[SRU][J:linux-xilinx-zynqmp][PATCH 1/1] drm: xlnx: dp: Reset DisplayPort IP

[Emil Renner Berthing]

Wei-Lin Chang wrote:
> From: Rohit Visavalia <rohit.visavalia at amd.com>
>
> BugLink: https://bugs.launchpad.net/bugs/2114250
>
> Assert DisplayPort reset signal before deasserting,
> it is to clear out any registers programmed before booting kernel.
>
> Signed-off-by: Rohit Visavalia <rohit.visavalia at amd.com>
> Reviewed-by: Vishal Sagar <vishal.sagar at amd.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen at ideasonboard.com>
> Link: https://patchwork.freedesktop.org/patch/msgid/20240216124043.1226713-1-rohit.visavalia@amd.com
> (cherry picked from commit be318d01a90366029e181068e8857c6252e1fadc)

nit: the context changed, so this is really a backport

> Signed-off-by: Wei-Lin Chang <weilin.chang at canonical.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 2ebb8e367d15..a351b85cc6df 100644
> --- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
> +++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
> @@ -1922,6 +1922,10 @@ int zynqmp_dp_probe(struct platform_device *pdev)
>  		return dev_err_probe(dp->dev, PTR_ERR(dp->reset),
>  			"failed to get reset: %ld\n", PTR_ERR(dp->reset));
>
> +	ret = zynqmp_dp_reset(dp, true);
> +	if (ret < 0)
> +		return ret;
> +
>  	ret = zynqmp_dp_reset(dp, false);
>  	if (ret < 0)
>  		return ret;
> --
> 2.43.0
>
>
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