Rescale videos and then pad them using vaapi and hwaccel with ffmpeg in amd, linux

Question

This command, make videos to be padded first and then scale them afterwards. However, i want exactly the opposite, first to scale them and then to pad them. How I can do that?

rm a_*.mp4; for vids in *.mp4; do ffmpeg -hwaccel vaapi -hwaccel_output_format yuv420p -vaapi_device /dev/dri/renderD128 -i "$vids" -ss 0:00:00 -to 00:00:03  -vf  "format=nv12, pad=1080:1920:ow/2:oh/2:color=red, hwupload, scale_vaapi=w=1920:h=1080:format=nv12"  -c:v hevc_vaapi -video_track_timescale 90000 -rc_mode CQP -global_quality 20 -an "a_${vids/.*}.mp4"; done;

The error message is that:

Impossible to convert between the formats supported by the filter 'Parsed_scale_vaapi_2' and the filter 'auto_scale_1'

I tried this too but failed:

rm a_*.mp4; for vids in *.mp4; do ffmpeg -hwaccel vaapi -hwaccel_output_format yuv420p -vaapi_device /dev/dri/renderD128 -i "$vids" -ss 0:00:00 -to 00:00:03  -vf  "hwupload, scale_vaapi=w=1920:h=1080:format=nv12, hwdownload, pad=1080:1920:ow/2:oh/2:color=red"  -c:v hevc_vaapi -video_track_timescale 90000 -rc_mode CQP -global_quality 20 -an "a_${vids/.*}.mp4"; done;

UPDATE

I succeded with scale but not with scale_vaapi:

rm a_*.mp4; for vids in *.mp4; do ffmpeg -hwaccel vaapi -hwaccel_output_format yuv420p -vaapi_device /dev/dri/renderD128 -i "$vids" -ss 0:00:00 -to 00:00:03  -vf  "format=nv12, scale=height=1920:width=1080, pad=height=1920:width=1080:color=red,hwupload"  -c:v hevc_vaapi -video_track_timescale 90000 -rc_mode CQP -global_quality 20 -an "a_${vids/.*}.mp4"; done;