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path: root/drivers/gpu/drm/tegra/dc.c
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Diffstat (limited to 'drivers/gpu/drm/tegra/dc.c')
-rw-r--r--drivers/gpu/drm/tegra/dc.c41
1 files changed, 39 insertions, 2 deletions
diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index 386f3b4b0094..9336006b475d 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -1100,8 +1100,6 @@ static int tegra_dc_init(struct host1x_client *client)
struct tegra_dc *dc = host1x_client_to_dc(client);
int err;
- dc->pipe = tegra->drm->mode_config.num_crtc;
-
drm_crtc_init(tegra->drm, &dc->base, &tegra_crtc_funcs);
drm_mode_crtc_set_gamma_size(&dc->base, 256);
drm_crtc_helper_add(&dc->base, &tegra_crtc_helper_funcs);
@@ -1187,6 +1185,41 @@ static const struct of_device_id tegra_dc_of_match[] = {
}
};
+static int tegra_dc_parse_dt(struct tegra_dc *dc)
+{
+ struct device_node *np;
+ u32 value = 0;
+ int err;
+
+ err = of_property_read_u32(dc->dev->of_node, "nvidia,head", &value);
+ if (err < 0) {
+ dev_err(dc->dev, "missing \"nvidia,head\" property\n");
+
+ /*
+ * If the nvidia,head property isn't present, try to find the
+ * correct head number by looking up the position of this
+ * display controller's node within the device tree. Assuming
+ * that the nodes are ordered properly in the DTS file and
+ * that the translation into a flattened device tree blob
+ * preserves that ordering this will actually yield the right
+ * head number.
+ *
+ * If those assumptions don't hold, this will still work for
+ * cases where only a single display controller is used.
+ */
+ for_each_matching_node(np, tegra_dc_of_match) {
+ if (np == dc->dev->of_node)
+ break;
+
+ value++;
+ }
+ }
+
+ dc->pipe = value;
+
+ return 0;
+}
+
static int tegra_dc_probe(struct platform_device *pdev)
{
const struct of_device_id *id;
@@ -1207,6 +1240,10 @@ static int tegra_dc_probe(struct platform_device *pdev)
dc->dev = &pdev->dev;
dc->soc = id->data;
+ err = tegra_dc_parse_dt(dc);
+ if (err < 0)
+ return err;
+
dc->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(dc->clk)) {
dev_err(&pdev->dev, "failed to get clock\n");

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