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authorWesley Chalmers <Wesley.Chalmers@amd.com>2023-02-28 13:48:00 -0500
committerAlex Deucher <alexander.deucher@amd.com>2023-04-26 22:27:26 -0400
commitce560ac40272a5c8b5b68a9d63a75edd9e66aed2 (patch)
tree365770256cab5ead4361ab17903b6ba90854b7b6
parent474f01015ffdb74e01c2eb3584a2822c64e7b2be (diff)
drm/amd/display: Block optimize on consecutive FAMS enables
[WHY] It is possible to commit state multiple times in rapid succession with FAMS enabled; if each of these commits were to set optimized_required, then the user may see latency. [HOW] fw_based_mclk_switching is currently not used in dc->clk_mgr; use it to track whether the current state has FAMS enabled; if it has, then do not disable FAMS in prepare_bandwidth, and do not set optimized_required. Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com> Signed-off-by: Wesley Chalmers <Wesley.Chalmers@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
-rw-r--r--drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c3
-rw-r--r--drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c22
2 files changed, 22 insertions, 3 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
index 6ce10fd4bb1a..422fbf79da64 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
@@ -2117,6 +2117,9 @@ void dcn20_optimize_bandwidth(
dc_dmub_srv_p_state_delegate(dc,
true, context);
context->bw_ctx.bw.dcn.clk.p_state_change_support = true;
+ dc->clk_mgr->clks.fw_based_mclk_switching = true;
+ } else {
+ dc->clk_mgr->clks.fw_based_mclk_switching = false;
}
dc->clk_mgr->funcs->update_clocks(
diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
index 0411867654dd..8263a07f265f 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
@@ -983,9 +983,13 @@ void dcn30_set_disp_pattern_generator(const struct dc *dc,
}
void dcn30_prepare_bandwidth(struct dc *dc,
- struct dc_state *context)
+ struct dc_state *context)
{
- if (context->bw_ctx.bw.dcn.clk.fw_based_mclk_switching) {
+ bool p_state_change_support = context->bw_ctx.bw.dcn.clk.p_state_change_support;
+ /* Any transition into an FPO config should disable MCLK switching first to avoid
+ * driver and FW P-State synchronization issues.
+ */
+ if (context->bw_ctx.bw.dcn.clk.fw_based_mclk_switching || dc->clk_mgr->clks.fw_based_mclk_switching) {
dc->optimized_required = true;
context->bw_ctx.bw.dcn.clk.p_state_change_support = false;
}
@@ -996,7 +1000,19 @@ void dcn30_prepare_bandwidth(struct dc *dc,
dc->clk_mgr->funcs->set_max_memclk(dc->clk_mgr, dc->clk_mgr->bw_params->clk_table.entries[dc->clk_mgr->bw_params->clk_table.num_entries - 1].memclk_mhz);
dcn20_prepare_bandwidth(dc, context);
+ /*
+ * enabled -> enabled: do not disable
+ * enabled -> disabled: disable
+ * disabled -> enabled: don't care
+ * disabled -> disabled: don't care
+ */
+ if (!context->bw_ctx.bw.dcn.clk.fw_based_mclk_switching)
+ dc_dmub_srv_p_state_delegate(dc, false, context);
- dc_dmub_srv_p_state_delegate(dc, false, context);
+ if (context->bw_ctx.bw.dcn.clk.fw_based_mclk_switching || dc->clk_mgr->clks.fw_based_mclk_switching) {
+ /* After disabling P-State, restore the original value to ensure we get the correct P-State
+ * on the next optimize. */
+ context->bw_ctx.bw.dcn.clk.p_state_change_support = p_state_change_support;
+ }
}