linux-kernel - [PATCH 4/5] drm/msm/dpu: Filter writeback modes using writeback maxlinewidth

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Message-Id: <20250514-max-mixer-width-v1-4-c8ba0d9bb858@oss.qualcomm.com>
Date: Wed, 14 May 2025 16:52:32 -0700
From: Jessica Zhang <jessica.zhang@....qualcomm.com>
To: Rob Clark <robdclark@...il.com>, Dmitry Baryshkov <lumag@...nel.org>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>
Cc: Abhinav Kumar <abhinav.kumar@....qualcomm.com>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Jessica Zhang <jessica.zhang@....qualcomm.com>
Subject: [PATCH 4/5] drm/msm/dpu: Filter writeback modes using writeback
 maxlinewidth

Since the max mixer width is not a strict hardware limit, use the actual
hardware limit (the writeback maxlinewidth) to filter modes.

Signed-off-by: Jessica Zhang <jessica.zhang@....qualcomm.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c
index 8ff496082902..0a198896f656 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c
@@ -14,14 +14,7 @@ static int dpu_wb_conn_get_modes(struct drm_connector *connector)
 	struct msm_drm_private *priv = dev->dev_private;
 	struct dpu_kms *dpu_kms = to_dpu_kms(priv->kms);
 
-	/*
-	 * We should ideally be limiting the modes only to the maxlinewidth but
-	 * on some chipsets this will allow even 4k modes to be added which will
-	 * fail the per SSPP bandwidth checks. So, till we have dual-SSPP support
-	 * and source split support added lets limit the modes based on max_mixer_width
-	 * as 4K modes can then be supported.
-	 */
-	return drm_add_modes_noedid(connector, dpu_kms->catalog->caps->max_mixer_width,
+	return drm_add_modes_noedid(connector, dpu_kms->catalog->wb->maxlinewidth,
 			dev->mode_config.max_height);
 }
 

-- 
2.49.0