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drm/amd/display: Add debug option to control BW Allocation mode

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[Why & How]
Add debug option to control BW Allocation mode.

Reviewed-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Reviewed-by: PeiChen (Pei-Chen) Huang <peichen.huang@amd.com>
Signed-off-by: Cruise Hung <Cruise.Hung@amd.com>
Signed-off-by: Ivan Lipski <ivan.lipski@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Cruise Hung 2025-07-15 16:36:44 +08:00 committed by Alex Deucher
parent 7af124772f
commit 9a885f1193
2 changed files with 7 additions and 1 deletions
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3
drivers/gpu/drm/amd/display/dc/dc.h
View File

@ -839,7 +839,8 @@ union dpia_debug_options {
uint32_t enable_force_tbt3_work_around:1; /* bit 4 */
uint32_t disable_usb4_pm_support:1; /* bit 5 */
uint32_t enable_usb4_bw_zero_alloc_patch:1; /* bit 6 */
uint32_t reserved:25;
uint32_t enable_bw_allocation_mode:1; /* bit 7 */
uint32_t reserved:24;
} bits;
uint32_t raw;
};

5
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c
View File

@ -225,6 +225,11 @@ bool link_dpia_enable_usb4_dp_bw_alloc_mode(struct dc_link *link)
bool ret = false;
uint8_t val;
if (link->dc->debug.dpia_debug.bits.enable_bw_allocation_mode == false) {
DC_LOG_DEBUG("%s: link[%d] DPTX BW allocation mode disabled", __func__, link->link_index);
return false;
}
val = DPTX_BW_ALLOC_MODE_ENABLE | DPTX_BW_ALLOC_UNMASK_IRQ;
if (core_link_write_dpcd(link, DPTX_BW_ALLOCATION_MODE_CONTROL, &val, sizeof(uint8_t)) == DC_OK) {