From bd480061788fe2f657daba7e519c9175b7dba968 Mon Sep 17 00:00:00 2001 From: Imre Deak Date: Fri, 1 Apr 2016 16:02:44 +0300 Subject: [PATCH] drm/i915/bxt: Don't reprogram an already enabled DDI PHY MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Ville Syrjälä Link: http://patchwork.freedesktop.org/patch/msgid/1459515767-29228-14-git-send-email-imre.deak@intel.com --- 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 ad8f50eec8ffe..a3db4daec8449 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); -- 2.39.5