drm/amd/display: Add function pointer for validate bw usb4

[WHY]
In order to follow the new protocol of calling link functions

[HOW]
Add the function pointer to the link_srv
Reviewed-by: Kshitij Bhardwaj <kshitij.bhardwaj1@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Mustapha Ghaddar <mghaddar@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc_link_exports.c

@@ -473,3 +473,8 @@ void dc_link_enable_hpd_filter(struct dc_link *link, bool enable)
 {
 	link->dc->link_srv->enable_hpd_filter(link, enable);
 }
+
+bool dc_link_validate(struct dc *dc, const struct dc_stream_state *streams, const unsigned int count)
+{
+	return dc->link_srv->validate_dpia_bandwidth(streams, count);
+}

drivers/gpu/drm/amd/display/dc/dc.h

@@ -2028,6 +2028,19 @@ void dc_link_handle_usb4_bw_alloc_response(struct dc_link *link,
 int dc_link_dp_dpia_handle_usb4_bandwidth_allocation_for_link(
 		struct dc_link *link, int peak_bw);
 
+/*
+ * Validate the BW of all the valid DPIA links to make sure it doesn't exceed
+ * available BW for each host router
+ *
+ * @dc: pointer to dc struct
+ * @stream: pointer to all possible streams
+ * @num_streams: number of valid DPIA streams
+ *
+ * return: TRUE if bw used by DPIAs doesn't exceed available BW else return FALSE
+ */
+bool dc_link_validate(struct dc *dc, const struct dc_stream_state *streams,
+		const unsigned int count);
+
 /* Sink Interfaces - A sink corresponds to a display output device */
 
 struct dc_container_id {

drivers/gpu/drm/amd/display/dc/inc/link.h

@@ -144,6 +144,9 @@ struct link_service {
 	uint32_t (*dp_link_bandwidth_kbps)(
 		const struct dc_link *link,
 		const struct dc_link_settings *link_settings);
+	bool (*validate_dpia_bandwidth)(
+			const struct dc_stream_state *stream,
+			const unsigned int num_streams);
 
 
 	/*************************** DPMS *************************************/

drivers/gpu/drm/amd/display/dc/link/link_factory.c

@@ -99,6 +99,7 @@ static void construct_link_service_validation(struct link_service *link_srv)
 {
 	link_srv->validate_mode_timing = link_validate_mode_timing;
 	link_srv->dp_link_bandwidth_kbps = dp_link_bandwidth_kbps;
+	link_srv->validate_dpia_bandwidth = link_validate_dpia_bandwidth;
 }
 
 /* link dpms owns the programming sequence of stream's dpms state associated

drivers/gpu/drm/amd/display/dc/link/link_validation.c

@@ -30,6 +30,7 @@
  */
 #include "link_validation.h"
 #include "protocols/link_dp_capability.h"
+#include "protocols/link_dp_dpia_bw.h"
 #include "resource.h"
 
 #define DC_LOGGER_INIT(logger)
@@ -343,3 +344,20 @@ enum dc_status link_validate_mode_timing(
 
 	return DC_OK;
 }
+
+bool link_validate_dpia_bandwidth(const struct dc_stream_state *stream, const unsigned int num_streams)
+{
+	bool ret = true;
+	int bw_needed[MAX_DPIA_NUM];
+	struct dc_link *link[MAX_DPIA_NUM];
+
+	if (!num_streams || num_streams > MAX_DPIA_NUM)
+		return ret;
+
+	for (uint8_t i = 0; i < num_streams; ++i) {
+
+		link[i] = stream[i].link;
+		bw_needed[i] = dc_bandwidth_in_kbps_from_timing(&stream[i].timing);
+	}
+	return ret;
+}

drivers/gpu/drm/amd/display/dc/link/link_validation.h

@@ -29,7 +29,11 @@ enum dc_status link_validate_mode_timing(
 		const struct dc_stream_state *stream,
 		struct dc_link *link,
 		const struct dc_crtc_timing *timing);
+bool link_validate_dpia_bandwidth(
+		const struct dc_stream_state *stream,
+		const unsigned int num_streams);
 uint32_t dp_link_bandwidth_kbps(
 	const struct dc_link *link,
 	const struct dc_link_settings *link_settings);
+
 #endif /* __LINK_VALIDATION_H__ */

drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c

@@ -33,10 +33,6 @@
 #define DC_LOGGER \
 	link->ctx->logger
 
-/* Number of Host Routers per motherboard is 2 */
-#define MAX_HR_NUM			2
-/* Number of DPIA per host router is 2 */
-#define MAX_DPIA_NUM		(MAX_HR_NUM * 2)
 #define Kbps_TO_Gbps (1000 * 1000)
 
 // ------------------------------------------------------------------
@@ -379,9 +375,8 @@ void dpia_handle_bw_alloc_response(struct dc_link *link, uint8_t bw, uint8_t res
 		// 1. If due to unplug of other sink
 		if (estimated == host_router_total_estimated_bw) {
 			// First update the estimated & max_bw fields
-			if (link->dpia_bw_alloc_config.estimated_bw < estimated) {
+			if (link->dpia_bw_alloc_config.estimated_bw < estimated)
 				link->dpia_bw_alloc_config.estimated_bw = estimated;
-			}
 		}
 		// 2. If due to realloc bw btw 2 dpia due to plug OR realloc unused Bw
 		else {
@@ -464,7 +459,7 @@ int link_dp_dpia_allocate_usb4_bandwidth_for_stream(struct dc_link *link, int re
 out:
 	return ret;
 }
-bool dpia_validate_usb4_bw(struct dc_link **link, int *bw_needed_per_dpia, uint8_t num_dpias)
+bool dpia_validate_usb4_bw(struct dc_link **link, int *bw_needed_per_dpia, const unsigned int num_dpias)
 {
 	bool ret = true;
 	int bw_needed_per_hr[MAX_HR_NUM] = { 0, 0 };

drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.h

@@ -28,6 +28,11 @@
 
 #include "link.h"
 
+/* Number of Host Routers per motherboard is 2 */
+#define MAX_HR_NUM			2
+/* Number of DPIA per host router is 2 */
+#define MAX_DPIA_NUM		(MAX_HR_NUM * 2)
+
 /*
  * Host Router BW type
  */
@@ -92,6 +97,6 @@ void dpia_handle_bw_alloc_response(struct dc_link *link, uint8_t bw, uint8_t res
  *
  * return: TRUE if bw used by DPIAs doesn't exceed available BW else return FALSE
  */
-bool dpia_validate_usb4_bw(struct dc_link **link, int *bw_needed, uint8_t num_dpias);
+bool dpia_validate_usb4_bw(struct dc_link **link, int *bw_needed, const unsigned int num_dpias);
 
 #endif /* DC_INC_LINK_DP_DPIA_BW_H_ */