By depending on devm_drm_panel_bridge_add(), devm_drm_of_get_bridge() introduces a circular dependency between the modules drm (where devm_drm_of_get_bridge() ends up) and drm_kms_helper (where devm_drm_panel_bridge_add() is).
Fix this by moving devm_drm_of_get_bridge() to bridge/panel.c and thus drm_kms_helper.
Fixes: 87ea95808d53 ("drm/bridge: Add a function to abstract away panels") Reported-by: Stephen Rothwell sfr@canb.auug.org.au Signed-off-by: Maxime Ripard maxime@cerno.tech
---
Hi Stephen,
I think it fixes the issue, but couldn't reproduce it here with my config for some reason.
Let me know if it works for you.
Maxime --- drivers/gpu/drm/bridge/panel.c | 36 ++++++++++++++++++++++++++++++++++ drivers/gpu/drm/drm_bridge.c | 34 -------------------------------- 2 files changed, 36 insertions(+), 34 deletions(-)
diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c index c916f4b8907e..285a079cdef5 100644 --- a/drivers/gpu/drm/bridge/panel.c +++ b/drivers/gpu/drm/bridge/panel.c @@ -332,3 +332,39 @@ struct drm_connector *drm_panel_bridge_connector(struct drm_bridge *bridge) return &panel_bridge->connector; } EXPORT_SYMBOL(drm_panel_bridge_connector); + +#ifdef CONFIG_OF +/** + * devm_drm_of_get_bridge - Return next bridge in the chain + * @dev: device to tie the bridge lifetime to + * @np: device tree node containing encoder output ports + * @port: port in the device tree node + * @endpoint: endpoint in the device tree node + * + * Given a DT node's port and endpoint number, finds the connected node + * and returns the associated bridge if any, or creates and returns a + * drm panel bridge instance if a panel is connected. + * + * Returns a pointer to the bridge if successful, or an error pointer + * otherwise. + */ +struct drm_bridge *devm_drm_of_get_bridge(struct device *dev, + struct device_node *np, + u32 port, u32 endpoint) +{ + struct drm_bridge *bridge; + struct drm_panel *panel; + int ret; + + ret = drm_of_find_panel_or_bridge(np, port, endpoint, + &panel, &bridge); + if (ret) + return ERR_PTR(ret); + + if (panel) + bridge = devm_drm_panel_bridge_add(dev, panel); + + return bridge; +} +EXPORT_SYMBOL(devm_drm_of_get_bridge); +#endif diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c index 4c68733fa660..7ee29f073857 100644 --- a/drivers/gpu/drm/drm_bridge.c +++ b/drivers/gpu/drm/drm_bridge.c @@ -1232,40 +1232,6 @@ struct drm_bridge *of_drm_find_bridge(struct device_node *np) return NULL; } EXPORT_SYMBOL(of_drm_find_bridge); - -/** - * devm_drm_of_get_bridge - Return next bridge in the chain - * @dev: device to tie the bridge lifetime to - * @np: device tree node containing encoder output ports - * @port: port in the device tree node - * @endpoint: endpoint in the device tree node - * - * Given a DT node's port and endpoint number, finds the connected node - * and returns the associated bridge if any, or creates and returns a - * drm panel bridge instance if a panel is connected. - * - * Returns a pointer to the bridge if successful, or an error pointer - * otherwise. - */ -struct drm_bridge *devm_drm_of_get_bridge(struct device *dev, - struct device_node *np, - u32 port, u32 endpoint) -{ - struct drm_bridge *bridge; - struct drm_panel *panel; - int ret; - - ret = drm_of_find_panel_or_bridge(np, port, endpoint, - &panel, &bridge); - if (ret) - return ERR_PTR(ret); - - if (panel) - bridge = devm_drm_panel_bridge_add(dev, panel); - - return bridge; -} -EXPORT_SYMBOL(devm_drm_of_get_bridge); #endif
MODULE_AUTHOR("Ajay Kumar ajaykumar.rs@samsung.com");