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Date:   Sat, 7 Oct 2017 22:37:46 +0000
From:   "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Archit Taneja <architt@...eaurora.org>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Rob Clark <robdclark@...il.com>,
        "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
Subject: [PATCH review for 4.4 13/24] drm/msm/dsi: Set msm_dsi->encoders
 before initializing bridge

From: Archit Taneja <architt@...eaurora.org>

[ Upstream commit 0bb70b82c2f91e4667f3c617505235efd6d77e46 ]

The commit "drm: bridge: Link encoder and bridge in core code" updated
the drm_bridge_attach() API to also include the drm_encoder pointer
the bridge attaches to.

The func msm_dsi_manager_bridge_init() now relies on the drm_encoder
pointer stored in msm_dsi->encoders to pass the encoder to the bridge
API.

msm_dsi->encoders is unfortunately set after this function is called,
resulting in us passing a NULL pointer to drm_brigde_attach. This
results in an error and the DSI driver probe fails.

Move the initialization of msm_dsi->encoders[] a bit up. Also, don't
try to set the encoder's bridge. That's now managed by the bridge
API.

Cc: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Archit Taneja <architt@...eaurora.org>
Signed-off-by: Rob Clark <robdclark@...il.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/gpu/drm/msm/dsi/dsi.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi.c b/drivers/gpu/drm/msm/dsi/dsi.c
index 6edcd6f57e70..b36e12eb89ef 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.c
+++ b/drivers/gpu/drm/msm/dsi/dsi.c
@@ -205,6 +205,9 @@ int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
 		goto fail;
 	}
 
+	for (i = 0; i < MSM_DSI_ENCODER_NUM; i++)
+		msm_dsi->encoders[i] = encoders[i];
+
 	msm_dsi->bridge = msm_dsi_manager_bridge_init(msm_dsi->id);
 	if (IS_ERR(msm_dsi->bridge)) {
 		ret = PTR_ERR(msm_dsi->bridge);
@@ -213,11 +216,6 @@ int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
 		goto fail;
 	}
 
-	for (i = 0; i < MSM_DSI_ENCODER_NUM; i++) {
-		encoders[i]->bridge = msm_dsi->bridge;
-		msm_dsi->encoders[i] = encoders[i];
-	}
-
 	/*
 	 * check if the dsi encoder output is connected to a panel or an
 	 * external bridge. We create a connector only if we're connected to a
-- 
2.11.0

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