linux-kernel - [PATCH 3/8] MIPS: cpu-probe: Fix FPU detection on Ingenic JZ4760(B)

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Message-Id: <20210530171802.23649-4-paul@crapouillou.net>
Date:   Sun, 30 May 2021 18:17:57 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     Rob Herring <robh+dt@...nel.org>,
        周琰杰 <zhouyanjie@...yeetech.com>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, list@...ndingux.net,
        Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH 3/8] MIPS: cpu-probe: Fix FPU detection on Ingenic JZ4760(B)

Ingenic JZ4760 and JZ4760B do have a FPU, but the config registers don't
report it. Force the FPU detection in case the processor ID match the
JZ4760(B) one.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---
 arch/mips/kernel/cpu-probe.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 0ef240adefb5..630fcb4cb30e 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -1840,6 +1840,11 @@ static inline void cpu_probe_ingenic(struct cpuinfo_mips *c, unsigned int cpu)
 		 */
 		case PRID_COMP_INGENIC_D0:
 			c->isa_level &= ~MIPS_CPU_ISA_M32R2;
+
+			/* FPU is not properly detected on JZ4760(B). */
+			if (c->processor_id == 0x2ed0024f)
+				c->options |= MIPS_CPU_FPU;
+
 			fallthrough;
 
 		/*
-- 
2.30.2