Re: [Intel-gfx] [PATCH 09/22] drm/i915/adl_s: Configure Port clock registers for ADL-S

[Matt Roper <matthew.d.roper@intel.com>]

On Fri, Dec 04, 2020 at 05:08:31PM -0800, Aditya Swarup wrote:
> Add changes to configure port clock registers for ADL-S. Combo phy port
> clocks are configured by DPCLKA_CFGCR0 and DPCLKA_CFGCR1 registers.
> 
> The DDI to internal clock mappings in DPCLKA_CFGCR0 register for ADL-S
> translates to
> DDI A -> DDIA
> DDI B -> USBC1
> DDI I -> USBC2
> 
> For DPCLKA_CFGCR1
> DDI J -> USBC3
> DDI K -> USBC4
> 
> Bspec: 50287
> Bspec: 53812
> Bspec: 53723
> 
> v2: Replace I915_READ() with intel_de_read().(Jani)
> 
> Cc: Jani Nikula <jani.nikula@intel.com>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Cc: Imre Deak <imre.deak@intel.com>
> Cc: Matt Roper <matthew.d.roper@intel.com>
> Cc: Lucas De Marchi <lucas.demarchi@intel.com>
> Signed-off-by: Aditya Swarup <aditya.swarup@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_ddi.c     | 64 +++++++++++++-------
>  drivers/gpu/drm/i915/display/intel_display.c | 18 +++++-
>  drivers/gpu/drm/i915/i915_reg.h              | 23 ++++++-
>  3 files changed, 82 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> index 76e975b4765b..fdf692be2bc3 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -3088,25 +3088,30 @@ static void icl_map_plls_to_ports(struct intel_encoder *encoder,
>  	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
>  	struct intel_shared_dpll *pll = crtc_state->shared_dpll;
>  	enum phy phy = intel_port_to_phy(dev_priv, encoder->port);
> -	u32 val;
> +	u32 val, mask, sel;
> +	i915_reg_t reg;
> +
> +	if (IS_ALDERLAKE_S(dev_priv)) {
> +		reg = ADLS_DPCLKA_CFGCR(phy);
> +		mask = ADLS_DPCLKA_CFGCR_DDI_CLK_SEL_MASK(phy);
> +		sel = ((pll->info->id) << ADLS_DPCLKA_CFGCR_DDI_SHIFT(phy));
> +	} else if (IS_ROCKETLAKE(dev_priv)) {
> +		reg = ICL_DPCLKA_CFGCR0;
> +		mask = RKL_DPCLKA_CFGCR0_DDI_CLK_SEL_MASK(phy);
> +		sel = RKL_DPCLKA_CFGCR0_DDI_CLK_SEL(pll->info->id, phy);
> +	} else {
> +		reg = ICL_DPCLKA_CFGCR0;
> +		mask = ICL_DPCLKA_CFGCR0_DDI_CLK_SEL_MASK(phy);
> +		sel = ICL_DPCLKA_CFGCR0_DDI_CLK_SEL(pll->info->id, phy);
> +	}
>  
>  	mutex_lock(&dev_priv->dpll.lock);
>  
> -	val = intel_de_read(dev_priv, ICL_DPCLKA_CFGCR0);
> +	val = intel_de_read(dev_priv, reg);
>  	drm_WARN_ON(&dev_priv->drm,
>  		    (val & icl_dpclka_cfgcr0_clk_off(dev_priv, phy)) == 0);
>  
>  	if (intel_phy_is_combo(dev_priv, phy)) {
> -		u32 mask, sel;
> -
> -		if (IS_ROCKETLAKE(dev_priv)) {
> -			mask = RKL_DPCLKA_CFGCR0_DDI_CLK_SEL_MASK(phy);
> -			sel = RKL_DPCLKA_CFGCR0_DDI_CLK_SEL(pll->info->id, phy);
> -		} else {
> -			mask = ICL_DPCLKA_CFGCR0_DDI_CLK_SEL_MASK(phy);
> -			sel = ICL_DPCLKA_CFGCR0_DDI_CLK_SEL(pll->info->id, phy);
> -		}
> -
>  		/*
>  		 * Even though this register references DDIs, note that we
>  		 * want to pass the PHY rather than the port (DDI).  For
> @@ -3119,12 +3124,12 @@ static void icl_map_plls_to_ports(struct intel_encoder *encoder,
>  		 */
>  		val &= ~mask;
>  		val |= sel;
> -		intel_de_write(dev_priv, ICL_DPCLKA_CFGCR0, val);
> -		intel_de_posting_read(dev_priv, ICL_DPCLKA_CFGCR0);
> +		intel_de_write(dev_priv, reg, val);
> +		intel_de_posting_read(dev_priv, reg);
>  	}
>  
>  	val &= ~icl_dpclka_cfgcr0_clk_off(dev_priv, phy);
> -	intel_de_write(dev_priv, ICL_DPCLKA_CFGCR0, val);
> +	intel_de_write(dev_priv, reg, val);
>  
>  	mutex_unlock(&dev_priv->dpll.lock);
>  }
> @@ -3150,9 +3155,17 @@ static void icl_unmap_plls_to_ports(struct intel_encoder *encoder)
>  
>  	mutex_lock(&dev_priv->dpll.lock);
>  
> -	val = intel_de_read(dev_priv, ICL_DPCLKA_CFGCR0);
> +	if (IS_ALDERLAKE_S(dev_priv))
> +		val = intel_de_read(dev_priv, ADLS_DPCLKA_CFGCR(phy));
> +	else
> +		val = intel_de_read(dev_priv, ICL_DPCLKA_CFGCR0);
> +
>  	val |= icl_dpclka_cfgcr0_clk_off(dev_priv, phy);
> -	intel_de_write(dev_priv, ICL_DPCLKA_CFGCR0, val);
> +
> +	if (IS_ALDERLAKE_S(dev_priv))
> +		intel_de_write(dev_priv, ADLS_DPCLKA_CFGCR(phy), val);
> +	else
> +		intel_de_write(dev_priv, ICL_DPCLKA_CFGCR0, val);

We could potentially assign the register to a local at the top of the
function like we did in icl_map_plls_to_ports() to avoid having to do
two separate conditionals.  Up to you though; it doesn't really matter
either way.

>  
>  	mutex_unlock(&dev_priv->dpll.lock);
>  }
> @@ -3192,13 +3205,19 @@ static void icl_sanitize_port_clk_off(struct drm_i915_private *dev_priv,
>  				      u32 port_mask, bool ddi_clk_needed)
>  {
>  	enum port port;
> +	bool ddi_clk_off;
>  	u32 val;
>  
> -	val = intel_de_read(dev_priv, ICL_DPCLKA_CFGCR0);
>  	for_each_port_masked(port, port_mask) {
>  		enum phy phy = intel_port_to_phy(dev_priv, port);
> -		bool ddi_clk_off = val & icl_dpclka_cfgcr0_clk_off(dev_priv,
> -								   phy);
> +
> +		if (IS_ALDERLAKE_S(dev_priv))
> +			val = intel_de_read(dev_priv, ADLS_DPCLKA_CFGCR(phy));
> +		else
> +			val = intel_de_read(dev_priv, ICL_DPCLKA_CFGCR0);
> +
> +		ddi_clk_off = val & icl_dpclka_cfgcr0_clk_off(dev_priv,
> +							      phy);
>  
>  		if (ddi_clk_needed == !ddi_clk_off)
>  			continue;
> @@ -3214,7 +3233,10 @@ static void icl_sanitize_port_clk_off(struct drm_i915_private *dev_priv,
>  			   "PHY %c is disabled/in DSI mode with an ungated DDI clock, gate it\n",
>  			   phy_name(phy));
>  		val |= icl_dpclka_cfgcr0_clk_off(dev_priv, phy);
> -		intel_de_write(dev_priv, ICL_DPCLKA_CFGCR0, val);
> +		if (IS_ALDERLAKE_S(dev_priv))
> +			intel_de_write(dev_priv, ADLS_DPCLKA_CFGCR(phy), val);
> +		else
> +			intel_de_write(dev_priv, ICL_DPCLKA_CFGCR0, val);

Same comment here.

Either way,

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

The way the bits are spread across two different registers and with
strange offsets is sort of an unintuitive hardware design, but your
implementation here looks correct to me.


Matt

>  	}
>  }
>  
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 2d1c5bfe4032..0ff0eeabab8c 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -11028,6 +11028,20 @@ static int hsw_crtc_compute_clock(struct intel_crtc *crtc,
>  	return 0;
>  }
>  
> +static void adls_get_ddi_pll(struct drm_i915_private *dev_priv, enum port port,
> +			     struct intel_crtc_state *pipe_config)
> +{
> +	enum phy phy = intel_port_to_phy(dev_priv, port);
> +	enum intel_dpll_id id;
> +	u32 val;
> +
> +	val = intel_de_read(dev_priv, ADLS_DPCLKA_CFGCR(phy));
> +	val &= ADLS_DPCLKA_CFGCR_DDI_CLK_SEL_MASK(phy);
> +	id = val >> ADLS_DPCLKA_CFGCR_DDI_SHIFT(phy);
> +
> +	pipe_config->shared_dpll = intel_get_shared_dpll_by_id(dev_priv, id);
> +}
> +
>  static void dg1_get_ddi_pll(struct drm_i915_private *dev_priv, enum port port,
>  			    struct intel_crtc_state *pipe_config)
>  {
> @@ -11401,7 +11415,9 @@ static void hsw_get_ddi_port_state(struct intel_crtc *crtc,
>  			port = TRANS_DDI_FUNC_CTL_VAL_TO_PORT(tmp);
>  	}
>  
> -	if (IS_DG1(dev_priv))
> +	if (IS_ALDERLAKE_S(dev_priv))
> +		adls_get_ddi_pll(dev_priv, port, pipe_config);
> +	else if (IS_DG1(dev_priv))
>  		dg1_get_ddi_pll(dev_priv, port, pipe_config);
>  	else if (INTEL_GEN(dev_priv) >= 11)
>  		icl_get_ddi_pll(dev_priv, port, pipe_config);
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 999b4eb422db..ce4ef7fa4000 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -10307,7 +10307,7 @@ enum skl_power_gate {
>  
>  /* ICL Clocks */
>  #define ICL_DPCLKA_CFGCR0			_MMIO(0x164280)
> -#define  ICL_DPCLKA_CFGCR0_DDI_CLK_OFF(phy)	(1 << _PICK(phy, 10, 11, 24))
> +#define  ICL_DPCLKA_CFGCR0_DDI_CLK_OFF(phy)	(1 << _PICK(phy, 10, 11, 24, 4, 5))
>  #define  RKL_DPCLKA_CFGCR0_DDI_CLK_OFF(phy)	REG_BIT((phy) + 10)
>  #define  ICL_DPCLKA_CFGCR0_TC_CLK_OFF(tc_port)	(1 << ((tc_port) < TC_PORT_4 ? \
>  						       (tc_port) + 12 : \
> @@ -10342,6 +10342,27 @@ enum skl_power_gate {
>  #define   DG1_DPCLKA_CFGCR0_DDI_CLK_SEL_DPLL_MAP(clk_sel, phy) \
>  	(((clk_sel) >> DG1_DPCLKA_CFGCR0_DDI_CLK_SEL_SHIFT(phy)) + _DG1_PHY_DPLL_MAP(phy))
>  
> +/* ADLS Clocks */
> +#define _ADLS_DPCLKA_CFGCR0			0x164280
> +#define _ADLS_DPCLKA_CFGCR1			0x1642BC
> +#define ADLS_DPCLKA_CFGCR(phy)			_MMIO_PHY((phy) / 3, \
> +							  _ADLS_DPCLKA_CFGCR0, \
> +							  _ADLS_DPCLKA_CFGCR1)
> +#define  ADLS_DPCLKA_CFGCR_DDI_SHIFT(phy)		(((phy) % 3) * 2)
> +/* ADLS DPCLKA_CFGCR0 DDI mask */
> +#define  ADLS_DPCLKA_DDII_SEL_MASK			REG_GENMASK(5, 4)
> +#define  ADLS_DPCLKA_DDIB_SEL_MASK			REG_GENMASK(3, 2)
> +#define  ADLS_DPCLKA_DDIA_SEL_MASK			REG_GENMASK(1, 0)
> +/* ADLS DPCLKA_CFGCR1 DDI mask */
> +#define  ADLS_DPCLKA_DDIK_SEL_MASK			REG_GENMASK(3, 2)
> +#define  ADLS_DPCLKA_DDIJ_SEL_MASK			REG_GENMASK(1, 0)
> +#define  ADLS_DPCLKA_CFGCR_DDI_CLK_SEL_MASK(phy)	_PICK((phy), \
> +							ADLS_DPCLKA_DDIA_SEL_MASK, \
> +							ADLS_DPCLKA_DDIB_SEL_MASK, \
> +							ADLS_DPCLKA_DDII_SEL_MASK, \
> +							ADLS_DPCLKA_DDIJ_SEL_MASK, \
> +							ADLS_DPCLKA_DDIK_SEL_MASK)
> +
>  /* CNL PLL */
>  #define DPLL0_ENABLE		0x46010
>  #define DPLL1_ENABLE		0x46014
> -- 
> 2.27.0
> 

-- 
Matt Roper
Graphics Software Engineer
VTT-OSGC Platform Enablement
Intel Corporation
(916) 356-2795
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