linux-kernel - [PATCH] drm: xlnx: dp: Reset DisplayPort IP

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Date: Fri, 16 Feb 2024 04:40:43 -0800
From: Rohit Visavalia <rohit.visavalia@....com>
To: <gregkh@...uxfoundation.org>, <laurent.pinchart@...asonboard.com>,
	<maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
	<tzimmermann@...e.de>, <airlied@...il.com>, <daniel@...ll.ch>,
	<michal.simek@....com>, <dri-devel@...ts.freedesktop.org>,
	<linux-arm-kernel@...ts.infradead.org>
CC: <linux-kernel@...r.kernel.org>
Subject: [PATCH] drm: xlnx: dp: Reset DisplayPort IP

Assert DisplayPort reset signal before deasserting,
it is to clear out any registers programmed before booting kernel.

Signed-off-by: Rohit Visavalia <rohit.visavalia@....com>
---
 drivers/gpu/drm/xlnx/zynqmp_dp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
index 1846c4971fd8..5a40aa1d4283 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
@@ -1714,6 +1714,10 @@ int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub)
 		goto err_free;
 	}
 
+	ret = zynqmp_dp_reset(dp, true);
+	if (ret < 0)
+		return ret;
+
 	ret = zynqmp_dp_reset(dp, false);
 	if (ret < 0)
 		goto err_free;
-- 
2.25.1