linux-kernel - [PATCH] drm/imx/dcss: get rid of HPD warning message

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Message-Id: <20220721120912.6639-1-laurentiu.palcu@oss.nxp.com>
Date:   Thu, 21 Jul 2022 15:09:12 +0300
From:   Laurentiu Palcu <laurentiu.palcu@....nxp.com>
To:     Laurentiu Palcu <laurentiu.palcu@....nxp.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Paul Cercueil <paul@...pouillou.net>,
        Nikita Yushchenko <nikita.yoush@...entembedded.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/imx/dcss: get rid of HPD warning message

When DCSS + MIPI_DSI is used, and the last bridge in the chain supports
HPD, we can see a "Hot plug detection already enabled" warning stack
trace dump that's thrown when DCSS is initialized.

The problem appeared when HPD was enabled by default in the
bridge_connector initialization, which made the
drm_bridge_connector_enable_hpd() call, in DCSS init path, redundant.
So, let's remove that call.

Fixes: 09077bc311658 ("drm/bridge_connector: enable HPD by default if supported")
Signed-off-by: Laurentiu Palcu <laurentiu.palcu@....nxp.com>
---
 drivers/gpu/drm/imx/dcss/dcss-kms.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/gpu/drm/imx/dcss/dcss-kms.c b/drivers/gpu/drm/imx/dcss/dcss-kms.c
index 9b84df34a6a12..8cf3352d88582 100644
--- a/drivers/gpu/drm/imx/dcss/dcss-kms.c
+++ b/drivers/gpu/drm/imx/dcss/dcss-kms.c
@@ -142,8 +142,6 @@ struct dcss_kms_dev *dcss_kms_attach(struct dcss_dev *dcss)
 
 	drm_kms_helper_poll_init(drm);
 
-	drm_bridge_connector_enable_hpd(kms->connector);
-
 	ret = drm_dev_register(drm, 0);
 	if (ret)
 		goto cleanup_crtc;
-- 
2.17.1