gpu/radeon: Move 64-bit MSI quirk from arch to driver

A number of radeon cards have a HW limitation causing them to be unable to generate the full 64-bit of address bits for MSIs. This breaks MSIs on some platforms such as POWER machines.

We used to have a powerpc specific quirk to address that on a single card, but this doesn't scale very well, this is better put under control of the drivers who know precisely what a given HW revision can do.

This moves the setting of the quirk flag to the radeon driver

Signed-off-by Benjamin Herrenschmidt <[email protected]>

CC <[email protected]>

---

v2: This is just adjusted to the new flag name

 arch/powerpc/kernel/pci_64.c            |  1 -
 drivers/gpu/drm/radeon/radeon_irq_kms.c | 10 ++++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

arch/powerpc/kernel/pci_64.c +0 -1

index d41a831..5330f6d 100644
@@ -271,5 +271,4 @@ static void quirk_radeon_32bit_msi(struct pci_dev *dev)
 {
        dev->no_64bit_msi = true;
 }
-DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x68f2, quirk_radeon_32bit_msi);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0xaa68, quirk_radeon_32bit_msi);

drivers/gpu/drm/radeon/radeon_irq_kms.c +10 -0

index 16807af..e760671 100644
@@ -202,6 +202,16 @@ static bool radeon_msi_ok(struct radeon_device *rdev)
        if (rdev->flags & RADEON_IS_AGP)
                return false;
 
+       /*
+        * Older chips have a HW limitation, they can only generate 40 bits
+        * of address for "64-bit" MSIs which breaks on some platforms, notably
+        * IBM POWER servers, so we limit them
+        */
+       if (rdev->family < CHIP_BONAIRE) {
+               dev_info(rdev->dev, "radeon: MSI limited to 32-bit\n");
+               rdev->pdev->no_64bit_msi = true;
+       }
+
        /* force MSI on */
        if (radeon_msi == 1)
                return true;