[Intel-gfx] [PATCH v3 17/28] drm/i915/dg1: gmbus pin mapping

[Lucas De Marchi]

Add tables to map the GMBUS pin pairs to GPIO registers and port to DDC.

The values for VBT are currently not in BSpec. If we assume the latest
is ICL (like we did for TGL), then the mapping is wrong per VBT we can
currently parse.

>From spec we have registers GPIO_CTL[1-4], so we should not do the 4->9
mapping as in ICL/TGL.

BSpec: 49311, 49945, 20124

Cc: Aditya Swarup <aditya.swarup at intel.com>
Cc: Matt Roper <matthew.d.roper at intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
---
 drivers/gpu/drm/i915/display/intel_bios.c  |  4 +++-
 drivers/gpu/drm/i915/display/intel_gmbus.c | 15 +++++++++++++--
 drivers/gpu/drm/i915/display/intel_hdmi.c  |  9 ++++++++-
 3 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c
index 6593e2c38043..f1fc0c9bf9eb 100644
--- a/drivers/gpu/drm/i915/display/intel_bios.c
+++ b/drivers/gpu/drm/i915/display/intel_bios.c
@@ -1599,7 +1599,9 @@ static u8 map_ddc_pin(struct drm_i915_private *dev_priv, u8 vbt_pin)
 	const u8 *ddc_pin_map;
 	int n_entries;
 
-	if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP) {
+	if (INTEL_PCH_TYPE(dev_priv) >= PCH_DG1) {
+		return vbt_pin;
+	} else if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP) {
 		ddc_pin_map = icp_ddc_pin_map;
 		n_entries = ARRAY_SIZE(icp_ddc_pin_map);
 	} else if (HAS_PCH_CNP(dev_priv)) {
diff --git a/drivers/gpu/drm/i915/display/intel_gmbus.c b/drivers/gpu/drm/i915/display/intel_gmbus.c
index a8d119b6b45c..528e48658340 100644
--- a/drivers/gpu/drm/i915/display/intel_gmbus.c
+++ b/drivers/gpu/drm/i915/display/intel_gmbus.c
@@ -90,11 +90,20 @@ static const struct gmbus_pin gmbus_pins_icp[] = {
 	[GMBUS_PIN_14_TC6_TGP] = { "tc6", GPIOO },
 };
 
+static const struct gmbus_pin gmbus_pins_dg1[] = {
+	[GMBUS_PIN_1_BXT] = { "dpa", GPIOB },
+	[GMBUS_PIN_2_BXT] = { "dpb", GPIOC },
+	[GMBUS_PIN_3_BXT] = { "dpc", GPIOD },
+	[GMBUS_PIN_4_CNP] = { "dpd", GPIOE },
+};
+
 /* pin is expected to be valid */
 static const struct gmbus_pin *get_gmbus_pin(struct drm_i915_private *dev_priv,
 					     unsigned int pin)
 {
-	if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
+	if (INTEL_PCH_TYPE(dev_priv) >= PCH_DG1)
+		return &gmbus_pins_dg1[pin];
+	else if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
 		return &gmbus_pins_icp[pin];
 	else if (HAS_PCH_CNP(dev_priv))
 		return &gmbus_pins_cnp[pin];
@@ -113,7 +122,9 @@ bool intel_gmbus_is_valid_pin(struct drm_i915_private *dev_priv,
 {
 	unsigned int size;
 
-	if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
+	if (INTEL_PCH_TYPE(dev_priv) >= PCH_DG1)
+		size = ARRAY_SIZE(gmbus_pins_dg1);
+	else if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
 		size = ARRAY_SIZE(gmbus_pins_icp);
 	else if (HAS_PCH_CNP(dev_priv))
 		size = ARRAY_SIZE(gmbus_pins_cnp);
diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
index 864a1642e81c..42d62fcc7a91 100644
--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -3113,6 +3113,11 @@ static u8 rkl_port_to_ddc_pin(struct drm_i915_private *dev_priv, enum port port)
 	return GMBUS_PIN_1_BXT + phy;
 }
 
+static u8 dg1_port_to_ddc_pin(struct drm_i915_private *dev_priv, enum port port)
+{
+	return intel_port_to_phy(dev_priv, port) + 1;
+}
+
 static u8 g4x_port_to_ddc_pin(struct drm_i915_private *dev_priv,
 			      enum port port)
 {
@@ -3150,7 +3155,9 @@ static u8 intel_hdmi_ddc_pin(struct intel_encoder *encoder)
 		return ddc_pin;
 	}
 
-	if (IS_ROCKETLAKE(dev_priv))
+	if (INTEL_PCH_TYPE(dev_priv) >= PCH_DG1)
+		ddc_pin = dg1_port_to_ddc_pin(dev_priv, port);
+	else if (IS_ROCKETLAKE(dev_priv))
 		ddc_pin = rkl_port_to_ddc_pin(dev_priv, port);
 	else if (HAS_PCH_MCC(dev_priv))
 		ddc_pin = mcc_port_to_ddc_pin(dev_priv, port);
-- 
2.26.2