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drm: xlnx: dp: Reset DisplayPort IP

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

Signed-off-by: Rohit Visavalia <rohit.visavalia@amd.com>
Reviewed-by: Vishal Sagar <vishal.sagar@amd.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240216124043.1226713-1-rohit.visavalia@amd.com
This commit is contained in:
Rohit Visavalia 2024-02-16 04:40:43 -08:00 committed by Tomi Valkeinen
parent bf0390e2c9
commit be318d01a9
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/xlnx/zynqmp_dp.c
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@ -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;