linux-kernel - [v1] drm/msm/disp/dpu1: pin 1 crtc to 1 encoder

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Date:   Fri, 11 Nov 2022 05:56:18 -0800
From:   Kalyan Thota <quic_kalyant@...cinc.com>
To:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org
Cc:     Kalyan Thota <quic_kalyant@...cinc.com>,
        linux-kernel@...r.kernel.org, robdclark@...omium.org,
        dianders@...omium.org, swboyd@...omium.org,
        quic_vpolimer@...cinc.com, dmitry.baryshkov@...aro.org,
        quic_abhinavk@...cinc.com
Subject: [v1] drm/msm/disp/dpu1: pin 1 crtc to 1 encoder

Pin each crtc with one encoder. This arrangement will
disallow crtc switching between encoders and also will
facilitate to advertise certain features on crtc based
on encoder type.

Changes in v1:
- use drm_for_each_encoder macro while iterating through
  encoder list (Dmitry)

Signed-off-by: Kalyan Thota <quic_kalyant@...cinc.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index 7a5fabc..0d94eec0d 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -798,19 +798,20 @@ static int _dpu_kms_drm_obj_init(struct dpu_kms *dpu_kms)
 	max_crtc_count = min(max_crtc_count, primary_planes_idx);
 
 	/* Create one CRTC per encoder */
-	for (i = 0; i < max_crtc_count; i++) {
-		crtc = dpu_crtc_init(dev, primary_planes[i], cursor_planes[i]);
-		if (IS_ERR(crtc)) {
-			ret = PTR_ERR(crtc);
-			return ret;
+	i = 0;
+	drm_for_each_encoder(encoder, dev) {
+		if (i < max_crtc_count) {
+			crtc = dpu_crtc_init(dev, primary_planes[i], cursor_planes[i]);
+			if (IS_ERR(crtc)) {
+				ret = PTR_ERR(crtc);
+				return ret;
+			}
+			priv->crtcs[priv->num_crtcs++] = crtc;
+			encoder->possible_crtcs = 1 << drm_crtc_index(crtc);
 		}
-		priv->crtcs[priv->num_crtcs++] = crtc;
+		i++;
 	}
 
-	/* All CRTCs are compatible with all encoders */
-	drm_for_each_encoder(encoder, dev)
-		encoder->possible_crtcs = (1 << priv->num_crtcs) - 1;
-
 	return 0;
 }
 
-- 
2.7.4