_resume(&pdev->dev);
> 

Reviewed-by: Dmitry Osipenko <digetx@gmail.com>

Re: [RFC PATCH v4 03/14] i2c: tegra: Fix the error path in tegra_i2c_runtime_resume

[Dmitry Osipenko]

24.07.2020 02:51, Sowjanya Komatineni пишет:
> tegra_i2c_runtime_resume does not disable prior enabled clocks
> properly.
> 
> This patch fixes it.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
> ---
>  drivers/i2c/busses/i2c-tegra.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
> index c91307b9..7b93c45 100644
> --- a/drivers/i2c/busses/i2c-tegra.c
> +++ b/drivers/i2c/busses/i2c-tegra.c
> @@ -665,18 +665,23 @@ static int __maybe_unused tegra_i2c_runtime_resume(struct device *dev)
>  	ret = clk_enable(i2c_dev->slow_clk);
>  	if (ret < 0) {
>  		dev_err(dev, "failed to enable slow clock: %d\n", ret);
> -		return ret;
> +		goto disable_fast_clk;
>  	}
>  
>  	ret = clk_enable(i2c_dev->div_clk);
>  	if (ret < 0) {
>  		dev_err(i2c_dev->dev,
>  			"Enabling div clk failed, err %d\n", ret);
> -		clk_disable(i2c_dev->fast_clk);
> -		return ret;
> +		goto disable_slow_clk;
>  	}
>  
>  	return 0;
> +
> +disable_slow_clk:
> +	clk_disable(i2c_dev->slow_clk);
> +disable_fast_clk:
> +	clk_disable(i2c_dev->fast_clk);
> +	return ret;
>  }
>  
>  static int __maybe_unused tegra_i2c_runtime_suspend(struct device *dev)
> 
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>

Re: [RFC PATCH v4 04/14] i2c: tegra: Fix runtime resume to re-init VI I2C

[Dmitry Osipenko]

24.07.2020 02:51, Sowjanya Komatineni пишет:
> VI I2C is on host1x bus and is part of VE power domain.
> 
> During suspend/resume VE power domain goes through power off/on.
> 
> So, controller reset followed by i2c re-initialization is required
> after the domain power up.
> 
> This patch fixes it.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
> ---
>  drivers/i2c/busses/i2c-tegra.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
> index 7b93c45..1bf3666 100644
> --- a/drivers/i2c/busses/i2c-tegra.c
> +++ b/drivers/i2c/busses/i2c-tegra.c
> @@ -293,6 +293,8 @@ struct tegra_i2c_dev {
>  	bool is_curr_atomic_xfer;
>  };
>  
> +static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev, bool clk_reinit);
> +
>  static void dvc_writel(struct tegra_i2c_dev *i2c_dev, u32 val,
>  		       unsigned long reg)
>  {
> @@ -675,8 +677,22 @@ static int __maybe_unused tegra_i2c_runtime_resume(struct device *dev)
>  		goto disable_slow_clk;
>  	}
>  
> +	/*
> +	 * VI I2C device is attached to VE power domain which goes through
> +	 * power ON/OFF during PM runtime resume/suspend. So, controller
> +	 * should go through reset and need to re-initialize after power
> +	 * domain ON.
> +	 */
> +	if (i2c_dev->is_vi) {
> +		ret = tegra_i2c_init(i2c_dev, true);
> +		if (ret)
> +			goto disable_div_clk;
> +	}
> +
>  	return 0;
>  
> +disable_div_clk:
> +	clk_disable(i2c_dev->div_clk);
>  disable_slow_clk:
>  	clk_disable(i2c_dev->slow_clk);
>  disable_fast_clk:
> 

This look okay, but isn't RPM usage a bit too expensive for VI? Maybe
RPM autodelay needs to be set for the I2C driver?

Reviewed-by: Dmitry Osipenko <digetx@gmail.com>

Re: [RFC PATCH v4 05/14] i2c: tegra: Avoid tegra_i2c_init_dma() for Tegra210 vi i2c

[Dmitry Osipenko]

24.07.2020 02:51, Sowjanya Komatineni пишет:
> VI I2C is on host1x bus so APB DMA can't be used for Tegra210 VI
> I2C and there are no tx and rx dma channels for VI I2C.
> 
> So, avoid attempt of requesting DMA channels.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
> ---
>  drivers/i2c/busses/i2c-tegra.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
> index 1bf3666..00d3e4d 100644
> --- a/drivers/i2c/busses/i2c-tegra.c
> +++ b/drivers/i2c/busses/i2c-tegra.c
> @@ -421,7 +421,7 @@ static int tegra_i2c_init_dma(struct tegra_i2c_dev *i2c_dev)
>  	dma_addr_t dma_phys;
>  	int err;
>  
> -	if (!i2c_dev->hw->has_apb_dma)
> +	if (!i2c_dev->hw->has_apb_dma || i2c_dev->is_vi)
>  		return 0;
>  
>  	if (!IS_ENABLED(CONFIG_TEGRA20_APB_DMA)) {
> 

Reviewed-by: Dmitry Osipenko <digetx@gmail.com>

Re: [RFC PATCH v4 12/14] gpu: host1x: mipi: Keep MIPI clock enabled till calibration is done

[Dmitry Osipenko]

24.07.2020 02:51, Sowjanya Komatineni пишет:
> With the split of MIPI calibration into tegra_mipi_calibrate() and
> tegra_mipi_wait(), MIPI clock is not kept enabled till the calibration
> is done.
> 
> So, this patch skips disabling MIPI clock after triggering start of
> calibration and disables it only after waiting for done status from
> the calibration logic.
> 
> This patch renames tegra_mipi_calibrate() as tegra_mipi_start_calibration()
> and tegra_mipi_wait() as tegra_mipi_finish_calibration() to be inline
> with their usage....
> -int tegra_mipi_calibrate(struct tegra_mipi_device *device);
> -int tegra_mipi_wait(struct tegra_mipi_device *device);
> +int tegra_mipi_start_calibrate(struct tegra_mipi_device *device);
> +int tegra_mipi_finish_calibrate(struct tegra_mipi_device *device);
> +void tegra_mipi_cancel_calibrate(struct tegra_mipi_device *device);

Could you please use function names as they are named in the commit's
description? The "start_calibrate" doesn't sound like a proper English,
otherwise patch looks good to me.

Re: [RFC PATCH v4 00/14] Support for Tegra video capture from external sensor

[Dmitry Osipenko]

24.07.2020 12:43, Hans Verkuil пишет:
> Thierry, Dmitry,
> 
> I'm happy with this series from a media perspective. However, patches 1-5 fix
> various i2c-tegra.c issues and patch 12 changes mipi calibration functions in
> drivers/gpu that patch 13 relies on.
> 
> I think the i2c-tegra.c patches can be merged independently into the i2c
> subsystem, but patch 12 needs to be merged with the media patches. So for patch
> 12 I need an Acked-by from Thierry.
> 
> I can also take the i2c-tegra patches if preferred, but there too I need Acks.
> Dmitry, can you either take these i2c patches, or reply with Acks if you want
> me to take it?

Hello, Hans and everyone! The I2C patches are good to me.

Either way of merging the patches should be fine since it's a hardware
bring up phase, and thus, it's not critical if patches will be applied
in a wrong order.

I'm listed as a reviewer and not a maintainer of the Tegra I2C driver,
so it should be up to Thierry and Wolfram to decide how to merge the I2C
patches.

Re: [RFC PATCH v4 04/14] i2c: tegra: Fix runtime resume to re-init VI I2C

[Sowjanya Komatineni]

On 7/26/20 4:53 PM, Dmitry Osipenko wrote:
> 24.07.2020 02:51, Sowjanya Komatineni пишет:
>> VI I2C is on host1x bus and is part of VE power domain.
>>
>> During suspend/resume VE power domain goes through power off/on.
>>
>> So, controller reset followed by i2c re-initialization is required
>> after the domain power up.
>>
>> This patch fixes it.
>>
>> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
>> ---
>>   drivers/i2c/busses/i2c-tegra.c | 16 ++++++++++++++++
>>   1 file changed, 16 insertions(+)
>>
>> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
>> index 7b93c45..1bf3666 100644
>> --- a/drivers/i2c/busses/i2c-tegra.c
>> +++ b/drivers/i2c/busses/i2c-tegra.c
>> @@ -293,6 +293,8 @@ struct tegra_i2c_dev {
>>   	bool is_curr_atomic_xfer;
>>   };
>>   
>> +static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev, bool clk_reinit);
>> +
>>   static void dvc_writel(struct tegra_i2c_dev *i2c_dev, u32 val,
>>   		       unsigned long reg)
>>   {
>> @@ -675,8 +677,22 @@ static int __maybe_unused tegra_i2c_runtime_resume(struct device *dev)
>>   		goto disable_slow_clk;
>>   	}
>>   
>> +	/*
>> +	 * VI I2C device is attached to VE power domain which goes through
>> +	 * power ON/OFF during PM runtime resume/suspend. So, controller
>> +	 * should go through reset and need to re-initialize after power
>> +	 * domain ON.
>> +	 */
>> +	if (i2c_dev->is_vi) {
>> +		ret = tegra_i2c_init(i2c_dev, true);
>> +		if (ret)
>> +			goto disable_div_clk;
>> +	}
>> +
>>   	return 0;
>>   
>> +disable_div_clk:
>> +	clk_disable(i2c_dev->div_clk);
>>   disable_slow_clk:
>>   	clk_disable(i2c_dev->slow_clk);
>>   disable_fast_clk:
>>
> This look okay, but isn't RPM usage a bit too expensive for VI? Maybe
> RPM autodelay needs to be set for the I2C driver?
>
> Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
>
Thanks Dmitry. Will look into and have separate patch for VI I2C RPM 
auto-delay out of this series sometime next week.

Regards

Sowjanya