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x86/pci/intel_mid_pci: Work around for IRQ0 assignment 

On Intel Tangier the MMC host controller is wired up to irq 0. But
several other devices have irq 0 associated as well due to a bogus PCI
configuration.

The first initialized driver will acquire irq 0 and make it
unavailable for other devices. If the sdhci driver is not the first
one it will fail to acquire the interrupt and therefor be non
functional.

Add a quirk to the pci irq enable function which denies irq 0 to
anything else than the MMC host controller driver on Tangier
platforms.

Fixes: 90b9aacf91 (serial: 8250_pci: add Intel Tangier support)
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Link: http://lkml.kernel.org/r/1438161409-4671-2-git-send-email-andriy.shevchenko@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Andy Shevchenko 2015-07-29 12:16:47 +03:00 committed by Thomas Gleixner
parent f33d159ea7
commit 39d9b77b8d
1 changed files with 22 additions and 2 deletions
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24
arch/x86/pci/intel_mid_pci.c
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@ -35,6 +35,9 @@
#define PCIE_CAP_OFFSET 0x100
/* Quirks for the listed devices */
#define PCI_DEVICE_ID_INTEL_MRFL_MMC 0x1190
/* Fixed BAR fields */
#define PCIE_VNDR_CAP_ID_FIXED_BAR 0x00 /* Fixed BAR (TBD) */
#define PCI_FIXED_BAR_0_SIZE 0x04
@ -214,10 +217,27 @@ static int intel_mid_pci_irq_enable(struct pci_dev *dev)
if (dev->irq_managed && dev->irq > 0)
return 0;
if (intel_mid_identify_cpu() == INTEL_MID_CPU_CHIP_TANGIER)
switch (intel_mid_identify_cpu()) {
case INTEL_MID_CPU_CHIP_TANGIER:
polarity = 0; /* active high */
else
/* Special treatment for IRQ0 */
if (dev->irq == 0) {
/*
* TNG has IRQ0 assigned to eMMC controller. But there
* are also other devices with bogus PCI configuration
* that have IRQ0 assigned. This check ensures that
* eMMC gets it.
*/
if (dev->device != PCI_DEVICE_ID_INTEL_MRFL_MMC)
return -EBUSY;
}
break;
default:
polarity = 1; /* active low */
break;
}
ioapic_set_alloc_attr(&info, dev_to_node(&dev->dev), 1, polarity);
/*