[PATCH] drm/i915/dpkgc: Add VRR condition for DPKGC Enablement

[Golani, Mitulkumar Ajitkumar]

> -----Original Message-----
> From: Kandpal, Suraj <suraj.kandpal at intel.com>
> Sent: Thursday, July 11, 2024 10:19 AM
> To: intel-gfx at lists.freedesktop.org
> Cc: Manna, Animesh <animesh.manna at intel.com>; B, Jeevan
> <jeevan.b at intel.com>; Golani, Mitulkumar Ajitkumar
> <mitulkumar.ajitkumar.golani at intel.com>; Naladala, Ramanaidu
> <ramanaidu.naladala at intel.com>; Kandpal, Suraj <suraj.kandpal at intel.com>
> Subject: [PATCH] drm/i915/dpkgc: Add VRR condition for DPKGC Enablement
> 
> DPKGC can now be enabled with VRR enabled if Vmin = Vmax = Flipline is met.
> 
> Bspec: 68986
> Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>
> ---
>  drivers/gpu/drm/i915/display/skl_watermark.c | 24 +++++++++++---------
>  1 file changed, 13 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/skl_watermark.c
> b/drivers/gpu/drm/i915/display/skl_watermark.c
> index a2726364b34d..045c7cac166b 100644
> --- a/drivers/gpu/drm/i915/display/skl_watermark.c
> +++ b/drivers/gpu/drm/i915/display/skl_watermark.c
> @@ -2830,17 +2830,17 @@ static int skl_wm_add_affected_planes(struct
> intel_atomic_state *state,  }
> 
>  /*
> - * If Fixed Refresh Rate:
> + * If Fixed Refresh Rate or For VRR case Vmin = Vmax = Flipline:
>   * Program DEEP PKG_C_LATENCY Pkg C with highest valid latency from
>   * watermark level1 and up and above. If watermark level 1 is
>   * invalid program it with all 1's.
>   * Program PKG_C_LATENCY Added Wake Time = DSB execution time
> - * If Variable Refresh Rate:
> + * If Variable Refresh Rate where Vmin != Vmax != Flipline:
>   * Program DEEP PKG_C_LATENCY Pkg C with all 1's.
>   * Program PKG_C_LATENCY Added Wake Time = 0
>   */
>  static void
> -skl_program_dpkgc_latency(struct drm_i915_private *i915, bool vrr_enabled)
> +skl_program_dpkgc_latency(struct drm_i915_private *i915, bool
> +enable_dpkgc)
>  {
>  	u32 max_latency = 0;
>  	u32 clear = 0, val = 0;
> @@ -2849,15 +2849,15 @@ skl_program_dpkgc_latency(struct
> drm_i915_private *i915, bool vrr_enabled)
>  	if (DISPLAY_VER(i915) < 20)
>  		return;
> 
> -	if (vrr_enabled) {
> -		max_latency = LNL_PKG_C_LATENCY_MASK;
> -		added_wake_time = 0;
> -	} else {
> +	if (enable_dpkgc) {
>  		max_latency = skl_watermark_max_latency(i915, 1);
>  		if (max_latency == 0)
>  			max_latency = LNL_PKG_C_LATENCY_MASK;
>  		added_wake_time = DSB_EXE_TIME +
>  			i915->display.sagv.block_time_us;
> +	} else {
> +		max_latency = LNL_PKG_C_LATENCY_MASK;
> +		added_wake_time = 0;
>  	}
> 
>  	clear |= LNL_ADDED_WAKE_TIME_MASK |
> LNL_PKG_C_LATENCY_MASK; @@ -2873,7 +2873,7 @@
> skl_compute_wm(struct intel_atomic_state *state)
>  	struct intel_crtc *crtc;
>  	struct intel_crtc_state __maybe_unused *new_crtc_state;
>  	int ret, i;
> -	bool vrr_enabled = false;
> +	bool enable_dpkgc = false;
> 
>  	for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
>  		ret = skl_build_pipe_wm(state, crtc); @@ -2899,11 +2899,13
> @@ skl_compute_wm(struct intel_atomic_state *state)
>  		if (ret)
>  			return ret;
> 
> -		if (new_crtc_state->vrr.enable)
> -			vrr_enabled = true;
> +		if ((new_crtc_state->vrr.vmin == new_crtc_state->vrr.vmax &&
> +		     new_crtc_state->vrr.vmin == new_crtc_state->vrr.flipline) ||

	In current implementation this target to CMRR it seems.

> +		    !new_crtc_state->vrr.enable)
	But in CMRR as well, vrr.enable is set along with vrr.enable. Any specific case you are targeting to ?

> +			enable_dpkgc = true;
>  	}
> 
> -	skl_program_dpkgc_latency(to_i915(state->base.dev), vrr_enabled);
> +	skl_program_dpkgc_latency(to_i915(state->base.dev), enable_dpkgc);

> 
>  	skl_print_wm_changes(state);
> 
> --
> 2.43.2