[PATCH 12/16] board: stm32mp1: add timeout for I/O compensation ready

[Patrick Delaunay]

This patch avoids infinite loop when I/O compensation failed,
it adds a 1s timeout to detect error.

Signed-off-by: Patrick Delaunay <patrick.delau...@st.com>
---

 board/st/stm32mp1/stm32mp1.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/board/st/stm32mp1/stm32mp1.c b/board/st/stm32mp1/stm32mp1.c
index fff4cef2c2..75aac6d66c 100644
--- a/board/st/stm32mp1/stm32mp1.c
+++ b/board/st/stm32mp1/stm32mp1.c
@@ -35,6 +35,7 @@
 #include <asm/arch/sys_proto.h>
 #include <jffs2/load_kernel.h>
 #include <linux/err.h>
+#include <linux/iopoll.h>
 #include <power/regulator.h>
 #include <usb/dwc2_udc.h>
 
@@ -473,10 +474,10 @@ static void sysconf_init(void)
        struct udevice *pwr_dev;
        struct udevice *pwr_reg;
        struct udevice *dev;
-       int ret;
        u32 otp = 0;
 #endif
-       u32 bootr;
+       int ret;
+       u32 bootr, val;
 
        syscfg = (u8 *)syscon_get_first_range(STM32MP_SYSCON_SYSCFG);
 
@@ -553,8 +554,15 @@ static void sysconf_init(void)
         */
        writel(SYSCFG_CMPENSETR_MPU_EN, syscfg + SYSCFG_CMPENSETR);
 
-       while (!(readl(syscfg + SYSCFG_CMPCR) & SYSCFG_CMPCR_READY))
-               ;
+       /* poll until ready (1s timeout) */
+       ret = readl_poll_timeout(syscfg + SYSCFG_CMPCR, val,
+                                val & SYSCFG_CMPCR_READY,
+                                1000000);
+       if (ret) {
+               pr_err("SYSCFG: I/O compensation failed, timeout.\n");
+               led_error_blink(10);
+       }
+
        clrbits_le32(syscfg + SYSCFG_CMPCR, SYSCFG_CMPCR_SW_CTRL);
 #endif
 }
-- 
2.17.1