drm/bridge: nxp-ptn3460: add get_edid bridge operation

Add the get_edid() bridge operation to prepare for
use as a chained bridge.
Add helper function that is also used by the connector.

v2:
  - Fix memory leak (Laurent)
  - Do not save a copy of edid, read it when needed

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: Jonas Karlman <jonas@kwiboo.se>
Cc: Jernej Skrabec <jernej.skrabec@siol.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20200727170320.959777-5-sam@ravnborg.org

diff --git a/drivers/gpu/drm/bridge/nxp-ptn3460.c b/drivers/gpu/drm/bridge/nxp-ptn3460.c
index 438e566..2805c89 100644 (file)
--- a/drivers/gpu/drm/bridge/nxp-ptn3460.c
+++ b/drivers/gpu/drm/bridge/nxp-ptn3460.c
@@ -29,7 +29,6 @@ struct ptn3460_bridge {
        struct drm_connector connector;
        struct i2c_client *client;
        struct drm_bridge bridge;
-       struct edid *edid;
        struct drm_panel *panel;
        struct gpio_desc *gpio_pd_n;
        struct gpio_desc *gpio_rst_n;
@@ -184,17 +183,13 @@ static void ptn3460_post_disable(struct drm_bridge *bridge)
        }
 }
 
-static int ptn3460_get_modes(struct drm_connector *connector)
+static struct edid *ptn3460_get_edid(struct drm_bridge *bridge,
+                                    struct drm_connector *connector)
 {
-       struct ptn3460_bridge *ptn_bridge;
-       u8 *edid;
-       int ret, num_modes = 0;
+       struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
        bool power_off;
-
-       ptn_bridge = connector_to_ptn3460(connector);
-
-       if (ptn_bridge->edid)
-               return drm_add_edid_modes(connector, ptn_bridge->edid);
+       u8 *edid;
+       int ret;
 
        power_off = !ptn_bridge->enabled;
        ptn3460_pre_enable(&ptn_bridge->bridge);
@@ -202,30 +197,40 @@ static int ptn3460_get_modes(struct drm_connector *connector)
        edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
        if (!edid) {
                DRM_ERROR("Failed to allocate EDID\n");
-               return 0;
+               goto out;
        }
 
        ret = ptn3460_read_bytes(ptn_bridge, PTN3460_EDID_ADDR, edid,
-                       EDID_LENGTH);
+                                EDID_LENGTH);
        if (ret) {
                kfree(edid);
+               edid = NULL;
                goto out;
        }
 
-       ptn_bridge->edid = (struct edid *)edid;
-       drm_connector_update_edid_property(connector, ptn_bridge->edid);
-
-       num_modes = drm_add_edid_modes(connector, ptn_bridge->edid);
-
 out:
        if (power_off)
                ptn3460_disable(&ptn_bridge->bridge);
 
+       return (struct edid *)edid;
+}
+
+static int ptn3460_connector_get_modes(struct drm_connector *connector)
+{
+       struct ptn3460_bridge *ptn_bridge = connector_to_ptn3460(connector);
+       struct edid *edid;
+       int num_modes;
+
+       edid = ptn3460_get_edid(&ptn_bridge->bridge, connector);
+       drm_connector_update_edid_property(connector, edid);
+       num_modes = drm_add_edid_modes(connector, edid);
+       kfree(edid);
+
        return num_modes;
 }
 
 static const struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
-       .get_modes = ptn3460_get_modes,
+       .get_modes = ptn3460_connector_get_modes,
 };
 
 static const struct drm_connector_funcs ptn3460_connector_funcs = {
@@ -279,6 +284,7 @@ static const struct drm_bridge_funcs ptn3460_bridge_funcs = {
        .disable = ptn3460_disable,
        .post_disable = ptn3460_post_disable,
        .attach = ptn3460_bridge_attach,
+       .get_edid = ptn3460_get_edid,
 };
 
 static int ptn3460_probe(struct i2c_client *client,
@@ -327,6 +333,7 @@ static int ptn3460_probe(struct i2c_client *client,
        }
 
        ptn_bridge->bridge.funcs = &ptn3460_bridge_funcs;
+       ptn_bridge->bridge.ops = DRM_BRIDGE_OP_EDID;
        ptn_bridge->bridge.of_node = dev->of_node;
        drm_bridge_add(&ptn_bridge->bridge);