[PATCH] ACPI: RISC-V: CPPC: Add CSR_CYCLE for CPPC FFH

[Yunhui Cui]

Add the read of CSR_CYCLE to cppc_ffh_csr_read() to fix the
warning message: "CPPC Cpufreq: cppc_scale_freq_wokrfn: failed
to read perf counters".

Signed-off-by: Yunhui Cui <cuiyunhui at bytedance.com>
---
 drivers/acpi/riscv/cppc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/riscv/cppc.c b/drivers/acpi/riscv/cppc.c
index 4cdff387deff6..c1acaeb18eac3 100644
--- a/drivers/acpi/riscv/cppc.c
+++ b/drivers/acpi/riscv/cppc.c
@@ -69,11 +69,14 @@ static void cppc_ffh_csr_read(void *read_data)
 	struct sbi_cppc_data *data = (struct sbi_cppc_data *)read_data;
 
 	switch (data->reg) {
-	/* Support only TIME CSR for now */
 	case CSR_TIME:
 		data->ret.value = csr_read(CSR_TIME);
 		data->ret.error = 0;
 		break;
+	case CSR_CYCLE:
+		data->ret.value = csr_read(CSR_CYCLE);
+		data->ret.error = 0;
+		break;
 	default:
 		data->ret.error = -EINVAL;
 		break;
-- 
2.39.2