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[tmp] why pl080 dmacv need change max lli Num

tmp_todo crifan 524浏览 0评论

0x3c00 = 15360
0x3000 = 12288

0x168 = 360
0x168 X 4 = 1440

720 * 288     = 207,360 -> words
720 * 288 * 4 = 829,440 -> bytes

(720 * 288 * 4) / 0x168 = 829,440 / 360 = 2,304 = 0x900
0x3000 / sizeof(LLI) = 12288 / 16 = 768
0x3c00 / sizeof(LLI) = 15360 / 16 = 960
==>> 2304 >> 768, waring : need to increase MAX_NUM_TSFR_LLIS from 0x%08x to 0x%08x

(720 * 288) / 0x168 = 207,360 / 360 = 576 = 0x240
0x3000 / sizeof(LLI) = 12288 / 16 = 768
==>> 576 << 768, so no waring.

2^12=0x1000=4096 => max allowable = 0xFFF=4095

per lli, max allow and OK is, such as 0xFF0=4080

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