Re: [PATCH 1/2] drm/i915/display: Add own counter for Panel Replay vblank workaround

[Jani Nikula <jani.nikula@linux.intel.com>]

On Mon, 30 Sep 2024, Jouni Högander <jouni.hogander@intel.com> wrote:
> We are about to change meaning of vblank_enabled to fix Panel Replay vblank
> workaround. For sake of clarity we need to rename it. Vblank_enabled is
> used for i915gm/i945gm vblank irq workaround as well -> instead of rename
> add new counter named as vblank_wa_pipes.
>
> Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_display_core.h | 2 ++
>  drivers/gpu/drm/i915/display/intel_display_irq.c  | 8 ++++----
>  2 files changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display_core.h b/drivers/gpu/drm/i915/display/intel_display_core.h
> index 982dd94691954..aff06bbf62c90 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_core.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_core.h
> @@ -455,6 +455,8 @@ struct intel_display {
>  		/* For i915gm/i945gm vblank irq workaround */
>  		u8 vblank_enabled;
>  
> +		u8 vblank_wa_pipes;
> +

Could make that an int and name _num_pipes or something while at it. I
first thought it was a bitmask.

>  		struct work_struct vblank_dc_work;
>  
>  		u32 de_irq_mask[I915_MAX_PIPES];
> diff --git a/drivers/gpu/drm/i915/display/intel_display_irq.c b/drivers/gpu/drm/i915/display/intel_display_irq.c
> index 6878dde85031c..d71f4b0ee7357 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_irq.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_irq.c
> @@ -1365,7 +1365,7 @@ static void intel_display_vblank_dc_work(struct work_struct *work)
>  	struct intel_display *display =
>  		container_of(work, typeof(*display), irq.vblank_dc_work);
>  	struct drm_i915_private *i915 = to_i915(display->drm);
> -	u8 vblank_enabled = READ_ONCE(display->irq.vblank_enabled);
> +	u8 vblank_wa_pipes = READ_ONCE(display->irq.vblank_wa_pipes);
>  
>  	/*
>  	 * NOTE: intel_display_power_set_target_dc_state is used only by PSR
> @@ -1373,7 +1373,7 @@ static void intel_display_vblank_dc_work(struct work_struct *work)
>  	 * PSR code. If DC3CO is taken into use we need take that into account
>  	 * here as well.
>  	 */
> -	intel_display_power_set_target_dc_state(i915, vblank_enabled ? DC_STATE_DISABLE :
> +	intel_display_power_set_target_dc_state(i915, vblank_wa_pipes ? DC_STATE_DISABLE :
>  						DC_STATE_EN_UPTO_DC6);
>  }
>  
> @@ -1388,7 +1388,7 @@ int bdw_enable_vblank(struct drm_crtc *_crtc)
>  	if (gen11_dsi_configure_te(crtc, true))
>  		return 0;
>  
> -	if (display->irq.vblank_enabled++ == 0 && crtc->block_dc_for_vblank)
> +	if (display->irq.vblank_wa_pipes++ == 0 && crtc->block_dc_for_vblank)
>  		schedule_work(&display->irq.vblank_dc_work);
>  
>  	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
> @@ -1468,7 +1468,7 @@ void bdw_disable_vblank(struct drm_crtc *_crtc)
>  	bdw_disable_pipe_irq(dev_priv, pipe, GEN8_PIPE_VBLANK);
>  	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
>  
> -	if (--display->irq.vblank_enabled == 0 && crtc->block_dc_for_vblank)
> +	if (--display->irq.vblank_wa_pipes == 0 && crtc->block_dc_for_vblank)
>  		schedule_work(&display->irq.vblank_dc_work);
>  }

-- 
Jani Nikula, Intel