[PATCH 5/8] drm/msm/dpu1: Support wider writeback width in dual-WB case

[Jun Nie]

Current width limit is 2560 with single WB interface. 2 WB interfaces
can double the limit in quad-pipe topology case.

Signed-off-by: Jun Nie <jun.nie@xxxxxxxxxx>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c | 12 ++++--------
 1 file changed, 4 insertions(+), 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 e7b09013ae4c..b1177e4bd16e 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c
@@ -14,15 +14,11 @@ static int dpu_wb_conn_get_modes(struct drm_connector *connector)
 	struct drm_device *dev = connector->dev;
 	struct msm_drm_private *priv = dev->dev_private;
 	struct dpu_kms *dpu_kms = to_dpu_kms(priv->kms);
+	/* we support dual-WB at most so far */
+	int wb_count = min(2, dpu_kms->catalog->wb_count);
 
-	/*
-	 * 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,
+			wb_count * dpu_kms->catalog->wb->maxlinewidth,
 			dev->mode_config.max_height);
 }
 

-- 
2.53.0