linux-kernel - [PATCH] irqchip/gic-v3-its: Fix probing for ITT_entry

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Message-ID: <1548933583-12504-1-git-send-email-yuzenghui@huawei.com>
Date:   Thu, 31 Jan 2019 11:19:43 +0000
From:   Zenghui Yu <yuzenghui@...wei.com>
To:     <marc.zyngier@....com>
CC:     <wanghaibin.wang@...wei.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, Zenghui Yu <yuzenghui@...wei.com>
Subject: [PATCH] irqchip/gic-v3-its: Fix probing for ITT_entry_size

According to ARM IHI 0069C (ID070116), we should use GITS_TYPER's
bits [7:4] as ITT_entry_size.

Signed-off-by: Zenghui Yu <yuzenghui@...wei.com>
---
 include/linux/irqchip/arm-gic-v3.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
index 071b4cb..c848a7c 100644
--- a/include/linux/irqchip/arm-gic-v3.h
+++ b/include/linux/irqchip/arm-gic-v3.h
@@ -319,7 +319,7 @@
 #define GITS_TYPER_PLPIS		(1UL << 0)
 #define GITS_TYPER_VLPIS		(1UL << 1)
 #define GITS_TYPER_ITT_ENTRY_SIZE_SHIFT	4
-#define GITS_TYPER_ITT_ENTRY_SIZE(r)	((((r) >> GITS_TYPER_ITT_ENTRY_SIZE_SHIFT) & 0x1f) + 1)
+#define GITS_TYPER_ITT_ENTRY_SIZE(r)	((((r) >> GITS_TYPER_ITT_ENTRY_SIZE_SHIFT) & 0xf) + 1)
 #define GITS_TYPER_IDBITS_SHIFT		8
 #define GITS_TYPER_DEVBITS_SHIFT	13
 #define GITS_TYPER_DEVBITS(r)		((((r) >> GITS_TYPER_DEVBITS_SHIFT) & 0x1f) + 1)
-- 
1.8.3.1