diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_bios.c | 3 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_combo_phy.c | 36 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_reg.h | 1 |
3 files changed, 40 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c index c4710889cb32..0c9808132d67 100644 --- a/drivers/gpu/drm/i915/display/intel_bios.c +++ b/drivers/gpu/drm/i915/display/intel_bios.c @@ -1668,6 +1668,9 @@ parse_general_definitions(struct drm_i915_private *dev_priv, if (!child->device_type) continue; + DRM_DEBUG_KMS("Found VBT child device with type 0x%x\n", + child->device_type); + /* * Copy as much as we know (sizeof) and is available * (child_dev_size) of the child device. Accessing the data must diff --git a/drivers/gpu/drm/i915/display/intel_combo_phy.c b/drivers/gpu/drm/i915/display/intel_combo_phy.c index 841708da5a56..075bab2500eb 100644 --- a/drivers/gpu/drm/i915/display/intel_combo_phy.c +++ b/drivers/gpu/drm/i915/display/intel_combo_phy.c @@ -260,6 +260,32 @@ void intel_combo_phy_power_up_lanes(struct drm_i915_private *dev_priv, I915_WRITE(ICL_PORT_CL_DW10(port), val); } +static u32 ehl_combo_phy_a_mux(struct drm_i915_private *i915, u32 val) +{ + bool ddi_a_present = i915->vbt.ddi_port_info[PORT_A].child != NULL; + bool ddi_d_present = i915->vbt.ddi_port_info[PORT_D].child != NULL; + bool dsi_present = intel_bios_is_dsi_present(i915, NULL); + + /* + * VBT's 'dvo port' field for child devices references the DDI, not + * the PHY. So if combo PHY A is wired up to drive an external + * display, we should see a child device present on PORT_D and + * nothing on PORT_A and no DSI. + */ + if (ddi_d_present && !ddi_a_present && !dsi_present) + return val | ICL_PHY_MISC_MUX_DDID; + + /* + * If we encounter a VBT that claims to have an external display on + * DDI-D _and_ an internal display on DDI-A/DSI leave an error message + * in the log and let the internal display win. + */ + if (ddi_d_present) + DRM_ERROR("VBT claims to have both internal and external displays on PHY A. Configuring for internal.\n"); + + return val & ~ICL_PHY_MISC_MUX_DDID; +} + static void icl_combo_phys_init(struct drm_i915_private *dev_priv) { enum port port; @@ -273,7 +299,17 @@ static void icl_combo_phys_init(struct drm_i915_private *dev_priv) continue; } + /* + * EHL's combo PHY A can be hooked up to either an external + * display (via DDI-D) or an internal display (via DDI-A or + * the DSI DPHY). This is a motherboard design decision that + * can't be changed on the fly, so initialize the PHY's mux + * based on whether our VBT indicates the presence of any + * "internal" child devices. + */ val = I915_READ(ICL_PHY_MISC(port)); + if (IS_ELKHARTLAKE(dev_priv) && port == PORT_A) + val = ehl_combo_phy_a_mux(dev_priv, val); val &= ~ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN; I915_WRITE(ICL_PHY_MISC(port), val); diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index a408886adb47..02c7f8c6c20b 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -11145,6 +11145,7 @@ enum skl_power_gate { #define _ICL_PHY_MISC_B 0x64C04 #define ICL_PHY_MISC(port) _MMIO_PORT(port, _ICL_PHY_MISC_A, \ _ICL_PHY_MISC_B) +#define ICL_PHY_MISC_MUX_DDID (1 << 28) #define ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN (1 << 23) /* Icelake Display Stream Compression Registers */ |