SHIM_CNTL
writel(reg, csi->shim + SHIM_CNTL);
writel(0, csi->shim + SHIM_CNTL);
writel(0, csi->shim + SHIM_CNTL);
writel(reg, csi->shim + SHIM_CNTL);
writel(0, csi->shim + SHIM_CNTL);