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drm/hypervdrm: Use vblank timer

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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
This commit is contained in:
Thomas Zimmermann
2025-09-16 10:36:22 +02:00
parent 02e2681ffe
commit 52e6b19883
1 changed files with 11 additions and 0 deletions
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11
drivers/gpu/drm/hyperv/hyperv_drm_modeset.c
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@@ -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;