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Imx6 BT1120  720P progressive output issue

Question asked by Zi Li on Aug 23, 2018
Latest reply on Jul 11, 2019 by 星 李

Hi ,

We want 720P output on imx6Q platform , but met output issue .our platform ENV:

1. kernel 4.1.15 +manual path "L3.14.52_1.1.0_GA_bt656_output_patch".



we check the ITU-R BT1120 document  and progressive  scan like as bellow:


and we check the function code _ipu_dc_setup_bt656_progressive in  Ipu_disp.c,  we found that :

when send blank video on I-frame . it send whole line (bt656_v_start_width+bt656_v_end_width) by _ipu_dc_write_tmpl(ipu, microcode_addr, BMA, loop_frame_blank_line_times, 0, 0, 0, 0, 0, 0, 0);

we can't control the bank line (L2-L1) and (L6-L5), it is different on 720P and 1080P.  

Did you verify these code yet ? Kindly please give us advice or give me more information about these ,we requried question at several days ago at 

i.mx6 output bt1120 720P video, has some problem