gmux new

Author: AdityaGarg8

patches/mux.patch

@@ -1,28 +1,30 @@
-From 52bafd0431f225b5d887222e93bc2398a56402a3 Mon Sep 17 00:00:00 2001
+From 954697c4622471d63fe037b9d1029cada4caa303 Mon Sep 17 00:00:00 2001
 From: Atharva Tiwari <atharvatiwarilinuxdev@gmail.com>
 Date: Mon, 16 Feb 2026 05:07:01 +0530
 Subject: [PATCH] apple-gmux: fix power for t2
 
 Signed-off-by: Atharva Tiwari <atharvatiwarilinuxdev@gmail.com>
 ---
- drivers/platform/x86/apple-gmux.c | 56 ++++++++++++++++++++++++++++---
- 1 file changed, 51 insertions(+), 5 deletions(-)
+ drivers/platform/x86/apple-gmux.c | 68 ++++++++++++++++++++++++++++---
+ 1 file changed, 63 insertions(+), 5 deletions(-)
 
 diff --git a/drivers/platform/x86/apple-gmux.c b/drivers/platform/x86/apple-gmux.c
-index e69785af8e1d..6cc99eb68caf 100644
+index e69785af8e1d..8769415a2a5d 100644
 --- a/drivers/platform/x86/apple-gmux.c
 +++ b/drivers/platform/x86/apple-gmux.c
-@@ -79,6 +79,9 @@ struct apple_gmux_data {
+@@ -79,6 +79,11 @@ struct apple_gmux_data {
  	/* debugfs data */
  	u8 selected_port;
  	struct dentry *debug_dentry;
 +
 +	struct pci_dev *dgpu_pdev;
++	u8 *dgpu_pci_config;
++
 +	enum apple_gmux_type type;
  };
 
  static struct apple_gmux_data *apple_gmux_data;
-@@ -517,13 +520,51 @@ static int gmux_set_discrete_state(struct apple_gmux_data *gmux_data,
+@@ -517,13 +522,61 @@ static int gmux_set_discrete_state(struct apple_gmux_data *gmux_data,
  {
  	reinit_completion(&gmux_data->powerchange_done);
 
@@ -45,6 +47,8 @@ index e69785af8e1d..6cc99eb68caf 100644
 +			msleep(1000);
 +
 +			pci_restore_state(gmux_data->dgpu_pdev);
++			for (u16 i = 0; i < 4096; i++)
++				pci_write_config_byte(gmux_data->dgpu_pdev, i, gmux_data->dgpu_pci_config[i]);
 +
 +			bar = pci_iomap(gmux_data->dgpu_pdev, 0, 0);
 +			if (WARN_ON(!bar))
@@ -65,6 +69,14 @@ index e69785af8e1d..6cc99eb68caf 100644
 +		if (gmux_data->type == APPLE_GMUX_TYPE_MMIO) {
 +			acpi_handle dgpu_handle = ACPI_HANDLE(&gmux_data->dgpu_pdev->dev);
 +
++			//TODO: make this better
++			gmux_data->dgpu_pci_config = kcalloc(4096, 1, GFP_KERNEL);
++			if (!gmux_data->dgpu_pci_config)
++				return -ENOMEM;
++
++			for (u16 i = 0; i < 4096; i++)
++				pci_read_config_byte(gmux_data->dgpu_pdev, i, &gmux_data->dgpu_pci_config[i]);
++
 +			pci_save_state(gmux_data->dgpu_pdev);
 +
 +			acpi_evaluate_object(dgpu_handle, "PWG1", NULL, NULL);
@@ -78,7 +90,7 @@ index e69785af8e1d..6cc99eb68caf 100644
  		pr_debug("Discrete card powered down\n");
  	}
 
-@@ -557,8 +598,12 @@ static enum vga_switcheroo_client_id gmux_get_client_id(struct pci_dev *pdev)
+@@ -557,8 +610,12 @@ static enum vga_switcheroo_client_id gmux_get_client_id(struct pci_dev *pdev)
  	else if (pdev->vendor == PCI_VENDOR_ID_NVIDIA &&
  		 pdev->device == 0x0863)
  		return VGA_SWITCHEROO_IGD;
@@ -92,7 +104,7 @@ index e69785af8e1d..6cc99eb68caf 100644
  }
 
  static const struct vga_switcheroo_handler gmux_handler_no_ddc = {
-@@ -809,6 +854,7 @@ static int gmux_probe(struct pnp_dev *pnp, const struct pnp_device_id *id)
+@@ -809,6 +866,7 @@ static int gmux_probe(struct pnp_dev *pnp, const struct pnp_device_id *id)
  		return -ENOMEM;
  	pnp_set_drvdata(pnp, gmux_data);