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MIPI DSI Hsync end packet (0x31) setting problem

Dear all

We have set register vaule below on dsi.c

 r = FLD_MOD(r, 1, 15, 15);      /* VP_VSYNC_START */ 

r = FLD_MOD(r, 1, 16, 16);      /* VP_VSYNC_END */  

r = FLD_MOD(r, 1, 17, 17);      /* VP_HSYNC_START */

r = FLD_MOD(r, 1, 18, 18);      /* VP_HSYNC_END */  

we have 2 question here. 

1. we only catch 0x31 on display times . but we have 3 0x21 packet here.

0x01 -> 0x11 -> 0x21 -> 0x21 -> 0x21 -> 0x31 -> (pixel data) -> EOT 

2. We haven't seem any Hsync start and Hsync end between Vsync Start and Vsync end

 

ideal pattern : 0x01 ->  0x21-> 0x31 -> 0x21 -> 0x31->   0x11 

Real Pattern :  0x01 ->   0x11 

Please refer pic below.

thank you.