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drm/i915/bxt: Don't reprogram an already enabled DDI PHY

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If BIOS has already programmed and enabled a PHY, don't reprogram it as
that may interfere with the currently active outputs. A follow-up patch
will add state verification, so we can catch any misconfiguration on
BIOS's behalf.

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/1459515767-29228-14-git-send-email-imre.deak@intel.com
This commit is contained in:
Imre Deak 2016-04-01 16:02:44 +03:00
parent c2e001ef84
commit bd48006178
1 changed files with 40 additions and 0 deletions
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40
drivers/gpu/drm/i915/intel_ddi.c
View File

@ -1722,12 +1722,52 @@ static void intel_disable_ddi(struct intel_encoder *intel_encoder)
}
}
static bool broxton_phy_is_enabled(struct drm_i915_private *dev_priv,
enum dpio_phy phy)
{
if (!(I915_READ(BXT_P_CR_GT_DISP_PWRON) & GT_DISPLAY_POWER_ON(phy)))
return false;
if ((I915_READ(BXT_PORT_CL1CM_DW0(phy)) &
(PHY_POWER_GOOD | PHY_RESERVED)) != PHY_POWER_GOOD) {
DRM_DEBUG_DRIVER("DDI PHY %d powered, but power hasn't settled\n",
phy);
return false;
}
if (phy == DPIO_PHY1 &&
!(I915_READ(BXT_PORT_REF_DW3(DPIO_PHY1)) & GRC_DONE)) {
DRM_DEBUG_DRIVER("DDI PHY 1 powered, but GRC isn't done\n");
return false;
}
if (!(I915_READ(BXT_PHY_CTL_FAMILY(phy)) & COMMON_RESET_DIS)) {
DRM_DEBUG_DRIVER("DDI PHY %d powered, but still in reset\n",
phy);
return false;
}
return true;
}
static void broxton_phy_init(struct drm_i915_private *dev_priv,
enum dpio_phy phy)
{
enum port port;
u32 ports, val;
if (broxton_phy_is_enabled(dev_priv, phy)) {
DRM_DEBUG_DRIVER("DDI PHY %d already enabled, "
"won't reprogram it\n", phy);
return;
}
DRM_DEBUG_DRIVER("DDI PHY %d not enabled, enabling it\n", phy);
val = I915_READ(BXT_P_CR_GT_DISP_PWRON);
val |= GT_DISPLAY_POWER_ON(phy);
I915_WRITE(BXT_P_CR_GT_DISP_PWRON, val);