[PATCH AUTOSEL 5.19 016/105] drm/amd/display: Correct min comp buffer size

[Sasha Levin]

From: Duncan Ma <duncan.ma@xxxxxxx>

[ Upstream commit 0c56705d8aae9696348cc320b71d531ede001b79 ]

[Why]
In 3-way mpo pipes, there is a case that we
overbook the CRB buffer size. At rare instances,
overbooking the crb will cause underflow. This only
happens when det_size changes dynamically
based on pipe_cnt.

[How]
Set min compbuff size to 1 segment when preparing BW.

Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@xxxxxxx>
Acked-by: Hamza Mahfooz <hamza.mahfooz@xxxxxxx>
Signed-off-by: Duncan Ma <duncan.ma@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/gpu/drm/amd/display/dc/dml/dcn31/dcn31_fpu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn31/dcn31_fpu.c b/drivers/gpu/drm/amd/display/dc/dml/dcn31/dcn31_fpu.c
index 54db2eca9e6b..1b02f0ebe957 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn31/dcn31_fpu.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn31/dcn31_fpu.c
@@ -201,7 +201,7 @@ struct _vcs_dpi_ip_params_st dcn3_15_ip = {
 	.hostvm_max_page_table_levels = 2,
 	.rob_buffer_size_kbytes = 64,
 	.det_buffer_size_kbytes = DCN3_15_DEFAULT_DET_SIZE,
-	.min_comp_buffer_size_kbytes = DCN3_15_MIN_COMPBUF_SIZE_KB,
+	.min_comp_buffer_size_kbytes = 64,
 	.config_return_buffer_size_in_kbytes = 1024,
 	.compressed_buffer_segment_size_in_kbytes = 64,
 	.meta_fifo_size_in_kentries = 32,
@@ -297,6 +297,7 @@ struct _vcs_dpi_ip_params_st dcn3_16_ip = {
 	.hostvm_max_page_table_levels = 2,
 	.rob_buffer_size_kbytes = 64,
 	.det_buffer_size_kbytes = DCN3_16_DEFAULT_DET_SIZE,
+	.min_comp_buffer_size_kbytes = 64,
 	.config_return_buffer_size_in_kbytes = 1024,
 	.compressed_buffer_segment_size_in_kbytes = 64,
 	.meta_fifo_size_in_kentries = 32,
-- 
2.35.1