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From 3b21da2334113027d91829e1fabe332cf21522a3 Mon Sep 17 00:00:00 2001
From: Daniel Scally <djrscally@gmail.com>
Date: Tue, 15 Feb 2022 23:07:31 +0000
Subject: [PATCH] media: i2c: Provide ov7251_check_hwcfg()
Move the endpoint checking from .probe() to a dedicated function,
and additionally check that the firmware provided link frequencies
are a match for those supported by the driver. Finally, return
-EPROBE_DEFER if the endpoint is not available, as it could be built
by the ipu3-cio2 driver if that probes later.
Signed-off-by: Daniel Scally <djrscally@gmail.com>
---
drivers/media/i2c/ov7251.c | 84 ++++++++++++++++++++++++++++++--------
1 file changed, 66 insertions(+), 18 deletions(-)
--- a/drivers/media/i2c/ov7251.c
+++ b/drivers/media/i2c/ov7251.c
@@ -1255,11 +1255,74 @@ static const struct v4l2_subdev_ops ov72
.pad = &ov7251_subdev_pad_ops,
};
+static int ov7251_check_hwcfg(struct ov7251 *ov7251)
+{
+ struct fwnode_handle *fwnode = dev_fwnode(ov7251->dev);
+ struct v4l2_fwnode_endpoint bus_cfg = {
+ .bus_type = V4L2_MBUS_CSI2_DPHY,
+ };
+ struct fwnode_handle *endpoint;
+ bool freq_found;
+ int i, j;
+ int ret;
+
+ endpoint = fwnode_graph_get_next_endpoint(fwnode, NULL);
+ if (!endpoint)
+ return -EPROBE_DEFER; /* could be provided by cio2-bridge */
+
+ ret = v4l2_fwnode_endpoint_alloc_parse(endpoint, &bus_cfg);
+ fwnode_handle_put(endpoint);
+ if (ret)
+ return dev_err_probe(ov7251->dev, ret,
+ "parsing endpoint node failed\n");
+
+ if (bus_cfg.bus_type != V4L2_MBUS_CSI2_DPHY) {
+ ret = -EINVAL;
+ dev_err(ov7251->dev, "invalid bus type (%u), must be (%u)\n",
+ bus_cfg.bus_type, V4L2_MBUS_CSI2_DPHY);
+ goto out_free_bus_cfg;
+ }
+
+ if (bus_cfg.bus.mipi_csi2.num_data_lanes != 1) {
+ dev_err(ov7251->dev, "only a 1-lane CSI2 config is supported");
+ ret = -EINVAL;
+ goto out_free_bus_cfg;
+ }
+
+ if (!bus_cfg.nr_of_link_frequencies) {
+ dev_err(ov7251->dev, "no link frequencies defined\n");
+ ret = -EINVAL;
+ goto out_free_bus_cfg;
+ }
+
+ freq_found = false;
+ for (i = 0; i < bus_cfg.nr_of_link_frequencies; i++) {
+ if (freq_found)
+ break;
+
+ for (j = 0; j < ARRAY_SIZE(link_freq); j++)
+ if (bus_cfg.link_frequencies[i] == link_freq[j]) {
+ freq_found = true;
+ break;
+ }
+ }
+
+ if (i == bus_cfg.nr_of_link_frequencies) {
+ dev_err(ov7251->dev, "no supported link freq found\n");
+ ret = -EINVAL;
+ goto out_free_bus_cfg;
+ }
+
+out_free_bus_cfg:
+ v4l2_fwnode_endpoint_free(&bus_cfg);
+
+ return ret;
+}
+
static int ov7251_probe(struct i2c_client *client)
{
struct v4l2_fwnode_device_properties props;
struct device *dev = &client->dev;
- struct fwnode_handle *endpoint;
struct ov7251 *ov7251;
u8 chip_id_high, chip_id_low, chip_rev;
int ret;
@@ -1271,24 +1334,9 @@ static int ov7251_probe(struct i2c_clien
ov7251->i2c_client = client;
ov7251->dev = dev;
- endpoint = fwnode_graph_get_next_endpoint(dev_fwnode(dev), NULL);
- if (!endpoint) {
- dev_err(dev, "endpoint node not found\n");
- return -EINVAL;
- }
-
- ret = v4l2_fwnode_endpoint_parse(endpoint, &ov7251->ep);
- fwnode_handle_put(endpoint);
- if (ret < 0) {
- dev_err(dev, "parsing endpoint node failed\n");
+ ret = ov7251_check_hwcfg(ov7251);
+ if (ret)
return ret;
- }
-
- if (ov7251->ep.bus_type != V4L2_MBUS_CSI2_DPHY) {
- dev_err(dev, "invalid bus type (%u), must be CSI2 (%u)\n",
- ov7251->ep.bus_type, V4L2_MBUS_CSI2_DPHY);
- return -EINVAL;
- }
/* get system clock (xclk) */
ov7251->xclk = devm_clk_get(dev, "xclk");
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