linux-kernel - [PATCH 1/4] drm/msm/disp/dpu1: pin 1 crtc to 1 encoder

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Message-Id: <1667996206-4153-1-git-send-email-quic_kalyant@quicinc.com>
Date:   Wed,  9 Nov 2022 04:16:43 -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: [PATCH 1/4] 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.

Signed-off-by: Kalyan Thota <quic_kalyant@...cinc.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 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..552a89c 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -798,19 +798,19 @@ 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 */
+	encoder = list_first_entry(&(dev)->mode_config.encoder_list,
+		struct drm_encoder, head);
 	for (i = 0; i < max_crtc_count; i++) {
 		crtc = dpu_crtc_init(dev, primary_planes[i], cursor_planes[i]);
-		if (IS_ERR(crtc)) {
+		if (IS_ERR(crtc) || IS_ERR_OR_NULL(encoder)) {
 			ret = PTR_ERR(crtc);
 			return ret;
 		}
 		priv->crtcs[priv->num_crtcs++] = crtc;
+		encoder->possible_crtcs = 1 << drm_crtc_index(crtc);
+		encoder = list_next_entry(encoder, head);
 	}
 
-	/* 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