Re: [PATCH 14/19] drm/i915: State readout support for WRPLLs

[Damien Lespiau <damien.lespiau@intel.com>]

On Fri, Jul 04, 2014 at 11:27:39AM -0300, Paulo Zanoni wrote:
> From: Daniel Vetter <daniel.vetter@ffwll.ch>
> 
> Still tacked onto the side, but slowly getting there.
> 
> v2: Don't forget the debugfs file.
> 
> v3 (from Paulo): Don't forget to check the power domains.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>

As always, there's nothing replacing testing:

for v3: Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>

-- 
Damien

> ---
>  drivers/gpu/drm/i915/i915_debugfs.c  |  1 +
>  drivers/gpu/drm/i915/i915_drv.h      |  1 +
>  drivers/gpu/drm/i915/i915_reg.h      |  1 +
>  drivers/gpu/drm/i915/intel_ddi.c     | 19 +++++++++++++++++++
>  drivers/gpu/drm/i915/intel_display.c |  9 +++++++++
>  5 files changed, 31 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index e79ddbf..7d72768 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -2409,6 +2409,7 @@ static int i915_shared_dplls_info(struct seq_file *m, void *unused)
>  		seq_printf(m, " dpll_md: 0x%08x\n", pll->hw_state.dpll_md);
>  		seq_printf(m, " fp0:     0x%08x\n", pll->hw_state.fp0);
>  		seq_printf(m, " fp1:     0x%08x\n", pll->hw_state.fp1);
> +		seq_printf(m, " wrpll:   0x%08x\n", pll->hw_state.wrpll);
>  	}
>  	drm_modeset_unlock_all(dev);
>  
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 2ec7cb6..c1fa561 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -197,6 +197,7 @@ struct intel_dpll_hw_state {
>  	uint32_t dpll_md;
>  	uint32_t fp0;
>  	uint32_t fp1;
> +	uint32_t wrpll;
>  };
>  
>  struct intel_shared_dpll {
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 3d61a53..654417e 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -5900,6 +5900,7 @@ enum punit_power_well {
>  /* WRPLL */
>  #define WRPLL_CTL1			0x46040
>  #define WRPLL_CTL2			0x46060
> +#define WRPLL_CTL(pll)			(pll == 0 ? WRPLL_CTL1 : WRPLL_CTL2)
>  #define  WRPLL_PLL_ENABLE		(1<<31)
>  #define  WRPLL_PLL_SSC			(1<<28)
>  #define  WRPLL_PLL_NON_SSC		(2<<28)
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index fae73d3..79cbb5e 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -790,6 +790,8 @@ bool intel_ddi_pll_select(struct intel_crtc *intel_crtc)
>  			intel_crtc->config.ddi_pll_sel = PORT_CLK_SEL_WRPLL2;
>  			intel_crtc->config.shared_dpll = DPLL_ID_WRPLL2;
>  		}
> +
> +		intel_crtc->config.dpll_hw_state.wrpll = val;
>  	}
>  
>  	return true;
> @@ -1315,6 +1317,21 @@ int intel_ddi_get_cdclk_freq(struct drm_i915_private *dev_priv)
>  	}
>  }
>  
> +static bool hsw_ddi_pll_get_hw_state(struct drm_i915_private *dev_priv,
> +				     struct intel_shared_dpll *pll,
> +				     struct intel_dpll_hw_state *hw_state)
> +{
> +	uint32_t val;
> +
> +	if (!intel_display_power_enabled(dev_priv, POWER_DOMAIN_PLLS))
> +		return false;
> +
> +	val = I915_READ(WRPLL_CTL(pll->id));
> +	hw_state->wrpll = val;
> +
> +	return val & WRPLL_PLL_ENABLE;
> +}
> +
>  static char *hsw_ddi_pll_names[] = {
>  	"WRPLL 1",
>  	"WRPLL 2",
> @@ -1333,6 +1350,8 @@ void intel_ddi_pll_init(struct drm_device *dev)
>  	for (i = 0; i < 2; i++) {
>  		dev_priv->shared_dplls[i].id = i;
>  		dev_priv->shared_dplls[i].name = hsw_ddi_pll_names[i];
> +		dev_priv->shared_dplls[i].get_hw_state =
> +			hsw_ddi_pll_get_hw_state;
>  	}
>  
>  	/* The LCPLL register should be turned on by the BIOS. For now let's
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 1d919ae..594a49f 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -7587,6 +7587,7 @@ static void haswell_get_ddi_port_state(struct intel_crtc *crtc,
>  {
>  	struct drm_device *dev = crtc->base.dev;
>  	struct drm_i915_private *dev_priv = dev->dev_private;
> +	struct intel_shared_dpll *pll;
>  	enum port port;
>  	uint32_t tmp;
>  
> @@ -7605,6 +7606,13 @@ static void haswell_get_ddi_port_state(struct intel_crtc *crtc,
>  		break;
>  	}
>  
> +	if (pipe_config->shared_dpll >= 0) {
> +		pll = &dev_priv->shared_dplls[pipe_config->shared_dpll];
> +
> +		WARN_ON(!pll->get_hw_state(dev_priv, pll,
> +					   &pipe_config->dpll_hw_state));
> +	}
> +
>  	/*
>  	 * Haswell has only FDI/PCH transcoder A. It is which is connected to
>  	 * DDI E. So just check whether this pipe is wired to DDI E and whether
> @@ -10436,6 +10444,7 @@ intel_pipe_config_compare(struct drm_device *dev,
>  	PIPE_CONF_CHECK_X(dpll_hw_state.dpll_md);
>  	PIPE_CONF_CHECK_X(dpll_hw_state.fp0);
>  	PIPE_CONF_CHECK_X(dpll_hw_state.fp1);
> +	PIPE_CONF_CHECK_X(dpll_hw_state.wrpll);
>  
>  	if (IS_G4X(dev) || INTEL_INFO(dev)->gen >= 5)
>  		PIPE_CONF_CHECK_I(pipe_bpp);
> -- 
> 2.0.0
> 
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