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drm: sun4i: Add support for enabling DDC I2C bus to sun8i_dw_hdmi glue

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Orange Pi 3 board requires enabling a voltage shifting circuit via GPIO
for the DDC bus to be usable.

Add support for hdmi-connector node's optional ddc-en-gpios property to
support this use case.

Signed-off-by: Ondrej Jirman <megous@megous.com>
Reviewed-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190806155744.10263-4-megous@megous.com
This commit is contained in:
Ondrej Jirman 2019-08-06 17:57:42 +02:00 committed by Maxime Ripard
parent f6700060f5
commit 4c8b4c3855
No known key found for this signature in database
GPG key ID: E3EF0D6F671851C5
2 changed files with 52 additions and 4 deletions
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54
drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
View file

@ -97,10 +97,34 @@ 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)
{
struct platform_device *pdev = to_platform_device(dev);
struct platform_device *pdev = to_platform_device(dev), *connector_pdev;
struct dw_hdmi_plat_data *plat_data;
struct drm_device *drm = data;
struct device_node *phy_node;
@ -150,16 +174,30 @@ 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, &connector_pdev);
if (!ret) {
hdmi->ddc_en = gpiod_get_optional(&connector_pdev->dev,
"ddc-en", GPIOD_OUT_HIGH);
platform_device_put(connector_pdev);
if (IS_ERR(hdmi->ddc_en)) {
dev_err(dev, "Couldn't get ddc-en gpio\n");
return PTR_ERR(hdmi->ddc_en);
}
}
ret = regulator_enable(hdmi->regulator);
if (ret) {
dev_err(dev, "Failed to enable regulator\n");
return ret;
goto err_unref_ddc_en;
}
gpiod_set_value(hdmi->ddc_en, 1);
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_en;
}
ret = clk_prepare_enable(hdmi->clk_tmds);
@ -212,8 +250,12 @@ 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_regulator:
err_disable_ddc_en:
gpiod_set_value(hdmi->ddc_en, 0);
regulator_disable(hdmi->regulator);
err_unref_ddc_en:
if (hdmi->ddc_en)
gpiod_put(hdmi->ddc_en);
return ret;
}
@ -227,7 +269,11 @@ static void sun8i_dw_hdmi_unbind(struct device *dev, struct device *master,
sun8i_hdmi_phy_remove(hdmi);
clk_disable_unprepare(hdmi->clk_tmds);
reset_control_assert(hdmi->rst_ctrl);
gpiod_set_value(hdmi->ddc_en, 0);
regulator_disable(hdmi->regulator);
if (hdmi->ddc_en)
gpiod_put(hdmi->ddc_en);
}
static const struct component_ops sun8i_dw_hdmi_ops = {

2
drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
View file

@ -9,6 +9,7 @@
#include <drm/bridge/dw_hdmi.h>
#include <drm/drm_encoder.h>
#include <linux/clk.h>
#include <linux/gpio/consumer.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/reset.h>
@ -190,6 +191,7 @@ struct sun8i_dw_hdmi {
struct regulator *regulator;
const struct sun8i_dw_hdmi_quirks *quirks;
struct reset_control *rst_ctrl;
struct gpio_desc *ddc_en;
};
static inline struct sun8i_dw_hdmi *