[Intel-gfx] [PATCH v2] drm/i915/ddi: Rely on VBT DDI port info for eDP detection

[Imre Deak]

There is at least one APL based system using port A in DP mode
(connecting to an on-board DP->VGA adaptor). Atm we'll configure port A
unconditionally as eDP which is incorrect in this case. Fix this by
relying on the VBT DDI port 'internal port' flag instead on all ports on
DDI platforms. For now chicken out from using VBT for port A before
GEN9.

v2:
- Move the DDI port info lookup to intel_bios_is_port_edp() (David, Jani)
- Use the DDI port info on all DDI platforms starting for port B.

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Jani Nikula <jani.nikula at intel.com>
Cc: David Weinehall <david.weinehall at linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com> (v1)
Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h   | 1 +
 drivers/gpu/drm/i915/intel_bios.c | 4 ++++
 drivers/gpu/drm/i915/intel_dp.c   | 2 +-
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 77d7a07..1a91409 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1669,6 +1669,7 @@ struct ddi_vbt_port_info {
 	uint8_t supports_dvi:1;
 	uint8_t supports_hdmi:1;
 	uint8_t supports_dp:1;
+	uint8_t supports_edp:1;
 
 	uint8_t alternate_aux_channel;
 	uint8_t alternate_ddc_pin;
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index 1cf2fa6..a359def 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -1161,6 +1161,7 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
 	info->supports_dvi = is_dvi;
 	info->supports_hdmi = is_hdmi;
 	info->supports_dp = is_dp;
+	info->supports_edp = is_edp;
 
 	DRM_DEBUG_KMS("Port %c VBT info: DP:%d HDMI:%d DVI:%d EDP:%d CRT:%d\n",
 		      port_name(port), is_dp, is_hdmi, is_dvi, is_edp, is_crt);
@@ -1664,6 +1665,9 @@ bool intel_bios_is_port_edp(struct drm_i915_private *dev_priv, enum port port)
 	};
 	int i;
 
+	if (HAS_DDI(dev_priv))
+		return dev_priv->vbt.ddi_port_info[port].supports_edp;
+
 	if (!dev_priv->vbt.child_dev_num)
 		return false;
 
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 66b5bc8..746c237 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4975,7 +4975,7 @@ bool intel_dp_is_edp(struct drm_i915_private *dev_priv, enum port port)
 	if (INTEL_GEN(dev_priv) < 5)
 		return false;
 
-	if (port == PORT_A)
+	if (INTEL_GEN(dev_priv) < 9 && port == PORT_A)
 		return true;
 
 	return intel_bios_is_port_edp(dev_priv, port);
-- 
2.5.0