drivers: soc: andes: Fix an error for print_detailed_cause() on imprecise exception (torvalds#101)

To print error messages for imprecise exception, extract the field sdcause
in the CSR sdcause instead of reading the whole register.

Signed-off-by: Ben Zong-You Xie <[email protected]>

Reviewed-on: https://gitea.andestech.com/RD-SW/linux/pulls/101
Reviewed-by: Tim Shih-Ting OuYang <[email protected]>
Reviewed-by: Leo Yu-Chi Liang <[email protected]>
Reviewed-by: Dylan Dai-Rong Jhong <[email protected]>
Co-authored-by: Ben Zong-You Xie <[email protected]>
Co-committed-by: Ben Zong-You Xie <[email protected]>

Author: ben717-linux

drivers/soc/andes/dcause.c

@@ -45,6 +45,7 @@ void print_detailed_cause(long scause, unsigned long sdcause)
 		}
 	} else {
 		scause &= ~CAUSE_IRQ_FLAG;
+		sdcause &= SDCAUSE_DCAUSE_MASK;
 		switch (scause) {
 		case IRQ_IMPRECISE_ECC:
 			pr_info("The detailed trap cause: %s\n",

include/soc/andes/dcause.h

@@ -10,6 +10,8 @@
 #define IRQ_BUS_RW_TRANS	0x111
 #define IRQ_PMOVI		0x112
 
+#define SDCAUSE_DCAUSE_MASK	0x1f
+
 static const char *const sdcause_fetch_access[] = {
 	"Reserved",
 	"ECC/Parity error",