[PATCH 17/25] drm/amd/display: Add debug option to control BW Allocation mode

[IVAN.LIPSKI at amd.com]

From: Cruise Hung <Cruise.Hung at amd.com>

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

Reviewed-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram at amd.com>
Reviewed-by: PeiChen (Pei-Chen) Huang <peichen.huang at amd.com>
Signed-off-by: Cruise Hung <Cruise.Hung at amd.com>
Signed-off-by: Ivan Lipski <ivan.lipski at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dc.h                          | 3 ++-
 .../gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c  | 5 +++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index fee54cc0f7d4..57f4a9445b7e 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -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;
 };
diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c
index 906d85ca8956..8a3c18ae97a7 100644
--- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c
@@ -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) {
-- 
2.43.0