[PATCH v3 10/21] drm/bridge: Clarify the atomic enable/disable hooks semantics
Laurent Pinchart
laurent.pinchart at ideasonboard.com
Mon Dec 2 16:50:39 UTC 2019
Hi Boris,
Thank you for the patch.
On Wed, Oct 23, 2019 at 05:45:01PM +0200, Boris Brezillon wrote:
> The [pre_]enable/[post_]disable hooks are passed the old atomic state.
> Update the doc and rename the arguments to make it clear.
>
> Signed-off-by: Boris Brezillon <boris.brezillon at collabora.com>
> ---
> Changes in v3:
> * New patch
> ---
> drivers/gpu/drm/drm_bridge.c | 24 ++++++++++++------------
> include/drm/drm_bridge.h | 16 ++++++++++++----
> 2 files changed, 24 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
> index c53966767782..ca74bfe028c9 100644
> --- a/drivers/gpu/drm/drm_bridge.c
> +++ b/drivers/gpu/drm/drm_bridge.c
> @@ -447,7 +447,7 @@ EXPORT_SYMBOL(drm_bridge_chain_enable);
> /**
> * drm_atomic_bridge_chain_disable - disables all bridges in the encoder chain
> * @bridge: bridge control structure
> - * @state: atomic state being committed
> + * @old_state: old atomic state
> *
> * Calls &drm_bridge_funcs.atomic_disable (falls back on
> * &drm_bridge_funcs.disable) op for all the bridges in the encoder chain,
> @@ -457,7 +457,7 @@ EXPORT_SYMBOL(drm_bridge_chain_enable);
> * Note: the bridge passed should be the one closest to the encoder
> */
> void drm_atomic_bridge_chain_disable(struct drm_bridge *bridge,
> - struct drm_atomic_state *state)
> + struct drm_atomic_state *old_state)
> {
> struct drm_encoder *encoder;
> struct drm_bridge *iter;
> @@ -469,7 +469,7 @@ void drm_atomic_bridge_chain_disable(struct drm_bridge *bridge,
> list_for_each_entry_reverse(iter, &encoder->bridge_chain,
> chain_node) {
> if (iter->funcs->atomic_disable)
> - iter->funcs->atomic_disable(iter, state);
> + iter->funcs->atomic_disable(iter, old_state);
> else if (iter->funcs->disable)
> iter->funcs->disable(iter);
>
> @@ -483,7 +483,7 @@ EXPORT_SYMBOL(drm_atomic_bridge_chain_disable);
> * drm_atomic_bridge_chain_post_disable - cleans up after disabling all bridges
> * in the encoder chain
> * @bridge: bridge control structure
> - * @state: atomic state being committed
> + * @old_state: old atomic state
> *
> * Calls &drm_bridge_funcs.atomic_post_disable (falls back on
> * &drm_bridge_funcs.post_disable) op for all the bridges in the encoder chain,
> @@ -493,7 +493,7 @@ EXPORT_SYMBOL(drm_atomic_bridge_chain_disable);
> * Note: the bridge passed should be the one closest to the encoder
> */
> void drm_atomic_bridge_chain_post_disable(struct drm_bridge *bridge,
> - struct drm_atomic_state *state)
> + struct drm_atomic_state *old_state)
> {
> struct drm_encoder *encoder;
>
> @@ -504,7 +504,7 @@ void drm_atomic_bridge_chain_post_disable(struct drm_bridge *bridge,
> list_for_each_entry_from(bridge, &encoder->bridge_chain,
> chain_node) {
> if (bridge->funcs->atomic_post_disable)
> - bridge->funcs->atomic_post_disable(bridge, state);
> + bridge->funcs->atomic_post_disable(bridge, old_state);
> else if (bridge->funcs->post_disable)
> bridge->funcs->post_disable(bridge);
> }
> @@ -515,7 +515,7 @@ EXPORT_SYMBOL(drm_atomic_bridge_chain_post_disable);
> * drm_atomic_bridge_chain_pre_enable - prepares for enabling all bridges in
> * the encoder chain
> * @bridge: bridge control structure
> - * @state: atomic state being committed
> + * @old_state: old atomic state
> *
> * Calls &drm_bridge_funcs.atomic_pre_enable (falls back on
> * &drm_bridge_funcs.pre_enable) op for all the bridges in the encoder chain,
> @@ -525,7 +525,7 @@ EXPORT_SYMBOL(drm_atomic_bridge_chain_post_disable);
> * Note: the bridge passed should be the one closest to the encoder
> */
> void drm_atomic_bridge_chain_pre_enable(struct drm_bridge *bridge,
> - struct drm_atomic_state *state)
> + struct drm_atomic_state *old_state)
> {
> struct drm_encoder *encoder;
> struct drm_bridge *iter;
> @@ -537,7 +537,7 @@ void drm_atomic_bridge_chain_pre_enable(struct drm_bridge *bridge,
> list_for_each_entry_reverse(iter, &bridge->encoder->bridge_chain,
> chain_node) {
> if (iter->funcs->atomic_pre_enable)
> - iter->funcs->atomic_pre_enable(iter, state);
> + iter->funcs->atomic_pre_enable(iter, old_state);
> else if (iter->funcs->pre_enable)
> iter->funcs->pre_enable(iter);
>
> @@ -550,7 +550,7 @@ EXPORT_SYMBOL(drm_atomic_bridge_chain_pre_enable);
> /**
> * drm_atomic_bridge_chain_enable - enables all bridges in the encoder chain
> * @bridge: bridge control structure
> - * @state: atomic state being committed
> + * @old_state: old atomic state
> *
> * Calls &drm_bridge_funcs.atomic_enable (falls back on
> * &drm_bridge_funcs.enable) op for all the bridges in the encoder chain,
> @@ -560,7 +560,7 @@ EXPORT_SYMBOL(drm_atomic_bridge_chain_pre_enable);
> * Note: the bridge passed should be the one closest to the encoder
> */
> void drm_atomic_bridge_chain_enable(struct drm_bridge *bridge,
> - struct drm_atomic_state *state)
> + struct drm_atomic_state *old_state)
> {
> struct drm_encoder *encoder;
>
> @@ -571,7 +571,7 @@ void drm_atomic_bridge_chain_enable(struct drm_bridge *bridge,
> list_for_each_entry_from(bridge, &bridge->encoder->bridge_chain,
> chain_node) {
> if (bridge->funcs->atomic_enable)
> - bridge->funcs->atomic_enable(bridge, state);
> + bridge->funcs->atomic_enable(bridge, old_state);
> else if (bridge->funcs->enable)
> bridge->funcs->enable(bridge);
> }
> diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
> index a608c47d1de5..e814e6d6e7c2 100644
> --- a/include/drm/drm_bridge.h
> +++ b/include/drm/drm_bridge.h
> @@ -266,6 +266,8 @@ struct drm_bridge_funcs {
> * bridge's @atomic_pre_enable or @pre_enable function. If the preceding
> * element is a &drm_encoder it's called right before the encoder's
> * &drm_encoder_helper_funcs.atomic_enable hook.
> + * This hook is passed the old atomic state (atomic state after new/old
> + * states have been swapped).
I think the name change is enough to explain this. If you want to make
it explicit in the documentation, I find the part between parentheses a
bit confusing.
With this comment addressed,
Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> *
> * The display pipe (i.e. clocks and timing signals) feeding this bridge
> * will not yet be running when this callback is called. The bridge must
> @@ -281,7 +283,7 @@ struct drm_bridge_funcs {
> * The @atomic_pre_enable callback is optional.
> */
> void (*atomic_pre_enable)(struct drm_bridge *bridge,
> - struct drm_atomic_state *state);
> + struct drm_atomic_state *old_state);
>
> /**
> * @atomic_enable:
> @@ -292,6 +294,8 @@ struct drm_bridge_funcs {
> * bridge's @atomic_enable or @enable function. If the preceding element
> * is a &drm_encoder it's called right after the encoder's
> * &drm_encoder_helper_funcs.atomic_enable hook.
> + * This hook is passed the old atomic state (atomic state after new/old
> + * states have been swapped).
> *
> * The bridge can assume that the display pipe (i.e. clocks and timing
> * signals) feeding it is running when this callback is called. This
> @@ -306,7 +310,7 @@ struct drm_bridge_funcs {
> * The @atomic_enable callback is optional.
> */
> void (*atomic_enable)(struct drm_bridge *bridge,
> - struct drm_atomic_state *state);
> + struct drm_atomic_state *old_state);
> /**
> * @atomic_disable:
> *
> @@ -316,6 +320,8 @@ struct drm_bridge_funcs {
> * bridge's @atomic_disable or @disable vfunc. If the preceding element
> * is a &drm_encoder it's called right before the
> * &drm_encoder_helper_funcs.atomic_disable hook.
> + * This hook is passed the old atomic state (atomic state after new/old
> + * states have been swapped).
> *
> * The bridge can assume that the display pipe (i.e. clocks and timing
> * signals) feeding it is still running when this callback is called.
> @@ -329,7 +335,7 @@ struct drm_bridge_funcs {
> * The @atomic_disable callback is optional.
> */
> void (*atomic_disable)(struct drm_bridge *bridge,
> - struct drm_atomic_state *state);
> + struct drm_atomic_state *old_state);
>
> /**
> * @atomic_post_disable:
> @@ -340,6 +346,8 @@ struct drm_bridge_funcs {
> * @atomic_post_disable or @post_disable function. If the preceding
> * element is a &drm_encoder it's called right after the encoder's
> * &drm_encoder_helper_funcs.atomic_disable hook.
> + * This hook is passed the old atomic state (atomic state after new/old
> + * states have been swapped).
> *
> * The bridge must assume that the display pipe (i.e. clocks and timing
> * signals) feeding it is no longer running when this callback is
> @@ -355,7 +363,7 @@ struct drm_bridge_funcs {
> * The @atomic_post_disable callback is optional.
> */
> void (*atomic_post_disable)(struct drm_bridge *bridge,
> - struct drm_atomic_state *state);
> + struct drm_atomic_state *old_state);
>
> /**
> * @atomic_duplicate_state:
--
Regards,
Laurent Pinchart
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