On 7/21/23 14:19, Péter Ujfalusi wrote: > > > On 19/07/2023 19:41, Maarten Lankhorst wrote: >> Selecting CONFIG_DRM selects CONFIG_VIDEO_NOMODESET, which exports >> video_firmware_drivers_only(). This can be used as a first >> approximation on whether i915 will be available. It's safe to use as >> this is only built when CONFIG_SND_HDA_I915 is selected by CONFIG_I915. >> >> It's not completely fool proof, as you can boot with "nomodeset >> i915.modeset=1" to make i915 load regardless, or use >> "i915.force_probe=!*" to never load i915, but the common case of >> booting with nomodeset to disable all GPU drivers this will work as >> intended. >> >> Because of this, we add an extra module parameter, >> snd_hda_core.gpu_bind that can be used to signal users intent. >> -1 follows nomodeset, 0 disables binding, 1 forces wait/-EPROBE_DEFER >> on binding. > > Reviewed-by: Peter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx> > >> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx> >> --- >> sound/hda/hdac_i915.c | 10 ++++++++++ >> 1 file changed, 10 insertions(+) >> >> diff --git a/sound/hda/hdac_i915.c b/sound/hda/hdac_i915.c >> index 161a9711cd63e..c32709fa4115f 100644 >> --- a/sound/hda/hdac_i915.c >> +++ b/sound/hda/hdac_i915.c >> @@ -11,6 +11,13 @@ >> #include <sound/hda_i915.h> >> #include <sound/hda_register.h> >> >> +#include <video/nomodeset.h> >> + >> +static int gpu_bind = -1; >> +module_param(gpu_bind, int, 0644); >> +MODULE_PARM_DESC(gpu_bind, "Whether to bind sound component to GPU " >> + "(1=always, 0=never, -1=on nomodeset(default))"); >> + >> #define IS_HSW_CONTROLLER(pci) (((pci)->device == 0x0a0c) || \ >> ((pci)->device == 0x0c0c) || \ >> ((pci)->device == 0x0d0c) || \ >> @@ -121,6 +128,9 @@ static int i915_gfx_present(struct pci_dev *hdac_pci) >> { >> struct pci_dev *display_dev = NULL; >> >> + if (!gpu_bind || (gpu_bind < 0 && video_firmware_drivers_only())) >> + return false; Bear with me since I am just going back to work mode but I can't figure out what the second part of the test does bool video_firmware_drivers_only(void) { return video_nomodeset; } EXPORT_SYMBOL(video_firmware_drivers_only); and video_nomodeset=1 by default, so why would we return false when gpu_bind = -1? This seems to be a change of functionality, what am I missing? >> + >> for_each_pci_dev(display_dev) { >> if (display_dev->vendor == PCI_VENDOR_ID_INTEL && >> (display_dev->class >> 16) == PCI_BASE_CLASS_DISPLAY && >