From: Alexander Usyskin alexander.usyskin@intel.com

On Arrow Lake S systems, MEI is no longer strictly connected to bus 0, while graphics remain exclusively on bus 0. Adapt the component matching logic to accommodate this change:

Original behavior: Required both MEI and graphics to be on the same bus 0.

New behavior: Only enforces graphics to be on bus 0 (integrated), allowing MEI to reside on any bus. This ensures compatibility with Arrow Lake S and maintains functionality for the legacy systems.

Fixes: 1dd924f6885b ("mei: gsc_proxy: add gsc proxy driver") Cc: stable@vger.kernel.org # v6.3+ Signed-off-by: Alexander Usyskin alexander.usyskin@intel.com Signed-off-by: Tomas Winkler tomas.winkler@intel.com --- V2: Add reference to fixed commit Requires 'mei: me: add arrow lake point S DID' https://lore.kernel.org/lkml/20240211103912.117105-1-tomas.winkler@intel.com...

drivers/misc/mei/gsc_proxy/mei_gsc_proxy.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/misc/mei/gsc_proxy/mei_gsc_proxy.c b/drivers/misc/mei/gsc_proxy/mei_gsc_proxy.c index be52b113aea937c7c658e06c..89364bdbb1290f5726a34945 100644 --- a/drivers/misc/mei/gsc_proxy/mei_gsc_proxy.c +++ b/drivers/misc/mei/gsc_proxy/mei_gsc_proxy.c @@ -96,7 +96,8 @@ static const struct component_master_ops mei_component_master_ops = { * * The function checks if the device is pci device and * Intel VGA adapter, the subcomponent is SW Proxy - * and the parent of MEI PCI and the parent of VGA are the same PCH device. + * and the VGA is on the bus 0 reserved for built-in devices + * to reject discrete GFX. * * @dev: master device * @subcomponent: subcomponent to match (I915_COMPONENT_SWPROXY) @@ -123,7 +124,8 @@ static int mei_gsc_proxy_component_match(struct device *dev, int subcomponent, if (subcomponent != I915_COMPONENT_GSC_PROXY) return 0;

- return component_compare_dev(dev->parent, ((struct device *)data)->parent); + /* Only built-in GFX */ + return (pdev->bus->number == 0); }

static int mei_gsc_proxy_probe(struct mei_cl_device *cldev, @@ -146,7 +148,7 @@ static int mei_gsc_proxy_probe(struct mei_cl_device *cldev, }

component_match_add_typed(&cldev->dev, &master_match, - mei_gsc_proxy_component_match, cldev->dev.parent); + mei_gsc_proxy_component_match, NULL); if (IS_ERR_OR_NULL(master_match)) { ret = -ENOMEM; goto err_exit;