From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org,
Mika Westerberg <mika.westerberg@linux.intel.com>,
Wolfram Sang <wsa@the-dreams.de>
Subject: [ 06/21] i2c: designware: always clear interrupts before enabling them
Date: Wed, 22 May 2013 15:10:24 -0700 [thread overview]
Message-ID: <20130522205233.408598986@linuxfoundation.org> (raw)
In-Reply-To: <20130522205232.597066680@linuxfoundation.org>
3.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mika Westerberg <mika.westerberg@linux.intel.com>
commit 2a2d95e9d6d29e726cc294b65391917ed2e32bf4 upstream.
If the I2C bus is put to a low power state by an ACPI method it might pull
the SDA line low (as its power is removed). Once the bus is put to full
power state again, the SDA line is pulled back to high. This transition
looks like a STOP condition from the controller point-of-view which sets
STOP detected bit in its status register causing the driver to fail
subsequent transfers.
Fix this by always clearing all interrupts before we start a transfer.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/i2c/busses/i2c-designware-core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/i2c/busses/i2c-designware-core.c
+++ b/drivers/i2c/busses/i2c-designware-core.c
@@ -361,7 +361,8 @@ static void i2c_dw_xfer_init(struct dw_i
/* Enable the adapter */
dw_writel(dev, 1, DW_IC_ENABLE);
- /* Enable interrupts */
+ /* Clear and enable interrupts */
+ i2c_dw_clear_int(dev);
dw_writel(dev, DW_IC_INTR_DEFAULT_MASK, DW_IC_INTR_MASK);
}
next prev parent reply other threads:[~2013-05-22 22:10 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-22 22:10 [ 00/21] 3.9.4-stable review Greg Kroah-Hartman
2013-05-22 22:10 ` [ 01/21] arm64: debug: clear mdscr_el1 instead of taking the OS lock Greg Kroah-Hartman
2013-05-22 22:10 ` [ 02/21] arm64: mm: Fix operands of clz in __flush_dcache_all Greg Kroah-Hartman
2013-05-22 22:10 ` [ 03/21] btrfs: dont stop searching after encountering the wrong item Greg Kroah-Hartman
2013-05-22 22:10 ` [ 04/21] hwmon: fix error return code in abituguru_probe() Greg Kroah-Hartman
2013-05-22 22:10 ` [ 05/21] i2c: designware: fix RX FIFO overrun Greg Kroah-Hartman
2013-05-22 22:10 ` Greg Kroah-Hartman [this message]
2013-05-22 22:10 ` [ 07/21] x86: Fix bit corruption at CPU resume time Greg Kroah-Hartman
2013-05-22 22:10 ` [ 08/21] drm/nouveau/bios: fix thinko in ZM_MASK_ADD opcode Greg Kroah-Hartman
2013-05-22 22:10 ` [ 09/21] drm/radeon: Fix VRAM size calculation for VRAM >= 4GB Greg Kroah-Hartman
2013-05-22 22:10 ` [ 10/21] virtio_console: fix uapi header Greg Kroah-Hartman
2013-05-22 22:10 ` [ 11/21] NTB: variable dereferenced before check Greg Kroah-Hartman
2013-05-22 22:10 ` [ 12/21] ntb: off by one sanity checks Greg Kroah-Hartman
2013-05-22 22:10 ` [ 13/21] NTB: fix pointer math issues Greg Kroah-Hartman
2013-05-22 22:10 ` [ 14/21] NTB: Handle 64bit BAR sizes Greg Kroah-Hartman
2013-05-22 22:10 ` [ 15/21] NTB: Link toggle memory leak Greg Kroah-Hartman
2013-05-22 22:10 ` [ 16/21] NTB: reset tx_index on link toggle Greg Kroah-Hartman
2013-05-22 22:10 ` [ 17/21] NTB: Correctly handle receive buffers of the minimal size Greg Kroah-Hartman
2013-05-22 22:10 ` [ 18/21] NTB: memcpy lockup workaround Greg Kroah-Hartman
2013-05-22 22:10 ` [ 19/21] ntb_netdev: remove from list on exit Greg Kroah-Hartman
2013-05-22 22:10 ` [ 20/21] NTB: Multiple NTB client fix Greg Kroah-Hartman
2013-05-22 22:10 ` [ 21/21] x86, vm86: fix VM86 syscalls: use SYSCALL_DEFINEx(...) Greg Kroah-Hartman
2013-05-24 11:13 ` Satoru Takeuchi
2013-05-23 16:52 ` [ 00/21] 3.9.4-stable review Shuah Khan
2013-05-23 16:57 ` Greg Kroah-Hartman
2013-05-24 11:46 ` Satoru Takeuchi
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