linux-kernel - [PATCH 3.13.y-ckt 56/96] sound/radeon: Move 64-bit MSI quirk from arch to driver

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Message-Id: <1418671616-25482-57-git-send-email-kamal@canonical.com>
Date:	Mon, 15 Dec 2014 11:26:16 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13.y-ckt 56/96] sound/radeon: Move 64-bit MSI quirk from arch to driver

3.13.11-ckt13 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Benjamin Herrenschmidt <benh@...nel.crashing.org>

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@...nel.crashing.org>
Reviewed-by: Takashi Iwai <tiwai@...e.de>
Reviewed-by: Alex Deucher <alexander.deucher@....com>
[ kamal: backport to 3.13-stable: AZX_DCAPS list in hda_intel.c ]
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 sound/pci/hda/hda_intel.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index c3f7839..e0f076c 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -607,6 +607,7 @@ enum {
 #define AZX_DCAPS_COUNT_LPIB_DELAY  (1 << 25)	/* Take LPIB as delay */
 #define AZX_DCAPS_PM_RUNTIME	(1 << 26)	/* runtime PM support */
 #define AZX_DCAPS_I915_POWERWELL (1 << 27)	/* HSW i915 power well support */
+#define AZX_DCAPS_NO_MSI64	(1 << 29)	/* Stick to 32-bit MSIs */
 
 /* quirks for Intel PCH */
 #define AZX_DCAPS_INTEL_PCH_NOPM \
@@ -628,7 +629,8 @@ 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 \
@@ -3681,9 +3683,14 @@ 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->no_64bit_msi = true;
+		}
 		if (pci_enable_msi(pci) < 0)
 			chip->msi = 0;
+	}
 
 	if (azx_acquire_irq(chip, 0) < 0)
 		return -EBUSY;
-- 
1.9.1

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