[PATCH 4.19 34/39] media: cx23885: add more quirks for reset DMA on some AMD IOMMU

[gregkh@linuxfoundation.org]

From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

From: Daniel Lee Kruse <daniel.lee.kruse@protonmail.com>

[ Upstream commit dbf0b3a7b719eb3f72cb53c2ce7d34a012a9c261 ]

On AMD Family 15h (Models 30h-3fh), I/O Memory Management Unit
RiSC engine sometimes stalls, requiring a reset.

As result, MythTV and w-scan won't scan channels on the AMD Kaveri
APU with the Hauppauge QuadHD TV tuner card.

For the solution I added the Input/Output Memory Management Unit's PCI
Identity of 0x1423 to the broken_dev_id[] array, which is used by
a quirks logic meant to fix similar problems with other AMD
chipsets.

Signed-off-by: Daniel Lee Kruse <daniel.lee.kruse@protonmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/media/pci/cx23885/cx23885-core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/media/pci/cx23885/cx23885-core.c b/drivers/media/pci/cx23885/cx23885-core.c
index fd5c52b21436..a1d738969d7b 100644
--- a/drivers/media/pci/cx23885/cx23885-core.c
+++ b/drivers/media/pci/cx23885/cx23885-core.c
@@ -2084,6 +2084,10 @@ static struct {
 	 * 0x1451 is PCI ID for the IOMMU found on Ryzen
 	 */
 	{ PCI_VENDOR_ID_AMD, 0x1451 },
+	/* According to sudo lspci -nn,
+	 * 0x1423 is the PCI ID for the IOMMU found on Kaveri
+	 */
+	{ PCI_VENDOR_ID_AMD, 0x1423 },
 };
 
 static bool cx23885_does_need_dma_reset(void)
-- 
2.30.1