hsu_chan_writel
hsu_chan_writel(hsuc, HSU_CH_DCR, dcr);
hsu_chan_writel(hsuc, HSU_CH_DCR, 0);
hsu_chan_writel(hsuc, HSU_CH_CR, 0);
hsu_chan_writel(hsuc, HSU_CH_CR, cr);
hsu_chan_writel(hsuc, HSU_CH_DCR, 0);
hsu_chan_writel(hsuc, HSU_CH_BSR, bsr);
hsu_chan_writel(hsuc, HSU_CH_MTSR, mtsr);
hsu_chan_writel(hsuc, HSU_CH_DxSAR(i), desc->sg[i].addr);
hsu_chan_writel(hsuc, HSU_CH_DxTSR(i), desc->sg[i].len);