[PATCH v3 2/2] drm/display/dsc: MST DSC Interface Change
Fangzhi Zuo
Jerry.Zuo at amd.com
Wed Nov 6 15:03:13 UTC 2024
[why]
Starting from dp2 where dsc passthrough is introduced, it is required to identify
the dsc passthrough aux, apart from dsc decompression aux. Existing drm_dp_mst_port function
that returns dsc_aux alone is not sufficient.
[how]
1. Interface change in drm_dp_mst_dsc_aux_for_port, and dependency changes for each vendor.
2. Rename passthrough_aux with dsc_passthrough_aux to align with the name of dsc_aux.
Signed-off-by: Fangzhi Zuo <Jerry.Zuo at amd.com>
Signed-off-by: Wayne Lin <wayne.lin at amd.com>
---
.../amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 2 +-
.../amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 20 +++++------
.../display/amdgpu_dm/amdgpu_dm_mst_types.c | 28 +++++++--------
drivers/gpu/drm/display/drm_dp_mst_topology.c | 34 +++++++++----------
drivers/gpu/drm/i915/display/intel_dp.c | 2 +-
drivers/gpu/drm/i915/display/intel_dp_mst.c | 3 +-
include/drm/display/drm_dp_mst_helper.h | 6 ++--
7 files changed, 47 insertions(+), 48 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
index 6a97bb2d9160..6388cae166b1 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
@@ -1370,7 +1370,7 @@ static int dp_dsc_fec_support_show(struct seq_file *m, void *data)
* enable DSC on the sink device or on MST branch
* its connected to.
*/
- if (aconnector->dsc_aux) {
+ if (aconnector->mst_output_port->dsc_aux) {
is_fec_supported = true;
is_dsc_supported = true;
}
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
index b0fea0856866..94ff77c8fd15 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -820,20 +820,20 @@ bool dm_helpers_dp_write_dsc_enable(
uint8_t ret = 0;
if (stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST) {
- if (!aconnector->dsc_aux)
+ if (!aconnector->mst_output_port->dsc_aux)
return false;
// apply w/a to synaptics
if (needs_dsc_aux_workaround(aconnector->dc_link) &&
(aconnector->mst_downstream_port_present.byte & 0x7) != 0x3)
return write_dsc_enable_synaptics_non_virtual_dpcd_mst(
- aconnector->dsc_aux, stream, enable_dsc);
+ aconnector->mst_output_port->dsc_aux, stream, enable_dsc);
port = aconnector->mst_output_port;
if (enable) {
- if (port->passthrough_aux) {
- ret = drm_dp_dpcd_write(port->passthrough_aux,
+ if (port->dsc_passthrough_aux) {
+ ret = drm_dp_dpcd_write(port->dsc_passthrough_aux,
DP_DSC_ENABLE,
&enable_passthrough, 1);
drm_dbg_dp(dev,
@@ -841,24 +841,24 @@ bool dm_helpers_dp_write_dsc_enable(
ret);
}
- ret = drm_dp_dpcd_write(aconnector->dsc_aux,
+ ret = drm_dp_dpcd_write(aconnector->mst_output_port->dsc_aux,
DP_DSC_ENABLE, &enable_dsc, 1);
drm_dbg_dp(dev,
"MST_DSC Sent DSC decoding enable to %s port, ret = %u\n",
- (port->passthrough_aux) ? "remote RX" :
+ (port->dsc_passthrough_aux) ? "remote RX" :
"virtual dpcd",
ret);
} else {
- ret = drm_dp_dpcd_write(aconnector->dsc_aux,
+ ret = drm_dp_dpcd_write(aconnector->mst_output_port->dsc_aux,
DP_DSC_ENABLE, &enable_dsc, 1);
drm_dbg_dp(dev,
"MST_DSC Sent DSC decoding disable to %s port, ret = %u\n",
- (port->passthrough_aux) ? "remote RX" :
+ (port->dsc_passthrough_aux) ? "remote RX" :
"virtual dpcd",
ret);
- if (port->passthrough_aux) {
- ret = drm_dp_dpcd_write(port->passthrough_aux,
+ if (port->dsc_passthrough_aux) {
+ ret = drm_dp_dpcd_write(port->dsc_passthrough_aux,
DP_DSC_ENABLE,
&enable_passthrough, 1);
drm_dbg_dp(dev,
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index 6e4359490613..a73b14fac07f 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -183,8 +183,8 @@ amdgpu_dm_mst_connector_early_unregister(struct drm_connector *connector)
dc_sink_release(dc_sink);
aconnector->dc_sink = NULL;
aconnector->drm_edid = NULL;
- aconnector->dsc_aux = NULL;
- port->passthrough_aux = NULL;
+ aconnector->mst_output_port->dsc_aux = NULL;
+ aconnector->mst_output_port->dsc_passthrough_aux = NULL;
}
aconnector->mst_status = MST_STATUS_DEFAULT;
@@ -237,7 +237,7 @@ static bool validate_dsc_caps_on_connector(struct amdgpu_dm_connector *aconnecto
u8 dsc_branch_dec_caps_raw[3] = { 0 }; // DSC branch decoder caps 0xA0 ~ 0xA2
u8 *dsc_branch_dec_caps = NULL;
- aconnector->dsc_aux = drm_dp_mst_dsc_aux_for_port(port);
+ drm_dp_mst_dsc_aux_for_port(port);
/*
* drm_dp_mst_dsc_aux_for_port() will return NULL for certain configs
@@ -250,19 +250,19 @@ static bool validate_dsc_caps_on_connector(struct amdgpu_dm_connector *aconnecto
*/
if (!aconnector->dsc_aux && !port->parent->port_parent &&
needs_dsc_aux_workaround(aconnector->dc_link))
- aconnector->dsc_aux = &aconnector->mst_root->dm_dp_aux.aux;
+ aconnector->mst_output_port->dsc_aux = &aconnector->mst_root->dm_dp_aux.aux;
/* synaptics cascaded MST hub case */
if (is_synaptics_cascaded_panamera(aconnector->dc_link, port))
- aconnector->dsc_aux = port->mgr->aux;
+ aconnector->mst_output_port->dsc_aux = port->mgr->aux;
- if (!aconnector->dsc_aux)
+ if (!aconnector->mst_output_port->dsc_aux)
return false;
- if (drm_dp_dpcd_read(aconnector->dsc_aux, DP_DSC_SUPPORT, dsc_caps, 16) < 0)
+ if (drm_dp_dpcd_read(aconnector->mst_output_port->dsc_aux, DP_DSC_SUPPORT, dsc_caps, 16) < 0)
return false;
- if (drm_dp_dpcd_read(aconnector->dsc_aux,
+ if (drm_dp_dpcd_read(aconnector->mst_output_port->dsc_aux,
DP_DSC_BRANCH_OVERALL_THROUGHPUT_0, dsc_branch_dec_caps_raw, 3) == 3)
dsc_branch_dec_caps = dsc_branch_dec_caps_raw;
@@ -279,10 +279,10 @@ static bool retrieve_downstream_port_device(struct amdgpu_dm_connector *aconnect
{
union dp_downstream_port_present ds_port_present;
- if (!aconnector->dsc_aux)
+ if (!aconnector->mst_output_port->dsc_aux)
return false;
- if (drm_dp_dpcd_read(aconnector->dsc_aux, DP_DOWNSTREAMPORT_PRESENT, &ds_port_present, 1) < 0) {
+ if (drm_dp_dpcd_read(aconnector->mst_output_port->dsc_aux, DP_DOWNSTREAMPORT_PRESENT, &ds_port_present, 1) < 0) {
DRM_INFO("Failed to read downstream_port_present 0x05 from DFP of branch device\n");
return false;
}
@@ -505,8 +505,8 @@ dm_dp_mst_detect(struct drm_connector *connector,
dc_sink_release(aconnector->dc_sink);
aconnector->dc_sink = NULL;
aconnector->drm_edid = NULL;
- aconnector->dsc_aux = NULL;
- port->passthrough_aux = NULL;
+ aconnector->mst_output_port->dsc_aux = NULL;
+ aconnector->mst_output_port->dsc_passthrough_aux = NULL;
amdgpu_dm_set_mst_status(&aconnector->mst_status,
MST_REMOTE_EDID | MST_ALLOCATE_NEW_PAYLOAD | MST_CLEAR_ALLOCATED_PAYLOAD,
@@ -1802,13 +1802,13 @@ enum dc_status dm_dp_mst_is_port_support_mode(
}
/*DSC necessary case*/
- if (!aconnector->dsc_aux)
+ if (!aconnector->mst_output_port->dsc_aux)
return DC_FAIL_BANDWIDTH_VALIDATE;
if (is_dsc_common_config_possible(stream, &bw_range)) {
/*capable of dsc passthough. dsc bitstream along the entire path*/
- if (aconnector->mst_output_port->passthrough_aux) {
+ if (aconnector->mst_output_port->dsc_passthrough_aux) {
if (bw_range.min_kbps > end_to_end_bw_in_kbps) {
DRM_DEBUG_DRIVER("MST_DSC dsc passthrough and decode at endpoint"
"Max dsc compression bw can't fit into end-to-end bw\n");
diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c
index a4551c17a07f..483b623961e7 100644
--- a/drivers/gpu/drm/display/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c
@@ -2259,7 +2259,7 @@ void drm_dp_mst_connector_early_unregister(struct drm_connector *connector,
port->aux.name, connector->kdev->kobj.name);
drm_dp_aux_unregister_devnode(&port->aux);
port->dsc_aux = NULL;
- port->passthrough_aux = NULL;
+ port->dsc_passthrough_aux = NULL;
}
EXPORT_SYMBOL(drm_dp_mst_connector_early_unregister);
@@ -5447,7 +5447,8 @@ int drm_dp_mst_add_affected_dsc_crtcs(struct drm_atomic_state *state, struct drm
if (!crtc)
continue;
- if (!drm_dp_mst_dsc_aux_for_port(pos->port))
+ drm_dp_mst_dsc_aux_for_port(pos->port);
+ if (!pos->port->dsc_aux)
continue;
crtc_state = drm_atomic_get_crtc_state(mst_state->base.state, crtc);
@@ -6019,16 +6020,13 @@ EXPORT_SYMBOL(drm_dp_mst_aux_for_parent);
* Depending on the situation, DSC may be enabled via the endpoint aux,
* the immediately upstream aux, or the connector's physical aux.
*
- * This is both the correct aux to read DSC_CAPABILITY and the
- * correct aux to write DSC_ENABLED.
- *
- * This operation can be expensive (up to four aux reads), so
- * the caller should cache the return.
- *
* Returns:
- * NULL if DSC cannot be enabled on this port, otherwise the aux device
+ * port->dsc_aux - point for dsc decompression
+ * null if dsc decompression point not found
+ * port->dsc_passthrough_aux - point for dsc passthrough
+ * null no dsc passthrough support found
*/
-struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port)
+void drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port)
{
struct drm_dp_mst_topology_mgr *mgr = port->mgr;
struct drm_dp_mst_port *immediate_upstream_port = NULL;
@@ -6041,17 +6039,17 @@ struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port)
u8 fec_cap;
if (!port)
- return NULL;
+ return;
port->dsc_aux = NULL;
- port->passthrough_aux = NULL;
+ port->dsc_passthrough_aux = NULL;
/* Policy start */
if (!drm_dp_mst_is_end_device(port->pdt, port->mcs)) {
drm_err(mgr->dev,
"MST_DSC Can't determine dsc aux for port %p which is not connected to end device\n",
port);
- return NULL;
+ return;
}
if (port->parent->port_parent)
@@ -6079,12 +6077,12 @@ struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port)
goto out_dsc_fail;
}
- /* Consider passthrough as the first option for dsc_aux/passthrough_aux */
+ /* Consider passthrough as the first option for dsc_aux/dsc_passthrough_aux */
if (endpoint_dsc & DP_DSC_DECOMPRESSION_IS_SUPPORTED &&
upstream_dsc & DP_DSC_PASSTHROUGH_IS_SUPPORTED) {
dsc_port = port;
port->dsc_aux = &port->aux;
- port->passthrough_aux = upstream_aux;
+ port->dsc_passthrough_aux = upstream_aux;
drm_info(mgr->dev, "MST_DSC dsc passthrough to endpoint\n");
}
@@ -6147,11 +6145,11 @@ struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port)
goto out_dsc_fail;
}
- return port->dsc_aux;
+ return;
out_dsc_fail:
port->dsc_aux = NULL;
- port->passthrough_aux = NULL;
- return NULL;
+ port->dsc_passthrough_aux = NULL;
+ return;
}
EXPORT_SYMBOL(drm_dp_mst_dsc_aux_for_port);
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index fbb096be02ad..139586a75c70 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -3262,7 +3262,7 @@ intel_dp_sink_set_dsc_passthrough(const struct intel_connector *connector,
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct drm_dp_aux *aux = connector->port ?
- connector->port->passthrough_aux : NULL;
+ connector->port->dsc_passthrough_aux : NULL;
if (!aux)
return;
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 7be8fb047b6c..e4e137b1df9f 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -1721,7 +1721,8 @@ static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topolo
intel_dp_init_modeset_retry_work(intel_connector);
- intel_connector->dp.dsc_decompression_aux = drm_dp_mst_dsc_aux_for_port(port);
+ drm_dp_mst_dsc_aux_for_port(port);
+ intel_connector->dp.dsc_decompression_aux = port->dsc_aux;
intel_dp_mst_read_decompression_port_dsc_caps(intel_dp, intel_connector);
intel_connector->dp.dsc_hblank_expansion_quirk =
detect_dsc_hblank_expansion_quirk(intel_connector);
diff --git a/include/drm/display/drm_dp_mst_helper.h b/include/drm/display/drm_dp_mst_helper.h
index 672e8f6b5655..630ecf872e68 100644
--- a/include/drm/display/drm_dp_mst_helper.h
+++ b/include/drm/display/drm_dp_mst_helper.h
@@ -82,7 +82,7 @@ struct drm_dp_mst_branch;
* by &drm_dp_mst_topology_mgr.base.lock.
* @dsc_aux: aux to which DSC decompression request should be sent,
* only set if DSC decompression is possible.
- * @passthrough_aux: parent aux to which DSC pass-through requests should be
+ * @dsc_passthrough_aux: parent aux to which DSC pass-through requests should be
* sent, only set if DSC pass-through is possible.
* @parent: branch device parent of this port
* @connector: DRM connector this port is connected to. Protected by
@@ -138,7 +138,7 @@ struct drm_dp_mst_port {
struct drm_dp_mst_branch *mstb;
struct drm_dp_aux aux; /* i2c bus for this port? */
struct drm_dp_aux *dsc_aux;
- struct drm_dp_aux *passthrough_aux;
+ struct drm_dp_aux *dsc_passthrough_aux;
struct drm_dp_mst_branch *parent;
struct drm_connector *connector;
@@ -959,7 +959,7 @@ bool drm_dp_mst_port_is_logical(struct drm_dp_mst_port *port)
}
struct drm_dp_aux *drm_dp_mst_aux_for_parent(struct drm_dp_mst_port *port);
-struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port);
+void drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port);
static inline struct drm_dp_mst_topology_state *
to_drm_dp_mst_topology_state(struct drm_private_state *state)
--
2.43.0
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