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| author | Takahisa Tanaka <mc74hc00@gmail.com> | 2013-01-14 02:01:58 (GMT) |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2013-03-01 11:19:35 (GMT) |
| commit | 41adafbd7b84c66c2cdad857b75d5d45032310a6 (patch) | |
| tree | 8b38fb0f4b675d359f5e19b5622b89affa00128f | |
| parent | 10ab329b5db7e592a3a60b4594e4e5f40b60c45c (diff) | |
| download | linux-41adafbd7b84c66c2cdad857b75d5d45032310a6.tar.xz | |
watchdog: sp5100_tco: Write back the original value to reserved bits, instead of zero
In case of SP5100 or SB7x0 chipsets, the sp5100_tco module writes zero to
reserved bits. The module, however, shouldn't depend on specific default
value, and should perform a read-merge-write operation for the reserved
bits.
This patch makes the sp5100_tco module perform a read-merge-write operation
on all the chipset (sp5100, sb7x0, sb8x0 or later).
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=43176
Signed-off-by: Takahisa Tanaka <mc74hc00@gmail.com>
Tested-by: Paul Menzel <paulepanter@users.sourceforge.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Cc: stable <stable@vger.kernel.org>
| -rw-r--r-- | drivers/watchdog/sp5100_tco.c | 28 |
1 files changed, 8 insertions, 20 deletions
diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c index 5dfe86e..e3b8f75 100644 --- a/drivers/watchdog/sp5100_tco.c +++ b/drivers/watchdog/sp5100_tco.c @@ -361,7 +361,7 @@ static unsigned char sp5100_tco_setupdevice(void) { struct pci_dev *dev = NULL; const char *dev_name = NULL; - u32 val; + u32 val, tmp_val; u32 index_reg, data_reg, base_addr; /* Match the PCI device */ @@ -497,31 +497,19 @@ static unsigned char sp5100_tco_setupdevice(void) pr_debug("Got 0x%04x from resource tree\n", val); } - /* Restore to the low three bits, if chipset is SB8x0(or later) */ - if (sp5100_tco_pci->revision >= 0x40) { - u8 reserved_bit; - outb(base_addr+0, index_reg); - reserved_bit = inb(data_reg) & 0x7; - val |= (u32)reserved_bit; - } + /* Restore to the low three bits */ + outb(base_addr+0, index_reg); + tmp_val = val | (inb(data_reg) & 0x7); /* Re-programming the watchdog timer base address */ outb(base_addr+0, index_reg); - /* Low three bits of BASE are reserved */ - outb((val >> 0) & 0xff, data_reg); + outb((tmp_val >> 0) & 0xff, data_reg); outb(base_addr+1, index_reg); - outb((val >> 8) & 0xff, data_reg); + outb((tmp_val >> 8) & 0xff, data_reg); outb(base_addr+2, index_reg); - outb((val >> 16) & 0xff, data_reg); + outb((tmp_val >> 16) & 0xff, data_reg); outb(base_addr+3, index_reg); - outb((val >> 24) & 0xff, data_reg); - - /* - * Clear unnecessary the low three bits, - * if chipset is SB8x0(or later) - */ - if (sp5100_tco_pci->revision >= 0x40) - val &= ~0x7; + outb((tmp_val >> 24) & 0xff, data_reg); if (!request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE, dev_name)) { |