[Intel-gfx] [Intel-xe] [PATCH 16/42] drm/i915/xe2lpd: Move D2D enable/disable

[Matt Roper]

On Wed, Aug 23, 2023 at 10:07:14AM -0700, Lucas De Marchi wrote:
> Bits to enable/disable and check state for D2D moved from
> XELPDP_PORT_BUF_CTL1 to DDI_BUF_CTL. Make the functions

As of Xe2, DDI_BUF_CTL is now renamed to "DDI_CTL_DE" in the spec, so
you might want to toss a mention of the new register name in the commit
message here to make it easier to lookup in the spec.  E.g.,
"... (now named DDI_CTL_DE in the spec) ..."  Otherwise,

Reviewed-by: Matt Roper <matthew.d.roper at intel.com>

> mtl_ddi_disable_d2d() and mtl_ddi_enable_d2d generic to work with
> multiple reg location and bitfield layout.
> 
> Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_ddi.c | 38 +++++++++++++++++-------
>  drivers/gpu/drm/i915/i915_reg.h          |  2 ++
>  2 files changed, 30 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> index 61722556bb47..a9440c0ecf61 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -2356,13 +2356,22 @@ mtl_ddi_enable_d2d(struct intel_encoder *encoder)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
>  	enum port port = encoder->port;
> +	i915_reg_t reg;
> +	u32 set_bits, wait_bits;
>  
> -	intel_de_rmw(dev_priv, XELPDP_PORT_BUF_CTL1(port), 0,
> -		     XELPDP_PORT_BUF_D2D_LINK_ENABLE);
> +	if (DISPLAY_VER(dev_priv) >= 20) {
> +		reg = DDI_BUF_CTL(port);
> +		set_bits = XE2LPD_DDI_BUF_D2D_LINK_ENABLE;
> +		wait_bits = XE2LPD_DDI_BUF_D2D_LINK_STATE;
> +	} else {
> +		reg = XELPDP_PORT_BUF_CTL1(port);
> +		set_bits = XELPDP_PORT_BUF_D2D_LINK_ENABLE;
> +		wait_bits = XELPDP_PORT_BUF_D2D_LINK_STATE;
> +	}
>  
> -	if (wait_for_us((intel_de_read(dev_priv, XELPDP_PORT_BUF_CTL1(port)) &
> -			 XELPDP_PORT_BUF_D2D_LINK_STATE), 100)) {
> -		drm_err(&dev_priv->drm, "Timeout waiting for D2D Link enable for PORT_BUF_CTL %c\n",
> +	intel_de_rmw(dev_priv, reg, 0, set_bits);
> +	if (wait_for_us(intel_de_read(dev_priv, reg) & wait_bits, 100)) {
> +		drm_err(&dev_priv->drm, "Timeout waiting for D2D Link enable for DDI/PORT_BUF_CTL %c\n",
>  			port_name(port));
>  	}
>  }
> @@ -2809,13 +2818,22 @@ mtl_ddi_disable_d2d_link(struct intel_encoder *encoder)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
>  	enum port port = encoder->port;
> +	i915_reg_t reg;
> +	u32 clr_bits, wait_bits;
>  
> -	intel_de_rmw(dev_priv, XELPDP_PORT_BUF_CTL1(port),
> -		     XELPDP_PORT_BUF_D2D_LINK_ENABLE, 0);
> +	if (DISPLAY_VER(dev_priv) >= 20) {
> +		reg = DDI_BUF_CTL(port);
> +		clr_bits = XE2LPD_DDI_BUF_D2D_LINK_ENABLE;
> +		wait_bits = XE2LPD_DDI_BUF_D2D_LINK_STATE;
> +	} else {
> +		reg = XELPDP_PORT_BUF_CTL1(port);
> +		clr_bits = XELPDP_PORT_BUF_D2D_LINK_ENABLE;
> +		wait_bits = XELPDP_PORT_BUF_D2D_LINK_STATE;
> +	}
>  
> -	if (wait_for_us(!(intel_de_read(dev_priv, XELPDP_PORT_BUF_CTL1(port)) &
> -			  XELPDP_PORT_BUF_D2D_LINK_STATE), 100))
> -		drm_err(&dev_priv->drm, "Timeout waiting for D2D Link disable for PORT_BUF_CTL %c\n",
> +	intel_de_rmw(dev_priv, reg, clr_bits, 0);
> +	if (wait_for_us(!(intel_de_read(dev_priv, reg) & wait_bits), 100))
> +		drm_err(&dev_priv->drm, "Timeout waiting for D2D Link disable for DDI/PORT_BUF_CTL %c\n",
>  			port_name(port));
>  }
>  
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index dcf64e32cd54..84c5a76065a0 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -5723,6 +5723,8 @@ enum skl_power_gate {
>  /* Known as DDI_CTL_DE in MTL+ */
>  #define DDI_BUF_CTL(port) _MMIO_PORT(port, _DDI_BUF_CTL_A, _DDI_BUF_CTL_B)
>  #define  DDI_BUF_CTL_ENABLE			(1 << 31)
> +#define  XE2LPD_DDI_BUF_D2D_LINK_ENABLE		REG_BIT(29)
> +#define  XE2LPD_DDI_BUF_D2D_LINK_STATE		REG_BIT(28)
>  #define  DDI_BUF_TRANS_SELECT(n)	((n) << 24)
>  #define  DDI_BUF_EMP_MASK			(0xf << 24)
>  #define  DDI_BUF_PHY_LINK_RATE(r)		((r) << 20)
> -- 
> 2.40.1
> 

-- 
Matt Roper
Graphics Software Engineer
Linux GPU Platform Enablement
Intel Corporation