Merge tag 'trace-seq-buf-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/roste...

[cascardo/linux.git] / drivers / gpu / drm / radeon / radeon_irq_kms.c

diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c b/drivers/gpu/drm/radeon/radeon_irq_kms.c
index 7784911..00fc597 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
@@ -185,6 +185,16 @@ 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 = 1;
+       }
+
        /* force MSI on */
        if (radeon_msi == 1)
                return true;