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Message-Id: <20241019200530.270738-5-aradhya.bhatia@linux.dev>
Date: Sun, 20 Oct 2024 01:35:29 +0530
From: Aradhya Bhatia <aradhya.bhatia@...ux.dev>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Andrzej Hajda <andrzej.hajda@...el.com>,
Neil Armstrong <neil.armstrong@...aro.org>,
Robert Foss <rfoss@...nel.org>,
Jonas Karlman <jonas@...boo.se>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>,
Simona Vetter <simona@...ll.ch>
Cc: Dominik Haller <d.haller@...tec.de>,
Sam Ravnborg <sam@...nborg.org>,
Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
Nishanth Menon <nm@...com>,
Vignesh Raghavendra <vigneshr@...com>,
Devarsh Thakkar <devarsht@...com>,
Praneeth Bajjuri <praneeth@...com>,
Udit Kumar <u-kumar1@...com>,
Jayesh Choudhary <j-choudhary@...com>,
DRI Development List <dri-devel@...ts.freedesktop.org>,
Linux Kernel List <linux-kernel@...r.kernel.org>,
Aradhya Bhatia <aradhya.bhatia@...ux.dev>
Subject: [PATCH v5 12/13] drm/atomic-helper: Re-order bridge chain pre-enable and post-disable
From: Aradhya Bhatia <a-bhatia1@...com>
Move the bridge pre_enable call before crtc enable, and the bridge
post_disable call after the crtc disable.
The sequence of enable after this patch will look like:
bridge[n]_pre_enable
...
bridge[1]_pre_enable
crtc_enable
encoder_enable
bridge[1]_enable
...
bridge[n]_enable
and vice-versa for the bridge chain disable sequence.
The definition of bridge pre_enable hook says that,
"The display pipe (i.e. clocks and timing signals) feeding this bridge
will not yet be running when this callback is called".
Since CRTC is also a source feeding the bridge, it should not be enabled
before the bridges in the pipeline are pre_enabled. Fix that by
re-ordering the sequence of bridge pre_enable and bridge post_disable.
Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>
Signed-off-by: Aradhya Bhatia <aradhya.bhatia@...ux.dev>
---
drivers/gpu/drm/drm_atomic_helper.c | 102 ++++++++++++++++++----------
include/drm/drm_atomic_helper.h | 5 ++
2 files changed, 71 insertions(+), 36 deletions(-)
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 7741fbcc8fc7..6ebd869df79b 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -1122,7 +1122,8 @@ crtc_needs_disable(struct drm_crtc_state *old_state,
}
static void
-encoder_bridge_chain_disable(struct drm_device *dev, struct drm_atomic_state *old_state)
+encoder_bridge_chain_disable(struct drm_device *dev, struct drm_atomic_state *old_state,
+ enum bridge_chain_operation_type op_type)
{
struct drm_connector *connector;
struct drm_connector_state *old_conn_state, *new_conn_state;
@@ -1162,31 +1163,43 @@ encoder_bridge_chain_disable(struct drm_device *dev, struct drm_atomic_state *ol
if (WARN_ON(!encoder))
continue;
- funcs = encoder->helper_private;
-
- drm_dbg_atomic(dev, "disabling [ENCODER:%d:%s]\n",
- encoder->base.id, encoder->name);
-
/*
* Each encoder has at most one connector (since we always steal
* it away), so we won't call disable hooks twice.
*/
bridge = drm_bridge_chain_get_first_bridge(encoder);
- drm_atomic_bridge_chain_disable(bridge, old_state);
- /* Right function depends upon target state. */
- if (funcs) {
- if (funcs->atomic_disable)
- funcs->atomic_disable(encoder, old_state);
- else if (new_conn_state->crtc && funcs->prepare)
- funcs->prepare(encoder);
- else if (funcs->disable)
- funcs->disable(encoder);
- else if (funcs->dpms)
- funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
- }
+ switch (op_type) {
+ case DRM_BRIDGE_ENABLE_DISABLE:
+ funcs = encoder->helper_private;
+
+ drm_dbg_atomic(dev, "disabling [ENCODER:%d:%s]\n",
+ encoder->base.id, encoder->name);
+
+ drm_atomic_bridge_chain_disable(bridge, old_state);
+
+ /* Right function depends upon target state. */
+ if (funcs) {
+ if (funcs->atomic_disable)
+ funcs->atomic_disable(encoder, old_state);
+ else if (new_conn_state->crtc && funcs->prepare)
+ funcs->prepare(encoder);
+ else if (funcs->disable)
+ funcs->disable(encoder);
+ else if (funcs->dpms)
+ funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
+ }
- drm_atomic_bridge_chain_post_disable(bridge, old_state);
+ break;
+
+ case DRM_BRIDGE_PRE_ENABLE_POST_DISABLE:
+ drm_atomic_bridge_chain_post_disable(bridge, old_state);
+ break;
+
+ default:
+ drm_err(dev, "Unrecognized Encoder/Bridge Operation (%d).\n", op_type);
+ break;
+ }
}
}
@@ -1197,7 +1210,7 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
struct drm_crtc_state *old_crtc_state, *new_crtc_state;
int i;
- encoder_bridge_chain_disable(dev, old_state);
+ encoder_bridge_chain_disable(dev, old_state, DRM_BRIDGE_ENABLE_DISABLE);
for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
const struct drm_crtc_helper_funcs *funcs;
@@ -1243,6 +1256,8 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
if (ret == 0)
drm_crtc_vblank_put(crtc);
}
+
+ encoder_bridge_chain_disable(dev, old_state, DRM_BRIDGE_PRE_ENABLE_POST_DISABLE);
}
/**
@@ -1455,7 +1470,8 @@ static void drm_atomic_helper_commit_writebacks(struct drm_device *dev,
}
static void
-encoder_bridge_chain_enable(struct drm_device *dev, struct drm_atomic_state *old_state)
+encoder_bridge_chain_enable(struct drm_device *dev, struct drm_atomic_state *old_state,
+ enum bridge_chain_operation_type op_type)
{
struct drm_connector *connector;
struct drm_connector_state *new_conn_state;
@@ -1474,28 +1490,40 @@ encoder_bridge_chain_enable(struct drm_device *dev, struct drm_atomic_state *old
continue;
encoder = new_conn_state->best_encoder;
- funcs = encoder->helper_private;
-
- drm_dbg_atomic(dev, "enabling [ENCODER:%d:%s]\n",
- encoder->base.id, encoder->name);
/*
* Each encoder has at most one connector (since we always steal
* it away), so we won't call enable hooks twice.
*/
bridge = drm_bridge_chain_get_first_bridge(encoder);
- drm_atomic_bridge_chain_pre_enable(bridge, old_state);
- if (funcs) {
- if (funcs->atomic_enable)
- funcs->atomic_enable(encoder, old_state);
- else if (funcs->enable)
- funcs->enable(encoder);
- else if (funcs->commit)
- funcs->commit(encoder);
- }
+ switch (op_type) {
+ case DRM_BRIDGE_PRE_ENABLE_POST_DISABLE:
+ drm_atomic_bridge_chain_pre_enable(bridge, old_state);
+ break;
+
+ case DRM_BRIDGE_ENABLE_DISABLE:
+ funcs = encoder->helper_private;
+
+ drm_dbg_atomic(dev, "enabling [ENCODER:%d:%s]\n",
+ encoder->base.id, encoder->name);
- drm_atomic_bridge_chain_enable(bridge, old_state);
+ if (funcs) {
+ if (funcs->atomic_enable)
+ funcs->atomic_enable(encoder, old_state);
+ else if (funcs->enable)
+ funcs->enable(encoder);
+ else if (funcs->commit)
+ funcs->commit(encoder);
+ }
+
+ drm_atomic_bridge_chain_enable(bridge, old_state);
+ break;
+
+ default:
+ drm_err(dev, "Unrecognized Encoder/Bridge Operation (%d).\n", op_type);
+ break;
+ }
}
}
@@ -1521,6 +1549,8 @@ void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
struct drm_crtc_state *new_crtc_state;
int i;
+ encoder_bridge_chain_enable(dev, old_state, DRM_BRIDGE_PRE_ENABLE_POST_DISABLE);
+
for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
const struct drm_crtc_helper_funcs *funcs;
@@ -1543,7 +1573,7 @@ void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
}
}
- encoder_bridge_chain_enable(dev, old_state);
+ encoder_bridge_chain_enable(dev, old_state, DRM_BRIDGE_ENABLE_DISABLE);
drm_atomic_helper_commit_writebacks(dev, old_state);
}
diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
index 9aa0a05aa072..92a5812adc6c 100644
--- a/include/drm/drm_atomic_helper.h
+++ b/include/drm/drm_atomic_helper.h
@@ -43,6 +43,11 @@
*/
#define DRM_PLANE_NO_SCALING (1<<16)
+enum bridge_chain_operation_type {
+ DRM_BRIDGE_PRE_ENABLE_POST_DISABLE,
+ DRM_BRIDGE_ENABLE_DISABLE,
+};
+
struct drm_atomic_state;
struct drm_private_obj;
struct drm_private_state;
--
2.34.1
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