linux-kernel - [PATCH 5.15 183/201] drm/amd/display: Optimize bandwidth on following fast update

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Date:   Wed, 27 Jul 2022 18:11:27 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Bhawanpreet Lakha <bhawanpreet.lakha@....com>,
        Mikita Lipski <mikita.lipski@....com>,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        Daniel Wheeler <daniel.wheeler@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Mario Limonciello <Mario.Limonciello@....com>
Subject: [PATCH 5.15 183/201] drm/amd/display: Optimize bandwidth on following fast update

From: Nicholas Kazlauskas <nicholas.kazlauskas@....com>

commit 34316c1e561db0b24e341029f04a5a5bead9a7bc upstream.

[Why]
The current call to optimize_bandwidth never occurs because flip is
always pending from the FULL and FAST updates.

[How]
Optimize on the following flip when it's a FAST update and we know we
aren't going to be modifying the clocks again.

Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@....com>
Acked-by: Mikita Lipski <mikita.lipski@....com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@....com>
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Cc: Mario Limonciello <Mario.Limonciello@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c |   17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -1788,6 +1788,11 @@ void dc_post_update_surfaces_to_stream(s
 
 	post_surface_trace(dc);
 
+	if (dc->ctx->dce_version >= DCE_VERSION_MAX)
+		TRACE_DCN_CLOCK_STATE(&context->bw_ctx.bw.dcn.clk);
+	else
+		TRACE_DCE_CLOCK_STATE(&context->bw_ctx.bw.dce);
+
 	if (is_flip_pending_in_pipes(dc, context))
 		return;
 
@@ -2974,6 +2979,9 @@ void dc_commit_updates_for_stream(struct
 			if (new_pipe->plane_state && new_pipe->plane_state != old_pipe->plane_state)
 				new_pipe->plane_state->force_full_update = true;
 		}
+	} else if (update_type == UPDATE_TYPE_FAST) {
+		/* Previous frame finished and HW is ready for optimization. */
+		dc_post_update_surfaces_to_stream(dc);
 	}
 
 
@@ -3030,15 +3038,6 @@ void dc_commit_updates_for_stream(struct
 				pipe_ctx->plane_state->force_full_update = false;
 		}
 	}
-	/*let's use current_state to update watermark etc*/
-	if (update_type >= UPDATE_TYPE_FULL) {
-		dc_post_update_surfaces_to_stream(dc);
-
-		if (dc_ctx->dce_version >= DCE_VERSION_MAX)
-			TRACE_DCN_CLOCK_STATE(&context->bw_ctx.bw.dcn.clk);
-		else
-			TRACE_DCE_CLOCK_STATE(&context->bw_ctx.bw.dce);
-	}
 
 	return;