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Subject[PATCH v3 07/11] drm: sun4i: Add support for enabling DDC I2C bus power to dw_hdmi glue
Date
From: Ondrej Jirman <megous@megous.com>

Orange Pi 3 board requires enabling DDC I2C bus via some GPIO connected
transistors, before the bus can be used.

Model this as a power supply for DDC bus on the HDMI connector connected
to the output port (port 1) of the HDMI controller.

Signed-off-by: Ondrej Jirman <megous@megous.com>
---
drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c | 60 ++++++++++++++++++++++++++-
drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h | 2 +
2 files changed, 60 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
index 39d8509d96a0..1b6ffba41177 100644
--- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
+++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
@@ -98,6 +98,30 @@ static u32 sun8i_dw_hdmi_find_possible_crtcs(struct drm_device *drm,
return crtcs;
}

+static int sun8i_dw_hdmi_find_connector_pdev(struct device *dev,
+ struct platform_device **pdev_out)
+{
+ struct platform_device* pdev;
+ struct device_node *remote;
+
+ remote = of_graph_get_remote_node(dev->of_node, 1, -1);
+ if (!remote)
+ return -ENODEV;
+
+ if (!of_device_is_compatible(remote, "hdmi-connector")) {
+ of_node_put(remote);
+ return -ENODEV;
+ }
+
+ pdev = of_find_device_by_node(remote);
+ of_node_put(remote);
+ if (!pdev)
+ return -ENODEV;
+
+ *pdev_out = pdev;
+ return 0;
+}
+
static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
void *data)
{
@@ -151,16 +175,34 @@ static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
return PTR_ERR(hdmi->regulator);
}

+ ret = sun8i_dw_hdmi_find_connector_pdev(dev, &hdmi->connector_pdev);
+ if (!ret) {
+ hdmi->ddc_regulator = regulator_get(&hdmi->connector_pdev->dev, "ddc");
+ if (IS_ERR(hdmi->ddc_regulator)) {
+ platform_device_put(hdmi->connector_pdev);
+ dev_err(dev, "Couldn't get ddc regulator\n");
+ return PTR_ERR(hdmi->ddc_regulator);
+ }
+ }
+
ret = regulator_enable(hdmi->regulator);
if (ret) {
dev_err(dev, "Failed to enable regulator\n");
- return ret;
+ goto err_unref_ddc_regulator;
+ }
+
+ if (hdmi->ddc_regulator) {
+ ret = regulator_enable(hdmi->ddc_regulator);
+ if (ret) {
+ dev_err(dev, "Failed to enable ddc regulator\n");
+ goto err_disable_regulator;
+ }
}

ret = reset_control_deassert(hdmi->rst_ctrl);
if (ret) {
dev_err(dev, "Could not deassert ctrl reset control\n");
- goto err_disable_regulator;
+ goto err_disable_ddc_regulator;
}

ret = clk_prepare_enable(hdmi->clk_tmds);
@@ -213,8 +255,15 @@ static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
clk_disable_unprepare(hdmi->clk_tmds);
err_assert_ctrl_reset:
reset_control_assert(hdmi->rst_ctrl);
+err_disable_ddc_regulator:
+ if (hdmi->ddc_regulator)
+ regulator_disable(hdmi->ddc_regulator);
err_disable_regulator:
regulator_disable(hdmi->regulator);
+err_unref_ddc_regulator:
+ if (hdmi->ddc_regulator)
+ regulator_put(hdmi->ddc_regulator);
+ platform_device_put(hdmi->connector_pdev);

return ret;
}
@@ -229,6 +278,13 @@ static void sun8i_dw_hdmi_unbind(struct device *dev, struct device *master,
clk_disable_unprepare(hdmi->clk_tmds);
reset_control_assert(hdmi->rst_ctrl);
regulator_disable(hdmi->regulator);
+
+ if (hdmi->ddc_regulator) {
+ regulator_disable(hdmi->ddc_regulator);
+ regulator_put(hdmi->ddc_regulator);
+ }
+
+ platform_device_put(hdmi->connector_pdev);
}

static const struct component_ops sun8i_dw_hdmi_ops = {
diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
index 720c5aa8adc1..60f5200aee73 100644
--- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
+++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
@@ -188,8 +188,10 @@ struct sun8i_dw_hdmi {
struct sun8i_hdmi_phy *phy;
struct dw_hdmi_plat_data plat_data;
struct regulator *regulator;
+ struct regulator *ddc_regulator;
const struct sun8i_dw_hdmi_quirks *quirks;
struct reset_control *rst_ctrl;
+ struct platform_device *connector_pdev;
};

static inline struct sun8i_dw_hdmi *
--
2.21.0
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