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path: root/drivers/gpu/vga
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Diffstat (limited to 'drivers/gpu/vga')
-rw-r--r--drivers/gpu/vga/vga_switcheroo.c62
1 files changed, 46 insertions, 16 deletions
diff --git a/drivers/gpu/vga/vga_switcheroo.c b/drivers/gpu/vga/vga_switcheroo.c
index cbd7c986d..5f962bfcb 100644
--- a/drivers/gpu/vga/vga_switcheroo.c
+++ b/drivers/gpu/vga/vga_switcheroo.c
@@ -30,6 +30,7 @@
#define pr_fmt(fmt) "vga_switcheroo: " fmt
+#include <linux/apple-gmux.h>
#include <linux/console.h>
#include <linux/debugfs.h>
#include <linux/fb.h>
@@ -51,9 +52,9 @@
*
* * muxed: Dual GPUs with a multiplexer chip to switch outputs between GPUs.
* * muxless: Dual GPUs but only one of them is connected to outputs.
- * The other one is merely used to offload rendering, its results
- * are copied over PCIe into the framebuffer. On Linux this is
- * supported with DRI PRIME.
+ * The other one is merely used to offload rendering, its results
+ * are copied over PCIe into the framebuffer. On Linux this is
+ * supported with DRI PRIME.
*
* Hybrid graphics started to appear in the late Naughties and were initially
* all muxed. Newer laptops moved to a muxless architecture for cost reasons.
@@ -308,7 +309,8 @@ static int register_client(struct pci_dev *pdev,
*
* Register vga client (GPU). Enable vga_switcheroo if another GPU and a
* handler have already registered. The power state of the client is assumed
- * to be ON.
+ * to be ON. Beforehand, vga_switcheroo_client_probe_defer() shall be called
+ * to ensure that all prerequisites are met.
*
* Return: 0 on success, -ENOMEM on memory allocation error.
*/
@@ -329,7 +331,8 @@ EXPORT_SYMBOL(vga_switcheroo_register_client);
* @id: client identifier
*
* Register audio client (audio device on a GPU). The power state of the
- * client is assumed to be ON.
+ * client is assumed to be ON. Beforehand, vga_switcheroo_client_probe_defer()
+ * shall be called to ensure that all prerequisites are met.
*
* Return: 0 on success, -ENOMEM on memory allocation error.
*/
@@ -376,6 +379,33 @@ find_active_client(struct list_head *head)
}
/**
+ * vga_switcheroo_client_probe_defer() - whether to defer probing a given client
+ * @pdev: client pci device
+ *
+ * Determine whether any prerequisites are not fulfilled to probe a given
+ * client. Drivers shall invoke this early on in their ->probe callback
+ * and return %-EPROBE_DEFER if it evaluates to %true. Thou shalt not
+ * register the client ere thou hast called this.
+ *
+ * Return: %true if probing should be deferred, otherwise %false.
+ */
+bool vga_switcheroo_client_probe_defer(struct pci_dev *pdev)
+{
+ if ((pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
+ /*
+ * apple-gmux is needed on pre-retina MacBook Pro
+ * to probe the panel if pdev is the inactive GPU.
+ */
+ if (apple_gmux_present() && pdev != vga_default_device() &&
+ !vgasr_priv.handler_flags)
+ return true;
+ }
+
+ return false;
+}
+EXPORT_SYMBOL(vga_switcheroo_client_probe_defer);
+
+/**
* vga_switcheroo_get_client_state() - obtain power state of a given client
* @pdev: client pci device
*
@@ -530,21 +560,21 @@ EXPORT_SYMBOL(vga_switcheroo_unlock_ddc);
* * OFF: Power off the device not in use.
* * ON: Power on the device not in use.
* * IGD: Switch to the integrated graphics device.
- * Power on the integrated GPU if necessary, power off the discrete GPU.
- * Prerequisite is that no user space processes (e.g. Xorg, alsactl)
- * have opened device files of the GPUs or the audio client. If the
- * switch fails, the user may invoke lsof(8) or fuser(1) on /dev/dri/
- * and /dev/snd/controlC1 to identify processes blocking the switch.
+ * Power on the integrated GPU if necessary, power off the discrete GPU.
+ * Prerequisite is that no user space processes (e.g. Xorg, alsactl)
+ * have opened device files of the GPUs or the audio client. If the
+ * switch fails, the user may invoke lsof(8) or fuser(1) on /dev/dri/
+ * and /dev/snd/controlC1 to identify processes blocking the switch.
* * DIS: Switch to the discrete graphics device.
* * DIGD: Delayed switch to the integrated graphics device.
- * This will perform the switch once the last user space process has
- * closed the device files of the GPUs and the audio client.
+ * This will perform the switch once the last user space process has
+ * closed the device files of the GPUs and the audio client.
* * DDIS: Delayed switch to the discrete graphics device.
* * MIGD: Mux-only switch to the integrated graphics device.
- * Does not remap console or change the power state of either gpu.
- * If the integrated GPU is currently off, the screen will turn black.
- * If it is on, the screen will show whatever happens to be in VRAM.
- * Either way, the user has to blindly enter the command to switch back.
+ * Does not remap console or change the power state of either gpu.
+ * If the integrated GPU is currently off, the screen will turn black.
+ * If it is on, the screen will show whatever happens to be in VRAM.
+ * Either way, the user has to blindly enter the command to switch back.
* * MDIS: Mux-only switch to the discrete graphics device.
*
* For GPUs whose power state is controlled by the driver's runtime pm,