[Intel-gfx] [PATCH v2 07/21] drm/i915/mtl: Add gmbus and gpio support

Radhakrishna Sripada
2022-08-18T23:44:08Z

Add tables to map the GMBUS pin pairs to GPIO registers and port to DDC.
From spec we have registers GPIO_CTL[1-5] mapped to native display phys and
GPIO_CTL[9-14] are mapped to TC ports.

BSpec: 49306

Original Author: Brian J Lovin
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
---
drivers/gpu/drm/i915/display/intel_gmbus.c | 17 +++++++++++++++++
drivers/gpu/drm/i915/display/intel_gmbus.h | 1 +
2 files changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_gmbus.c b/drivers/gpu/drm/i915/display/intel_gmbus.c
index a6ba7fb72339..542b8b2654be 100644
--- a/drivers/gpu/drm/i915/display/intel_gmbus.c
+++ b/drivers/gpu/drm/i915/display/intel_gmbus.c
@@ -116,6 +116,20 @@ static const struct gmbus_pin gmbus_pins_dg2[] = {
[GMBUS_PIN_9_TC1_ICP] = { "tc1", GPIOJ },
};

+static const struct gmbus_pin gmbus_pins_mtp[] = {
+ [GMBUS_PIN_1_BXT] = { "dpa", GPIOB },
+ [GMBUS_PIN_2_BXT] = { "dpb", GPIOC },
+ [GMBUS_PIN_3_BXT] = { "dpc", GPIOD },
+ [GMBUS_PIN_4_CNP] = { "dpd", GPIOE },
+ [GMBUS_PIN_5_MTP] = { "dpe", GPIOF },
+ [GMBUS_PIN_9_TC1_ICP] = { "tc1", GPIOJ },
+ [GMBUS_PIN_10_TC2_ICP] = { "tc2", GPIOK },
+ [GMBUS_PIN_11_TC3_ICP] = { "tc3", GPIOL },
+ [GMBUS_PIN_12_TC4_ICP] = { "tc4", GPIOM },
+ [GMBUS_PIN_13_TC5_TGP] = { "tc5", GPION },
+ [GMBUS_PIN_14_TC6_TGP] = { "tc6", GPIOO },
+};
+
static const struct gmbus_pin *get_gmbus_pin(struct drm_i915_private *i915,
unsigned int pin)
{
@@ -128,6 +142,9 @@ static const struct gmbus_pin *get_gmbus_pin(struct drm_i915_private *i915,
} else if (INTEL_PCH_TYPE(i915) >= PCH_DG1) {
pins = gmbus_pins_dg1;
size = ARRAY_SIZE(gmbus_pins_dg1);
+ } else if (INTEL_PCH_TYPE(i915) >= PCH_MTP) {
+ pins = gmbus_pins_mtp;
+ size = ARRAY_SIZE(gmbus_pins_mtp);
} else if (INTEL_PCH_TYPE(i915) >= PCH_ICP) {
pins = gmbus_pins_icp;
size = ARRAY_SIZE(gmbus_pins_icp);
diff --git a/drivers/gpu/drm/i915/display/intel_gmbus.h b/drivers/gpu/drm/i915/display/intel_gmbus.h
index 8edc2e99cf53..20f704bd4e70 100644
--- a/drivers/gpu/drm/i915/display/intel_gmbus.h
+++ b/drivers/gpu/drm/i915/display/intel_gmbus.h
@@ -24,6 +24,7 @@ struct i2c_adapter;
#define GMBUS_PIN_2_BXT 2
#define GMBUS_PIN_3_BXT 3
#define GMBUS_PIN_4_CNP 4
+#define GMBUS_PIN_5_MTP 5
#define GMBUS_PIN_9_TC1_ICP 9
#define GMBUS_PIN_10_TC2_ICP 10
#define GMBUS_PIN_11_TC3_ICP 11
--
2.25.1