drm/amd/display: Request PHYCLK adjustment on PHY enable/disable

[Why]
Currently we don't explicitly send a request for a minimum PHYCLK, and
we hope that the dependencies other clocks have will raise PHYCLK when
needed.

[How]
- new clk_mgr function to keep track of PHYCLK requirements
- request maximum requirement across all links
- remove PHYCLK from clock state comparator, as it doesn't come from DML

Signed-off-by: Joshua Aberback <joshua.aberback@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Eryk Brol <eryk.brol@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
index d0a23b72e604..dd88eb348dfa 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
@@ -14,6 +14,7 @@
 #include "dpcd_defs.h"
 #include "dsc.h"
 #include "resource.h"
+#include "clk_mgr.h"
 
 static uint8_t convert_to_count(uint8_t lttpr_repeater_count)
 {
@@ -123,6 +124,11 @@ void dp_enable_link_phy(
 		}
 	}
 
+	link->cur_link_settings = *link_settings;
+
+	if (dc->clk_mgr->funcs->notify_link_rate_change)
+		dc->clk_mgr->funcs->notify_link_rate_change(dc->clk_mgr, link);
+
 	if (dmcu != NULL && dmcu->funcs->lock_phy)
 		dmcu->funcs->lock_phy(dmcu);
 
@@ -141,8 +147,6 @@ void dp_enable_link_phy(
 	if (dmcu != NULL && dmcu->funcs->unlock_phy)
 		dmcu->funcs->unlock_phy(dmcu);
 
-	link->cur_link_settings = *link_settings;
-
 	dp_receiver_power_ctrl(link, true);
 }
 
@@ -234,6 +238,9 @@ void dp_disable_link_phy(struct dc_link *link, enum signal_type signal)
 	/* Clear current link setting.*/
 	memset(&link->cur_link_settings, 0,
 			sizeof(link->cur_link_settings));
+
+	if (dc->clk_mgr->funcs->notify_link_rate_change)
+		dc->clk_mgr->funcs->notify_link_rate_change(dc->clk_mgr, link);
 }
 
 void dp_disable_link_phy_mst(struct dc_link *link, enum signal_type signal)