linux-kernel - [PATCH 4/7] drm/msm/dpu: use single CTL if it is the only CTL returned by RM

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Message-Id: <20250220-dpu-active-ctl-v1-4-71ca67a564f8@linaro.org>
Date: Thu, 20 Feb 2025 12:26:21 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Rob Clark <robdclark@...il.com>, 
 Abhinav Kumar <quic_abhinavk@...cinc.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
Subject: [PATCH 4/7] drm/msm/dpu: use single CTL if it is the only CTL
 returned by RM

On DPU >= 5.0 CTL blocks were reworked in order to support using a
single CTL for all outputs. In preparation of reworking the RM code to
return single CTL make sure that dpu_encoder can cope with that.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 5172ab4dea995a154cd88d05c3842d7425fc34ce..666a755dc74b41b79fa1bb2878339592478e4333 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -1283,7 +1283,11 @@ static void dpu_encoder_virt_atomic_mode_set(struct drm_encoder *drm_enc,
 			return;
 		}
 
-		phys->hw_ctl = i < num_ctl ? to_dpu_hw_ctl(hw_ctl[i]) : NULL;
+		/* Use first (and only) CTL if active CTLs are supported */
+		if (num_ctl == 1)
+			phys->hw_ctl = to_dpu_hw_ctl(hw_ctl[0]);
+		else
+			phys->hw_ctl = i < num_ctl ? to_dpu_hw_ctl(hw_ctl[i]) : NULL;
 		if (!phys->hw_ctl) {
 			DPU_ERROR_ENC(dpu_enc,
 				"no ctl block assigned at idx: %d\n", i);

-- 
2.39.5