drm/amd/display: Correct min comp buffer size

[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@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Duncan Ma <duncan.ma@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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 54db2eca9e6b76e7343b79fb97078f27960d10e5..1b02f0ebe957dcc7e68634207c5b376ded696db1 100644 (file)
--- 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,