linux-kernel - [PATCH v3 1/8] drm/msm/dpu: don't overwrite CTL_MERGE_3D

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Message-Id: <20250307-dpu-active-ctl-v3-1-5d20655f10ca@linaro.org>
Date: Fri, 07 Mar 2025 08:24:49 +0200
From: Dmitry Baryshkov <lumag@...nel.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, 
 Neil Armstrong <neil.armstrong@...aro.org>
Subject: [PATCH v3 1/8] drm/msm/dpu: don't overwrite CTL_MERGE_3D_ACTIVE
 register

From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

In case of complex pipelines (e.g. the forthcoming quad-pipe) the DPU
might use more that one MERGE_3D block for a single output.  Follow the
pattern and extend the CTL_MERGE_3D_ACTIVE active register instead of
simply writing new value there. Currently at most one MERGE_3D block is
being used, so this has no impact on existing targets.

Reviewed-by: Marijn Suijten <marijn.suijten@...ainline.org>
Tested-by: Neil Armstrong <neil.armstrong@...aro.org> # on SM8550-QRD
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
index 411a7cf088eb72f856940c09b0af9e108ccade4b..cef3bfaa4af82ebc55fb8cf76adef3075c7d73e3 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
@@ -563,6 +563,7 @@ static void dpu_hw_ctl_intf_cfg_v1(struct dpu_hw_ctl *ctx,
 	u32 wb_active = 0;
 	u32 cwb_active = 0;
 	u32 mode_sel = 0;
+	u32 merge_3d_active = 0;
 
 	/* CTL_TOP[31:28] carries group_id to collate CTL paths
 	 * per VM. Explicitly disable it until VM support is
@@ -578,6 +579,7 @@ static void dpu_hw_ctl_intf_cfg_v1(struct dpu_hw_ctl *ctx,
 	wb_active = DPU_REG_READ(c, CTL_WB_ACTIVE);
 	cwb_active = DPU_REG_READ(c, CTL_CWB_ACTIVE);
 	dsc_active = DPU_REG_READ(c, CTL_DSC_ACTIVE);
+	merge_3d_active = DPU_REG_READ(c, CTL_MERGE_3D_ACTIVE);
 
 	if (cfg->intf)
 		intf_active |= BIT(cfg->intf - INTF_0);
@@ -591,15 +593,15 @@ static void dpu_hw_ctl_intf_cfg_v1(struct dpu_hw_ctl *ctx,
 	if (cfg->dsc)
 		dsc_active |= cfg->dsc;
 
+	if (cfg->merge_3d)
+		merge_3d_active |= BIT(cfg->merge_3d - MERGE_3D_0);
+
 	DPU_REG_WRITE(c, CTL_TOP, mode_sel);
 	DPU_REG_WRITE(c, CTL_INTF_ACTIVE, intf_active);
 	DPU_REG_WRITE(c, CTL_WB_ACTIVE, wb_active);
 	DPU_REG_WRITE(c, CTL_CWB_ACTIVE, cwb_active);
 	DPU_REG_WRITE(c, CTL_DSC_ACTIVE, dsc_active);
-
-	if (cfg->merge_3d)
-		DPU_REG_WRITE(c, CTL_MERGE_3D_ACTIVE,
-			      BIT(cfg->merge_3d - MERGE_3D_0));
+	DPU_REG_WRITE(c, CTL_MERGE_3D_ACTIVE, merge_3d_active);
 
 	if (cfg->cdm)
 		DPU_REG_WRITE(c, CTL_CDM_ACTIVE, cfg->cdm);

-- 
2.39.5