linux-kernel - [PATCH 1/6] riscv: errata: thead: only set cbom size & noncoherent during boot

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Message-Id: <20230526165958.908-2-jszhang@kernel.org>
Date:   Sat, 27 May 2023 00:59:53 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>
Subject: [PATCH 1/6] riscv: errata: thead: only set cbom size & noncoherent during boot

The CBOM size and whether the HW is noncoherent is known and
determined during booting and won't change after that.

Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
---
 arch/riscv/errata/thead/errata.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/errata/thead/errata.c b/arch/riscv/errata/thead/errata.c
index c259dc925ec1..be84b14f0118 100644
--- a/arch/riscv/errata/thead/errata.c
+++ b/arch/riscv/errata/thead/errata.c
@@ -45,8 +45,11 @@ static bool errata_probe_cmo(unsigned int stage,
 	if (stage == RISCV_ALTERNATIVES_EARLY_BOOT)
 		return false;
 
-	riscv_cbom_block_size = L1_CACHE_BYTES;
-	riscv_noncoherent_supported();
+	if (stage == RISCV_ALTERNATIVES_BOOT) {
+		riscv_cbom_block_size = L1_CACHE_BYTES;
+		riscv_noncoherent_supported();
+	}
+
 	return true;
 }
 
-- 
2.40.1