workaround: add delay

Signed-off-by: Han Gao <gaohan@iscas.ac.cn>

diff --git a/board/thead/light-c910/spl.c b/board/thead/light-c910/spl.c
index 6b560cc544bd01c21011a356e21a6ea8419ae85a..66e3e07dccbc9ba862bd1819270b9527ee4327ea 100644 (file)
--- a/board/thead/light-c910/spl.c
+++ b/board/thead/light-c910/spl.c
@@ -310,6 +310,7 @@ void cpu_performance_enable(void)
        csr_write(CSR_MHCR, 0x17f); // clear bit7 to disable indirect brantch prediction
        csr_write(CSR_MXSTATUS, 0x638000);
        csr_write(CSR_MHINT, 0x6e30c | (1<<21) | (1<<22)); // set bit21 & bit 22 to close tlb & fence broadcast
+       mdelay(50); // workaround
 }
 
 static int bl1_img_have_head(unsigned long img_src_addr)