diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/msm/dsi/dsi_host.c | 72 |
1 files changed, 53 insertions, 19 deletions
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c index ef60aef6e03b..dc4d3e9d93c0 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_host.c +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c @@ -21,6 +21,7 @@ #include <linux/of_gpio.h> #include <linux/of_irq.h> #include <linux/pinctrl/consumer.h> +#include <linux/of_graph.h> #include <linux/regulator/consumer.h> #include <linux/spinlock.h> #include <video/mipi_display.h> @@ -1402,7 +1403,7 @@ static int dsi_host_attach(struct mipi_dsi_host *host, msm_host->format = dsi->format; msm_host->mode_flags = dsi->mode_flags; - msm_host->panel_node = dsi->dev.of_node; + WARN_ON(dsi->dev.of_node != msm_host->panel_node); /* Some gpios defined in panel DT need to be controlled by host */ ret = dsi_host_init_panel_gpios(msm_host, &dsi->dev); @@ -1452,6 +1453,48 @@ static struct mipi_dsi_host_ops dsi_host_ops = { .transfer = dsi_host_transfer, }; +static int dsi_host_parse_dt(struct msm_dsi_host *msm_host) +{ + struct device *dev = &msm_host->pdev->dev; + struct device_node *np = dev->of_node; + struct device_node *endpoint, *panel_node; + int ret; + + ret = of_property_read_u32(np, "qcom,dsi-host-index", &msm_host->id); + if (ret) { + dev_err(dev, "%s: host index not specified, ret=%d\n", + __func__, ret); + return ret; + } + + /* + * Get the first endpoint node. In our case, dsi has one output port + * to which the panel is connected. Don't return an error if a port + * isn't defined. It's possible that there is nothing connected to + * the dsi output. + */ + endpoint = of_graph_get_next_endpoint(np, NULL); + if (!endpoint) { + dev_dbg(dev, "%s: no endpoint\n", __func__); + return 0; + } + + /* Get panel node from the output port's endpoint data */ + panel_node = of_graph_get_remote_port_parent(endpoint); + if (!panel_node) { + dev_err(dev, "%s: no valid device\n", __func__); + of_node_put(endpoint); + return -ENODEV; + } + + of_node_put(endpoint); + of_node_put(panel_node); + + msm_host->panel_node = panel_node; + + return 0; +} + int msm_dsi_host_init(struct msm_dsi *msm_dsi) { struct msm_dsi_host *msm_host = NULL; @@ -1466,15 +1509,13 @@ int msm_dsi_host_init(struct msm_dsi *msm_dsi) goto fail; } - ret = of_property_read_u32(pdev->dev.of_node, - "qcom,dsi-host-index", &msm_host->id); + msm_host->pdev = pdev; + + ret = dsi_host_parse_dt(msm_host); if (ret) { - dev_err(&pdev->dev, - "%s: host index not specified, ret=%d\n", - __func__, ret); + pr_err("%s: failed to parse dt\n", __func__); goto fail; } - msm_host->pdev = pdev; ret = dsi_clk_init(msm_host); if (ret) { @@ -1582,7 +1623,6 @@ int msm_dsi_host_modeset_init(struct mipi_dsi_host *host, int msm_dsi_host_register(struct mipi_dsi_host *host, bool check_defer) { struct msm_dsi_host *msm_host = to_msm_dsi_host(host); - struct device_node *node; int ret; /* Register mipi dsi host */ @@ -1600,18 +1640,12 @@ int msm_dsi_host_register(struct mipi_dsi_host *host, bool check_defer) * It makes sure panel is connected when fbcon detects * connector status and gets the proper display mode to * create framebuffer. + * Don't try to defer if there is nothing connected to the dsi + * output */ - if (check_defer) { - node = of_get_child_by_name(msm_host->pdev->dev.of_node, - "panel"); - if (node) { - if (!of_drm_find_panel(node)) { - of_node_put(node); - return -EPROBE_DEFER; - } - - of_node_put(node); - } + if (check_defer && msm_host->panel_node) { + if (!of_drm_find_panel(msm_host->panel_node)) + return -EPROBE_DEFER; } } |