[Intel-gfx] [PATCH v3 02/15] drm/i915/rkl: Program BW_BUDDY0 registers instead of BW_BUDDY1/2

[Aditya Swarup]

On Wed, Jun 03, 2020 at 02:15:16PM -0700, Matt Roper wrote:
> RKL uses the same BW_BUDDY programming table as TGL, but programs the
> values into a single set BUDDY0 set of registers rather than the
> BUDDY1/BUDDY2 sets used by TGL.
> 
> Bspec: 49218
> Cc: Aditya Swarup <aditya.swarup at intel.com>
> Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
> ---
>  .../drm/i915/display/intel_display_power.c    | 44 +++++++++++--------
>  drivers/gpu/drm/i915/i915_reg.h               | 14 ++++--
>  2 files changed, 35 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
> index 72312b67b57a..2c1ce50b572b 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_power.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_power.c
> @@ -5254,7 +5254,7 @@ static void tgl_bw_buddy_init(struct drm_i915_private *dev_priv)
>  	enum intel_dram_type type = dev_priv->dram_info.type;
>  	u8 num_channels = dev_priv->dram_info.num_channels;
>  	const struct buddy_page_mask *table;
> -	int i;
> +	int config, min_buddy, max_buddy, i;
>  
>  	if (IS_TGL_REVID(dev_priv, TGL_REVID_A0, TGL_REVID_B0))
>  		/* Wa_1409767108: tgl */
> @@ -5262,29 +5262,35 @@ static void tgl_bw_buddy_init(struct drm_i915_private *dev_priv)
>  	else
>  		table = tgl_buddy_page_masks;
>  
> -	for (i = 0; table[i].page_mask != 0; i++)
> -		if (table[i].num_channels == num_channels &&
> -		    table[i].type == type)
> +	if (IS_ROCKETLAKE(dev_priv)) {
> +		min_buddy = max_buddy = 0;
> +	} else {
> +		min_buddy = 1;
> +		max_buddy = 2;
> +	}
> +
> +	for (config = 0; table[config].page_mask != 0; config++)
> +		if (table[config].num_channels == num_channels &&
> +		    table[config].type == type)
>  			break;
>  
> -	if (table[i].page_mask == 0) {
> +	if (table[config].page_mask == 0) {
>  		drm_dbg(&dev_priv->drm,
>  			"Unknown memory configuration; disabling address buddy logic.\n");
> -		intel_de_write(dev_priv, BW_BUDDY1_CTL, BW_BUDDY_DISABLE);
> -		intel_de_write(dev_priv, BW_BUDDY2_CTL, BW_BUDDY_DISABLE);
> +		for (i = min_buddy; i <= max_buddy; i++)
> +			intel_de_write(dev_priv, BW_BUDDY_CTL(i),
> +				       BW_BUDDY_DISABLE);
>  	} else {
> -		intel_de_write(dev_priv, BW_BUDDY1_PAGE_MASK,
> -			       table[i].page_mask);
> -		intel_de_write(dev_priv, BW_BUDDY2_PAGE_MASK,
> -			       table[i].page_mask);
> -
> -		/* Wa_22010178259:tgl */
> -		intel_de_rmw(dev_priv, BW_BUDDY1_CTL,
> -			     BW_BUDDY_TLB_REQ_TIMER_MASK,
> -			     REG_FIELD_PREP(BW_BUDDY_TLB_REQ_TIMER_MASK, 0x8));
> -		intel_de_rmw(dev_priv, BW_BUDDY2_CTL,
> -			     BW_BUDDY_TLB_REQ_TIMER_MASK,
> -			     REG_FIELD_PREP(BW_BUDDY_TLB_REQ_TIMER_MASK, 0x8));
> +		for (i = min_buddy; i <= max_buddy; i++) {
> +			intel_de_write(dev_priv, BW_BUDDY_PAGE_MASK(i),
> +				       table[config].page_mask);
> +
> +			/* Wa_22010178259:tgl,rkl */
> +			intel_de_rmw(dev_priv, BW_BUDDY_CTL(i),
> +				     BW_BUDDY_TLB_REQ_TIMER_MASK,
> +				     REG_FIELD_PREP(BW_BUDDY_TLB_REQ_TIMER_MASK,
> +						    0x8));
We should be using REG_FIELD_PREP() in i915_reg.h to declare
TLB_REQ_TIMER value and then use the value here.
> +		}
>  	}
>  }
>  
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 578cfe11cbb9..3e79cefc510a 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -7837,13 +7837,19 @@ enum {
>  #define  WAIT_FOR_PCH_RESET_ACK		(1 << 1)
>  #define  WAIT_FOR_PCH_FLR_ACK		(1 << 0)
>  
> -#define BW_BUDDY1_CTL			_MMIO(0x45140)
> -#define BW_BUDDY2_CTL			_MMIO(0x45150)
> +#define _BW_BUDDY0_CTL			0x45130
> +#define _BW_BUDDY1_CTL			0x45140
> +#define BW_BUDDY_CTL(x)			_MMIO(_PICK_EVEN(x, \
> +							 _BW_BUDDY0_CTL, \
> +							 _BW_BUDDY1_CTL))
>  #define   BW_BUDDY_DISABLE		REG_BIT(31)
>  #define   BW_BUDDY_TLB_REQ_TIMER_MASK	REG_GENMASK(21, 16)
>  
> -#define BW_BUDDY1_PAGE_MASK		_MMIO(0x45144)
> -#define BW_BUDDY2_PAGE_MASK		_MMIO(0x45154)
> +#define _BW_BUDDY0_PAGE_MASK		0x45134
> +#define _BW_BUDDY1_PAGE_MASK		0x45144
> +#define BW_BUDDY_PAGE_MASK(x)		_MMIO(_PICK_EVEN(x, \
> +							 _BW_BUDDY0_PAGE_MASK, \
> +							 _BW_BUDDY1_PAGE_MASK))
>  
>  #define HSW_NDE_RSTWRN_OPT	_MMIO(0x46408)
>  #define  RESET_PCH_HANDSHAKE_ENABLE	(1 << 4)
> -- 
> 2.24.1
>