Patch "drm/amd/display: Do not set drr on pipe commit" has been added to the 6.4-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    drm/amd/display: Do not set drr on pipe commit

to the 6.4-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-do-not-set-drr-on-pipe-commit.patch
and it can be found in the queue-6.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 7bb8e4d3f15621da9814a92e5781b56afab4cd3e
Author: Wesley Chalmers <Wesley.Chalmers@xxxxxxx>
Date:   Thu Nov 3 22:29:31 2022 -0400

    drm/amd/display: Do not set drr on pipe commit
    
    [ Upstream commit e101bf95ea87ccc03ac2f48dfc0757c6364ff3c7 ]
    
    [WHY]
    Writing to DRR registers such as OTG_V_TOTAL_MIN on the same frame as a
    pipe commit can cause underflow.
    
    [HOW]
    Move DMUB p-state delegate into optimze_bandwidth; enabling FAMS sets
    optimized_required.
    
    This change expects that Freesync requests are blocked when
    optimized_required is true.
    
    Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>
    Signed-off-by: Wesley Chalmers <Wesley.Chalmers@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/dcn20/dcn20_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
index a621b6a27c1fc..1ed30eba152e1 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
@@ -2124,6 +2124,12 @@ void dcn20_optimize_bandwidth(
 	if (hubbub->funcs->program_compbuf_size)
 		hubbub->funcs->program_compbuf_size(hubbub, context->bw_ctx.bw.dcn.compbuf_size_kb, true);
 
+	if (context->bw_ctx.bw.dcn.clk.fw_based_mclk_switching) {
+		dc_dmub_srv_p_state_delegate(dc,
+			true, context);
+		context->bw_ctx.bw.dcn.clk.p_state_change_support = true;
+	}
+
 	dc->clk_mgr->funcs->update_clocks(
 			dc->clk_mgr,
 			context,
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 32121db2851e6..f923224e85fc6 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
@@ -985,11 +985,18 @@ void dcn30_set_disp_pattern_generator(const struct dc *dc,
 void dcn30_prepare_bandwidth(struct dc *dc,
 			     struct dc_state *context)
 {
+	if (context->bw_ctx.bw.dcn.clk.fw_based_mclk_switching) {
+		dc->optimized_required = true;
+		context->bw_ctx.bw.dcn.clk.p_state_change_support = false;
+	}
+
 	if (dc->clk_mgr->dc_mode_softmax_enabled)
 		if (dc->clk_mgr->clks.dramclk_khz <= dc->clk_mgr->bw_params->dc_mode_softmax_memclk * 1000 &&
 				context->bw_ctx.bw.dcn.clk.dramclk_khz > dc->clk_mgr->bw_params->dc_mode_softmax_memclk * 1000)
 			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);
+
+	dc_dmub_srv_p_state_delegate(dc, false, context);
 }