drm/bridge: ti-sn65dsi86: Implement bridge connector operations for DP

Implement the bridge connector-related .get_edid() and .detect()
operations for full DP mode, and report the related bridge capabilities
and type.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220831082653.20449-4-tomi.valkeinen@ideasonboard.com

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index 6e053e2af229916c21ae15c7e215948fcd326694..3c3561942eb661e807cc59013d63bf91b7f28443 100644 (file)
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -29,6 +29,7 @@
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge.h>
 #include <drm/drm_bridge_connector.h>
+#include <drm/drm_edid.h>
 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_of.h>
 #include <drm/drm_panel.h>
@@ -68,6 +69,7 @@
 #define  BPP_18_RGB                            BIT(0)
 #define SN_HPD_DISABLE_REG                     0x5C
 #define  HPD_DISABLE                           BIT(0)
+#define  HPD_DEBOUNCED_STATE                   BIT(4)
 #define SN_GPIO_IO_REG                         0x5E
 #define  SN_GPIO_INPUT_SHIFT                   4
 #define  SN_GPIO_OUTPUT_SHIFT                  0
@@ -1158,10 +1160,33 @@ static void ti_sn_bridge_atomic_post_disable(struct drm_bridge *bridge,
        pm_runtime_put_sync(pdata->dev);
 }
 
+static enum drm_connector_status ti_sn_bridge_detect(struct drm_bridge *bridge)
+{
+       struct ti_sn65dsi86 *pdata = bridge_to_ti_sn65dsi86(bridge);
+       int val = 0;
+
+       pm_runtime_get_sync(pdata->dev);
+       regmap_read(pdata->regmap, SN_HPD_DISABLE_REG, &val);
+       pm_runtime_put_autosuspend(pdata->dev);
+
+       return val & HPD_DEBOUNCED_STATE ? connector_status_connected
+                                        : connector_status_disconnected;
+}
+
+static struct edid *ti_sn_bridge_get_edid(struct drm_bridge *bridge,
+                                         struct drm_connector *connector)
+{
+       struct ti_sn65dsi86 *pdata = bridge_to_ti_sn65dsi86(bridge);
+
+       return drm_get_edid(connector, &pdata->aux.ddc);
+}
+
 static const struct drm_bridge_funcs ti_sn_bridge_funcs = {
        .attach = ti_sn_bridge_attach,
        .detach = ti_sn_bridge_detach,
        .mode_valid = ti_sn_bridge_mode_valid,
+       .get_edid = ti_sn_bridge_get_edid,
+       .detect = ti_sn_bridge_detect,
        .atomic_pre_enable = ti_sn_bridge_atomic_pre_enable,
        .atomic_enable = ti_sn_bridge_atomic_enable,
        .atomic_disable = ti_sn_bridge_atomic_disable,
@@ -1257,6 +1282,9 @@ static int ti_sn_bridge_probe(struct auxiliary_device *adev,
        pdata->bridge.type = pdata->next_bridge->type == DRM_MODE_CONNECTOR_DisplayPort
                           ? DRM_MODE_CONNECTOR_DisplayPort : DRM_MODE_CONNECTOR_eDP;
 
+       if (pdata->bridge.type == DRM_MODE_CONNECTOR_DisplayPort)
+               pdata->bridge.ops = DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_DETECT;
+
        drm_bridge_add(&pdata->bridge);
 
        ret = ti_sn_attach_host(pdata);