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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 <jsarha@ti.com> Signed-off-by: Christopher Spinrath <christopher.spinrath@rwth-aachen.de> Signed-off-by: Archit Taneja <architt@codeaurora.org> Link: http://patchwork.freedesktop.org/patch/msgid/2e47786ab3d04078ae70d0c4064f7c4d@rwthex-s1-b.rwth-ad.de
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@ -8,6 +8,10 @@
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*
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*/
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#include <linux/delay.h>
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#include <linux/fwnode.h>
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#include <linux/gpio/consumer.h>
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/of_graph.h>
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#include <linux/platform_device.h>
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@ -18,11 +22,15 @@
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#include <drm/drm_crtc.h>
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#include <drm/drm_crtc_helper.h>
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#define HOTPLUG_DEBOUNCE_MS 1100
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struct tfp410 {
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struct drm_bridge bridge;
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struct drm_connector connector;
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struct i2c_adapter *ddc;
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struct gpio_desc *hpd;
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struct delayed_work hpd_work;
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struct device *dev;
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};
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@ -76,6 +84,13 @@ tfp410_connector_detect(struct drm_connector *connector, bool force)
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{
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struct tfp410 *dvi = drm_connector_to_tfp410(connector);
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if (dvi->hpd) {
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if (gpiod_get_value_cansleep(dvi->hpd))
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return connector_status_connected;
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else
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return connector_status_disconnected;
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}
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if (dvi->ddc) {
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if (drm_probe_ddc(dvi->ddc))
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return connector_status_connected;
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@ -106,6 +121,9 @@ static int tfp410_attach(struct drm_bridge *bridge)
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return -ENODEV;
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}
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if (dvi->hpd)
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dvi->connector.polled = DRM_CONNECTOR_POLL_HPD;
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drm_connector_helper_add(&dvi->connector,
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&tfp410_con_helper_funcs);
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ret = drm_connector_init(bridge->dev, &dvi->connector,
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@ -125,7 +143,27 @@ static const struct drm_bridge_funcs tfp410_bridge_funcs = {
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.attach = tfp410_attach,
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};
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static int tfp410_get_connector_ddc(struct tfp410 *dvi)
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static void tfp410_hpd_work_func(struct work_struct *work)
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{
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struct tfp410 *dvi;
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dvi = container_of(work, struct tfp410, hpd_work.work);
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if (dvi->bridge.dev)
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drm_helper_hpd_irq_event(dvi->bridge.dev);
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}
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static irqreturn_t tfp410_hpd_irq_thread(int irq, void *arg)
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{
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struct tfp410 *dvi = arg;
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mod_delayed_work(system_wq, &dvi->hpd_work,
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msecs_to_jiffies(HOTPLUG_DEBOUNCE_MS));
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return IRQ_HANDLED;
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}
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static int tfp410_get_connector_properties(struct tfp410 *dvi)
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{
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struct device_node *ep = NULL, *connector_node = NULL;
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struct device_node *ddc_phandle = NULL;
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@ -140,6 +178,17 @@ static int tfp410_get_connector_ddc(struct tfp410 *dvi)
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if (!connector_node)
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goto fail;
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dvi->hpd = fwnode_get_named_gpiod(&connector_node->fwnode,
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"hpd-gpios", 0, GPIOD_IN, "hpd");
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if (IS_ERR(dvi->hpd)) {
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ret = PTR_ERR(dvi->hpd);
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dvi->hpd = NULL;
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if (ret == -ENOENT)
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ret = 0;
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else
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goto fail;
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}
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ddc_phandle = of_parse_phandle(connector_node, "ddc-i2c-bus", 0);
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if (!ddc_phandle)
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goto fail;
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@ -176,10 +225,23 @@ static int tfp410_init(struct device *dev)
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dvi->bridge.of_node = dev->of_node;
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dvi->dev = dev;
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ret = tfp410_get_connector_ddc(dvi);
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ret = tfp410_get_connector_properties(dvi);
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if (ret)
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goto fail;
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if (dvi->hpd) {
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INIT_DELAYED_WORK(&dvi->hpd_work, tfp410_hpd_work_func);
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ret = devm_request_threaded_irq(dev, gpiod_to_irq(dvi->hpd),
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NULL, tfp410_hpd_irq_thread, IRQF_TRIGGER_RISING |
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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"hdmi-hpd", dvi);
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if (ret) {
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DRM_ERROR("failed to register hpd interrupt\n");
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goto fail;
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}
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}
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ret = drm_bridge_add(&dvi->bridge);
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if (ret) {
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dev_err(dev, "drm_bridge_add() failed: %d\n", ret);
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@ -189,6 +251,8 @@ static int tfp410_init(struct device *dev)
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return 0;
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fail:
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i2c_put_adapter(dvi->ddc);
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if (dvi->hpd)
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gpiod_put(dvi->hpd);
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return ret;
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}
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@ -196,10 +260,14 @@ static int tfp410_fini(struct device *dev)
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{
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struct tfp410 *dvi = dev_get_drvdata(dev);
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cancel_delayed_work_sync(&dvi->hpd_work);
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drm_bridge_remove(&dvi->bridge);
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if (dvi->ddc)
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i2c_put_adapter(dvi->ddc);
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if (dvi->hpd)
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gpiod_put(dvi->hpd);
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return 0;
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}
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