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Date: Thu, 28 Oct 2021 10:58:11 -0700
From: Philip Chen <philipchen@...omium.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: swboyd@...omium.org, dianders@...omium.org,
Philip Chen <philipchen@...omium.org>,
Andrzej Hajda <a.hajda@...sung.com>,
Daniel Vetter <daniel@...ll.ch>,
David Airlie <airlied@...ux.ie>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Jonas Karlman <jonas@...boo.se>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Neil Armstrong <narmstrong@...libre.com>,
Robert Foss <robert.foss@...aro.org>,
dri-devel@...ts.freedesktop.org
Subject: [PATCH v5 2/2] drm/bridge: parade-ps8640: Populate devices on aux-bus
Conventionally, panel is listed under the root of the device tree.
When userland asks for display mode, ps8640 bridge is responsible
for returning EDID when ps8640_bridge_get_edid() is called.
Now enable a new option of listing panel under "aux-bus" of ps8640
bridge node in the device tree. In this case, panel driver can retrieve
EDID by triggering AUX transactions, without ps8640_bridge_get_edid()
calls at all.
To prevent the "old" and "new" options from interfering with each
other's logic flow, disable DRM_BRIDGE_OP_EDID when the new option
is taken.
Signed-off-by: Philip Chen <philipchen@...omium.org>
Reviewed-by: Stephen Boyd <swboyd@...omium.org>
---
In v4, I factored out the "ps8640_ensure_hpd" change and added it to patch 1/2
in this patch series. But I forgot to mention it in v4 change log. Edit v4
change log retroactively.
In v3, I factored out the "put_sync_suspend" change and added it to patch 1/2
in this patch series. But I forgot to mention it in v3 change log. Edit v3
change log retroactively.
(no changes since v4)
Changes in v4:
- Move the change of "ps8640_ensure_hpd" to patch 1/2 in this patch series.
Changes in v3:
- Fix when to call of_node_put() in ps8640_of_panel_on_aux_bus()
- Move the change of "put_sync_suspend" to patch 1/2 in this patch series.
Changes in v2:
- Add of_node_put() calls in ps8640_of_panel_on_aux_bus()
- Select DRM_DP_AUX_BUS for PS8640 driver in Kconfig
drivers/gpu/drm/bridge/Kconfig | 1 +
drivers/gpu/drm/bridge/parade-ps8640.c | 51 ++++++++++++++++++++------
2 files changed, 40 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 431b6e12a81f..61db5a66b493 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -182,6 +182,7 @@ config DRM_PARADE_PS8622
config DRM_PARADE_PS8640
tristate "Parade PS8640 MIPI DSI to eDP Converter"
depends on OF
+ select DRM_DP_AUX_BUS
select DRM_KMS_HELPER
select DRM_MIPI_DSI
select DRM_PANEL
diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
index 63a817d92c1d..448988d9eb41 100644
--- a/drivers/gpu/drm/bridge/parade-ps8640.c
+++ b/drivers/gpu/drm/bridge/parade-ps8640.c
@@ -14,6 +14,7 @@
#include <linux/regulator/consumer.h>
#include <drm/drm_bridge.h>
+#include <drm/drm_dp_aux_bus.h>
#include <drm/drm_dp_helper.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_of.h>
@@ -149,6 +150,23 @@ static inline struct ps8640 *aux_to_ps8640(struct drm_dp_aux *aux)
return container_of(aux, struct ps8640, aux);
}
+static bool ps8640_of_panel_on_aux_bus(struct device *dev)
+{
+ struct device_node *bus, *panel;
+
+ bus = of_get_child_by_name(dev->of_node, "aux-bus");
+ if (!bus)
+ return false;
+
+ panel = of_get_child_by_name(bus, "panel");
+ of_node_put(bus);
+ if (!panel)
+ return false;
+ of_node_put(panel);
+
+ return true;
+}
+
static int ps8640_ensure_hpd(struct ps8640 *ps_bridge)
{
struct regmap *map = ps_bridge->regmap[PAGE2_TOP_CNTL];
@@ -555,17 +573,6 @@ static int ps8640_probe(struct i2c_client *client)
if (!ps_bridge)
return -ENOMEM;
- /* port@1 is ps8640 output port */
- ret = drm_of_find_panel_or_bridge(np, 1, 0, &panel, NULL);
- if (ret < 0)
- return ret;
- if (!panel)
- return -ENODEV;
-
- ps_bridge->panel_bridge = devm_drm_panel_bridge_add(dev, panel);
- if (IS_ERR(ps_bridge->panel_bridge))
- return PTR_ERR(ps_bridge->panel_bridge);
-
ps_bridge->supplies[0].supply = "vdd33";
ps_bridge->supplies[1].supply = "vdd12";
ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ps_bridge->supplies),
@@ -588,9 +595,16 @@ static int ps8640_probe(struct i2c_client *client)
ps_bridge->bridge.funcs = &ps8640_bridge_funcs;
ps_bridge->bridge.of_node = dev->of_node;
- ps_bridge->bridge.ops = DRM_BRIDGE_OP_EDID;
ps_bridge->bridge.type = DRM_MODE_CONNECTOR_eDP;
+ /*
+ * In the device tree, if panel is listed under aux-bus of the bridge
+ * node, panel driver should be able to retrieve EDID by itself using
+ * aux-bus. So let's not set DRM_BRIDGE_OP_EDID here.
+ */
+ if (!ps8640_of_panel_on_aux_bus(&client->dev))
+ ps_bridge->bridge.ops = DRM_BRIDGE_OP_EDID;
+
ps_bridge->page[PAGE0_DP_CNTL] = client;
ps_bridge->regmap[PAGE0_DP_CNTL] = devm_regmap_init_i2c(client, ps8640_regmap_config);
@@ -633,6 +647,19 @@ static int ps8640_probe(struct i2c_client *client)
if (ret)
return ret;
+ devm_of_dp_aux_populate_ep_devices(&ps_bridge->aux);
+
+ /* port@1 is ps8640 output port */
+ ret = drm_of_find_panel_or_bridge(np, 1, 0, &panel, NULL);
+ if (ret < 0)
+ return ret;
+ if (!panel)
+ return -ENODEV;
+
+ ps_bridge->panel_bridge = devm_drm_panel_bridge_add(dev, panel);
+ if (IS_ERR(ps_bridge->panel_bridge))
+ return PTR_ERR(ps_bridge->panel_bridge);
+
drm_bridge_add(&ps_bridge->bridge);
ret = ps8640_bridge_host_attach(dev, ps_bridge);
--
2.33.0.1079.g6e70778dc9-goog
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