drm/amd/display: Add HDCP policy control

[Why]
DM should be able to control HDCP retry limit via configurable
parameter.

[How]
Expose a retry_limit parameter for controlling the maximum number of
retries and lift the hardcode out to DM.

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Aric Cyr <aric.cyr@amd.com>
Signed-off-by: Oleh Kuzhylnyi <okuzhyln@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: Oleh Kuzhylnyi

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c

@@ -223,6 +223,7 @@ void hdcp_update_display(struct hdcp_workqueue *hdcp_work,
 		display_adjust.disable = MOD_HDCP_DISPLAY_NOT_DISABLE;
 
 		link_adjust.auth_delay = 2;
+		link_adjust.retry_limit = MAX_NUM_OF_ATTEMPTS;
 
 		if (content_type == DRM_MODE_HDCP_CONTENT_TYPE0) {
 			link_adjust.hdcp2.force_type = MOD_HDCP_FORCE_TYPE_0;
@@ -572,6 +573,7 @@ static void update_config(void *handle, struct cp_psp_stream_config *config)
 	link->dp.usb4_enabled = config->usb4_enabled;
 	display->adjust.disable = MOD_HDCP_DISPLAY_DISABLE_AUTHENTICATION;
 	link->adjust.auth_delay = 2;
+	link->adjust.retry_limit = MAX_NUM_OF_ATTEMPTS;
 	link->adjust.hdcp1.disable = 0;
 	hdcp_w->encryption_status[display->index] = MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF;
 

drivers/gpu/drm/amd/display/modules/hdcp/hdcp.c

@@ -29,6 +29,7 @@ static void push_error_status(struct mod_hdcp *hdcp,
 		enum mod_hdcp_status status)
 {
 	struct mod_hdcp_trace *trace = &hdcp->connection.trace;
+	const uint8_t retry_limit = hdcp->connection.link.adjust.retry_limit;
 
 	if (trace->error_count < MAX_NUM_OF_ERROR_TRACE) {
 		trace->errors[trace->error_count].status = status;
@@ -39,11 +40,11 @@ static void push_error_status(struct mod_hdcp *hdcp,
 
 	if (is_hdcp1(hdcp)) {
 		hdcp->connection.hdcp1_retry_count++;
-		if (hdcp->connection.hdcp1_retry_count == MAX_NUM_OF_ATTEMPTS)
+		if (hdcp->connection.hdcp1_retry_count == retry_limit)
 			hdcp->connection.link.adjust.hdcp1.disable = 1;
 	} else if (is_hdcp2(hdcp)) {
 		hdcp->connection.hdcp2_retry_count++;
-		if (hdcp->connection.hdcp2_retry_count == MAX_NUM_OF_ATTEMPTS)
+		if (hdcp->connection.hdcp2_retry_count == retry_limit)
 			hdcp->connection.link.adjust.hdcp2.disable = 1;
 	}
 }

drivers/gpu/drm/amd/display/modules/inc/mod_hdcp.h

@@ -220,6 +220,7 @@ struct mod_hdcp_link_adjustment_hdcp2 {
 
 struct mod_hdcp_link_adjustment {
 	uint8_t auth_delay;
+	uint8_t retry_limit;
 	struct mod_hdcp_link_adjustment_hdcp1 hdcp1;
 	struct mod_hdcp_link_adjustment_hdcp2 hdcp2;
 };