linux-kernel - [PATCH 1/6] MIPS/malta: simplify plat_setup

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Message-Id: <20210208145024.3320420-2-hch@lst.de>
Date:   Mon,  8 Feb 2021 15:50:19 +0100
From:   Christoph Hellwig <hch@....de>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        iommu@...ts.linux-foundation.org
Subject: [PATCH 1/6] MIPS/malta: simplify plat_setup_iocoherency

Merge plat_enable_iocoherency into plat_setup_iocoherency to simplify
the code a bit.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 arch/mips/mti-malta/malta-setup.c | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/arch/mips/mti-malta/malta-setup.c b/arch/mips/mti-malta/malta-setup.c
index e1fb8b5349447e..f3fec5a5a07c76 100644
--- a/arch/mips/mti-malta/malta-setup.c
+++ b/arch/mips/mti-malta/malta-setup.c
@@ -90,7 +90,7 @@ static void __init fd_activate(void)
 }
 #endif
 
-static int __init plat_enable_iocoherency(void)
+static void __init plat_setup_iocoherency(void)
 {
 	int supported = 0;
 	u32 cfg;
@@ -118,19 +118,13 @@ static int __init plat_enable_iocoherency(void)
 		/* Nothing special needs to be done to enable coherency */
 		pr_info("CMP IOCU detected\n");
 		cfg = __raw_readl((u32 *)CKSEG1ADDR(ROCIT_CONFIG_GEN0));
-		if (!(cfg & ROCIT_CONFIG_GEN0_PCI_IOCU)) {
+		if (cfg & ROCIT_CONFIG_GEN0_PCI_IOCU)
+			supported = 1;
+		else
 			pr_crit("IOCU OPERATION DISABLED BY SWITCH - DEFAULTING TO SW IO COHERENCY\n");
-			return 0;
-		}
-		supported = 1;
 	}
-	hw_coherentio = supported;
-	return supported;
-}
 
-static void __init plat_setup_iocoherency(void)
-{
-	if (plat_enable_iocoherency()) {
+	if (supported)
 		if (coherentio == IO_COHERENCE_DISABLED)
 			pr_info("Hardware DMA cache coherency disabled\n");
 		else
@@ -141,6 +135,7 @@ static void __init plat_setup_iocoherency(void)
 		else
 			pr_info("Software DMA cache coherency enabled\n");
 	}
+	hw_coherentio = supported;
 }
 
 static void __init pci_clock_check(void)
-- 
2.29.2