zynq: slcr: Disable all level shifters
Disable all level shifters before enabling
the PS-to-PL level shifters as it would
be good to disable all level shifters before
enabling the PS-to-PL in order to ensure that
it is in proper state
Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/arm/cpu/armv7/zynq/slcr.c b/arch/arm/cpu/armv7/zynq/slcr.c
index 2521589..05f4099 100644
--- a/arch/arm/cpu/armv7/zynq/slcr.c
+++ b/arch/arm/cpu/armv7/zynq/slcr.c
@@ -129,11 +129,18 @@
void zynq_slcr_devcfg_disable(void)
{
+ u32 reg_val;
+
zynq_slcr_unlock();
/* Disable AXI interface by asserting FPGA resets */
writel(0xF, &slcr_base->fpga_rst_ctrl);
+ /* Disable Level shifters before setting PS-PL */
+ reg_val = readl(&slcr_base->lvl_shftr_en);
+ reg_val &= ~0xF;
+ writel(reg_val, &slcr_base->lvl_shftr_en);
+
/* Set Level Shifters DT618760 */
writel(0xA, &slcr_base->lvl_shftr_en);