[PATCH v4 09/11] lib: sbi: Counter info width should be zero indexed

[Atish Patra]

The mhpm bits represent the number of bits available in mhpmcounter
while counter width describes a zero indexed value. Fix the counter width
calculation.

Fixes: 13d40f21d588 ("lib: sbi: Add PMU support")

Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
Reviewed-by: Anup Patel <anup.patel at wdc.com>
Signed-off-by: Atish Patra <atish.patra at wdc.com>
---
 lib/sbi/sbi_pmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/sbi/sbi_pmu.c b/lib/sbi/sbi_pmu.c
index 007a7396ad85..e82d7539b896 100644
--- a/lib/sbi/sbi_pmu.c
+++ b/lib/sbi/sbi_pmu.c
@@ -648,7 +648,7 @@ int sbi_pmu_ctr_get_info(uint32_t cidx, unsigned long *ctr_info)
 		if (cidx == 0 || cidx == 2)
 			cinfo.width = 63;
 		else
-			cinfo.width = sbi_hart_mhpm_bits(scratch);
+			cinfo.width = sbi_hart_mhpm_bits(scratch) - 1;
 	} else {
 		/* it's a firmware counter */
 		cinfo.type = SBI_PMU_CTR_TYPE_FW;
-- 
2.31.1