From: Abdul Halim, Mohd Syazwan Date: Wed, 22 Nov 2023 03:26:06 +0000 (+0800) Subject: iommu/vt-d: Add MTL to quirk list to skip TE disabling X-Git-Tag: v6.6.17~2348 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=38b3542305d05aa70bc2b5e2dfc3b66ea0349bbe;p=platform%2Fkernel%2Flinux-rpi.git iommu/vt-d: Add MTL to quirk list to skip TE disabling commit 85b80fdffa867d75dfb9084a839e7949e29064e8 upstream. The VT-d spec requires (10.4.4 Global Command Register, TE field) that: Hardware implementations supporting DMA draining must drain any in-flight DMA read/write requests queued within the Root-Complex before switching address translation on or off and reflecting the status of the command through the TES field in the Global Status register. Unfortunately, some integrated graphic devices fail to do so after some kind of power state transition. As the result, the system might stuck in iommu_disable_translation(), waiting for the completion of TE transition. Add MTL to the quirk list for those devices and skips TE disabling if the qurik hits. Fixes: b1012ca8dc4f ("iommu/vt-d: Skip TE disabling on quirky gfx dedicated iommu") Cc: stable@vger.kernel.org Signed-off-by: Abdul Halim, Mohd Syazwan Signed-off-by: Lu Baolu Link: https://lore.kernel.org/r/20231116022324.30120-1-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 3685ba9..8e878c3 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -4928,7 +4928,7 @@ static void quirk_igfx_skip_te_disable(struct pci_dev *dev) ver = (dev->device >> 8) & 0xff; if (ver != 0x45 && ver != 0x46 && ver != 0x4c && ver != 0x4e && ver != 0x8a && ver != 0x98 && - ver != 0x9a && ver != 0xa7) + ver != 0x9a && ver != 0xa7 && ver != 0x7d) return; if (risky_device(dev))