drm/xe/i2c: Wire up reset/postinstall for I2C IRQ

I2C IRQ needs to be routed to SGUnit or PUnit for the devices that support
it. Wire up reset/postinstall handles for I2C IRQ to take care of this.

Signed-off-by: Raag Jadav <raag.jadav@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20251011123509.3233213-3-raag.jadav@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>

4 files changed, 30 insertions, 0 deletions

diff --git a/drivers/gpu/drm/xe/regs/xe_i2c_regs.h b/drivers/gpu/drm/xe/regs/xe_i2c_regs.h
index af781c8e4a80..f2e455e2bfe4 100644
--- a/drivers/gpu/drm/xe/regs/xe_i2c_regs.h
+++ b/drivers/gpu/drm/xe/regs/xe_i2c_regs.h
@@ -14,6 +14,9 @@
 #define REG_SG_REMAP_ADDR_PREFIX	XE_REG(SOC_BASE + 0x0164)
 #define REG_SG_REMAP_ADDR_POSTFIX	XE_REG(SOC_BASE + 0x0168)
 
+#define I2C_BRIDGE_PCICFGCTL		XE_REG(I2C_BRIDGE_OFFSET + 0x200)
+#define   ACPI_INTR_EN			REG_BIT(1)
+
 #define I2C_CONFIG_CMD			XE_REG(I2C_CONFIG_SPACE_OFFSET + PCI_COMMAND)
 #define I2C_CONFIG_PMCSR		XE_REG(I2C_CONFIG_SPACE_OFFSET + 0x84)
 
diff --git a/drivers/gpu/drm/xe/xe_i2c.c b/drivers/gpu/drm/xe/xe_i2c.c
index 25c6b8f3c0bb..0b5452be0c87 100644
--- a/drivers/gpu/drm/xe/xe_i2c.c
+++ b/drivers/gpu/drm/xe/xe_i2c.c
@@ -182,6 +182,26 @@ void xe_i2c_irq_handler(struct xe_device *xe, u32 master_ctl)
 		generic_handle_irq_safe(xe->i2c->adapter_irq);
 }
 
+void xe_i2c_irq_reset(struct xe_device *xe)
+{
+	struct xe_mmio *mmio = xe_root_tile_mmio(xe);
+
+	if (!xe_i2c_irq_present(xe))
+		return;
+
+	xe_mmio_rmw32(mmio, I2C_BRIDGE_PCICFGCTL, ACPI_INTR_EN, 0);
+}
+
+void xe_i2c_irq_postinstall(struct xe_device *xe)
+{
+	struct xe_mmio *mmio = xe_root_tile_mmio(xe);
+
+	if (!xe_i2c_irq_present(xe))
+		return;
+
+	xe_mmio_rmw32(mmio, I2C_BRIDGE_PCICFGCTL, 0, ACPI_INTR_EN);
+}
+
 static int xe_i2c_irq_map(struct irq_domain *h, unsigned int virq,
 			  irq_hw_number_t hw_irq_num)
 {
@@ -339,6 +359,7 @@ int xe_i2c_probe(struct xe_device *xe)
 	if (ret)
 		goto err_remove_irq;
 
+	xe_i2c_irq_postinstall(xe);
 	return devm_add_action_or_reset(drm_dev, xe_i2c_remove, i2c);
 
 err_remove_irq:
diff --git a/drivers/gpu/drm/xe/xe_i2c.h b/drivers/gpu/drm/xe/xe_i2c.h
index ecd5f10358e2..425d8160835f 100644
--- a/drivers/gpu/drm/xe/xe_i2c.h
+++ b/drivers/gpu/drm/xe/xe_i2c.h
@@ -51,12 +51,16 @@ struct xe_i2c {
 int xe_i2c_probe(struct xe_device *xe);
 bool xe_i2c_present(struct xe_device *xe);
 void xe_i2c_irq_handler(struct xe_device *xe, u32 master_ctl);
+void xe_i2c_irq_postinstall(struct xe_device *xe);
+void xe_i2c_irq_reset(struct xe_device *xe);
 void xe_i2c_pm_suspend(struct xe_device *xe);
 void xe_i2c_pm_resume(struct xe_device *xe, bool d3cold);
 #else
 static inline int xe_i2c_probe(struct xe_device *xe) { return 0; }
 static inline bool xe_i2c_present(struct xe_device *xe) { return false; }
 static inline void xe_i2c_irq_handler(struct xe_device *xe, u32 master_ctl) { }
+static inline void xe_i2c_irq_postinstall(struct xe_device *xe) { }
+static inline void xe_i2c_irq_reset(struct xe_device *xe) { }
 static inline void xe_i2c_pm_suspend(struct xe_device *xe) { }
 static inline void xe_i2c_pm_resume(struct xe_device *xe, bool d3cold) { }
 #endif
diff --git a/drivers/gpu/drm/xe/xe_irq.c b/drivers/gpu/drm/xe/xe_irq.c
index 870edaf69388..af519414a429 100644
--- a/drivers/gpu/drm/xe/xe_irq.c
+++ b/drivers/gpu/drm/xe/xe_irq.c
@@ -616,6 +616,7 @@ static void xe_irq_reset(struct xe_device *xe)
 	tile = xe_device_get_root_tile(xe);
 	mask_and_disable(tile, GU_MISC_IRQ_OFFSET);
 	xe_display_irq_reset(xe);
+	xe_i2c_irq_reset(xe);
 
 	/*
 	 * The tile's top-level status register should be the last one
@@ -657,6 +658,7 @@ static void xe_irq_postinstall(struct xe_device *xe)
 	}
 
 	xe_display_irq_postinstall(xe, xe_root_mmio_gt(xe));
+	xe_i2c_irq_postinstall(xe);
 
 	/*
 	 * ASLE backlight operations are reported via GUnit GSE interrupts