1 files changed, 284 insertions, 30 deletions

diff --git a/drivers/staging/media/tegra-video/csi.c b/drivers/staging/media/tegra-video/csi.c
index 40ea195d141d..a19c85c57fca 100644
--- a/drivers/staging/media/tegra-video/csi.c
+++ b/drivers/staging/media/tegra-video/csi.c
@@ -9,13 +9,18 @@
 #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"
 
+#define MHZ			1000000
+
 static inline struct tegra_csi *
 host1x_client_to_csi(struct host1x_client *client)
 {
@@ -62,6 +67,9 @@ 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 +84,9 @@ 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 +132,9 @@ 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 +162,9 @@ 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 +189,9 @@ 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,
@@ -208,40 +228,157 @@ 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;
 
 	return 0;
 }
 
-static int tegra_csi_s_stream(struct v4l2_subdev *subdev, int enable)
+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_enable_stream(struct v4l2_subdev *subdev)
 {
 	struct tegra_vi_channel *chan = v4l2_get_subdev_hostdata(subdev);
 	struct tegra_csi_channel *csi_chan = to_csi_chan(subdev);
 	struct tegra_csi *csi = csi_chan->csi;
-	int ret = 0;
+	int ret, err;
 
-	csi_chan->pg_mode = chan->pg_mode;
-	if (enable) {
-		ret = pm_runtime_get_sync(csi->dev);
+	ret = pm_runtime_get_sync(csi->dev);
+	if (ret < 0) {
+		dev_err(csi->dev, "failed to get runtime PM: %d\n", ret);
+		pm_runtime_put_noidle(csi->dev);
+		return ret;
+	}
+
+	if (csi_chan->mipi) {
+		ret = tegra_mipi_enable(csi_chan->mipi);
 		if (ret < 0) {
 			dev_err(csi->dev,
-				"failed to get runtime PM: %d\n", ret);
-			pm_runtime_put_noidle(csi->dev);
-			return ret;
+				"failed to enable MIPI pads: %d\n", ret);
+			goto rpm_put;
 		}
 
-		ret = csi->ops->csi_start_streaming(csi_chan);
-		if (ret < 0)
-			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_calibration(csi_chan->mipi);
+		if (ret < 0) {
+			dev_err(csi->dev,
+				"failed to start MIPI calibration: %d\n", ret);
+			goto disable_mipi;
+		}
+	}
 
-		return 0;
+	csi_chan->pg_mode = chan->pg_mode;
+	ret = csi->ops->csi_start_streaming(csi_chan);
+	if (ret < 0)
+		goto finish_calibration;
+
+	return 0;
+
+finish_calibration:
+	if (csi_chan->mipi)
+		tegra_mipi_finish_calibration(csi_chan->mipi);
+disable_mipi:
+	if (csi_chan->mipi) {
+		err = tegra_mipi_disable(csi_chan->mipi);
+		if (err < 0)
+			dev_err(csi->dev,
+				"failed to disable MIPI pads: %d\n", err);
 	}
 
+rpm_put:
+	pm_runtime_put(csi->dev);
+	return ret;
+}
+
+static int tegra_csi_disable_stream(struct v4l2_subdev *subdev)
+{
+	struct tegra_csi_channel *csi_chan = to_csi_chan(subdev);
+	struct tegra_csi *csi = csi_chan->csi;
+	int err;
+
 	csi->ops->csi_stop_streaming(csi_chan);
 
-rpm_put:
+	if (csi_chan->mipi) {
+		err = tegra_mipi_disable(csi_chan->mipi);
+		if (err < 0)
+			dev_err(csi->dev,
+				"failed to disable MIPI pads: %d\n", err);
+	}
+
 	pm_runtime_put(csi->dev);
+
+	return 0;
+}
+
+static int tegra_csi_s_stream(struct v4l2_subdev *subdev, int enable)
+{
+	int ret;
+
+	if (enable)
+		ret = tegra_csi_enable_stream(subdev);
+	else
+		ret = tegra_csi_disable_stream(subdev);
+
 	return ret;
 }
 
@@ -267,29 +404,123 @@ 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;
+	int ret = 0;
+
+	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;
+	}
+
+	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)
 {
 	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 for %pOF\n",
+				portno, channel);
+			ret = -EINVAL;
+			goto err_node_put;
+		}
+
+		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 for %pOF: %d\n",
+				channel, ret);
+			goto err_node_put;
+		}
+
+		lanes = v4l2_ep.bus.mipi_csi2.num_data_lanes;
+		if (!lanes || ((lanes & (lanes - 1)) != 0)) {
+			dev_err(csi->dev, "invalid data-lanes %d for %pOF\n",
+				lanes, channel);
+			ret = -EINVAL;
+			goto err_node_put;
+		}
+
+		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)
+				goto err_node_put;
+		}
 	}
 
 	return 0;
+
+err_node_put:
+	of_node_put(channel);
+	return ret;
 }
 
 static int tegra_csi_channel_init(struct tegra_csi_channel *chan)
@@ -311,8 +542,12 @@ 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);
@@ -328,6 +563,15 @@ 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;
 }
 
@@ -366,9 +610,16 @@ 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 (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);
 	}
@@ -405,10 +656,13 @@ static int tegra_csi_init(struct host1x_client *client)
 
 	INIT_LIST_HEAD(&csi->csi_chans);
 
-	ret = tegra_csi_tpg_channels_alloc(csi);
+	if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
+		ret = tegra_csi_tpg_channels_alloc(csi);
+	else
+		ret = tegra_csi_channels_alloc(csi);
 	if (ret < 0) {
 		dev_err(csi->dev,
-			"failed to allocate tpg channels: %d\n", ret);
+			"failed to allocate channels: %d\n", ret);
 		goto cleanup;
 	}