[PATCH 6.15 072/592] media: ipu6: Remove workaround for Meteor Lake ES2

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

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

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

From: Hao Yao <hao.yao@intel.com>

commit d471fb06b21ae54bf76464731ae1dcb26ef1ca68 upstream.

There was a hardware bug which need IPU6 driver to disable the ATS. This
workaround is not needed anymore as the bug was fixed in hardware level.

Additionally, Arrow Lake has the same IPU6 PCI ID and x86 stepping but
does not have the bug. Removing the Meteor Lake workaround is also
required for the driver to function on Arrow Lake.

Signed-off-by: Hao Yao <hao.yao@intel.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Fixes: 25fedc021985 ("media: intel/ipu6: add Intel IPU6 PCI device driver")
Cc: stable@vger.kernel.org
[Sakari Ailus: Added tags and explanation of what is fixed.]
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/media/pci/intel/ipu6/ipu6.c |    5 -----
 1 file changed, 5 deletions(-)

--- a/drivers/media/pci/intel/ipu6/ipu6.c
+++ b/drivers/media/pci/intel/ipu6/ipu6.c
@@ -464,11 +464,6 @@ static int ipu6_pci_config_setup(struct
 {
 	int ret;
 
-	/* disable IPU6 PCI ATS on mtl ES2 */
-	if (is_ipu6ep_mtl(hw_ver) && boot_cpu_data.x86_stepping == 0x2 &&
-	    pci_ats_supported(dev))
-		pci_disable_ats(dev);
-
 	/* No PCI msi capability for IPU6EP */
 	if (is_ipu6ep(hw_ver) || is_ipu6ep_mtl(hw_ver)) {
 		/* likely do nothing as msi not enabled by default */