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Message-Id: <20210910101218.1632297-17-maxime@cerno.tech>
Date: Fri, 10 Sep 2021 12:12:10 +0200
From: Maxime Ripard <maxime@...no.tech>
To: Andrzej Hajda <a.hajda@...sung.com>,
Sam Ravnborg <sam@...nborg.org>,
Daniel Vetter <daniel.vetter@...el.com>,
David Airlie <airlied@...ux.ie>,
Jonas Karlman <jonas@...boo.se>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Thierry Reding <thierry.reding@...il.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Thomas Zimmermann <tzimmermann@...e.de>,
Maxime Ripard <maxime@...no.tech>,
Neil Armstrong <narmstrong@...libre.com>,
Robert Foss <robert.foss@...aro.org>,
Jernej Skrabec <jernej.skrabec@...il.com>
Cc: Sean Paul <sean@...rly.run>, freedreno@...ts.freedesktop.org,
Kyungmin Park <kyungmin.park@...sung.com>,
linux-kernel@...r.kernel.org,
Xinliang Liu <xinliang.liu@...aro.org>,
Seung-Woo Kim <sw0312.kim@...sung.com>,
Tian Tao <tiantao6@...ilicon.com>,
Inki Dae <inki.dae@...sung.com>,
linux-samsung-soc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
Rob Clark <robdclark@...il.com>,
dri-devel@...ts.freedesktop.org,
John Stultz <john.stultz@...aro.org>,
Chen Feng <puck.chen@...ilicon.com>,
Xinwei Kong <kong.kongxinwei@...ilicon.com>,
Joonyoung Shim <jy0922.shim@...sung.com>
Subject: [PATCH v4 16/24] drm/bridge: ps8640: Register and attach our DSI device at probe
In order to avoid any probe ordering issue, the best practice is to move
the secondary MIPI-DSI device registration and attachment to the
MIPI-DSI host at probe time. Let's do this.
Signed-off-by: Maxime Ripard <maxime@...no.tech>
---
drivers/gpu/drm/bridge/parade-ps8640.c | 97 +++++++++++++++-----------
1 file changed, 55 insertions(+), 42 deletions(-)
diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
index c943045f3370..8d161b6cdbb2 100644
--- a/drivers/gpu/drm/bridge/parade-ps8640.c
+++ b/drivers/gpu/drm/bridge/parade-ps8640.c
@@ -215,52 +215,10 @@ static int ps8640_bridge_attach(struct drm_bridge *bridge,
enum drm_bridge_attach_flags flags)
{
struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
- struct device *dev = &ps_bridge->page[0]->dev;
- struct device_node *in_ep, *dsi_node;
- struct mipi_dsi_device *dsi;
- struct mipi_dsi_host *host;
- int ret;
- const struct mipi_dsi_device_info info = { .type = "ps8640",
- .channel = 0,
- .node = NULL,
- };
if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
return -EINVAL;
- /* port@0 is ps8640 dsi input port */
- in_ep = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1);
- if (!in_ep)
- return -ENODEV;
-
- dsi_node = of_graph_get_remote_port_parent(in_ep);
- of_node_put(in_ep);
- if (!dsi_node)
- return -ENODEV;
-
- host = of_find_mipi_dsi_host_by_node(dsi_node);
- of_node_put(dsi_node);
- if (!host)
- return -ENODEV;
-
- dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
- if (IS_ERR(dsi)) {
- dev_err(dev, "failed to create dsi device\n");
- ret = PTR_ERR(dsi);
- return ret;
- }
-
- ps_bridge->dsi = dsi;
-
- dsi->host = host;
- dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
- MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
- dsi->format = MIPI_DSI_FMT_RGB888;
- dsi->lanes = NUM_MIPI_LANES;
- ret = devm_mipi_dsi_attach(dev, dsi);
- if (ret)
- return ret;
-
/* Attach the panel-bridge to the dsi bridge */
return drm_bridge_attach(bridge->encoder, ps_bridge->panel_bridge,
&ps_bridge->bridge, flags);
@@ -307,6 +265,53 @@ static const struct drm_bridge_funcs ps8640_bridge_funcs = {
.pre_enable = ps8640_pre_enable,
};
+static int ps8640_bridge_host_attach(struct device *dev, struct ps8640 *ps_bridge)
+{
+ struct device_node *in_ep, *dsi_node;
+ struct mipi_dsi_device *dsi;
+ struct mipi_dsi_host *host;
+ int ret;
+ const struct mipi_dsi_device_info info = { .type = "ps8640",
+ .channel = 0,
+ .node = NULL,
+ };
+
+ /* port@0 is ps8640 dsi input port */
+ in_ep = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1);
+ if (!in_ep)
+ return -ENODEV;
+
+ dsi_node = of_graph_get_remote_port_parent(in_ep);
+ of_node_put(in_ep);
+ if (!dsi_node)
+ return -ENODEV;
+
+ host = of_find_mipi_dsi_host_by_node(dsi_node);
+ of_node_put(dsi_node);
+ if (!host)
+ return -EPROBE_DEFER;
+
+ dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
+ if (IS_ERR(dsi)) {
+ dev_err(dev, "failed to create dsi device\n");
+ return PTR_ERR(dsi);
+ }
+
+ ps_bridge->dsi = dsi;
+
+ dsi->host = host;
+ dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
+ MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
+ dsi->format = MIPI_DSI_FMT_RGB888;
+ dsi->lanes = NUM_MIPI_LANES;
+
+ ret = devm_mipi_dsi_attach(dev, dsi);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
static int ps8640_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
@@ -373,7 +378,15 @@ static int ps8640_probe(struct i2c_client *client)
drm_bridge_add(&ps_bridge->bridge);
+ ret = ps8640_bridge_host_attach(dev, ps_bridge);
+ if (ret)
+ goto err_bridge_remove;
+
return 0;
+
+err_bridge_remove:
+ drm_bridge_remove(&ps_bridge->bridge);
+ return ret;
}
static int ps8640_remove(struct i2c_client *client)
--
2.31.1
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