On Tue, May 24, 2016 at 03:38:32PM +0300, Imre Deak wrote:
> If the CDCLK PLL isn't locked or incorrectly configured we can just
> assume that it's off resulting in fully re-initializing both CDCLK PLL
> and CDCLK dividers. This way the CDCLK PLL sanitization added in the
> following patch can be done on BXT the same way as it's done on SKL.
>
> v2: (Ville)
> - Remove the remaining PLL specific checks from skl_sanitize_cdclk() and
> depend instead on the corresponding check in skl_dpll0_update().
> - Use vco == 0 instead of the corresponding boolean check in
> skl_sanitize_cdclk().
>
> CC: Ville Syrjälä <ville.syrj...@linux.intel.com>
> Signed-off-by: Imre Deak <imre.d...@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> ---
> drivers/gpu/drm/i915/intel_display.c | 39
> +++++++++++++++---------------------
> 1 file changed, 16 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c
> b/drivers/gpu/drm/i915/intel_display.c
> index c1e666b..47b2466 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -5461,21 +5461,22 @@ skl_dpll0_update(struct drm_i915_private *dev_priv)
> u32 val;
>
> dev_priv->cdclk_pll.ref = 24000;
> + dev_priv->cdclk_pll.vco = 0;
>
> val = I915_READ(LCPLL1_CTL);
> - if ((val & LCPLL_PLL_ENABLE) == 0) {
> - dev_priv->cdclk_pll.vco = 0;
> + if ((val & LCPLL_PLL_ENABLE) == 0)
> return;
> - }
>
> - WARN_ON((val & LCPLL_PLL_LOCK) == 0);
> + if (WARN_ON((val & LCPLL_PLL_LOCK) == 0))
> + return;
>
> val = I915_READ(DPLL_CTRL1);
>
> - WARN_ON((val & (DPLL_CTRL1_HDMI_MODE(SKL_DPLL0) |
> - DPLL_CTRL1_SSC(SKL_DPLL0) |
> - DPLL_CTRL1_OVERRIDE(SKL_DPLL0))) !=
> - DPLL_CTRL1_OVERRIDE(SKL_DPLL0));
> + if (WARN_ON((val & (DPLL_CTRL1_HDMI_MODE(SKL_DPLL0) |
> + DPLL_CTRL1_SSC(SKL_DPLL0) |
> + DPLL_CTRL1_OVERRIDE(SKL_DPLL0))) !=
> + DPLL_CTRL1_OVERRIDE(SKL_DPLL0)))
> + return;
>
> switch (val & DPLL_CTRL1_LINK_RATE_MASK(SKL_DPLL0)) {
> case DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_810, SKL_DPLL0):
> @@ -5490,7 +5491,6 @@ skl_dpll0_update(struct drm_i915_private *dev_priv)
> break;
> default:
> MISSING_CASE(val & DPLL_CTRL1_LINK_RATE_MASK(SKL_DPLL0));
> - dev_priv->cdclk_pll.vco = 0;
> break;
> }
> }
> @@ -5690,19 +5690,12 @@ static void skl_sanitize_cdclk(struct
> drm_i915_private *dev_priv)
> if ((I915_READ(SWF_ILK(0x18)) & 0x00FFFFFF) == 0)
> goto sanitize;
>
> + intel_update_cdclk(dev_priv->dev);
> /* Is PLL enabled and locked ? */
> - if ((I915_READ(LCPLL1_CTL) & (LCPLL_PLL_ENABLE | LCPLL_PLL_LOCK)) !=
> - (LCPLL_PLL_ENABLE | LCPLL_PLL_LOCK))
> + if (dev_priv->cdclk_pll.vco == 0 ||
> + dev_priv->cdclk_freq == dev_priv->cdclk_pll.ref)
> goto sanitize;
>
> - if ((I915_READ(DPLL_CTRL1) & (DPLL_CTRL1_HDMI_MODE(SKL_DPLL0) |
> - DPLL_CTRL1_SSC(SKL_DPLL0) |
> - DPLL_CTRL1_OVERRIDE(SKL_DPLL0))) !=
> - DPLL_CTRL1_OVERRIDE(SKL_DPLL0))
> - goto sanitize;
> -
> - intel_update_cdclk(dev_priv->dev);
> -
> /* DPLL okay; verify the cdclock
> *
> * Noticed in some instances that the freq selection is correct but
> @@ -6608,14 +6601,14 @@ static void bxt_de_pll_update(struct drm_i915_private
> *dev_priv)
> u32 val;
>
> dev_priv->cdclk_pll.ref = 19200;
> + dev_priv->cdclk_pll.vco = 0;
>
> val = I915_READ(BXT_DE_PLL_ENABLE);
> - if ((val & BXT_DE_PLL_PLL_ENABLE) == 0) {
> - dev_priv->cdclk_pll.vco = 0;
> + if ((val & BXT_DE_PLL_PLL_ENABLE) == 0)
> return;
> - }
>
> - WARN_ON((val & BXT_DE_PLL_LOCK) == 0);
> + if (WARN_ON((val & BXT_DE_PLL_LOCK) == 0))
> + return;
>
> val = I915_READ(BXT_DE_PLL_CTL);
> dev_priv->cdclk_pll.vco = (val & BXT_DE_PLL_RATIO_MASK) *
> --
> 2.5.0
--
Ville Syrjälä
Intel OTC
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