From f56c9202b53be70fddc583e0f5f100e31ac6eb64 Mon Sep 17 00:00:00 2001 From: Christopher Spinrath Date: Mon, 6 Mar 2017 22:40:43 +0100 Subject: [PATCH] drm/bridge: ti-tfp410: support hpd via gpio On some boards the hpd pin of a hdmi connector is wired up to a gpio pin. Since in the DRM world the tfp410 driver is responsible for handling the connector, add support for hpd gpios in this very driver. Reviewed-by: Jyri Sarha Signed-off-by: Christopher Spinrath Signed-off-by: Archit Taneja Link: http://patchwork.freedesktop.org/patch/msgid/2e47786ab3d04078ae70d0c4064f7c4d@rwthex-s1-b.rwth-ad.de --- drivers/gpu/drm/bridge/ti-tfp410.c | 72 +++++++++++++++++++++++++++++- 1 file changed, 70 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/bridge/ti-tfp410.c b/drivers/gpu/drm/bridge/ti-tfp410.c index b379d046991b..7d519b46aee4 100644 --- a/drivers/gpu/drm/bridge/ti-tfp410.c +++ b/drivers/gpu/drm/bridge/ti-tfp410.c @@ -8,6 +8,10 @@ * */ +#include +#include +#include +#include #include #include #include @@ -18,11 +22,15 @@ #include #include +#define HOTPLUG_DEBOUNCE_MS 1100 + struct tfp410 { struct drm_bridge bridge; struct drm_connector connector; struct i2c_adapter *ddc; + struct gpio_desc *hpd; + struct delayed_work hpd_work; struct device *dev; }; @@ -76,6 +84,13 @@ tfp410_connector_detect(struct drm_connector *connector, bool force) { struct tfp410 *dvi = drm_connector_to_tfp410(connector); + if (dvi->hpd) { + if (gpiod_get_value_cansleep(dvi->hpd)) + return connector_status_connected; + else + return connector_status_disconnected; + } + if (dvi->ddc) { if (drm_probe_ddc(dvi->ddc)) return connector_status_connected; @@ -106,6 +121,9 @@ static int tfp410_attach(struct drm_bridge *bridge) return -ENODEV; } + if (dvi->hpd) + dvi->connector.polled = DRM_CONNECTOR_POLL_HPD; + drm_connector_helper_add(&dvi->connector, &tfp410_con_helper_funcs); ret = drm_connector_init(bridge->dev, &dvi->connector, @@ -125,7 +143,27 @@ static const struct drm_bridge_funcs tfp410_bridge_funcs = { .attach = tfp410_attach, }; -static int tfp410_get_connector_ddc(struct tfp410 *dvi) +static void tfp410_hpd_work_func(struct work_struct *work) +{ + struct tfp410 *dvi; + + dvi = container_of(work, struct tfp410, hpd_work.work); + + if (dvi->bridge.dev) + drm_helper_hpd_irq_event(dvi->bridge.dev); +} + +static irqreturn_t tfp410_hpd_irq_thread(int irq, void *arg) +{ + struct tfp410 *dvi = arg; + + mod_delayed_work(system_wq, &dvi->hpd_work, + msecs_to_jiffies(HOTPLUG_DEBOUNCE_MS)); + + return IRQ_HANDLED; +} + +static int tfp410_get_connector_properties(struct tfp410 *dvi) { struct device_node *ep = NULL, *connector_node = NULL; struct device_node *ddc_phandle = NULL; @@ -140,6 +178,17 @@ static int tfp410_get_connector_ddc(struct tfp410 *dvi) if (!connector_node) goto fail; + dvi->hpd = fwnode_get_named_gpiod(&connector_node->fwnode, + "hpd-gpios", 0, GPIOD_IN, "hpd"); + if (IS_ERR(dvi->hpd)) { + ret = PTR_ERR(dvi->hpd); + dvi->hpd = NULL; + if (ret == -ENOENT) + ret = 0; + else + goto fail; + } + ddc_phandle = of_parse_phandle(connector_node, "ddc-i2c-bus", 0); if (!ddc_phandle) goto fail; @@ -176,10 +225,23 @@ static int tfp410_init(struct device *dev) dvi->bridge.of_node = dev->of_node; dvi->dev = dev; - ret = tfp410_get_connector_ddc(dvi); + ret = tfp410_get_connector_properties(dvi); if (ret) goto fail; + if (dvi->hpd) { + INIT_DELAYED_WORK(&dvi->hpd_work, tfp410_hpd_work_func); + + ret = devm_request_threaded_irq(dev, gpiod_to_irq(dvi->hpd), + NULL, tfp410_hpd_irq_thread, IRQF_TRIGGER_RISING | + IRQF_TRIGGER_FALLING | IRQF_ONESHOT, + "hdmi-hpd", dvi); + if (ret) { + DRM_ERROR("failed to register hpd interrupt\n"); + goto fail; + } + } + ret = drm_bridge_add(&dvi->bridge); if (ret) { dev_err(dev, "drm_bridge_add() failed: %d\n", ret); @@ -189,6 +251,8 @@ static int tfp410_init(struct device *dev) return 0; fail: i2c_put_adapter(dvi->ddc); + if (dvi->hpd) + gpiod_put(dvi->hpd); return ret; } @@ -196,10 +260,14 @@ static int tfp410_fini(struct device *dev) { struct tfp410 *dvi = dev_get_drvdata(dev); + cancel_delayed_work_sync(&dvi->hpd_work); + drm_bridge_remove(&dvi->bridge); if (dvi->ddc) i2c_put_adapter(dvi->ddc); + if (dvi->hpd) + gpiod_put(dvi->hpd); return 0; } -- 2.20.1