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| author | Clemens Ladisch <clemens@ladisch.de> | 2010-04-01 16:40:18 +0200 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2010-04-10 16:51:14 +0200 |
| commit | e7014dada041982ae12ba7fd1967ca0ab0243e04 (patch) | |
| tree | b82e8047c6f00cfdfd9254a9cdcb66867a673e74 | |
| parent | firewire: ohci: add a function for reading PHY registers (diff) | |
| download | linux-e7014dada041982ae12ba7fd1967ca0ab0243e04.tar.xz linux-e7014dada041982ae12ba7fd1967ca0ab0243e04.zip | |
firewire: ohci: do not clear PHY interrupt status inadvertently
The interrupt status bits in PHY register 5 are cleared by writing a one
bit. To avoid clearing them unadvertently, do not write them back when
they were read as set, but only when they have been explicitly requested
to be set.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
| -rw-r--r-- | drivers/firewire/core.h | 1 | ||||
| -rw-r--r-- | drivers/firewire/ohci.c | 7 |
2 files changed, 8 insertions, 0 deletions
diff --git a/drivers/firewire/core.h b/drivers/firewire/core.h index fb0321300cce..b2a7b651473a 100644 --- a/drivers/firewire/core.h +++ b/drivers/firewire/core.h @@ -28,6 +28,7 @@ struct fw_packet; #define PHY_CONTENDER 0x40 #define PHY_BUS_RESET 0x40 #define PHY_BUS_SHORT_RESET 0x40 +#define PHY_INT_STATUS_BITS 0x3c #define BANDWIDTH_AVAILABLE_INITIAL 4915 #define BROADCAST_CHANNEL_INITIAL (1 << 31 | 31) diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c index 8ebccda94df9..525848f71c34 100644 --- a/drivers/firewire/ohci.c +++ b/drivers/firewire/ohci.c @@ -490,6 +490,13 @@ static int ohci_update_phy_reg(struct fw_card *card, int addr, if (err < 0) return err; + /* + * The interrupt status bits are cleared by writing a one bit. + * Avoid clearing them unless explicitly requested in set_bits. + */ + if (addr == 5) + clear_bits |= PHY_INT_STATUS_BITS; + old = (old & ~clear_bits) | set_bits; reg_write(ohci, OHCI1394_PhyControl, OHCI1394_PhyControl_Write(addr, old)); |