[PATCH] drm/i915/display: Use drm_crtc_vblank_count in intel_crtc_get_vblank_counter()
Jani Nikula
jani.nikula at linux.intel.com
Mon Aug 4 14:46:47 UTC 2025
On Thu, 24 Jul 2025, Maarten Lankhorst <dev at lankhorst.se> wrote:
> drm_crtc_accurate_vblank_count takes a spinlock, which we should avoid
> in tracepoints and debug functions.
>
> This also prevents taking the spinlock 2x during the critical
> section of pipe updates.
Don't we have vblank->max_vblank_count != 0 in most cases, and don't we
want accuracy in the rest of the cases?
The commit message should explain why it's okay to make this change.
BR,
Jani.
>
> Link: https://lore.kernel.org/r/20250715101636.906092-9-dev@lankhorst.se
> Signed-off-by: Maarten Lankhorst <dev at lankhorst.se>
> ---
> drivers/gpu/drm/i915/display/intel_crtc.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_crtc.c b/drivers/gpu/drm/i915/display/intel_crtc.c
> index dbdc4d9b2a33c..65a57cadfa3bf 100644
> --- a/drivers/gpu/drm/i915/display/intel_crtc.c
> +++ b/drivers/gpu/drm/i915/display/intel_crtc.c
> @@ -85,7 +85,7 @@ u32 intel_crtc_get_vblank_counter(struct intel_crtc *crtc)
> return 0;
>
> if (!vblank->max_vblank_count)
> - return (u32)drm_crtc_accurate_vblank_count(&crtc->base);
> + return (u32)drm_crtc_vblank_count(&crtc->base);
>
> return crtc->base.funcs->get_vblank_counter(&crtc->base);
> }
--
Jani Nikula, Intel
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