diff options
Diffstat (limited to 'drivers/gpu/drm/tilcdc/tilcdc_external.c')
| -rw-r--r-- | drivers/gpu/drm/tilcdc/tilcdc_external.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_external.c b/drivers/gpu/drm/tilcdc/tilcdc_external.c new file mode 100644 index 000000000..8ece0dd0b --- /dev/null +++ b/drivers/gpu/drm/tilcdc/tilcdc_external.c @@ -0,0 +1,181 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2015 Texas Instruments + * Author: Jyri Sarha <jsarha@ti.com> + */ + +#include <linux/component.h> +#include <linux/of_graph.h> + +#include <drm/drm_atomic_helper.h> +#include <drm/drm_bridge.h> +#include <drm/drm_of.h> +#include <drm/drm_simple_kms_helper.h> + +#include "tilcdc_drv.h" +#include "tilcdc_external.h" + +static const struct tilcdc_panel_info panel_info_tda998x = { + .ac_bias = 255, + .ac_bias_intrpt = 0, + .dma_burst_sz = 16, + .bpp = 16, + .fdd = 0x80, + .tft_alt_mode = 0, + .invert_pxl_clk = 1, + .sync_edge = 1, + .sync_ctrl = 1, + .raster_order = 0, +}; + +static const struct tilcdc_panel_info panel_info_default = { + .ac_bias = 255, + .ac_bias_intrpt = 0, + .dma_burst_sz = 16, + .bpp = 16, + .fdd = 0x80, + .tft_alt_mode = 0, + .sync_edge = 0, + .sync_ctrl = 1, + .raster_order = 0, +}; + +static +struct drm_connector *tilcdc_encoder_find_connector(struct drm_device *ddev, + struct drm_encoder *encoder) +{ + struct drm_connector *connector; + + list_for_each_entry(connector, &ddev->mode_config.connector_list, head) { + if (drm_connector_has_possible_encoder(connector, encoder)) + return connector; + } + + dev_err(ddev->dev, "No connector found for %s encoder (id %d)\n", + encoder->name, encoder->base.id); + + return NULL; +} + +int tilcdc_add_component_encoder(struct drm_device *ddev) +{ + struct tilcdc_drm_private *priv = ddev->dev_private; + struct drm_encoder *encoder = NULL, *iter; + + list_for_each_entry(iter, &ddev->mode_config.encoder_list, head) + if (iter->possible_crtcs & (1 << priv->crtc->index)) { + encoder = iter; + break; + } + + if (!encoder) { + dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__); + return -ENODEV; + } + + priv->external_connector = + tilcdc_encoder_find_connector(ddev, encoder); + + if (!priv->external_connector) + return -ENODEV; + + /* Only tda998x is supported at the moment. */ + tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true); + tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x); + + return 0; +} + +static +int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge) +{ + struct tilcdc_drm_private *priv = ddev->dev_private; + int ret; + + priv->external_encoder->possible_crtcs = BIT(0); + + ret = drm_bridge_attach(priv->external_encoder, bridge, NULL, 0); + if (ret) { + dev_err(ddev->dev, "drm_bridge_attach() failed %d\n", ret); + return ret; + } + + tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_default); + + priv->external_connector = + tilcdc_encoder_find_connector(ddev, priv->external_encoder); + if (!priv->external_connector) + return -ENODEV; + + return 0; +} + +int tilcdc_attach_external_device(struct drm_device *ddev) +{ + struct tilcdc_drm_private *priv = ddev->dev_private; + struct drm_bridge *bridge; + struct drm_panel *panel; + int ret; + + ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0, + &panel, &bridge); + if (ret == -ENODEV) + return 0; + else if (ret) + return ret; + + priv->external_encoder = devm_kzalloc(ddev->dev, + sizeof(*priv->external_encoder), + GFP_KERNEL); + if (!priv->external_encoder) + return -ENOMEM; + + ret = drm_simple_encoder_init(ddev, priv->external_encoder, + DRM_MODE_ENCODER_NONE); + if (ret) { + dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret); + return ret; + } + + if (panel) { + bridge = devm_drm_panel_bridge_add_typed(ddev->dev, panel, + DRM_MODE_CONNECTOR_DPI); + if (IS_ERR(bridge)) { + ret = PTR_ERR(bridge); + goto err_encoder_cleanup; + } + } + + ret = tilcdc_attach_bridge(ddev, bridge); + if (ret) + goto err_encoder_cleanup; + + return 0; + +err_encoder_cleanup: + drm_encoder_cleanup(priv->external_encoder); + return ret; +} + +static int dev_match_of(struct device *dev, void *data) +{ + return dev->of_node == data; +} + +int tilcdc_get_external_components(struct device *dev, + struct component_match **match) +{ + struct device_node *node; + + node = of_graph_get_remote_node(dev->of_node, 0, 0); + + if (!of_device_is_compatible(node, "nxp,tda998x")) { + of_node_put(node); + return 0; + } + + if (match) + drm_of_component_match_add(dev, match, dev_match_of, node); + of_node_put(node); + return 1; +} |