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drm/bridge: display-connector: add DP support

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Add DP support to display-connector driver. The driver will support HPD
via a GPIO and DP PWR.

DP PWR will be enabled at probe, which is not optimal, but I'm not sure
what would be a good place to enable and disable DP PWR. Perhaps
attach/detach, but I don't know if enabling HW is something that attach
is supposed to do.

In any case, I don't think there's much difference in power consumption
between the version in this patch and enabling the regulator later: if
the driver probes, supposedly it will attach very soon afterwards, and
we need to enable the DP PWR as soon as possible.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201130112919.241054-3-tomi.valkeinen@ti.com
This commit is contained in:
Tomi Valkeinen 2020-11-30 13:29:19 +02:00
parent a46c112512
commit 2e2bf3a558
1 changed files with 44 additions and 2 deletions
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46
drivers/gpu/drm/bridge/display-connector.c
View File

@ -11,6 +11,7 @@
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <drm/drm_bridge.h>
#include <drm/drm_edid.h>
@ -20,6 +21,8 @@ struct display_connector {
struct gpio_desc *hpd_gpio;
int hpd_irq;
struct regulator *dp_pwr;
};
static inline struct display_connector *
@ -172,11 +175,12 @@ static int display_connector_probe(struct platform_device *pdev)
of_property_read_string(pdev->dev.of_node, "label", &label);
/*
* Get the HPD GPIO for DVI and HDMI connectors. If the GPIO can provide
* Get the HPD GPIO for DVI, HDMI and DP connectors. If the GPIO can provide
* edge interrupts, register an interrupt handler.
*/
if (type == DRM_MODE_CONNECTOR_DVII ||
type == DRM_MODE_CONNECTOR_HDMIA) {
type == DRM_MODE_CONNECTOR_HDMIA ||
type == DRM_MODE_CONNECTOR_DisplayPort) {
conn->hpd_gpio = devm_gpiod_get_optional(&pdev->dev, "hpd",
GPIOD_IN);
if (IS_ERR(conn->hpd_gpio)) {
@ -223,6 +227,38 @@ static int display_connector_probe(struct platform_device *pdev)
}
}
/* Get the DP PWR for DP connector. */
if (type == DRM_MODE_CONNECTOR_DisplayPort) {
int ret;
conn->dp_pwr = devm_regulator_get_optional(&pdev->dev, "dp-pwr");
if (IS_ERR(conn->dp_pwr)) {
ret = PTR_ERR(conn->dp_pwr);
switch (ret) {
case -ENODEV:
conn->dp_pwr = NULL;
break;
case -EPROBE_DEFER:
return -EPROBE_DEFER;
default:
dev_err(&pdev->dev, "failed to get DP PWR regulator: %d\n", ret);
return ret;
}
}
if (conn->dp_pwr) {
ret = regulator_enable(conn->dp_pwr);
if (ret) {
dev_err(&pdev->dev, "failed to enable DP PWR regulator: %d\n", ret);
return ret;
}
}
}
conn->bridge.funcs = &display_connector_bridge_funcs;
conn->bridge.of_node = pdev->dev.of_node;
@ -251,6 +287,9 @@ static int display_connector_remove(struct platform_device *pdev)
{
struct display_connector *conn = platform_get_drvdata(pdev);
if (conn->dp_pwr)
regulator_disable(conn->dp_pwr);
drm_bridge_remove(&conn->bridge);
if (!IS_ERR(conn->bridge.ddc))
@ -275,6 +314,9 @@ static const struct of_device_id display_connector_match[] = {
}, {
.compatible = "vga-connector",
.data = (void *)DRM_MODE_CONNECTOR_VGA,
}, {
.compatible = "dp-connector",
.data = (void *)DRM_MODE_CONNECTOR_DisplayPort,
},
{},
};