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Message-Id: <20250930090920.131094-8-damon.ding@rock-chips.com>
Date: Tue, 30 Sep 2025 17:09:09 +0800
From: Damon Ding <damon.ding@...k-chips.com>
To: andrzej.hajda@...el.com,
neil.armstrong@...aro.org,
rfoss@...nel.org
Cc: Laurent.pinchart@...asonboard.com,
jonas@...boo.se,
jernej.skrabec@...il.com,
maarten.lankhorst@...ux.intel.com,
mripard@...nel.org,
tzimmermann@...e.de,
airlied@...il.com,
simona@...ll.ch,
shawnguo@...nel.org,
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kernel@...gutronix.de,
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inki.dae@...sung.com,
sw0312.kim@...sung.com,
kyungmin.park@...sung.com,
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dri-devel@...ts.freedesktop.org,
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Damon Ding <damon.ding@...k-chips.com>
Subject: [PATCH v6 07/18] drm/exynos: exynos_dp: Apply legacy bridge to parse the display-timings node
If there is neither a panel nor a bridge, the display timing can be
parsed from the display-timings node under the dp node.
In order to get rid of &analogix_dp_plat_data.get_modes() and make
the codes more consistent, apply DRM legacy bridge to parse display
timings.
Signed-off-by: Damon Ding <damon.ding@...k-chips.com>
------
Changes in v6:
- Apply DRM legacy bridge to parse display timings intead of
implementing the same codes only for Exynos DP.
---
drivers/gpu/drm/exynos/Kconfig | 1 +
drivers/gpu/drm/exynos/exynos_dp.c | 71 +++++++++---------------------
2 files changed, 22 insertions(+), 50 deletions(-)
diff --git a/drivers/gpu/drm/exynos/Kconfig b/drivers/gpu/drm/exynos/Kconfig
index 0d13828e7d9e..66665d317848 100644
--- a/drivers/gpu/drm/exynos/Kconfig
+++ b/drivers/gpu/drm/exynos/Kconfig
@@ -72,6 +72,7 @@ config DRM_EXYNOS_DP
select DRM_ANALOGIX_DP
select DRM_DISPLAY_DP_HELPER
default DRM_EXYNOS
+ select DRM_LEGACY_BRIDGE
select DRM_PANEL
help
This enables support for DP device.
diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
index e20513164032..507d0a98fe5b 100644
--- a/drivers/gpu/drm/exynos/exynos_dp.c
+++ b/drivers/gpu/drm/exynos/exynos_dp.c
@@ -19,6 +19,7 @@
#include <video/videomode.h>
#include <drm/bridge/analogix_dp.h>
+#include <drm/bridge/legacy-bridge.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_crtc.h>
@@ -38,11 +39,23 @@ struct exynos_dp_device {
struct drm_device *drm_dev;
struct device *dev;
- struct videomode vm;
struct analogix_dp_device *adp;
struct analogix_dp_plat_data plat_data;
};
+static int exynos_dp_legacy_bridge_init(struct exynos_dp_device *dp,
+ struct drm_bridge **bridge)
+{
+ if (!bridge)
+ return -EINVAL;
+
+ *bridge = devm_drm_legacy_bridge(dp->dev, dp->dev->of_node, DRM_MODE_CONNECTOR_eDP);
+ if (IS_ERR(*bridge))
+ return PTR_ERR(*bridge);
+
+ return 0;
+}
+
static int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data,
bool enable)
{
@@ -67,44 +80,20 @@ static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)
return exynos_dp_crtc_clock_enable(plat_data, false);
}
-static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data,
- struct drm_connector *connector)
-{
- struct exynos_dp_device *dp = to_dp(plat_data);
- struct drm_display_mode *mode;
-
- if (dp->plat_data.panel)
- return 0;
-
- mode = drm_mode_create(connector->dev);
- if (!mode) {
- DRM_DEV_ERROR(dp->dev,
- "failed to create a new display mode.\n");
- return 0;
- }
-
- drm_display_mode_from_videomode(&dp->vm, mode);
- connector->display_info.width_mm = mode->width_mm;
- connector->display_info.height_mm = mode->height_mm;
-
- mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
- drm_mode_set_name(mode);
- drm_mode_probed_add(connector, mode);
-
- return 1;
-}
-
static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
struct drm_bridge *bridge,
struct drm_connector *connector)
{
struct exynos_dp_device *dp = to_dp(plat_data);
+ enum drm_bridge_attach_flags flags = 0;
int ret;
/* Pre-empt DP connector creation if there's a bridge */
if (plat_data->next_bridge) {
- ret = drm_bridge_attach(&dp->encoder, plat_data->next_bridge, bridge,
- 0);
+ if (drm_bridge_is_legacy(plat_data->next_bridge))
+ flags = DRM_BRIDGE_ATTACH_NO_CONNECTOR;
+
+ ret = drm_bridge_attach(&dp->encoder, plat_data->next_bridge, bridge, flags);
if (ret)
return ret;
}
@@ -129,19 +118,6 @@ static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = {
.disable = exynos_dp_nop,
};
-static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
-{
- int ret;
-
- ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE);
- if (ret) {
- DRM_DEV_ERROR(dp->dev,
- "failed: of_get_videomode() : %d\n", ret);
- return ret;
- }
- return 0;
-}
-
static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
{
struct exynos_dp_device *dp = dev_get_drvdata(dev);
@@ -151,12 +127,6 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
dp->drm_dev = drm_dev;
- if (!dp->plat_data.panel && !dp->plat_data.next_bridge) {
- ret = exynos_dp_dt_parse_panel(dp);
- if (ret)
- return ret;
- }
-
drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);
drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs);
@@ -223,6 +193,8 @@ static int exynos_dp_probe(struct platform_device *pdev)
}
ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
+ if (ret == -ENODEV)
+ ret = exynos_dp_legacy_bridge_init(dp, &bridge);
if (ret)
return ret;
@@ -233,7 +205,6 @@ static int exynos_dp_probe(struct platform_device *pdev)
dp->plat_data.power_on = exynos_dp_poweron;
dp->plat_data.power_off = exynos_dp_poweroff;
dp->plat_data.attach = exynos_dp_bridge_attach;
- dp->plat_data.get_modes = exynos_dp_get_modes;
dp->plat_data.skip_connector = !!bridge;
out:
--
2.34.1
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