From: Thomas Zimmermann tzimmermann@suse.de
commit a273e95721e96885971a05f1b34cb6d093904d9d upstream.
Always allow switching away via vga-switcheroo if the display is uninitalized. Instead prevent switching to i915 if the device has not been initialized.
This issue was introduced by commit 5df7bd130818 ("drm/i915: skip display initialization when there is no display") protected, which protects code paths from being executed on uninitialized devices. In the case of vga-switcheroo, we want to allow a switch away from i915's device. So run vga_switcheroo_process_delayed_switch() and test in the switcheroo callbacks if the i915 device is available.
Fixes: 5df7bd130818 ("drm/i915: skip display initialization when there is no display") Signed-off-by: Thomas Zimmermann tzimmermann@suse.de Reviewed-by: Alex Deucher alexander.deucher@amd.com Cc: Radhakrishna Sripada radhakrishna.sripada@intel.com Cc: Lucas De Marchi lucas.demarchi@intel.com Cc: José Roberto de Souza jose.souza@intel.com Cc: Jani Nikula jani.nikula@intel.com Cc: Ville Syrjälä ville.syrjala@linux.intel.com Cc: Jani Nikula jani.nikula@linux.intel.com Cc: Joonas Lahtinen joonas.lahtinen@linux.intel.com Cc: Rodrigo Vivi rodrigo.vivi@intel.com Cc: Tvrtko Ursulin tvrtko.ursulin@linux.intel.com Cc: "Ville Syrjälä" ville.syrjala@linux.intel.com Cc: Manasi Navare manasi.d.navare@intel.com Cc: Stanislav Lisovskiy stanislav.lisovskiy@intel.com Cc: Imre Deak imre.deak@intel.com Cc: "Jouni Högander" jouni.hogander@intel.com Cc: Uma Shankar uma.shankar@intel.com Cc: Ankit Nautiyal ankit.k.nautiyal@intel.com Cc: "Jason A. Donenfeld" Jason@zx2c4.com Cc: Matt Roper matthew.d.roper@intel.com Cc: Ramalingam C ramalingam.c@intel.com Cc: Thomas Zimmermann tzimmermann@suse.de Cc: Andi Shyti andi.shyti@linux.intel.com Cc: Andrzej Hajda andrzej.hajda@intel.com Cc: "José Roberto de Souza" jose.souza@intel.com Cc: Julia Lawall Julia.Lawall@inria.fr Cc: intel-gfx@lists.freedesktop.org Cc: stable@vger.kernel.org # v5.14+ Link: https://patchwork.freedesktop.org/patch/msgid/20230116115425.13484-2-tzimmer... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/i915/i915_driver.c | 3 +-- drivers/gpu/drm/i915/i915_switcheroo.c | 6 +++++- 2 files changed, 6 insertions(+), 3 deletions(-)
--- a/drivers/gpu/drm/i915/i915_driver.c +++ b/drivers/gpu/drm/i915/i915_driver.c @@ -1074,8 +1074,7 @@ static void i915_driver_lastclose(struct
intel_fbdev_restore_mode(dev);
- if (HAS_DISPLAY(i915)) - vga_switcheroo_process_delayed_switch(); + vga_switcheroo_process_delayed_switch(); }
static void i915_driver_postclose(struct drm_device *dev, struct drm_file *file) --- a/drivers/gpu/drm/i915/i915_switcheroo.c +++ b/drivers/gpu/drm/i915/i915_switcheroo.c @@ -19,6 +19,10 @@ static void i915_switcheroo_set_state(st dev_err(&pdev->dev, "DRM not initialized, aborting switch.\n"); return; } + if (!HAS_DISPLAY(i915)) { + dev_err(&pdev->dev, "Device state not initialized, aborting switch.\n"); + return; + }
if (state == VGA_SWITCHEROO_ON) { drm_info(&i915->drm, "switched on\n"); @@ -44,7 +48,7 @@ static bool i915_switcheroo_can_switch(s * locking inversion with the driver load path. And the access here is * completely racy anyway. So don't bother with locking for now. */ - return i915 && atomic_read(&i915->drm.open_count) == 0; + return i915 && HAS_DISPLAY(i915) && atomic_read(&i915->drm.open_count) == 0; }
static const struct vga_switcheroo_client_ops i915_switcheroo_ops = {