diff options
author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2021-08-06 14:29:52 +0300 |
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committer | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2022-10-19 16:55:40 +0300 |
commit | 52c2cf1471b35eda9a29c8dfdee5c687909e126a (patch) | |
tree | a07d2a772060aa54e10029b5031fe0ddbdb2f77e /drivers/gpu/drm/xlnx/zynqmp_dpsub.c | |
parent | 4ce6ecd499749177b361d164849bd34924b7b3b7 (diff) | |
download | linux-52c2cf1471b35eda9a29c8dfdee5c687909e126a.tar.xz |
drm: xlnx: zynqmp_dpsub: Parse DT to find connected ports
To prepare for live video input support, parse the device tree to find
the connected ports. Warn about unsupported configurations, and error
out when invalid.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Diffstat (limited to 'drivers/gpu/drm/xlnx/zynqmp_dpsub.c')
-rw-r--r-- | drivers/gpu/drm/xlnx/zynqmp_dpsub.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dpsub.c b/drivers/gpu/drm/xlnx/zynqmp_dpsub.c index 86faa6edda4b..6627a1ec7791 100644 --- a/drivers/gpu/drm/xlnx/zynqmp_dpsub.c +++ b/drivers/gpu/drm/xlnx/zynqmp_dpsub.c @@ -12,6 +12,7 @@ #include <linux/clk.h> #include <linux/dma-mapping.h> #include <linux/module.h> +#include <linux/of_graph.h> #include <linux/of_reserved_mem.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> @@ -142,6 +143,55 @@ static int zynqmp_dpsub_init_clocks(struct zynqmp_dpsub *dpsub) return 0; } +static int zynqmp_dpsub_parse_dt(struct zynqmp_dpsub *dpsub) +{ + struct device_node *np; + unsigned int i; + + /* + * For backward compatibility with old device trees that don't contain + * ports, consider that only the DP output port is connected if no + * ports child no exists. + */ + np = of_get_child_by_name(dpsub->dev->of_node, "ports"); + of_node_put(np); + if (!np) { + dev_warn(dpsub->dev, "missing ports, update DT bindings\n"); + dpsub->connected_ports = BIT(ZYNQMP_DPSUB_PORT_OUT_DP); + return 0; + } + + /* Check which ports are connected. */ + for (i = 0; i < ZYNQMP_DPSUB_NUM_PORTS; ++i) { + struct device_node *np; + + np = of_graph_get_remote_node(dpsub->dev->of_node, i, -1); + if (np) { + dpsub->connected_ports |= BIT(i); + of_node_put(np); + } + } + + /* Sanity checks. */ + if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO)) || + (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))) + dev_warn(dpsub->dev, "live video unsupported, ignoring\n"); + + if (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_AUDIO)) + dev_warn(dpsub->dev, "live audio unsupported, ignoring\n"); + + if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_VIDEO)) || + (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_AUDIO))) + dev_warn(dpsub->dev, "output to PL unsupported, ignoring\n"); + + if (!(dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_DP))) { + dev_err(dpsub->dev, "DP output port not connected\n"); + return -EINVAL; + } + + return 0; +} + void zynqmp_dpsub_release(struct zynqmp_dpsub *dpsub) { kfree(dpsub->disp); @@ -171,6 +221,10 @@ static int zynqmp_dpsub_probe(struct platform_device *pdev) if (ret < 0) goto err_mem; + ret = zynqmp_dpsub_parse_dt(dpsub); + if (ret < 0) + goto err_mem; + pm_runtime_enable(&pdev->dev); /* |