diff mbox series

[v4,18/18] drm/i915: Fix vblank evasion with vrr

Message ID 20210113220935.4151-19-manasi.d.navare@intel.com (mailing list archive)
State New, archived
Headers show
Series VRR/Adaptive Sync Enabling on DP/eDP for TGL+ | expand

Commit Message

Navare, Manasi Jan. 13, 2021, 10:09 p.m. UTC 
From: Ville Syrjälä <ville.syrjala@linux.intel.com>

With vrr enabled the hardware no longer latches the registers
automagically at vblank start. The point at which it will do the
latching even when no push has been sent is the vmax decision
boundary. That is the thing we need to evade to avoid our
register latching to get split between two frames.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
---
 drivers/gpu/drm/i915/display/intel_sprite.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Comments

Navare, Manasi Jan. 21, 2021, 11:06 p.m. UTC | #1 
On Wed, Jan 13, 2021 at 02:09:35PM -0800, Manasi Navare wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> With vrr enabled the hardware no longer latches the registers
> automagically at vblank start. The point at which it will do the
> latching even when no push has been sent is the vmax decision
> boundary. That is the thing we need to evade to avoid our
> register latching to get split between two frames.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>

Makes sense to us vmax vblank start here with vrr enable

Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>

Manasi

> ---
>  drivers/gpu/drm/i915/display/intel_sprite.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_sprite.c b/drivers/gpu/drm/i915/display/intel_sprite.c
> index 0e82d1629d2d..530ce0497559 100644
> --- a/drivers/gpu/drm/i915/display/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/display/intel_sprite.c
> @@ -101,7 +101,10 @@ void intel_pipe_update_start(const struct intel_crtc_state *new_crtc_state)
>  	if (new_crtc_state->uapi.async_flip)
>  		return;
>  
> -	vblank_start = intel_mode_vblank_start(adjusted_mode);
> +	if (new_crtc_state->vrr.enable)
> +		vblank_start = intel_vrr_vmax_vblank_start(new_crtc_state);
> +	else
> +		vblank_start = intel_mode_vblank_start(adjusted_mode);
>  
>  	/* FIXME needs to be calibrated sensibly */
>  	min = vblank_start - intel_usecs_to_scanlines(adjusted_mode,
> -- 
> 2.19.1
>
diff mbox series

Patch

diff --git a/drivers/gpu/drm/i915/display/intel_sprite.c b/drivers/gpu/drm/i915/display/intel_sprite.c
index 0e82d1629d2d..530ce0497559 100644
--- a/drivers/gpu/drm/i915/display/intel_sprite.c
+++ b/drivers/gpu/drm/i915/display/intel_sprite.c
@@ -101,7 +101,10 @@  void intel_pipe_update_start(const struct intel_crtc_state *new_crtc_state)
 	if (new_crtc_state->uapi.async_flip)
 		return;
 
-	vblank_start = intel_mode_vblank_start(adjusted_mode);
+	if (new_crtc_state->vrr.enable)
+		vblank_start = intel_vrr_vmax_vblank_start(new_crtc_state);
+	else
+		vblank_start = intel_mode_vblank_start(adjusted_mode);
 
 	/* FIXME needs to be calibrated sensibly */
 	min = vblank_start - intel_usecs_to_scanlines(adjusted_mode,