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authorThierry Reding <treding@nvidia.com>2014-02-28 16:57:34 +0100
committerThierry Reding <treding@nvidia.com>2014-06-05 23:09:21 +0200
commitfb50a116bbbc25c7c11e00e6d10a53b9ec3c38e8 (patch)
tree8f37152a6ed2b59aa407245a7dffa3d509a65919
parent0444c0ff3cef9f99b19bbb1f0b3f5d7a22daab25 (diff)
drm/tegra: hdmi - Add connector supply support
Revert commit 18ebc0f404d5 "drm/tegra: hdmi: Enable VDD earlier for hotplug/DDC" and instead add a new supply for the +5V pin on the HDMI connector. The vdd-supply property refers to the regulator that supplies the AVDD_HDMI input on Tegra, rather than the +5V HDMI connector pin. This was never a problem before, because all boards had that pin hooked up to a regulator that was always on. Starting with Dalmore and continuing with Venice2, the +5V pin is controllable via a GPIO. For reasons unknown, the GPIO ended up as the controlling GPIO of the AVDD_HDMI supply in the Dalmore and Venice2 DTS files. But that's not correct. Instead, a separate supply must be introduced so that the +5V pin can be controlled separately from the supplies that feed the HDMI block within Tegra. A new hdmi-supply property is introduced that takes the place of the vdd-supply and vdd-supply is only enabled when HDMI is enabled rather than all the time. Signed-off-by: Thierry Reding <treding@nvidia.com>
-rw-r--r--Documentation/devicetree/bindings/gpu/nvidia,tegra20-host1x.txt1
-rw-r--r--drivers/gpu/drm/tegra/hdmi.c32
2 files changed, 24 insertions, 9 deletions
diff --git a/Documentation/devicetree/bindings/gpu/nvidia,tegra20-host1x.txt b/Documentation/devicetree/bindings/gpu/nvidia,tegra20-host1x.txt
index efa8b8451f93..f13a6b8263d3 100644
--- a/Documentation/devicetree/bindings/gpu/nvidia,tegra20-host1x.txt
+++ b/Documentation/devicetree/bindings/gpu/nvidia,tegra20-host1x.txt
@@ -136,6 +136,7 @@ of the following host1x client modules:
- compatible: "nvidia,tegra<chip>-hdmi"
- reg: Physical base address and length of the controller's registers.
- interrupts: The interrupt outputs from the controller.
+ - hdmi-supply: supply for the +5V HDMI connector pin
- vdd-supply: regulator for supply voltage
- pll-supply: regulator for PLL
- clocks: Must contain an entry for each entry in clock-names.
diff --git a/drivers/gpu/drm/tegra/hdmi.c b/drivers/gpu/drm/tegra/hdmi.c
index 6928015d11a4..8b797913470a 100644
--- a/drivers/gpu/drm/tegra/hdmi.c
+++ b/drivers/gpu/drm/tegra/hdmi.c
@@ -42,6 +42,7 @@ struct tegra_hdmi {
struct device *dev;
bool enabled;
+ struct regulator *hdmi;
struct regulator *vdd;
struct regulator *pll;
@@ -710,6 +711,12 @@ static int tegra_output_hdmi_enable(struct tegra_output *output)
h_back_porch = mode->htotal - mode->hsync_end;
h_front_porch = mode->hsync_start - mode->hdisplay;
+ err = regulator_enable(hdmi->vdd);
+ if (err < 0) {
+ dev_err(hdmi->dev, "failed to enable VDD regulator: %d\n", err);
+ return err;
+ }
+
err = regulator_enable(hdmi->pll);
if (err < 0) {
dev_err(hdmi->dev, "failed to enable PLL regulator: %d\n", err);
@@ -950,6 +957,7 @@ static int tegra_output_hdmi_disable(struct tegra_output *output)
reset_control_assert(hdmi->rst);
clk_disable(hdmi->clk);
regulator_disable(hdmi->pll);
+ regulator_disable(hdmi->vdd);
hdmi->enabled = false;
@@ -1256,13 +1264,6 @@ static int tegra_hdmi_init(struct host1x_client *client)
struct tegra_hdmi *hdmi = host1x_client_to_hdmi(client);
int err;
- err = regulator_enable(hdmi->vdd);
- if (err < 0) {
- dev_err(client->dev, "failed to enable VDD regulator: %d\n",
- err);
- return err;
- }
-
hdmi->output.type = TEGRA_OUTPUT_HDMI;
hdmi->output.dev = client->dev;
hdmi->output.ops = &hdmi_ops;
@@ -1279,6 +1280,13 @@ static int tegra_hdmi_init(struct host1x_client *client)
dev_err(client->dev, "debugfs setup failed: %d\n", err);
}
+ err = regulator_enable(hdmi->hdmi);
+ if (err < 0) {
+ dev_err(client->dev, "failed to enable HDMI regulator: %d\n",
+ err);
+ return err;
+ }
+
return 0;
}
@@ -1287,6 +1295,8 @@ static int tegra_hdmi_exit(struct host1x_client *client)
struct tegra_hdmi *hdmi = host1x_client_to_hdmi(client);
int err;
+ regulator_disable(hdmi->hdmi);
+
if (IS_ENABLED(CONFIG_DEBUG_FS)) {
err = tegra_hdmi_debugfs_exit(hdmi);
if (err < 0)
@@ -1306,8 +1316,6 @@ static int tegra_hdmi_exit(struct host1x_client *client)
return err;
}
- regulator_disable(hdmi->vdd);
-
return 0;
}
@@ -1399,6 +1407,12 @@ static int tegra_hdmi_probe(struct platform_device *pdev)
return err;
}
+ hdmi->hdmi = devm_regulator_get(&pdev->dev, "hdmi");
+ if (IS_ERR(hdmi->hdmi)) {
+ dev_err(&pdev->dev, "failed to get HDMI regulator\n");
+ return PTR_ERR(hdmi->hdmi);
+ }
+
hdmi->vdd = devm_regulator_get(&pdev->dev, "vdd");
if (IS_ERR(hdmi->vdd)) {
dev_err(&pdev->dev, "failed to get VDD regulator\n");