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@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_ddi.c | 40 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index d16effd..8f06d6c 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -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);
--
2.5.0
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