[PATCH 2/2] drm/tegra: Enable HDMI_5V_CON regulator

[dgreid@chromium.org (Dylan Reid)]

The DDC bus uses this for it's supply, enable it so EDID can be read.
This eliminates I2C read timeouts on Venice2 and EDID can be verified
with i2cdump.

Signed-off-by: Dylan Reid <dgreid@chromium.org>
---
 drivers/gpu/drm/tegra/hdmi.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/tegra/hdmi.c b/drivers/gpu/drm/tegra/hdmi.c
index 6928015..3d3cd7e 100644
--- a/drivers/gpu/drm/tegra/hdmi.c
+++ b/drivers/gpu/drm/tegra/hdmi.c
@@ -44,6 +44,7 @@ struct tegra_hdmi {
 
 	struct regulator *vdd;
 	struct regulator *pll;
+	struct regulator *hdmi_5v;
 
 	void __iomem *regs;
 	unsigned int irq;
@@ -1263,6 +1264,13 @@ static int tegra_hdmi_init(struct host1x_client *client)
 		return err;
 	}
 
+	err = regulator_enable(hdmi->hdmi_5v);
+	if (err < 0) {
+		dev_err(client->dev, "failed to enable HDMI 5V regulator: %d\n",
+			err);
+		return err;
+	}
+
 	hdmi->output.type = TEGRA_OUTPUT_HDMI;
 	hdmi->output.dev = client->dev;
 	hdmi->output.ops = &hdmi_ops;
@@ -1307,6 +1315,7 @@ static int tegra_hdmi_exit(struct host1x_client *client)
 	}
 
 	regulator_disable(hdmi->vdd);
+	regulator_disable(hdmi->hdmi_5v);
 
 	return 0;
 }
@@ -1411,6 +1420,12 @@ static int tegra_hdmi_probe(struct platform_device *pdev)
 		return PTR_ERR(hdmi->pll);
 	}
 
+	hdmi->hdmi_5v = devm_regulator_get(&pdev->dev, "hdmi");
+	if (IS_ERR(hdmi->hdmi_5v)) {
+		dev_err(&pdev->dev, "failed to get HDMI 5V regulator\n");
+		return PTR_ERR(hdmi->hdmi_5v);
+	}
+
 	hdmi->output.dev = &pdev->dev;
 
 	err = tegra_output_probe(&hdmi->output);
-- 
1.8.1.3.605.g02339dd