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drm/amd/display: Set compbuf size to min at prep prevent overbook crb

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[Why]
Detbuffer size is dynamically set for dcn31x. At certain moment,
compbuf+(def size * num pipes) > config return buffer size causing
flickering. This is easily reproducible when MPO is
enabled with two displays.

[How]
At prepare BW, use the min comp buffer size. When it is to
optimize BW, set compbuf size back to maximum possible size.

Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Solomon Chiu <solomon.chiu@amd.com>
Signed-off-by: Duncan Ma <duncanma@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Duncan Ma
2022-02-08 15:05:09 -05:00
committed by Alex Deucher
parent e0adbe73d7
commit 2e6e14c9e4
2 changed files with 11 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
View File

@@ -1818,6 +1818,7 @@ void dcn20_prepare_bandwidth(
struct dc_state *context)
{
struct hubbub *hubbub = dc->res_pool->hubbub;
unsigned int compbuf_size_kb = 0;
dc->clk_mgr->funcs->update_clocks(
dc->clk_mgr,
@@ -1829,9 +1830,16 @@ void dcn20_prepare_bandwidth(
&context->bw_ctx.bw.dcn.watermarks,
dc->res_pool->ref_clocks.dchub_ref_clock_inKhz / 1000,
false);
/* decrease compbuf size */
if (hubbub->funcs->program_compbuf_size)
hubbub->funcs->program_compbuf_size(hubbub, context->bw_ctx.bw.dcn.compbuf_size_kb, false);
if (hubbub->funcs->program_compbuf_size) {
if (context->bw_ctx.dml.ip.min_comp_buffer_size_kbytes)
compbuf_size_kb = context->bw_ctx.dml.ip.min_comp_buffer_size_kbytes;
else
compbuf_size_kb = context->bw_ctx.bw.dcn.compbuf_size_kb;
hubbub->funcs->program_compbuf_size(hubbub, compbuf_size_kb, false);
}
}
void dcn20_optimize_bandwidth(

1
drivers/gpu/drm/amd/display/dc/dml/display_mode_structs.h
View File

@@ -141,6 +141,7 @@ struct _vcs_dpi_ip_params_st {
unsigned int odm_capable;
unsigned int rob_buffer_size_kbytes;
unsigned int det_buffer_size_kbytes;
unsigned int min_comp_buffer_size_kbytes;
unsigned int dpte_buffer_size_in_pte_reqs_luma;
unsigned int dpte_buffer_size_in_pte_reqs_chroma;
unsigned int pde_proc_buffer_size_64k_reqs;