From 71300132975f364a0d3ebf68671a2ce4923191db Mon Sep 17 00:00:00 2001 From: Imre Deak Date: Mon, 2 Oct 2017 16:53:07 +0300 Subject: [PATCH] drm/i915: Fix DDI PHY init if it was already on The common lane power down flag of a DPIO PHY has a funky semantic: after the initial enabling of the PHY (so from a disabled state) this flag will be clear. It will be set only after the PHY will be used for the first time (for instance due to enabling the corresponding pipe) and then become unused (due to disabling the pipe). During the initial PHY enablement we don't know which of the above phases we are in, so move the check for the flag where this is known, the HW readout code. This is where the rest of lane power down status checks are done anyway. This fixes at least a problem on GLK where after module reloading, the common lane power down flag of PHY1 is set, but the PHY is actually powered-on and properly set up. The GRC readout code for other PHYs will hence think that PHY1 is not powered initially and disable it after the GRC readout. This will cause the AUX power well related to PHY1 to get disabled in a stuck state, timing out when we try to enable it later. Cc: Ville Syrjala Fixes: e93da0a0137b ("drm/i915/bxt: Sanitiy check the PHY lane power down status") Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102777 Signed-off-by: Imre Deak Reviewed-by: Rodrigo Vivi Link: https://patchwork.freedesktop.org/patch/msgid/20171002135307.26117-1-imre.deak@intel.com (cherry picked from commit e19c1eb885ac4186e64c7e484424124f3145318e) Signed-off-by: Rodrigo Vivi --- drivers/gpu/drm/i915/intel_ddi.c | 3 ++- drivers/gpu/drm/i915/intel_dpio_phy.c | 20 -------------------- 2 files changed, 2 insertions(+), 21 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c index 4b4fd1f8110b..476681d5940c 100644 --- a/drivers/gpu/drm/i915/intel_ddi.c +++ b/drivers/gpu/drm/i915/intel_ddi.c @@ -1655,7 +1655,8 @@ bool intel_ddi_get_hw_state(struct intel_encoder *encoder, out: if (ret && IS_GEN9_LP(dev_priv)) { tmp = I915_READ(BXT_PHY_CTL(port)); - if ((tmp & (BXT_PHY_LANE_POWERDOWN_ACK | + if ((tmp & (BXT_PHY_CMNLANE_POWERDOWN_ACK | + 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); diff --git a/drivers/gpu/drm/i915/intel_dpio_phy.c b/drivers/gpu/drm/i915/intel_dpio_phy.c index 09b670929786..de38d014ed39 100644 --- a/drivers/gpu/drm/i915/intel_dpio_phy.c +++ b/drivers/gpu/drm/i915/intel_dpio_phy.c @@ -208,12 +208,6 @@ static const struct bxt_ddi_phy_info glk_ddi_phy_info[] = { }, }; -static u32 bxt_phy_port_mask(const struct bxt_ddi_phy_info *phy_info) -{ - return (phy_info->dual_channel * BIT(phy_info->channel[DPIO_CH1].port)) | - BIT(phy_info->channel[DPIO_CH0].port); -} - static const struct bxt_ddi_phy_info * bxt_get_phy_list(struct drm_i915_private *dev_priv, int *count) { @@ -313,7 +307,6 @@ bool bxt_ddi_phy_is_enabled(struct drm_i915_private *dev_priv, enum dpio_phy phy) { const struct bxt_ddi_phy_info *phy_info; - enum port port; phy_info = bxt_get_phy_info(dev_priv, phy); @@ -335,19 +328,6 @@ bool bxt_ddi_phy_is_enabled(struct drm_i915_private *dev_priv, return false; } - for_each_port_masked(port, bxt_phy_port_mask(phy_info)) { - 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; } -- 2.20.1