[PATCH 22/33] drm/amd/display: Keep PHY active for DP displays on DCN31

[Alan Liu]

From: Nicholas Kazlauskas <nicholas.kazlaus...@amd.com>

[Why & How]
Port of a change that went into DCN314 to keep the PHY enabled
when we have a connected and active DP display.

The PHY can hang if PHY refclk is disabled inadvertently.

Cc: Mario Limonciello <mario.limoncie...@amd.com>
Cc: Alex Deucher <alexander.deuc...@amd.com>
Cc: sta...@vger.kernel.org
Reviewed-by: Josip Pavic <josip.pa...@amd.com>
Acked-by: Alan Liu <haoping....@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlaus...@amd.com>
---
 drivers/gpu/drm/amd/display/dc/clk_mgr/dcn31/dcn31_clk_mgr.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn31/dcn31_clk_mgr.c 
b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn31/dcn31_clk_mgr.c
index 7ccd96959256..3db4ef564b99 100644
--- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn31/dcn31_clk_mgr.c
+++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn31/dcn31_clk_mgr.c
@@ -87,6 +87,11 @@ static int dcn31_get_active_display_cnt_wa(
                                stream->signal == SIGNAL_TYPE_DVI_SINGLE_LINK ||
                                stream->signal == SIGNAL_TYPE_DVI_DUAL_LINK)
                        tmds_present = true;
+
+               /* Checking stream / link detection ensuring that PHY is 
active*/
+               if (dc_is_dp_signal(stream->signal) && !stream->dpms_off)
+                       display_count++;
+
        }
 
        for (i = 0; i < dc->link_count; i++) {
-- 
2.34.1