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Message-Id: <1344959772-23018-1-git-send-email-feng.tang@intel.com>
Date: Tue, 14 Aug 2012 23:56:12 +0800
From: Feng Tang <feng.tang@...el.com>
To: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Feng Tang <feng.tang@...el.com>,
Aaron Sierra <asierra@...-inc.com>,
Wim Van Sebroeck <wim@...ana.be>,
Len Brown <len.brown@...el.com>,
Bob Moore <robert.moore@...el.com>
Subject: [PATCH] lpc_ich: Fix a 3.5 kernel regression for iTCO_wdt driver
There are many reports (including 2 of my machines) that iTCO_wdt watchdog
driver fails to be initialized in 3.5 kernel with error message like:
[ 5.265175] ACPI Warning: 0x00001060-0x0000107f SystemIO conflicts with Region \_SB_.PCI0.LPCB.TCOI 1 (20120320/utaddress-251)
[ 5.265192] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver
[ 5.265206] lpc_ich: Resource conflict(s) found affecting iTCO_wdt
The root cause the iTCO_wdt driver in 3.4 probes the HW IO resource from
LPC's PCI config space, while in 3.5 kernel it relies on lpc_ich driver
for the probe, which adds a new acpi_check_resource_conflict() check, and
give up the probe if there is any conflict with ACPI.
Fix it by removing all the checks for iTCO_wdt to keep the same behavior as
3.4 kernel.
https://bugzilla.kernel.org/show_bug.cgi?id=44991
Actually the same check could be removed for the gpio-ich in lpc_ich.c,
but I'm not sure if it will cause problems.
Signed-off-by: Feng Tang <feng.tang@...el.com>
Cc: Aaron Sierra <asierra@...-inc.com>
Cc: Wim Van Sebroeck <wim@...ana.be>
Cc: Len Brown <len.brown@...el.com>
Cc: Bob Moore <robert.moore@...el.com>
---
drivers/mfd/lpc_ich.c | 20 +-------------------
1 files changed, 1 insertions(+), 19 deletions(-)
diff --git a/drivers/mfd/lpc_ich.c b/drivers/mfd/lpc_ich.c
index 027cc8f..a05fdfc 100644
--- a/drivers/mfd/lpc_ich.c
+++ b/drivers/mfd/lpc_ich.c
@@ -765,7 +765,6 @@ static int __devinit lpc_ich_init_wdt(struct pci_dev *dev,
u32 base_addr_cfg;
u32 base_addr;
int ret;
- bool acpi_conflict = false;
struct resource *res;
/* Setup power management base register */
@@ -780,20 +779,11 @@ static int __devinit lpc_ich_init_wdt(struct pci_dev *dev,
res = wdt_io_res(ICH_RES_IO_TCO);
res->start = base_addr + ACPIBASE_TCO_OFF;
res->end = base_addr + ACPIBASE_TCO_END;
- ret = acpi_check_resource_conflict(res);
- if (ret) {
- acpi_conflict = true;
- goto wdt_done;
- }
res = wdt_io_res(ICH_RES_IO_SMI);
res->start = base_addr + ACPIBASE_SMI_OFF;
res->end = base_addr + ACPIBASE_SMI_END;
- ret = acpi_check_resource_conflict(res);
- if (ret) {
- acpi_conflict = true;
- goto wdt_done;
- }
+
lpc_ich_enable_acpi_space(dev);
/*
@@ -813,11 +803,6 @@ static int __devinit lpc_ich_init_wdt(struct pci_dev *dev,
res = wdt_mem_res(ICH_RES_MEM_GCS);
res->start = base_addr + ACPIBASE_GCS_OFF;
res->end = base_addr + ACPIBASE_GCS_END;
- ret = acpi_check_resource_conflict(res);
- if (ret) {
- acpi_conflict = true;
- goto wdt_done;
- }
}
lpc_ich_finalize_cell(&lpc_ich_cells[LPC_WDT], id);
@@ -825,9 +810,6 @@ static int __devinit lpc_ich_init_wdt(struct pci_dev *dev,
1, NULL, 0);
wdt_done:
- if (acpi_conflict)
- pr_warn("Resource conflict(s) found affecting %s\n",
- lpc_ich_cells[LPC_WDT].name);
return ret;
}
--
1.7.1
--
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