Patch "sound/radeon: Move 64-bit MSI quirk from arch to driver" has been added to the 3.17-stable tree

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This is a note to let you know that I've just added the patch titled

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

to the 3.17-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     sound-radeon-move-64-bit-msi-quirk-from-arch-to-driver.patch
and it can be found in the queue-3.17 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From db79afa1e57925ba96ab18514c0ebe42a28e393e Mon Sep 17 00:00:00 2001
From: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Date: Mon, 24 Nov 2014 14:17:08 +1100
Subject: sound/radeon: Move 64-bit MSI quirk from arch to driver

From: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>

commit db79afa1e57925ba96ab18514c0ebe42a28e393e upstream.

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.

We now have a generic quirk in the PCI code. We should set it
appropriately for all radeon's from the audio driver.

Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Takashi Iwai <tiwai@xxxxxxx>
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 sound/pci/hda/hda_intel.c |   10 ++++++++--
 sound/pci/hda/hda_priv.h  |    1 +
 2 files changed, 9 insertions(+), 2 deletions(-)

--- 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 \
@@ -1508,9 +1509,14 @@ static int azx_first_init(struct azx *ch
 		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->no_64bit_msi = true;
+		}
 		if (pci_enable_msi(pci) < 0)
 			chip->msi = 0;
+	}
 
 	if (azx_acquire_irq(chip, 0) < 0)
 		return -EBUSY;
--- a/sound/pci/hda/hda_priv.h
+++ b/sound/pci/hda/hda_priv.h
@@ -171,6 +171,7 @@ enum { SDI0, SDI1, SDI2, SDI3, SDO0, SDO
 #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


Patches currently in stable-queue which might be from benh@xxxxxxxxxxxxxxxxxxx are

queue-3.17/sound-radeon-move-64-bit-msi-quirk-from-arch-to-driver.patch
queue-3.17/of-base-fix-powerpc-address-parsing-hack.patch
queue-3.17/powerpc-pseries-honor-the-generic-no_64bit_msi-flag.patch
queue-3.17/pci-msi-add-device-flag-indicating-that-64-bit-msis-don-t-work.patch
queue-3.17/alsa-hda-limit-40bit-dma-for-amd-hdmi-controllers.patch
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