[PATCH] drm/amd/display: Fix fclk idle state

[Deucher, Alexander]

Acked-by: Alex Deucher <alexander.deucher at amd.com>

________________________________
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Roman.Li at amd.com <Roman.Li at amd.com>
Sent: Tuesday, January 29, 2019 3:16:53 PM
To: amd-gfx at lists.freedesktop.org; Xu, Feifei; Quan, Evan
Cc: Chan, Carl; Wentland, Harry; Li, Roman
Subject: [PATCH] drm/amd/display: Fix fclk idle state

From: Roman Li <Roman.Li at amd.com>

[Why]
The earlier change 'Fix 6x4K displays' led to fclk value
idling at higher DPM level.

[How]
Apply the fix only to respective multi-display configuration.

Signed-off-by: Roman Li <Roman.Li at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dce/dce_clk_mgr.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/dce/dce_clk_mgr.c
index 3c52a4fc921d..bbe051736a18 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_clk_mgr.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_clk_mgr.c
@@ -627,7 +627,15 @@ static void dce11_pplib_apply_display_requirements(
                         dc,
                         context->bw.dce.sclk_khz);

-       pp_display_cfg->min_dcfclock_khz = pp_display_cfg->min_engine_clock_khz;
+       /*
+        * As workaround for >4x4K lightup set dcfclock to min_engine_clock value.
+        * This is not required for less than 5 displays,
+        * thus don't request decfclk in dc to avoid impact
+        * on power saving.
+        *
+        */
+       pp_display_cfg->min_dcfclock_khz = (context->stream_count > 4)?
+                       pp_display_cfg->min_engine_clock_khz : 0;

         pp_display_cfg->min_engine_clock_deep_sleep_khz
                         = context->bw.dce.sclk_deep_sleep_khz;
--
2.17.1

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