From e93da0a0137b14f94ab4f1b6d74ca7504e8cb065 Mon Sep 17 00:00:00 2001 From: Imre Deak Date: Mon, 13 Jun 2016 16:44:37 +0300 Subject: drm/i915/bxt: Sanitiy check the PHY lane power down status MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit We can check the power state of the PHY data and common lanes as reported by the PHY. Do this in case we need to debug problems where the PHY gets stuck in an unexpected state. Note that I only check these when the lanes are expected to be powered on purpose, since it's not clear at what point the PHY power/clock gates things. v2: - Don't report the encoder as disabled when the sanity check fails. (Ville) CC: Ville Syrjälä Signed-off-by: Imre Deak Reviewed-by: Ville Syrjälä Link: http://patchwork.freedesktop.org/patch/msgid/1465825477-32671-1-git-send-email-imre.deak@intel.com --- drivers/gpu/drm/i915/intel_ddi.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'drivers/gpu/drm/i915/intel_ddi.c') diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c index cb48b0d729e8..ad3b0ee5e55b 100644 --- a/drivers/gpu/drm/i915/intel_ddi.c +++ b/drivers/gpu/drm/i915/intel_ddi.c @@ -1342,6 +1342,14 @@ bool intel_ddi_get_hw_state(struct intel_encoder *encoder, DRM_DEBUG_KMS("No pipe for ddi port %c found\n", port_name(port)); out: + if (ret && IS_BROXTON(dev_priv)) { + tmp = I915_READ(BXT_PHY_CTL(port)); + if ((tmp & (BXT_PHY_LANE_POWERDOWN_ACK | + BXT_PHY_LANE_ENABLED)) != BXT_PHY_LANE_ENABLED) + DRM_ERROR("Port %c enabled but PHY powered down? " + "(PHY_CTL %08x)\n", port_name(port), tmp); + } + intel_display_power_put(dev_priv, power_domain); return ret; @@ -1745,6 +1753,8 @@ static void intel_disable_ddi(struct intel_encoder *intel_encoder) bool bxt_ddi_phy_is_enabled(struct drm_i915_private *dev_priv, enum dpio_phy phy) { + enum port port; + if (!(I915_READ(BXT_P_CR_GT_DISP_PWRON) & GT_DISPLAY_POWER_ON(phy))) return false; @@ -1770,6 +1780,21 @@ bool bxt_ddi_phy_is_enabled(struct drm_i915_private *dev_priv, return false; } + for_each_port_masked(port, + phy == DPIO_PHY0 ? BIT(PORT_B) | BIT(PORT_C) : + BIT(PORT_A)) { + u32 tmp = I915_READ(BXT_PHY_CTL(port)); + + if (tmp & BXT_PHY_CMNLANE_POWERDOWN_ACK) { + DRM_DEBUG_DRIVER("DDI PHY %d powered, but common lane " + "for port %c powered down " + "(PHY_CTL %08x)\n", + phy, port_name(port), tmp); + + return false; + } + } + return true; } -- cgit v1.2.3