linux-kernel - [PATCH v3 19/38] drm/msm/dp: no need to update tu calculation for mst

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Message-Id: <20250825-msm-dp-mst-v3-19-01faacfcdedd@oss.qualcomm.com>
Date: Mon, 25 Aug 2025 22:16:05 +0800
From: Yongxing Mou <yongxing.mou@....qualcomm.com>
To: Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Yongxing Mou <yongxing.mou@....qualcomm.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>
Subject: [PATCH v3 19/38] drm/msm/dp: no need to update tu calculation for
 mst

From: Abhinav Kumar <quic_abhinavk@...cinc.com>

DP stream is transmitted in transfer units only for SST
case there is no need to calculate and program TU parameters
for MST case. Skip the TU programming for MST cases.

Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
Signed-off-by: Yongxing Mou <yongxing.mou@....qualcomm.com>
---
 drivers/gpu/drm/msm/dp/dp_ctrl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
index d562377a8d2846099bf0f8757128978a162745c3..c313a3b4853a1571c43a9f3c9e981fbc22d51d55 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
@@ -2685,7 +2685,8 @@ int msm_dp_ctrl_on_stream(struct msm_dp_ctrl *msm_dp_ctrl, struct msm_dp_panel *
 
 	msm_dp_panel_clear_dsc_dto(msm_dp_panel);
 
-	msm_dp_ctrl_setup_tr_unit(ctrl);
+	if (!ctrl->mst_active)
+		msm_dp_ctrl_setup_tr_unit(ctrl);
 
 	msm_dp_write_link(ctrl, REG_DP_STATE_CTRL, DP_STATE_CTRL_SEND_VIDEO);
 

-- 
2.34.1