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drm: Stop accessing encoder->bridge directly

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We are about to replace the single-linked bridge list by a double-linked
one based on list.h, leading to the suppression of the encoder->bridge
field. But before we can do that we must provide a
drm_bridge_chain_get_first_bridge() bridge helper and patch all drivers
and core helpers to use it instead of directly accessing encoder->bridge.

Note that we still have 2 drivers (VC4 and Exynos) manipulating the
encoder->bridge field directly because they need to cut the bridge chain
in order to control the enable/disable sequence. This is definitely
not something we want to encourage, so let's keep those 2 oddities
around until we find a better solution.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191203141515.3597631-4-boris.brezillon@collabora.com
This commit is contained in:
Boris Brezillon
2019-12-03 15:15:07 +01:00
parent fadf872d9d
commit 35a61fe921
6 changed files with 52 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
drivers/gpu/drm/drm_atomic_helper.c
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@@ -419,6 +419,7 @@ mode_fixup(struct drm_atomic_state *state)
for_each_new_connector_in_state(state, connector, new_conn_state, i) {
const struct drm_encoder_helper_funcs *funcs;
struct drm_encoder *encoder;
struct drm_bridge *bridge;
WARN_ON(!!new_conn_state->best_encoder != !!new_conn_state->crtc);
@@ -435,7 +436,8 @@ mode_fixup(struct drm_atomic_state *state)
encoder = new_conn_state->best_encoder;
funcs = encoder->helper_private;
ret = drm_bridge_chain_mode_fixup(encoder->bridge,
bridge = drm_bridge_chain_get_first_bridge(encoder);
ret = drm_bridge_chain_mode_fixup(bridge,
&new_crtc_state->mode,
&new_crtc_state->adjusted_mode);
if (!ret) {
@@ -493,6 +495,7 @@ static enum drm_mode_status mode_valid_path(struct drm_connector *connector,
struct drm_crtc *crtc,
const struct drm_display_mode *mode)
{
struct drm_bridge *bridge;
enum drm_mode_status ret;
ret = drm_encoder_mode_valid(encoder, mode);
@@ -502,7 +505,8 @@ static enum drm_mode_status mode_valid_path(struct drm_connector *connector,
return ret;
}
ret = drm_bridge_chain_mode_valid(encoder->bridge, mode);
bridge = drm_bridge_chain_get_first_bridge(encoder);
ret = drm_bridge_chain_mode_valid(bridge, mode);
if (ret != MODE_OK) {
DRM_DEBUG_ATOMIC("[BRIDGE] mode_valid() failed\n");
return ret;
@@ -985,6 +989,7 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
for_each_oldnew_connector_in_state(old_state, connector, old_conn_state, new_conn_state, i) {
const struct drm_encoder_helper_funcs *funcs;
struct drm_encoder *encoder;
struct drm_bridge *bridge;
/* Shut down everything that's in the changeset and currently
* still on. So need to check the old, saved state. */
@@ -1021,7 +1026,8 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
* Each encoder has at most one connector (since we always steal
* it away), so we won't call disable hooks twice.
*/
drm_atomic_bridge_chain_disable(encoder->bridge, old_state);
bridge = drm_bridge_chain_get_first_bridge(encoder);
drm_atomic_bridge_chain_disable(bridge, old_state);
/* Right function depends upon target state. */
if (funcs) {
@@ -1035,8 +1041,7 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
}
drm_atomic_bridge_chain_post_disable(encoder->bridge,
old_state);
drm_atomic_bridge_chain_post_disable(bridge, old_state);
}
for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
@@ -1190,6 +1195,7 @@ crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
const struct drm_encoder_helper_funcs *funcs;
struct drm_encoder *encoder;
struct drm_display_mode *mode, *adjusted_mode;
struct drm_bridge *bridge;
if (!new_conn_state->best_encoder)
continue;
@@ -1217,8 +1223,8 @@ crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
funcs->mode_set(encoder, mode, adjusted_mode);
}
drm_bridge_chain_mode_set(encoder->bridge, mode,
adjusted_mode);
bridge = drm_bridge_chain_get_first_bridge(encoder);
drm_bridge_chain_mode_set(bridge, mode, adjusted_mode);
}
}
@@ -1317,6 +1323,7 @@ void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
for_each_new_connector_in_state(old_state, connector, new_conn_state, i) {
const struct drm_encoder_helper_funcs *funcs;
struct drm_encoder *encoder;
struct drm_bridge *bridge;
if (!new_conn_state->best_encoder)
continue;
@@ -1335,7 +1342,8 @@ void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
* Each encoder has at most one connector (since we always steal
* it away), so we won't call enable hooks twice.
*/
drm_atomic_bridge_chain_pre_enable(encoder->bridge, old_state);
bridge = drm_bridge_chain_get_first_bridge(encoder);
drm_atomic_bridge_chain_pre_enable(bridge, old_state);
if (funcs) {
if (funcs->atomic_enable)
@@ -1346,7 +1354,7 @@ void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
funcs->commit(encoder);
}
drm_atomic_bridge_chain_enable(encoder->bridge, old_state);
drm_atomic_bridge_chain_enable(bridge, old_state);
}
drm_atomic_helper_commit_writebacks(dev, old_state);