linux-kernel - [PATCH] ACPI: RISC-V: CPPC: Add CSR

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Message-Id: <20250515094301.40016-1-cuiyunhui@bytedance.com>
Date: Thu, 15 May 2025 17:43:01 +0800
From: Yunhui Cui <cuiyunhui@...edance.com>
To: sunilvl@...tanamicro.com,
	rafael@...nel.org,
	lenb@...nel.org,
	paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	alex@...ti.fr,
	linux-acpi@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: Yunhui Cui <cuiyunhui@...edance.com>
Subject: [PATCH] ACPI: RISC-V: CPPC: Add CSR_CYCLE for CPPC FFH

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@...edance.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