Subject: [PATCH 3/4] sound/hda/radeon: Generalize 64-bit MSI quirks

From: Benjamin Herrenschmidt <[email-masked]>
Date: Wed, 01 Oct 2014 12:09:43 +1000

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 HDA driver when
detecting the radeon audio interface.

Signed-off-by: Benjamin Herrenschmidt <[email-masked]>
CC: <[email-masked]>
---
 arch/powerpc/kernel/pci_64.c |  6 ------
 sound/pci/hda/hda_intel.c    | 10 ++++++++--
 sound/pci/hda/hda_priv.h     |  1 +
 3 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c
index 66e1cd0..b15194e 100644
--- a/arch/powerpc/kernel/pci_64.c
+++ b/arch/powerpc/kernel/pci_64.c
@@ -266,9 +266,3 @@ int pcibus_to_node(struct pci_bus *bus)
 }
 EXPORT_SYMBOL(pcibus_to_node);
 #endif
-
-static void quirk_radeon_32bit_msi(struct pci_dev *dev)
-{
-	dev->force_32bit_msi = true;
-}
-DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0xaa68, quirk_radeon_32bit_msi);
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index aa302fb..3e6d22d 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -296,7 +296,8 @@ enum {
 
 /* quirks for ATI/AMD HDMI */
 #define AZX_DCAPS_PRESET_ATI_HDMI \
-	(AZX_DCAPS_NO_TCSEL | AZX_DCAPS_SYNC_WRITE | AZX_DCAPS_POSFIX_LPIB)
+	(AZX_DCAPS_NO_TCSEL | AZX_DCAPS_SYNC_WRITE | AZX_DCAPS_POSFIX_LPIB|\
+	 AZX_DCAPS_NO_MSI64)
 
 /* quirks for Nvidia */
 #define AZX_DCAPS_PRESET_NVIDIA \
@@ -1505,9 +1506,14 @@ static int azx_first_init(struct azx *chip)
 		return -ENXIO;
 	}
 
-	if (chip->msi)
+	if (chip->msi) {
+		if (chip->driver_caps & AZX_DCAPS_NO_MSI64) {
+			dev_dbg(card->dev, "Disabling 64bit MSI\n");
+			pci->force_32bit_msi = true;
+		}
 		if (pci_enable_msi(pci) < 0)
 			chip->msi = 0;
+	}
 
 	if (azx_acquire_irq(chip, 0) < 0)
 		return -EBUSY;
diff --git a/sound/pci/hda/hda_priv.h b/sound/pci/hda/hda_priv.h
index 949cd43..5016014 100644
--- a/sound/pci/hda/hda_priv.h
+++ b/sound/pci/hda/hda_priv.h
@@ -171,6 +171,7 @@ enum { SDI0, SDI1, SDI2, SDI3, SDO0, SDO1, SDO2, SDO3 };
 #define AZX_DCAPS_PM_RUNTIME	(1 << 26)	/* runtime PM support */
 #define AZX_DCAPS_I915_POWERWELL (1 << 27)	/* HSW i915 powerwell support */
 #define AZX_DCAPS_CORBRP_SELF_CLEAR (1 << 28)	/* CORBRP clears itself after reset */
+#define AZX_DCAPS_NO_MSI64      (1 << 29)	/* Stick to 32-bit MSIs */
 
 /* HD Audio class code */
 #define PCI_CLASS_MULTIMEDIA_HD_AUDIO	0x0403