linux-kernel - [PATCH] drm/kms/atomic: Improved the func drm_atomic_set_crtc_for

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Message-Id: <20180730061450epcas5p137fd022ec7fda83eeadea2102a62ae4f~GEOMmSYCD1391313913epcas5p1G@epcas5p1.samsung.com>
Date:   Mon, 30 Jul 2018 11:44:15 +0530
From:   Satendra Singh Thakur <satendra.t@...sung.com>
To:     Gustavo Padovan <gustavo@...ovan.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     vineet.j@...sung.com, hemanshu.s@...sung.com, sst2005@...il.com,
        Satendra Singh Thakur <satendra.t@...sung.com>
Subject: [PATCH] drm/kms/atomic: Improved the func
 drm_atomic_set_crtc_for_connector

a. Used drm_atomic_get_crtc_state instead of drm_atomic_get_new_crtc_state.
   Anyway new_state and state are same, this should make no difference.
   This change will make the code of this func and the func
   drm_atomic_set_crtc_for_plane similar.
b. Added error checking after this func call
c. Currently conn_state->crtc is getting assigned a value at two places
   We can just reduce this assignment to one

Signed-off-by: Satendra Singh Thakur <satendra.t@...sung.com>
---
 drivers/gpu/drm/drm_atomic.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 895741e..907fb2d 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -1552,16 +1552,16 @@ drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
 		return 0;
 
 	if (conn_state->crtc) {
-		crtc_state = drm_atomic_get_new_crtc_state(conn_state->state,
+		crtc_state = drm_atomic_get_crtc_state(conn_state->state,
 							   conn_state->crtc);
+		if (IS_ERR(crtc_state))
+			return PTR_ERR(crtc_state);
 
 		crtc_state->connector_mask &=
 			~(1 << drm_connector_index(conn_state->connector));
 
 		drm_connector_put(conn_state->connector);
-		conn_state->crtc = NULL;
 	}
-
 	if (crtc) {
 		crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc);
 		if (IS_ERR(crtc_state))
@@ -1571,7 +1571,6 @@ drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
 			1 << drm_connector_index(conn_state->connector);
 
 		drm_connector_get(conn_state->connector);
-		conn_state->crtc = crtc;
 
 		DRM_DEBUG_ATOMIC("Link connector state %p to [CRTC:%d:%s]\n",
 				 conn_state, crtc->base.id, crtc->name);
@@ -1579,7 +1578,7 @@ drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
 		DRM_DEBUG_ATOMIC("Link connector state %p to [NOCRTC]\n",
 				 conn_state);
 	}
-
+	conn_state->crtc = crtc;
 	return 0;
 }
 EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector);
-- 
2.7.4