diff options
Diffstat (limited to 'drivers/gpu/drm/bridge/ti-tfp410.c')
| -rw-r--r-- | drivers/gpu/drm/bridge/ti-tfp410.c | 109 |
1 files changed, 105 insertions, 4 deletions
diff --git a/drivers/gpu/drm/bridge/ti-tfp410.c b/drivers/gpu/drm/bridge/ti-tfp410.c index 7bfb4f338813..285be4a0f4bd 100644 --- a/drivers/gpu/drm/bridge/ti-tfp410.c +++ b/drivers/gpu/drm/bridge/ti-tfp410.c @@ -27,10 +27,14 @@ struct tfp410 { struct drm_bridge bridge; struct drm_connector connector; + unsigned int connector_type; struct i2c_adapter *ddc; struct gpio_desc *hpd; struct delayed_work hpd_work; + struct gpio_desc *powerdown; + + struct drm_bridge_timings timings; struct device *dev; }; @@ -126,7 +130,7 @@ static int tfp410_attach(struct drm_bridge *bridge) drm_connector_helper_add(&dvi->connector, &tfp410_con_helper_funcs); ret = drm_connector_init(bridge->dev, &dvi->connector, - &tfp410_con_funcs, DRM_MODE_CONNECTOR_HDMIA); + &tfp410_con_funcs, dvi->connector_type); if (ret) { dev_err(dvi->dev, "drm_connector_init() failed: %d\n", ret); return ret; @@ -138,8 +142,24 @@ static int tfp410_attach(struct drm_bridge *bridge) return 0; } +static void tfp410_enable(struct drm_bridge *bridge) +{ + struct tfp410 *dvi = drm_bridge_to_tfp410(bridge); + + gpiod_set_value_cansleep(dvi->powerdown, 0); +} + +static void tfp410_disable(struct drm_bridge *bridge) +{ + struct tfp410 *dvi = drm_bridge_to_tfp410(bridge); + + gpiod_set_value_cansleep(dvi->powerdown, 1); +} + static const struct drm_bridge_funcs tfp410_bridge_funcs = { .attach = tfp410_attach, + .enable = tfp410_enable, + .disable = tfp410_disable, }; static void tfp410_hpd_work_func(struct work_struct *work) @@ -162,6 +182,70 @@ static irqreturn_t tfp410_hpd_irq_thread(int irq, void *arg) return IRQ_HANDLED; } +static const struct drm_bridge_timings tfp410_default_timings = { + .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE + | DRM_BUS_FLAG_DE_HIGH, + .setup_time_ps = 1200, + .hold_time_ps = 1300, +}; + +static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c) +{ + struct drm_bridge_timings *timings = &dvi->timings; + struct device_node *ep; + u32 pclk_sample = 0; + s32 deskew = 0; + + /* Start with defaults. */ + *timings = tfp410_default_timings; + + if (i2c) + /* + * In I2C mode timings are configured through the I2C interface. + * As the driver doesn't support I2C configuration yet, we just + * go with the defaults (BSEL=1, DSEL=1, DKEN=0, EDGE=1). + */ + return 0; + + /* + * In non-I2C mode, timings are configured through the BSEL, DSEL, DKEN + * and EDGE pins. They are specified in DT through endpoint properties + * and vendor-specific properties. + */ + ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 0, 0); + if (!ep) + return -EINVAL; + + /* Get the sampling edge from the endpoint. */ + of_property_read_u32(ep, "pclk-sample", &pclk_sample); + of_node_put(ep); + + timings->input_bus_flags = DRM_BUS_FLAG_DE_HIGH; + + switch (pclk_sample) { + case 0: + timings->input_bus_flags |= DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE + | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE; + break; + case 1: + timings->input_bus_flags |= DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE + | DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE; + break; + default: + return -EINVAL; + } + + /* Get the setup and hold time from vendor-specific properties. */ + of_property_read_u32(dvi->dev->of_node, "ti,deskew", (u32 *)&deskew); + if (deskew < -4 || deskew > 3) + return -EINVAL; + + timings->setup_time_ps = min(0, 1200 - 350 * deskew); + timings->hold_time_ps = min(0, 1300 + 350 * deskew); + + return 0; +} + static int tfp410_get_connector_properties(struct tfp410 *dvi) { struct device_node *connector_node, *ddc_phandle; @@ -172,6 +256,11 @@ static int tfp410_get_connector_properties(struct tfp410 *dvi) if (!connector_node) return -ENODEV; + if (of_device_is_compatible(connector_node, "hdmi-connector")) + dvi->connector_type = DRM_MODE_CONNECTOR_HDMIA; + else + dvi->connector_type = DRM_MODE_CONNECTOR_DVID; + dvi->hpd = fwnode_get_named_gpiod(&connector_node->fwnode, "hpd-gpios", 0, GPIOD_IN, "hpd"); if (IS_ERR(dvi->hpd)) { @@ -200,7 +289,7 @@ fail: return ret; } -static int tfp410_init(struct device *dev) +static int tfp410_init(struct device *dev, bool i2c) { struct tfp410 *dvi; int ret; @@ -217,12 +306,24 @@ static int tfp410_init(struct device *dev) dvi->bridge.funcs = &tfp410_bridge_funcs; dvi->bridge.of_node = dev->of_node; + dvi->bridge.timings = &dvi->timings; dvi->dev = dev; + ret = tfp410_parse_timings(dvi, i2c); + if (ret) + goto fail; + ret = tfp410_get_connector_properties(dvi); if (ret) goto fail; + dvi->powerdown = devm_gpiod_get_optional(dev, "powerdown", + GPIOD_OUT_HIGH); + if (IS_ERR(dvi->powerdown)) { + dev_err(dev, "failed to parse powerdown gpio\n"); + return PTR_ERR(dvi->powerdown); + } + if (dvi->hpd) { INIT_DELAYED_WORK(&dvi->hpd_work, tfp410_hpd_work_func); @@ -264,7 +365,7 @@ static int tfp410_fini(struct device *dev) static int tfp410_probe(struct platform_device *pdev) { - return tfp410_init(&pdev->dev); + return tfp410_init(&pdev->dev, false); } static int tfp410_remove(struct platform_device *pdev) @@ -301,7 +402,7 @@ static int tfp410_i2c_probe(struct i2c_client *client, return -ENXIO; } - return tfp410_init(&client->dev); + return tfp410_init(&client->dev, true); } static int tfp410_i2c_remove(struct i2c_client *client) |