From: Ville Syrjälä <ville.syrj...@linux.intel.com>
Make HSW/BDW use the new VBT child device driven output
probing as well. To achieve that the strap checks are
moved into intel_ddi_init() itself.
I have one HSW ULT laptop here which declares all the ports
A-D in the VBT, so in order to avoid assert_port_valid() tripping
on DDI D (which is not present on ULT/ULX) I kept the strap
check as the first thing we do. Thought arguably this particular
machine is an internal development device so not something any
real user should have. But I suppose it's possible that real
consumer systems also had similar VBTs in this era.
Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
drivers/gpu/drm/i915/display/intel_ddi.c | 37 +++++++++++++++++---
drivers/gpu/drm/i915/display/intel_display.c | 17 +--------
2 files changed, 34 insertions(+), 20 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c
b/drivers/gpu/drm/i915/display/intel_ddi.c
index e94eb7bb6e53..6deaa3433958 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -4277,8 +4277,29 @@ static bool port_in_use(struct drm_i915_private *i915,
enum port port)
return false;
}
+static bool port_strap_detected(struct drm_i915_private *i915, enum port port)
+{
+ /* straps not used on skl+ */
+ if (DISPLAY_VER(i915) >= 9)
+ return true;
+
+ switch (port) {
+ case PORT_A:
+ return intel_de_read(i915, DDI_BUF_CTL(PORT_A)) &
DDI_INIT_DISPLAY_DETECTED;
+ case PORT_B:
+ return intel_de_read(i915, SFUSE_STRAP) &
SFUSE_STRAP_DDIB_DETECTED;
+ case PORT_C:
+ return intel_de_read(i915, SFUSE_STRAP) &
SFUSE_STRAP_DDIC_DETECTED;
+ case PORT_D:
+ return intel_de_read(i915, SFUSE_STRAP) &
SFUSE_STRAP_DDID_DETECTED;
+ default:
+ MISSING_CASE(port);
+ return false;
+ }
+}
+
void intel_ddi_init(struct drm_i915_private *dev_priv,
struct intel_bios_encoder_data *devdata,
enum port port)
{
@@ -4286,8 +4307,20 @@ void intel_ddi_init(struct drm_i915_private *dev_priv,
struct intel_encoder *encoder;
bool init_hdmi, init_dp;
enum phy phy = intel_port_to_phy(dev_priv, port);
+ /*
+ * On some HSW ULT systems the VBT has been observed
+ * to advertise DDI D, even though it does not exist on
+ * the platform. Check the strap first to avoid tripping
+ * assert_port_valid().
+ */
+ if (!port_strap_detected(dev_priv, port)) {
+ drm_dbg_kms(&dev_priv->drm,
+ "Port %c strap not detected\n", port_name(port));
+ return;
+ }
+
if (!assert_port_valid(dev_priv, port))
return;
if (port_in_use(dev_priv, port)) {
@@ -4295,12 +4328,8 @@ void intel_ddi_init(struct drm_i915_private *dev_priv,
"Port %c already claimed\n", port_name(port));
return;
}
- /* FIXME convert HSW/BDW */
- if (!devdata)
- devdata = intel_bios_encoder_data_lookup(dev_priv, port);
-
intel_bios_encoder_sanitize(devdata, port);
if (intel_bios_encoder_supports_dsi(devdata)) {
/* BXT/GLK handled elsewhere, for now at least */
diff --git a/drivers/gpu/drm/i915/display/intel_display.c
b/drivers/gpu/drm/i915/display/intel_display.c
index 7325edb3ca65..0598ac14db05 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -7834,31 +7834,16 @@ static void intel_setup_outputs(struct drm_i915_private
*dev_priv)
if (!HAS_DISPLAY(dev_priv))
return;
- if (DISPLAY_VER(dev_priv) >= 9) {
+ if (HAS_DDI(dev_priv)) {
intel_bios_for_each_encoder(dev_priv, intel_ddi_init);
if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv))
vlv_dsi_init(dev_priv);
- } else if (HAS_DDI(dev_priv)) {
- u32 found;
if (intel_ddi_crt_present(dev_priv))
intel_crt_init(dev_priv);
-
- /* Haswell uses DDI functions to detect digital outputs. */
- found = intel_de_read(dev_priv, DDI_BUF_CTL(PORT_A)) &
DDI_INIT_DISPLAY_DETECTED;
- if (found)
- intel_ddi_init(dev_priv, NULL, PORT_A);
-
- found = intel_de_read(dev_priv, SFUSE_STRAP);
- if (found & SFUSE_STRAP_DDIB_DETECTED)
- intel_ddi_init(dev_priv, NULL, PORT_B);
- if (found & SFUSE_STRAP_DDIC_DETECTED)
- intel_ddi_init(dev_priv, NULL, PORT_C);
- if (found & SFUSE_STRAP_DDID_DETECTED)
- intel_ddi_init(dev_priv, NULL, PORT_D);
} else if (HAS_PCH_SPLIT(dev_priv)) {
int found;
/*
--
2.39.2
