[PATCH V4 37/44] imx8ulp: soc: correct reset cause

[Peng Fan (OSS)]

From: Peng Fan <peng....@nxp.com>

The CMC1 SRS reflects the current reset cause, not SSRS.

Then you could get "Reset cause: WARM-WDG" when issue reset in U-Boot.

Reviewed-by: Ye Li <ye...@nxp.com>
Signed-off-by: Peng Fan <peng....@nxp.com>
---
 arch/arm/mach-imx/imx8ulp/soc.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/arch/arm/mach-imx/imx8ulp/soc.c b/arch/arm/mach-imx/imx8ulp/soc.c
index 0728cb9847..9bdbe3c846 100644
--- a/arch/arm/mach-imx/imx8ulp/soc.c
+++ b/arch/arm/mach-imx/imx8ulp/soc.c
@@ -149,8 +149,6 @@ enum bt_mode get_boot_mode(void)
 #define CMC_SRS_POR                       BIT(1)
 #define CMC_SRS_WUP                       BIT(0)
 
-static u32 reset_cause = -1;
-
 static char *get_reset_cause(char *ret)
 {
        u32 cause1, cause = 0, srs = 0;
@@ -163,9 +161,7 @@ static char *get_reset_cause(char *ret)
        srs = readl(reg_srs);
        cause1 = readl(reg_ssrs);
 
-       reset_cause = cause1;
-
-       cause = cause1 & (CMC_SRS_POR | CMC_SRS_WUP | CMC_SRS_WARM);
+       cause = srs & (CMC_SRS_POR | CMC_SRS_WUP | CMC_SRS_WARM);
 
        switch (cause) {
        case CMC_SRS_POR:
@@ -175,7 +171,7 @@ static char *get_reset_cause(char *ret)
                sprintf(ret, "%s", "WUP");
                break;
        case CMC_SRS_WARM:
-               cause = cause1 & (CMC_SRS_WDG | CMC_SRS_SW |
+               cause = srs & (CMC_SRS_WDG | CMC_SRS_SW |
                        CMC_SRS_JTAG_RST);
                switch (cause) {
                case CMC_SRS_WDG:
@@ -193,7 +189,7 @@ static char *get_reset_cause(char *ret)
                }
                break;
        default:
-               sprintf(ret, "%s-%X", "UNKN", cause1);
+               sprintf(ret, "%s-%X", "UNKN", srs);
                break;
        }
 
-- 
2.30.0