diff options
| author | Thomas Zimmermann <tzimmermann@suse.de> | 2025-09-16 10:36:22 +0200 |
|---|---|---|
| committer | Thomas Zimmermann <tzimmermann@suse.de> | 2025-10-01 08:32:02 +0200 |
| commit | 52e6b198833411564e0b9ce6e96bbd3d72f961e7 (patch) | |
| tree | bbd53fc80741737eac22e3163472bf72ae63eaaa | |
| parent | 02e2681ffe1addde1fc8c35d05657b16bfa79613 (diff) | |
drm/hypervdrm: Use vblank timer
HyperV's virtual hardware does not provide vblank interrupts. Use a
vblank timer to simulate the interrupt. Rate-limits the display's
update frequency to the display-mode settings. Avoids excessive CPU
overhead with compositors that do not rate-limit their output.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Tested-by: Michael Kelley <mhklinux@outlook.com>
Tested-by: Prasanna Kumar T S M <ptsm@linux.microsoft.com>
Link: https://lore.kernel.org/r/20250916083816.30275-5-tzimmermann@suse.de
| -rw-r--r-- | drivers/gpu/drm/hyperv/hyperv_drm_modeset.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c b/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c index 945b9482bcb3..6e6eb1c12a68 100644 --- a/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c +++ b/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c @@ -19,6 +19,8 @@ #include <drm/drm_probe_helper.h> #include <drm/drm_panic.h> #include <drm/drm_plane.h> +#include <drm/drm_vblank.h> +#include <drm/drm_vblank_helper.h> #include "hyperv_drm.h" @@ -111,11 +113,15 @@ static void hyperv_crtc_helper_atomic_enable(struct drm_crtc *crtc, crtc_state->mode.hdisplay, crtc_state->mode.vdisplay, plane_state->fb->pitches[0]); + + drm_crtc_vblank_on(crtc); } static const struct drm_crtc_helper_funcs hyperv_crtc_helper_funcs = { .atomic_check = drm_crtc_helper_atomic_check, + .atomic_flush = drm_crtc_vblank_atomic_flush, .atomic_enable = hyperv_crtc_helper_atomic_enable, + .atomic_disable = drm_crtc_vblank_atomic_disable, }; static const struct drm_crtc_funcs hyperv_crtc_funcs = { @@ -125,6 +131,7 @@ static const struct drm_crtc_funcs hyperv_crtc_funcs = { .page_flip = drm_atomic_helper_page_flip, .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state, .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state, + DRM_CRTC_VBLANK_TIMER_FUNCS, }; static int hyperv_plane_atomic_check(struct drm_plane *plane, @@ -321,6 +328,10 @@ int hyperv_mode_config_init(struct hyperv_drm_device *hv) return ret; } + ret = drm_vblank_init(dev, 1); + if (ret) + return ret; + drm_mode_config_reset(dev); return 0; |