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drm/i915/gen9: Assume CDCLK PLL is off if it's not locked

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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.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1464093513-16258-1-git-send-email-imre.deak@intel.com
This commit is contained in:
Imre Deak 2016-05-24 15:38:32 +03:00
parent 5a21b6650a
commit 1c3f7700b2
1 changed files with 17 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
drivers/gpu/drm/i915/intel_display.c
View File

@ -5540,21 +5540,22 @@ skl_dpll0_update(struct drm_i915_private *dev_priv)
u32 val; u32 val;
dev_priv->cdclk_pll.ref = 24000; dev_priv->cdclk_pll.ref = 24000;
dev_priv->cdclk_pll.vco = 0;
val = I915_READ(LCPLL1_CTL); val = I915_READ(LCPLL1_CTL);
if ((val & LCPLL_PLL_ENABLE) == 0) { if ((val & LCPLL_PLL_ENABLE) == 0)
dev_priv->cdclk_pll.vco = 0;
return; return;
}
WARN_ON((val & LCPLL_PLL_LOCK) == 0); if (WARN_ON((val & LCPLL_PLL_LOCK) == 0))
return;
val = I915_READ(DPLL_CTRL1); val = I915_READ(DPLL_CTRL1);
WARN_ON((val & (DPLL_CTRL1_HDMI_MODE(SKL_DPLL0) | if (WARN_ON((val & (DPLL_CTRL1_HDMI_MODE(SKL_DPLL0) |
DPLL_CTRL1_SSC(SKL_DPLL0) | DPLL_CTRL1_SSC(SKL_DPLL0) |
DPLL_CTRL1_OVERRIDE(SKL_DPLL0))) != DPLL_CTRL1_OVERRIDE(SKL_DPLL0))) !=
DPLL_CTRL1_OVERRIDE(SKL_DPLL0)); DPLL_CTRL1_OVERRIDE(SKL_DPLL0)))
return;
switch (val & DPLL_CTRL1_LINK_RATE_MASK(SKL_DPLL0)) { switch (val & DPLL_CTRL1_LINK_RATE_MASK(SKL_DPLL0)) {
case DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_810, SKL_DPLL0): case DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_810, SKL_DPLL0):
@ -5569,7 +5570,6 @@ skl_dpll0_update(struct drm_i915_private *dev_priv)
break; break;
default: default:
MISSING_CASE(val & DPLL_CTRL1_LINK_RATE_MASK(SKL_DPLL0)); MISSING_CASE(val & DPLL_CTRL1_LINK_RATE_MASK(SKL_DPLL0));
dev_priv->cdclk_pll.vco = 0;
break; break;
} }
} }
@ -5769,18 +5769,11 @@ static void skl_sanitize_cdclk(struct drm_i915_private *dev_priv)
if ((I915_READ(SWF_ILK(0x18)) & 0x00FFFFFF) == 0) if ((I915_READ(SWF_ILK(0x18)) & 0x00FFFFFF) == 0)
goto sanitize; goto sanitize;
/* Is PLL enabled and locked ? */
if ((I915_READ(LCPLL1_CTL) & (LCPLL_PLL_ENABLE | LCPLL_PLL_LOCK)) !=
(LCPLL_PLL_ENABLE | LCPLL_PLL_LOCK))
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); intel_update_cdclk(dev_priv->dev);
/* Is PLL enabled and locked ? */
if (dev_priv->cdclk_pll.vco == 0 ||
dev_priv->cdclk_freq == dev_priv->cdclk_pll.ref)
goto sanitize;
/* DPLL okay; verify the cdclock /* DPLL okay; verify the cdclock
* *
@ -6681,14 +6674,14 @@ static void bxt_de_pll_update(struct drm_i915_private *dev_priv)
u32 val; u32 val;
dev_priv->cdclk_pll.ref = 19200; dev_priv->cdclk_pll.ref = 19200;
dev_priv->cdclk_pll.vco = 0;
val = I915_READ(BXT_DE_PLL_ENABLE); val = I915_READ(BXT_DE_PLL_ENABLE);
if ((val & BXT_DE_PLL_PLL_ENABLE) == 0) { if ((val & BXT_DE_PLL_PLL_ENABLE) == 0)
dev_priv->cdclk_pll.vco = 0;
return; 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); val = I915_READ(BXT_DE_PLL_CTL);
dev_priv->cdclk_pll.vco = (val & BXT_DE_PLL_RATIO_MASK) * dev_priv->cdclk_pll.vco = (val & BXT_DE_PLL_RATIO_MASK) *