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drm/bridge: nxp-ptn3460: add drm_panel_bridge support

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Prepare the bridge driver for use in a chained setup.

- Replacing direct use of drm_panel with drm_panel_bridge support.
- Make the connector creation optional

Note: the bridge panel will use the connector type from the panel.

v3:
  - Fix wrong logic in connector creation (Laurent)

v2:
  - Use panel_bridge for local variable name to align with other drivers
  - Fix that connector was created twice (Laurent)
  - Set bridge.type to DRM_MODE_CONNECTOR_LVDS.

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/20200727170320.959777-6-sam@ravnborg.org
This commit is contained in:
Sam Ravnborg 2020-07-27 19:03:20 +02:00
parent 4151c14cdd
commit 8f22c21dce
1 changed files with 18 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
drivers/gpu/drm/bridge/nxp-ptn3460.c
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@ -29,7 +29,7 @@ struct ptn3460_bridge {
struct drm_connector connector;
struct i2c_client *client;
struct drm_bridge bridge;
struct drm_panel *panel;
struct drm_bridge *panel_bridge;
struct gpio_desc *gpio_pd_n;
struct gpio_desc *gpio_rst_n;
u32 edid_emulation;
@ -126,11 +126,6 @@ static void ptn3460_pre_enable(struct drm_bridge *bridge)
usleep_range(10, 20);
gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
if (drm_panel_prepare(ptn_bridge->panel)) {
DRM_ERROR("failed to prepare panel\n");
return;
}
/*
* There's a bug in the PTN chip where it falsely asserts hotplug before
* it is fully functional. We're forced to wait for the maximum start up
@ -145,16 +140,6 @@ static void ptn3460_pre_enable(struct drm_bridge *bridge)
ptn_bridge->enabled = true;
}
static void ptn3460_enable(struct drm_bridge *bridge)
{
struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
if (drm_panel_enable(ptn_bridge->panel)) {
DRM_ERROR("failed to enable panel\n");
return;
}
}
static void ptn3460_disable(struct drm_bridge *bridge)
{
struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
@ -164,24 +149,10 @@ static void ptn3460_disable(struct drm_bridge *bridge)
ptn_bridge->enabled = false;
if (drm_panel_disable(ptn_bridge->panel)) {
DRM_ERROR("failed to disable panel\n");
return;
}
gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
gpiod_set_value(ptn_bridge->gpio_pd_n, 0);
}
static void ptn3460_post_disable(struct drm_bridge *bridge)
{
struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
if (drm_panel_unprepare(ptn_bridge->panel)) {
DRM_ERROR("failed to unprepare panel\n");
return;
}
}
static struct edid *ptn3460_get_edid(struct drm_bridge *bridge,
struct drm_connector *connector)
@ -247,10 +218,14 @@ static int ptn3460_bridge_attach(struct drm_bridge *bridge,
struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
int ret;
if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
DRM_ERROR("Fix bridge driver to make connector optional!");
return -EINVAL;
}
/* Let this driver create connector if requested */
ret = drm_bridge_attach(bridge->encoder, ptn_bridge->panel_bridge,
bridge, flags | DRM_BRIDGE_ATTACH_NO_CONNECTOR);
if (ret < 0)
return ret;
if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
return 0;
if (!bridge->encoder) {
DRM_ERROR("Parent encoder object not found");
@ -270,9 +245,6 @@ static int ptn3460_bridge_attach(struct drm_bridge *bridge,
drm_connector_attach_encoder(&ptn_bridge->connector,
bridge->encoder);
if (ptn_bridge->panel)
drm_panel_attach(ptn_bridge->panel, &ptn_bridge->connector);
drm_helper_hpd_irq_event(ptn_bridge->connector.dev);
return ret;
@ -280,9 +252,7 @@ static int ptn3460_bridge_attach(struct drm_bridge *bridge,
static const struct drm_bridge_funcs ptn3460_bridge_funcs = {
.pre_enable = ptn3460_pre_enable,
.enable = ptn3460_enable,
.disable = ptn3460_disable,
.post_disable = ptn3460_post_disable,
.attach = ptn3460_bridge_attach,
.get_edid = ptn3460_get_edid,
};
@ -292,6 +262,8 @@ static int ptn3460_probe(struct i2c_client *client,
{
struct device *dev = &client->dev;
struct ptn3460_bridge *ptn_bridge;
struct drm_bridge *panel_bridge;
struct drm_panel *panel;
int ret;
ptn_bridge = devm_kzalloc(dev, sizeof(*ptn_bridge), GFP_KERNEL);
@ -299,10 +271,15 @@ static int ptn3460_probe(struct i2c_client *client,
return -ENOMEM;
}
ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ptn_bridge->panel, NULL);
ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, NULL);
if (ret)
return ret;
panel_bridge = devm_drm_panel_bridge_add(dev, panel);
if (IS_ERR(panel_bridge))
return PTR_ERR(panel_bridge);
ptn_bridge->panel_bridge = panel_bridge;
ptn_bridge->client = client;
ptn_bridge->gpio_pd_n = devm_gpiod_get(&client->dev, "powerdown",
@ -334,6 +311,7 @@ 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.type = DRM_MODE_CONNECTOR_LVDS;
ptn_bridge->bridge.of_node = dev->of_node;
drm_bridge_add(&ptn_bridge->bridge);