linux-kernel - [PATCH 5.15 302/779] drm/vc4: dsi: Register dsi0 as the correct vc4 encoder type

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Date:   Mon, 15 Aug 2022 19:59:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Maxime Ripard <maxime@...no.tech>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 302/779] drm/vc4: dsi: Register dsi0 as the correct vc4 encoder type

From: Dave Stevenson <dave.stevenson@...pberrypi.com>

[ Upstream commit 4d9273c978d4c1af15d7874c10c732ec83d444d0 ]

vc4_dsi was registering both dsi0 and dsi1 as VC4_ENCODER_TYPE_DSI1
which seemed to work OK for a single DSI display, but fails
if there are two DSI displays connected.

Update to register the correct type.

Fixes: 4078f5757144 ("drm/vc4: Add DSI driver")
Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
Link: https://lore.kernel.org/r/20220613144800.326124-15-maxime@cerno.tech
Signed-off-by: Maxime Ripard <maxime@...no.tech>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/vc4/vc4_dsi.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vc4/vc4_dsi.c b/drivers/gpu/drm/vc4/vc4_dsi.c
index 81a6c4e9576d..97a258c934af 100644
--- a/drivers/gpu/drm/vc4/vc4_dsi.c
+++ b/drivers/gpu/drm/vc4/vc4_dsi.c
@@ -1518,7 +1518,8 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data)
 		return -ENOMEM;
 
 	INIT_LIST_HEAD(&dsi->bridge_chain);
-	vc4_dsi_encoder->base.type = VC4_ENCODER_TYPE_DSI1;
+	vc4_dsi_encoder->base.type = dsi->variant->port ?
+			VC4_ENCODER_TYPE_DSI1 : VC4_ENCODER_TYPE_DSI0;
 	vc4_dsi_encoder->dsi = dsi;
 	dsi->encoder = &vc4_dsi_encoder->base.base;
 
-- 
2.35.1