Re: [PATCH v3 09/21] drm/bridge: Add a drm_bridge_state object
Hi Boris,
Thank you for the patch.
On Wed, Oct 23, 2019 at 05:45:00PM +0200, Boris Brezillon wrote:
> One of the last remaining objects to not have its atomic state.
>
> This is being motivated by our attempt to support runtime bus-format
> negotiation between elements of the bridge chain.
> This patch just paves the road for such a feature by adding a new
> drm_bridge_state object inheriting from drm_private_obj so we can
> re-use some of the existing state initialization/tracking logic.
>
> Signed-off-by: Boris Brezillon
> ---
> Changes in v3:
> * None
>
> Changes in v2:
> * Use drm_for_each_bridge_in_chain()
> * Rename helpers to be more consistent with the rest of the DRM API
> * Improve/fix the doc
> ---
> drivers/gpu/drm/drm_atomic.c| 39 +++
> drivers/gpu/drm/drm_atomic_helper.c | 20
> drivers/gpu/drm/drm_bridge.c| 168 +++-
> include/drm/drm_atomic.h| 3 +
> include/drm/drm_bridge.h| 118 +++
> 5 files changed, 343 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index 419381abbdd1..6c249ce39380 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -30,6 +30,7 @@
>
> #include
> #include
> +#include
> #include
> #include
> #include
> @@ -1010,6 +1011,44 @@ static void drm_atomic_connector_print_state(struct
> drm_printer *p,
> connector->funcs->atomic_print_state(p, state);
> }
>
> +/**
> + * drm_atomic_add_encoder_bridges - add bridges attached to an encoder
> + * @state: atomic state
> + * @encoder: DRM encoder
> + *
> + * This function adds all bridges attached to @encoder. This is needed to add
> + * bridge states to @state and make them available when
> + * _funcs.atomic_{check,pre_enable,enable,disable_post_disable}() are
> + * called
> + *
> + * Returns:
> + * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is
> EDEADLK
> + * then the w/w mutex code has detected a deadlock and the entire atomic
> + * sequence must be restarted. All other errors are fatal.
> + */
> +int
> +drm_atomic_add_encoder_bridges(struct drm_atomic_state *state,
> +struct drm_encoder *encoder)
> +{
> + struct drm_bridge_state *bridge_state;
> + struct drm_bridge *bridge;
> +
> + if (!encoder)
> + return 0;
> +
> + DRM_DEBUG_ATOMIC("Adding all bridges for [encoder:%d:%s] to %p\n",
> + encoder->base.id, encoder->name, state);
> +
> + drm_for_each_bridge_in_chain(encoder, bridge) {
> + bridge_state = drm_atomic_get_bridge_state(state, bridge);
> + if (IS_ERR(bridge_state))
> + return PTR_ERR(bridge_state);
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(drm_atomic_add_encoder_bridges);
> +
> /**
> * drm_atomic_add_affected_connectors - add connectors for crtc
> * @state: atomic state
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c
> b/drivers/gpu/drm/drm_atomic_helper.c
> index f02ddffd4960..de985ba7ce2d 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -730,6 +730,26 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
> return ret;
> }
>
> + /*
> + * Iterate over all connectors again, and add all affected bridges to
> + * the state.
> + */
> + for_each_oldnew_connector_in_state(state, connector,
> +old_connector_state,
> +new_connector_state, i) {
> + struct drm_encoder *encoder;
> +
> + encoder = old_connector_state->best_encoder;
> + ret = drm_atomic_add_encoder_bridges(state, encoder);
> + if (ret)
> + return ret;
> +
> + encoder = new_connector_state->best_encoder;
> + ret = drm_atomic_add_encoder_bridges(state, encoder);
> + if (ret)
> + return ret;
> + }
> +
> ret = mode_valid(state);
> if (ret)
> return ret;
> diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
> index c5cf8a9c4237..c53966767782 100644
> --- a/drivers/gpu/drm/drm_bridge.c
> +++ b/drivers/gpu/drm/drm_bridge.c
> @@ -25,6 +25,7 @@
> #include
> #include
>
> +#include
> #include
> #include
>
> @@ -89,6 +90,38 @@ void drm_bridge_remove(struct drm_bridge *bridge)
> }
> EXPORT_SYMBOL(drm_bridge_remove);
>
> +static struct drm_private_state *
> +drm_bridge_atomic_duplicate_priv_state(struct drm_private_obj *obj)
> +{
> + struct drm_bridge *bridge = drm_priv_to_bridge(obj);
> + struct drm_bridge_state *state;
> +
> + if (bridge->funcs->atomic_duplicate_state)
> + state = bridge->funcs->atomic_duplicate_state(bridge);
> + else
> + state =
Re: [PATCH v3 09/21] drm/bridge: Add a drm_bridge_state object
On Tue, 5 Nov 2019 17:05:16 +0100
Neil Armstrong wrote:
> > void drm_bridge_add(struct drm_bridge *bridge);
> > void drm_bridge_remove(struct drm_bridge *bridge);
> > struct drm_bridge *of_drm_find_bridge(struct device_node *np);
> > @@ -475,6 +543,56 @@ void drm_atomic_bridge_chain_pre_enable(struct
> > drm_bridge *bridge,
> > void drm_atomic_bridge_chain_enable(struct drm_bridge *bridge,
> > struct drm_atomic_state *state);
> >
> > +void __drm_atomic_helper_bridge_reset(struct drm_bridge *bridge,
> > + struct drm_bridge_state *state);
> > +struct drm_bridge_state *
> > +drm_atomic_helper_bridge_reset(struct drm_bridge *bridge);
> > +void drm_atomic_helper_bridge_destroy_state(struct drm_bridge *bridge,
> > + struct drm_bridge_state *state);
> > +void __drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge,
> > + struct drm_bridge_state *new);
> > +struct drm_bridge_state *
> > +drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge);
> > +
> > +static inline struct drm_bridge_state *
> > +drm_atomic_get_bridge_state(struct drm_atomic_state *state,
> > + struct drm_bridge *bridge)
> > +{
> > + struct drm_private_state *obj_state;
> > +
> > + obj_state = drm_atomic_get_private_obj_state(state, >base);
> > + if (!obj_state)
> > + return NULL;
>
> drm_atomic_get_private_obj_state will return an error object on error, so
> should be:
> if (IS_ERR(obj_state))
> return ERR_CAST(obj_state);
Right, I'll fix it in v4.
Thanks,
Boris
___
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
Re: [PATCH v3 09/21] drm/bridge: Add a drm_bridge_state object
On 23/10/2019 17:45, Boris Brezillon wrote:
> One of the last remaining objects to not have its atomic state.
>
> This is being motivated by our attempt to support runtime bus-format
> negotiation between elements of the bridge chain.
> This patch just paves the road for such a feature by adding a new
> drm_bridge_state object inheriting from drm_private_obj so we can
> re-use some of the existing state initialization/tracking logic.
>
> Signed-off-by: Boris Brezillon
> ---
> Changes in v3:
> * None
>
> Changes in v2:
> * Use drm_for_each_bridge_in_chain()
> * Rename helpers to be more consistent with the rest of the DRM API
> * Improve/fix the doc
> ---
> drivers/gpu/drm/drm_atomic.c| 39 +++
> drivers/gpu/drm/drm_atomic_helper.c | 20
> drivers/gpu/drm/drm_bridge.c| 168 +++-
> include/drm/drm_atomic.h| 3 +
> include/drm/drm_bridge.h| 118 +++
> 5 files changed, 343 insertions(+), 5 deletions(-)
>
[...]
> --- a/include/drm/drm_atomic.h
> +++ b/include/drm/drm_atomic.h
> @@ -660,6 +660,9 @@ __drm_atomic_get_current_plane_state(struct
> drm_atomic_state *state,
> return plane->state;
> }
>
> +int __must_check
> +drm_atomic_add_encoder_bridges(struct drm_atomic_state *state,
> +struct drm_encoder *encoder);
> int __must_check
> drm_atomic_add_affected_connectors(struct drm_atomic_state *state,
> struct drm_crtc *crtc);
> diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
> index 238e84ab63a3..a608c47d1de5 100644
> --- a/include/drm/drm_bridge.h
> +++ b/include/drm/drm_bridge.h
> @@ -25,6 +25,7 @@
>
> #include
> #include
> +#include
> #include
> #include
> #include
> @@ -33,6 +34,23 @@ struct drm_bridge;
> struct drm_bridge_timings;
> struct drm_panel;
>
> +/**
> + * struct drm_bridge_state - Atomic bridge state object
> + * @base: inherit from _private_state
> + * @bridge: the bridge this state refers to
> + */
> +struct drm_bridge_state {
> + struct drm_private_state base;
> +
> + struct drm_bridge *bridge;
> +};
> +
> +static inline struct drm_bridge_state *
> +drm_priv_to_bridge_state(struct drm_private_state *priv)
> +{
> + return container_of(priv, struct drm_bridge_state, base);
> +}
> +
> /**
> * struct drm_bridge_funcs - drm_bridge control functions
> */
> @@ -338,6 +356,48 @@ struct drm_bridge_funcs {
>*/
> void (*atomic_post_disable)(struct drm_bridge *bridge,
> struct drm_atomic_state *state);
> +
> + /**
> + * @atomic_duplicate_state:
> + *
> + * Duplicate the current bridge state object (which is guaranteed to be
> + * non-NULL).
> + *
> + * The atomic_duplicate_state() is optional, the core falls back on
> + * _atomic_helper_bridge_duplicate_state() when not implemented.
> + *
> + * RETURNS:
> + * A valid drm_bridge_state object or NULL if the allocation fails.
> + */
> + struct drm_bridge_state *(*atomic_duplicate_state)(struct drm_bridge
> *bridge);
> +
> + /**
> + * @atomic_destroy_state:
> + *
> + * Destroy a bridge state object previously allocated by
> + * _bridge_funcs.atomic_duplicate_state().
> + *
> + * The atomic_destroy_state hook is optional, the coref falls back on
> + * _atomic_helper_bridge_destroy_state() when not implemented.
> + */
> + void (*atomic_destroy_state)(struct drm_bridge *bridge,
> + struct drm_bridge_state *state);
> +
> + /**
> + * @atomic_reset:
> + *
> + * Reset the bridge to a predefined state (or retrieve its current
> + * state) and return a _bridge_state object matching this state.
> + * This function is called at attach time.
> + *
> + * The atomic_reset hook is optional, the core falls back on
> + * _atomic_helper_bridge_reset() when not implemented.
> + *
> + * RETURNS:
> + * A valid drm_bridge_state object in case of success, an ERR_PTR()
> + * giving the reaon of the failure otherwise.
> + */
> + struct drm_bridge_state *(*atomic_reset)(struct drm_bridge *bridge);
> };
>
> /**
> @@ -380,6 +440,8 @@ struct drm_bridge_timings {
> * struct drm_bridge - central DRM bridge control structure
> */
> struct drm_bridge {
> + /** @base: inherit from _private_object */
> + struct drm_private_obj base;
> /** @dev: DRM device this bridge belongs to */
> struct drm_device *dev;
> /** @encoder: encoder to which this bridge is connected */
> @@ -404,6 +466,12 @@ struct drm_bridge {
> void *driver_private;
> };
>
> +static inline struct drm_bridge *
> +drm_priv_to_bridge(struct drm_private_obj *priv)
> +{
> + return container_of(priv, struct drm_bridge, base);
> +}
> +
> void drm_bridge_add(struct drm_bridge *bridge);
> void
Re: [PATCH v3 09/21] drm/bridge: Add a drm_bridge_state object
On 23/10/2019 17:45, Boris Brezillon wrote:
> One of the last remaining objects to not have its atomic state.
>
> This is being motivated by our attempt to support runtime bus-format
> negotiation between elements of the bridge chain.
> This patch just paves the road for such a feature by adding a new
> drm_bridge_state object inheriting from drm_private_obj so we can
> re-use some of the existing state initialization/tracking logic.
>
> Signed-off-by: Boris Brezillon
> ---
> Changes in v3:
> * None
>
> Changes in v2:
> * Use drm_for_each_bridge_in_chain()
> * Rename helpers to be more consistent with the rest of the DRM API
> * Improve/fix the doc
> ---
> drivers/gpu/drm/drm_atomic.c| 39 +++
> drivers/gpu/drm/drm_atomic_helper.c | 20
> drivers/gpu/drm/drm_bridge.c| 168 +++-
> include/drm/drm_atomic.h| 3 +
> include/drm/drm_bridge.h| 118 +++
> 5 files changed, 343 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index 419381abbdd1..6c249ce39380 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -30,6 +30,7 @@
>
> #include
> #include
> +#include
> #include
> #include
> #include
> @@ -1010,6 +1011,44 @@ static void drm_atomic_connector_print_state(struct
> drm_printer *p,
> connector->funcs->atomic_print_state(p, state);
> }
>
> +/**
> + * drm_atomic_add_encoder_bridges - add bridges attached to an encoder
> + * @state: atomic state
> + * @encoder: DRM encoder
> + *
> + * This function adds all bridges attached to @encoder. This is needed to add
> + * bridge states to @state and make them available when
> + * _funcs.atomic_{check,pre_enable,enable,disable_post_disable}() are
> + * called
> + *
> + * Returns:
> + * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is
> EDEADLK
> + * then the w/w mutex code has detected a deadlock and the entire atomic
> + * sequence must be restarted. All other errors are fatal.
> + */
> +int
> +drm_atomic_add_encoder_bridges(struct drm_atomic_state *state,
> +struct drm_encoder *encoder)
> +{
> + struct drm_bridge_state *bridge_state;
> + struct drm_bridge *bridge;
> +
> + if (!encoder)
> + return 0;
> +
> + DRM_DEBUG_ATOMIC("Adding all bridges for [encoder:%d:%s] to %p\n",
> + encoder->base.id, encoder->name, state);
> +
> + drm_for_each_bridge_in_chain(encoder, bridge) {
> + bridge_state = drm_atomic_get_bridge_state(state, bridge);
> + if (IS_ERR(bridge_state))
> + return PTR_ERR(bridge_state);
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(drm_atomic_add_encoder_bridges);
> +
> /**
> * drm_atomic_add_affected_connectors - add connectors for crtc
> * @state: atomic state
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c
> b/drivers/gpu/drm/drm_atomic_helper.c
> index f02ddffd4960..de985ba7ce2d 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -730,6 +730,26 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
> return ret;
> }
>
> + /*
> + * Iterate over all connectors again, and add all affected bridges to
> + * the state.
> + */
> + for_each_oldnew_connector_in_state(state, connector,
> +old_connector_state,
> +new_connector_state, i) {
> + struct drm_encoder *encoder;
> +
> + encoder = old_connector_state->best_encoder;
> + ret = drm_atomic_add_encoder_bridges(state, encoder);
> + if (ret)
> + return ret;
> +
> + encoder = new_connector_state->best_encoder;
> + ret = drm_atomic_add_encoder_bridges(state, encoder);
> + if (ret)
> + return ret;
> + }
> +
> ret = mode_valid(state);
> if (ret)
> return ret;
> diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
> index c5cf8a9c4237..c53966767782 100644
> --- a/drivers/gpu/drm/drm_bridge.c
> +++ b/drivers/gpu/drm/drm_bridge.c
> @@ -25,6 +25,7 @@
> #include
> #include
>
> +#include
> #include
> #include
>
> @@ -89,6 +90,38 @@ void drm_bridge_remove(struct drm_bridge *bridge)
> }
> EXPORT_SYMBOL(drm_bridge_remove);
>
> +static struct drm_private_state *
> +drm_bridge_atomic_duplicate_priv_state(struct drm_private_obj *obj)
> +{
> + struct drm_bridge *bridge = drm_priv_to_bridge(obj);
> + struct drm_bridge_state *state;
> +
> + if (bridge->funcs->atomic_duplicate_state)
> + state = bridge->funcs->atomic_duplicate_state(bridge);
> + else
> + state = drm_atomic_helper_bridge_duplicate_state(bridge);
> +
> + return >base;
> +}
> +
>
