SHIM_DMACNTX
writel(0, csi->shim + SHIM_DMACNTX(ctx->idx));
writel(0, csi->shim + SHIM_DMACNTX(ctx->idx));
writel(reg, csi->shim + SHIM_DMACNTX(ctx->idx));
writel(0, csi->shim + SHIM_DMACNTX(ctx->idx));