This is a note to let you know that I've just added the patch titled
drm/amd/display: use uclk pstate latency for fw assisted mclk validation dcn32
to the 6.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amd-display-use-uclk-pstate-latency-for-fw-assis.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 0c1e3577bdc59c024e42824b68f4dba2d31c0c33
Author: Dillon Varone <Dillon.Varone@xxxxxxx>
Date: Thu Nov 3 18:38:13 2022 -0400
drm/amd/display: use uclk pstate latency for fw assisted mclk validation dcn32
[ Upstream commit c149947b188c651b943c1d8ca1494d1a98a3e27f ]
[WHY?]
DCN32 uses fclk pstate watermarks for dummy pstate, and must always be
supported.
[HOW?]
Validation needs to be run with fclk pstate latency set
as the dummy pstate latency to get correct prefetch and bandwidth outputs.
Reviewed-by: Jun Lei <Jun.Lei@xxxxxxx>
Acked-by: Tom Chung <chiahsuan.chung@xxxxxxx>
Signed-off-by: Dillon Varone <Dillon.Varone@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c b/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
index b9d3a4000c3d..6ed76e194423 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
@@ -1700,6 +1700,12 @@ void dcn32_calculate_wm_and_dlg_fpu(struct dc *dc, struct dc_state *context,
*/
context->bw_ctx.dml.soc.dram_clock_change_latency_us =
dc->clk_mgr->bw_params->wm_table.nv_entries[WM_A].dml_input.pstate_latency_us;
+ /* For DCN32/321 need to validate with fclk pstate change latency equal to dummy so
+ * prefetch is scheduled correctly to account for dummy pstate.
+ */
+ if (dummy_latency_index == 0)
+ context->bw_ctx.dml.soc.fclk_change_latency_us =
+ dc->clk_mgr->bw_params->dummy_pstate_table[dummy_latency_index].dummy_pstate_latency_us;
dcn32_internal_validate_bw(dc, context, pipes, &pipe_cnt, &vlevel, false);
maxMpcComb = context->bw_ctx.dml.vba.maxMpcComb;
dcfclk = context->bw_ctx.dml.vba.DCFCLKState[vlevel][context->bw_ctx.dml.vba.maxMpcComb];
@@ -1879,6 +1885,10 @@ void dcn32_calculate_wm_and_dlg_fpu(struct dc *dc, struct dc_state *context,
context->perf_params.stutter_period_us = context->bw_ctx.dml.vba.StutterPeriod;
+ if (context->bw_ctx.bw.dcn.clk.fw_based_mclk_switching && dummy_latency_index == 0)
+ context->bw_ctx.dml.soc.fclk_change_latency_us =
+ dc->clk_mgr->bw_params->dummy_pstate_table[dummy_latency_index].dummy_pstate_latency_us;
+
dcn32_calculate_dlg_params(dc, context, pipes, pipe_cnt, vlevel);
if (!pstate_en)
@@ -1886,8 +1896,12 @@ void dcn32_calculate_wm_and_dlg_fpu(struct dc *dc, struct dc_state *context,
context->bw_ctx.dml.soc.dram_clock_change_latency_us =
dc->clk_mgr->bw_params->wm_table.nv_entries[WM_A].dml_input.pstate_latency_us;
- if (context->bw_ctx.bw.dcn.clk.fw_based_mclk_switching)
+ if (context->bw_ctx.bw.dcn.clk.fw_based_mclk_switching) {
dcn30_setup_mclk_switch_using_fw_based_vblank_stretch(dc, context);
+ if (dummy_latency_index == 0)
+ context->bw_ctx.dml.soc.fclk_change_latency_us =
+ dc->clk_mgr->bw_params->wm_table.nv_entries[WM_A].dml_input.fclk_change_latency_us;
+ }
}
static void dcn32_get_optimal_dcfclk_fclk_for_uclk(unsigned int uclk_mts,
