From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Ondrej Jirman <megous@megous.com>,
Sasha Levin <sashal@kernel.org>, Chen-Yu Tsai <wens@csie.org>,
Maxime Ripard <maxime@cerno.tech>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH AUTOSEL 4.9 1/5] bus: sunxi-rsb: Return correct data when mixing 16-bit and 8-bit reads
Date: Mon, 6 Apr 2020 20:03:00 -0400 [thread overview]
Message-ID: <20200407000304.17360-1-sashal@kernel.org> (raw)
From: Ondrej Jirman <megous@megous.com>
[ Upstream commit a43ab30dcd4a1abcdd0d2461bf1cf7c0817f6cd3 ]
When doing a 16-bit read that returns data in the MSB byte, the
RSB_DATA register will keep the MSB byte unchanged when doing
the following 8-bit read. sunxi_rsb_read() will then return
a result that contains high byte from 16-bit read mixed with
the 8-bit result.
The consequence is that after this happens the PMIC's regmap will
look like this: (0x33 is the high byte from the 16-bit read)
% cat /sys/kernel/debug/regmap/sunxi-rsb-3a3/registers
00: 33
01: 33
02: 33
03: 33
04: 33
05: 33
06: 33
07: 33
08: 33
09: 33
0a: 33
0b: 33
0c: 33
0d: 33
0e: 33
[snip]
Fix this by masking the result of the read with the correct mask
based on the size of the read. There are no 16-bit users in the
mainline kernel, so this doesn't need to get into the stable tree.
Signed-off-by: Ondrej Jirman <megous@megous.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/bus/sunxi-rsb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/bus/sunxi-rsb.c b/drivers/bus/sunxi-rsb.c
index 2051d926e3037..4f3d988210b0a 100644
--- a/drivers/bus/sunxi-rsb.c
+++ b/drivers/bus/sunxi-rsb.c
@@ -345,7 +345,7 @@ static int sunxi_rsb_read(struct sunxi_rsb *rsb, u8 rtaddr, u8 addr,
if (ret)
goto unlock;
- *buf = readl(rsb->regs + RSB_DATA);
+ *buf = readl(rsb->regs + RSB_DATA) & GENMASK(len * 8 - 1, 0);
unlock:
mutex_unlock(&rsb->lock);
--
2.20.1
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WARNING: multiple messages have this Message-ID (diff)
From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Ondrej Jirman <megous@megous.com>, Chen-Yu Tsai <wens@csie.org>,
Maxime Ripard <maxime@cerno.tech>,
Sasha Levin <sashal@kernel.org>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH AUTOSEL 4.9 1/5] bus: sunxi-rsb: Return correct data when mixing 16-bit and 8-bit reads
Date: Mon, 6 Apr 2020 20:03:00 -0400 [thread overview]
Message-ID: <20200407000304.17360-1-sashal@kernel.org> (raw)
From: Ondrej Jirman <megous@megous.com>
[ Upstream commit a43ab30dcd4a1abcdd0d2461bf1cf7c0817f6cd3 ]
When doing a 16-bit read that returns data in the MSB byte, the
RSB_DATA register will keep the MSB byte unchanged when doing
the following 8-bit read. sunxi_rsb_read() will then return
a result that contains high byte from 16-bit read mixed with
the 8-bit result.
The consequence is that after this happens the PMIC's regmap will
look like this: (0x33 is the high byte from the 16-bit read)
% cat /sys/kernel/debug/regmap/sunxi-rsb-3a3/registers
00: 33
01: 33
02: 33
03: 33
04: 33
05: 33
06: 33
07: 33
08: 33
09: 33
0a: 33
0b: 33
0c: 33
0d: 33
0e: 33
[snip]
Fix this by masking the result of the read with the correct mask
based on the size of the read. There are no 16-bit users in the
mainline kernel, so this doesn't need to get into the stable tree.
Signed-off-by: Ondrej Jirman <megous@megous.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/bus/sunxi-rsb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/bus/sunxi-rsb.c b/drivers/bus/sunxi-rsb.c
index 2051d926e3037..4f3d988210b0a 100644
--- a/drivers/bus/sunxi-rsb.c
+++ b/drivers/bus/sunxi-rsb.c
@@ -345,7 +345,7 @@ static int sunxi_rsb_read(struct sunxi_rsb *rsb, u8 rtaddr, u8 addr,
if (ret)
goto unlock;
- *buf = readl(rsb->regs + RSB_DATA);
+ *buf = readl(rsb->regs + RSB_DATA) & GENMASK(len * 8 - 1, 0);
unlock:
mutex_unlock(&rsb->lock);
--
2.20.1
next reply other threads:[~2020-04-07 0:05 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-07 0:03 Sasha Levin [this message]
2020-04-07 0:03 ` [PATCH AUTOSEL 4.9 1/5] bus: sunxi-rsb: Return correct data when mixing 16-bit and 8-bit reads Sasha Levin
2020-04-07 0:03 ` [PATCH AUTOSEL 4.9 2/5] net: vxge: fix wrong __VA_ARGS__ usage Sasha Levin
2020-04-07 0:03 ` [PATCH AUTOSEL 4.9 3/5] netfilter: nf_tables: Allow set back-ends to report partial overlaps on insertion Sasha Levin
2020-04-07 0:03 ` [PATCH AUTOSEL 4.9 4/5] qlcnic: Fix bad kzalloc null test Sasha Levin
2020-04-07 0:03 ` [PATCH AUTOSEL 4.9 5/5] i2c: st: fix missing struct parameter description Sasha Levin
2020-04-07 0:03 ` Sasha Levin
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