Commit d142d411 authored by Mustapha Ghaddar's avatar Mustapha Ghaddar Committed by Alex Deucher
Browse files

drm/amd/display: Add Validate BW for USB4 Links 



[WHY]
To validate the BW used for DPIAs per HostRouter

[HOW]
Add the Validate function in C source file

Reviewed-by: default avatarWenjing Liu <Wenjing.Liu@amd.com>
Acked-by: default avatarQingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: default avatarMustapha Ghaddar <mghaddar@amd.com>
Tested-by: default avatarDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 5d04d139

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

+34 −0
Original line number Diff line number Diff line
@@ -33,6 +33,10 @@ 
#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)



// ------------------------------------------------------------------
@@ -458,3 +462,33 @@ 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 ret = true;

	int bw_needed_per_hr[MAX_HR_NUM] = { 0, 0 };

	uint8_t lowest_dpia_index = 0, dpia_index = 0;



	if (!num_dpias || num_dpias > MAX_DPIA_NUM)

		return ret;



	//Get total Host Router BW & Validate against each Host Router max BW

	for (uint8_t i = 0; i < num_dpias; ++i) {



		if (!link[i]->dpia_bw_alloc_config.bw_alloc_enabled)

			continue;



		lowest_dpia_index = get_lowest_dpia_index(link[i]);

		if (link[i]->link_index < lowest_dpia_index)

			continue;



		dpia_index = (link[i]->link_index - lowest_dpia_index) / 2;

		bw_needed_per_hr[dpia_index] += bw_needed_per_dpia[i];

		if (bw_needed_per_hr[dpia_index] > get_host_router_total_bw(link[i], HOST_ROUTER_BW_ALLOCATED)) {



			ret = false;

			break;

		}

	}



	return ret;

}

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

+14 −0
Original line number Diff line number Diff line
@@ -25,7 +25,9 @@ 


#ifndef DC_INC_LINK_DP_DPIA_BW_H_

#define DC_INC_LINK_DP_DPIA_BW_H_



#include "link.h"



/*

 * Host Router BW type

 */
@@ -80,4 +82,16 @@ int dpia_handle_usb4_bandwidth_allocation_for_link(struct dc_link *link, int pea 
 */

void dpia_handle_bw_alloc_response(struct dc_link *link, uint8_t bw, uint8_t result);



/*

 * Handle the validation of total BW here and confirm that the bw used by each

 * DPIA doesn't exceed available BW for each host router (HR)

 *

 * @link[]: array of link pointer to all possible DPIA links

 * @bw_needed[]: bw needed for each DPIA link based on timing

 * @num_dpias: Number of DPIAs for the above 2 arrays. Should always be <= MAX_DPIA_NUM

 *

 * 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);



#endif /* DC_INC_LINK_DP_DPIA_BW_H_ */