linux-kernel - [RFC v2 10/20] drm/nouveau/kms: Use new drm_dp_has

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Date:   Thu, 20 Aug 2020 14:30:02 -0400
From:   Lyude Paul <lyude@...hat.com>
To:     dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org
Cc:     Ben Skeggs <bskeggs@...hat.com>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        linux-kernel@...r.kernel.org (open list)
Subject: [RFC v2 10/20] drm/nouveau/kms: Use new drm_dp_has_mst() helper for checking MST caps

Signed-off-by: Lyude Paul <lyude@...hat.com>
Reviewed-by: Ben Skeggs <bskeggs@...hat.com>
---
 drivers/gpu/drm/nouveau/nouveau_dp.c | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c
index 032afc73e2a33..201c0b4335563 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dp.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dp.c
@@ -44,7 +44,6 @@ nouveau_dp_probe_dpcd(struct nouveau_connector *nv_connector,
 	struct nv50_mstm *mstm = NULL;
 	int ret;
 	u8 *dpcd = outp->dp.dpcd;
-	u8 tmp;
 
 	ret = drm_dp_dpcd_read(aux, DP_DPCD_REV, dpcd, DP_RECEIVER_CAP_SIZE);
 	if (ret == DP_RECEIVER_CAP_SIZE && dpcd[DP_DPCD_REV]) {
@@ -56,19 +55,10 @@ nouveau_dp_probe_dpcd(struct nouveau_connector *nv_connector,
 		return connector_status_disconnected;
 	}
 
-	if (nouveau_mst)
+	if (nouveau_mst) {
 		mstm = outp->dp.mstm;
-
-	if (mstm) {
-		if (dpcd[DP_DPCD_REV] >= DP_DPCD_REV_12) {
-			ret = drm_dp_dpcd_readb(aux, DP_MSTM_CAP, &tmp);
-			if (ret < 0)
-				return connector_status_disconnected;
-
-			mstm->can_mst = !!(tmp & DP_MST_CAP);
-		} else {
-			mstm->can_mst = false;
-		}
+		if (mstm)
+			mstm->can_mst = drm_dp_has_mst(aux, dpcd);
 	}
 
 	return connector_status_connected;
-- 
2.26.2