iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

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

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

[HOW]
Add the Validate function in C source file

Reviewed-by: Wenjing Liu <Wenjing.Liu@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>
This commit is contained in:
Mustapha Ghaddar 2023-02-27 08:04:39 -05:00 committed by Alex Deucher
parent 5d04d13954
commit d142d4113f
2 changed files with 48 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c
View File

@ -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;
}

14
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.h
View File

@ -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_ */