Re: [Intel-gfx] [PATCH 4/8] drm/i915/fbc: Polish the skl+ FBC stride override handling

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

On Fri, 02 Jul 2021, Ville Syrjala <ville.syrjala@linux.intel.com> wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
>
> Polish the FBC stride override stuff:
> - just call it override_cfb_stride since it'll be used on
>   more gens later
> - Use REG_BIT() & co. for the registers and give everything
>   CHICKEN_ prefix since glk+ will have a different register
>   for this
> - Use intel_de_rmw() for the RMW
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

Reviewed-by: Jani Nikula <jani.nikula@intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_fbc.c | 27 ++++++++++++------------
>  drivers/gpu/drm/i915/i915_drv.h          |  4 ++--
>  drivers/gpu/drm/i915/i915_reg.h          |  5 +++--
>  3 files changed, 19 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
> index c9cde96f330b..f5cbbc53837c 100644
> --- a/drivers/gpu/drm/i915/display/intel_fbc.c
> +++ b/drivers/gpu/drm/i915/display/intel_fbc.c
> @@ -306,14 +306,15 @@ static void gen7_fbc_activate(struct drm_i915_private *dev_priv)
>  
>  	/* Display WA #0529: skl, kbl, bxt. */
>  	if (DISPLAY_VER(dev_priv) == 9) {
> -		u32 val = intel_de_read(dev_priv, CHICKEN_MISC_4);
> +		u32 val = 0;
>  
> -		val &= ~(FBC_STRIDE_OVERRIDE | FBC_STRIDE_MASK);
> +		if (params->override_cfb_stride)
> +			val |= CHICKEN_FBC_STRIDE_OVERRIDE |
> +				CHICKEN_FBC_STRIDE(params->override_cfb_stride);
>  
> -		if (params->gen9_wa_cfb_stride)
> -			val |= FBC_STRIDE_OVERRIDE | params->gen9_wa_cfb_stride;
> -
> -		intel_de_write(dev_priv, CHICKEN_MISC_4, val);
> +		intel_de_rmw(dev_priv, CHICKEN_MISC_4,
> +			     CHICKEN_FBC_STRIDE_OVERRIDE |
> +			     CHICKEN_FBC_STRIDE_MASK, val);
>  	}
>  
>  	dpfc_ctl = 0;
> @@ -749,7 +750,7 @@ static bool intel_fbc_cfb_size_changed(struct drm_i915_private *dev_priv)
>  		fbc->compressed_fb.size * fbc->limit;
>  }
>  
> -static u16 intel_fbc_gen9_wa_cfb_stride(struct drm_i915_private *dev_priv)
> +static u16 intel_fbc_override_cfb_stride(struct drm_i915_private *dev_priv)
>  {
>  	struct intel_fbc *fbc = &dev_priv->fbc;
>  	struct intel_fbc_state_cache *cache = &fbc->state_cache;
> @@ -761,11 +762,11 @@ static u16 intel_fbc_gen9_wa_cfb_stride(struct drm_i915_private *dev_priv)
>  		return 0;
>  }
>  
> -static bool intel_fbc_gen9_wa_cfb_stride_changed(struct drm_i915_private *dev_priv)
> +static bool intel_fbc_override_cfb_stride_changed(struct drm_i915_private *dev_priv)
>  {
>  	struct intel_fbc *fbc = &dev_priv->fbc;
>  
> -	return fbc->params.gen9_wa_cfb_stride != intel_fbc_gen9_wa_cfb_stride(dev_priv);
> +	return fbc->params.override_cfb_stride != intel_fbc_override_cfb_stride(dev_priv);
>  }
>  
>  static bool intel_fbc_can_enable(struct drm_i915_private *dev_priv)
> @@ -950,7 +951,7 @@ static void intel_fbc_get_reg_params(struct intel_crtc *crtc,
>  
>  	params->cfb_size = intel_fbc_calculate_cfb_size(dev_priv, cache);
>  
> -	params->gen9_wa_cfb_stride = cache->gen9_wa_cfb_stride;
> +	params->override_cfb_stride = cache->override_cfb_stride;
>  
>  	params->plane_visible = cache->plane.visible;
>  }
> @@ -984,7 +985,7 @@ static bool intel_fbc_can_flip_nuke(const struct intel_crtc_state *crtc_state)
>  	if (params->cfb_size != intel_fbc_calculate_cfb_size(dev_priv, cache))
>  		return false;
>  
> -	if (params->gen9_wa_cfb_stride != cache->gen9_wa_cfb_stride)
> +	if (params->override_cfb_stride != cache->override_cfb_stride)
>  		return false;
>  
>  	return true;
> @@ -1266,7 +1267,7 @@ static void intel_fbc_enable(struct intel_atomic_state *state,
>  	if (fbc->crtc) {
>  		if (fbc->crtc != crtc ||
>  		    (!intel_fbc_cfb_size_changed(dev_priv) &&
> -		     !intel_fbc_gen9_wa_cfb_stride_changed(dev_priv)))
> +		     !intel_fbc_override_cfb_stride_changed(dev_priv)))
>  			goto out;
>  
>  		__intel_fbc_disable(dev_priv);
> @@ -1288,7 +1289,7 @@ static void intel_fbc_enable(struct intel_atomic_state *state,
>  		goto out;
>  	}
>  
> -	cache->gen9_wa_cfb_stride = intel_fbc_gen9_wa_cfb_stride(dev_priv);
> +	cache->override_cfb_stride = intel_fbc_override_cfb_stride(dev_priv);
>  
>  	drm_dbg_kms(&dev_priv->drm, "Enabling FBC on pipe %c\n",
>  		    pipe_name(crtc->pipe));
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 6dff4ca01241..91a2d2425fd3 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -401,7 +401,7 @@ struct intel_fbc {
>  		} fb;
>  
>  		unsigned int fence_y_offset;
> -		u16 gen9_wa_cfb_stride;
> +		u16 override_cfb_stride;
>  		u16 interval;
>  		s8 fence_id;
>  		bool psr2_active;
> @@ -428,7 +428,7 @@ struct intel_fbc {
>  
>  		int cfb_size;
>  		unsigned int fence_y_offset;
> -		u16 gen9_wa_cfb_stride;
> +		u16 override_cfb_stride;
>  		u16 interval;
>  		s8 fence_id;
>  		bool plane_visible;
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 16a19239d86d..ab2bd4837efd 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -8131,8 +8131,9 @@ enum {
>  #define  GLK_CL0_PWR_DOWN	(1 << 10)
>  
>  #define CHICKEN_MISC_4		_MMIO(0x4208c)
> -#define   FBC_STRIDE_OVERRIDE	(1 << 13)
> -#define   FBC_STRIDE_MASK	0x1FFF
> +#define   CHICKEN_FBC_STRIDE_OVERRIDE	REG_BIT(13)
> +#define   CHICKEN_FBC_STRIDE_MASK	REG_GENMASK(12, 0)
> +#define   CHICKEN_FBC_STRIDE(x)		REG_FIELD_PREP(CHICKEN_FBC_STRIDE_MASK, (x))
>  
>  #define _CHICKEN_PIPESL_1_A	0x420b0
>  #define _CHICKEN_PIPESL_1_B	0x420b4

-- 
Jani Nikula, Intel Open Source Graphics Center
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