[PATCH v2 0/4] drm/xe: i2c support

[PATCH v2 0/4] drm/xe: i2c support

[Heikki Krogerus]

Hi,

Changed since v1:
- Now rebased on top of drm-tip.
- No longer ignoring errors from xe_i2c_probe().
- Cleanups pointed out by Lucas.

I've also included followup patches from Raag and Riana to this
series.

Original cover letter:

Some of the future GPUs will provide access to the on-board Synopsys
DesignWare I2C host adapter. The i2c is used to connect various
microcontrollers. The initially supported microcontroller unit is
called Add-In Management Controller (AMC).

Thanks,

Heikki Krogerus (2):
  i2c: designware: Add quirk for Intel Xe
  drm/xe: Support for I2C attached MCUs

Raag Jadav (1):
  drm/xe/pm: Wire up suspend/resume for I2C controller

Riana Tauro (1):
  drm/xe/xe_i2c: Add support for i2c in survivability mode

 drivers/gpu/drm/xe/Makefile                 |   1 +
 drivers/gpu/drm/xe/regs/xe_i2c_regs.h       |  20 ++
 drivers/gpu/drm/xe/regs/xe_irq_regs.h       |   1 +
 drivers/gpu/drm/xe/regs/xe_pmt.h            |   2 +-
 drivers/gpu/drm/xe/regs/xe_regs.h           |   2 +
 drivers/gpu/drm/xe/xe_device.c              |   5 +
 drivers/gpu/drm/xe/xe_device_types.h        |   4 +
 drivers/gpu/drm/xe/xe_i2c.c                 | 299 ++++++++++++++++++++
 drivers/gpu/drm/xe/xe_i2c.h                 |  62 ++++
 drivers/gpu/drm/xe/xe_irq.c                 |   2 +
 drivers/gpu/drm/xe/xe_pm.c                  |   9 +
 drivers/gpu/drm/xe/xe_survivability_mode.c  |  23 +-
 drivers/i2c/busses/i2c-designware-platdrv.c |  18 +-
 13 files changed, 433 insertions(+), 15 deletions(-)
 create mode 100644 drivers/gpu/drm/xe/regs/xe_i2c_regs.h
 create mode 100644 drivers/gpu/drm/xe/xe_i2c.c
 create mode 100644 drivers/gpu/drm/xe/xe_i2c.h

-- 
2.47.2

[PATCH v2 1/4] i2c: designware: Add quirk for Intel Xe

[Heikki Krogerus]

The regmap is coming from the parent also in case of Xe
GPUs. Reusing the Wangxun quirk for that.

Originally-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
 drivers/i2c/busses/i2c-designware-platdrv.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 879719e91df2..a35e4c64a1d4 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -101,7 +101,7 @@ static int bt1_i2c_request_regs(struct dw_i2c_dev *dev)
 }
 #endif
 
-static int txgbe_i2c_request_regs(struct dw_i2c_dev *dev)
+static int dw_i2c_get_parent_regmap(struct dw_i2c_dev *dev)
 {
 	dev->map = dev_get_regmap(dev->dev->parent, NULL);
 	if (!dev->map)
@@ -123,12 +123,15 @@ static int dw_i2c_plat_request_regs(struct dw_i2c_dev *dev)
 	struct platform_device *pdev = to_platform_device(dev->dev);
 	int ret;
 
+	if (device_is_compatible(dev->dev, "intel,xe-i2c"))
+		return dw_i2c_get_parent_regmap(dev);
+
 	switch (dev->flags & MODEL_MASK) {
 	case MODEL_BAIKAL_BT1:
 		ret = bt1_i2c_request_regs(dev);
 		break;
 	case MODEL_WANGXUN_SP:
-		ret = txgbe_i2c_request_regs(dev);
+		ret = dw_i2c_get_parent_regmap(dev);
 		break;
 	default:
 		dev->base = devm_platform_ioremap_resource(pdev, 0);
@@ -205,25 +208,28 @@ static void i2c_dw_remove_lock_support(struct dw_i2c_dev *dev)
 
 static int dw_i2c_plat_probe(struct platform_device *pdev)
 {
+	u32 flags = (uintptr_t)device_get_match_data(&pdev->dev);
 	struct device *device = &pdev->dev;
 	struct i2c_adapter *adap;
 	struct dw_i2c_dev *dev;
 	int irq, ret;
 
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
+	irq = platform_get_irq_optional(pdev, 0);
+	if (irq == -ENXIO)
+		flags |= ACCESS_POLLING;
+	else if (irq < 0)
 		return irq;
 
 	dev = devm_kzalloc(device, sizeof(*dev), GFP_KERNEL);
 	if (!dev)
 		return -ENOMEM;
 
-	dev->flags = (uintptr_t)device_get_match_data(device);
 	if (device_property_present(device, "wx,i2c-snps-model"))
-		dev->flags = MODEL_WANGXUN_SP | ACCESS_POLLING;
+		flags = MODEL_WANGXUN_SP | ACCESS_POLLING;
 
 	dev->dev = device;
 	dev->irq = irq;
+	dev->flags = flags;
 	platform_set_drvdata(pdev, dev);
 
 	ret = dw_i2c_plat_request_regs(dev);
-- 
2.47.2

Re: [PATCH v2 1/4] i2c: designware: Add quirk for Intel Xe

[Jarkko Nikula]

On 6/10/25 1:03 PM, Heikki Krogerus wrote:
> The regmap is coming from the parent also in case of Xe
> GPUs. Reusing the Wangxun quirk for that.
> 
> Originally-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
> Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> ---
>   drivers/i2c/busses/i2c-designware-platdrv.c | 18 ++++++++++++------
>   1 file changed, 12 insertions(+), 6 deletions(-)
> 
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>

[PATCH v2 2/4] drm/xe: Support for I2C attached MCUs

[Heikki Krogerus]

Adding adaption/glue layer where the I2C host adapter
(Synopsys DesignWare I2C adapter) and the I2C clients (the
microcontroller units) are enumerated.

The microcontroller units (MCU) that are attached to the GPU
depend on the OEM. The initially supported MCU will be the
Add-In Management Controller (AMC).

Originally-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
 drivers/gpu/drm/xe/Makefile           |   1 +
 drivers/gpu/drm/xe/regs/xe_i2c_regs.h |  15 ++
 drivers/gpu/drm/xe/regs/xe_irq_regs.h |   1 +
 drivers/gpu/drm/xe/regs/xe_pmt.h      |   2 +-
 drivers/gpu/drm/xe/regs/xe_regs.h     |   2 +
 drivers/gpu/drm/xe/xe_device.c        |   5 +
 drivers/gpu/drm/xe/xe_device_types.h  |   4 +
 drivers/gpu/drm/xe/xe_i2c.c           | 270 ++++++++++++++++++++++++++
 drivers/gpu/drm/xe/xe_i2c.h           |  58 ++++++
 drivers/gpu/drm/xe/xe_irq.c           |   2 +
 10 files changed, 359 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/drm/xe/regs/xe_i2c_regs.h
 create mode 100644 drivers/gpu/drm/xe/xe_i2c.c
 create mode 100644 drivers/gpu/drm/xe/xe_i2c.h

diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
index f5f5775acdc0..293552fc5aaf 100644
--- a/drivers/gpu/drm/xe/Makefile
+++ b/drivers/gpu/drm/xe/Makefile
@@ -124,6 +124,7 @@ xe-y += xe_bb.o \
 	xe_wait_user_fence.o \
 	xe_wopcm.o
 
+xe-$(CONFIG_I2C)	+= xe_i2c.o
 xe-$(CONFIG_HMM_MIRROR) += xe_hmm.o
 xe-$(CONFIG_DRM_XE_GPUSVM) += xe_svm.o
 
diff --git a/drivers/gpu/drm/xe/regs/xe_i2c_regs.h b/drivers/gpu/drm/xe/regs/xe_i2c_regs.h
new file mode 100644
index 000000000000..fa7223e6ce9e
--- /dev/null
+++ b/drivers/gpu/drm/xe/regs/xe_i2c_regs.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _XE_I2C_REGS_H_
+#define _XE_I2C_REGS_H_
+
+#include "xe_reg_defs.h"
+#include "xe_regs.h"
+
+#define I2C_CONFIG_SPACE_OFFSET		(SOC_BASE + 0xf6000)
+#define I2C_MEM_SPACE_OFFSET		(SOC_BASE + 0xf7400)
+#define I2C_BRIDGE_OFFSET		(SOC_BASE + 0xd9000)
+
+#define CLIENT_DISC_COOKIE		XE_REG(SOC_BASE + 0x0164)
+#define CLIENT_DISC_ADDRESS		XE_REG(SOC_BASE + 0x0168)
+
+#endif /* _XE_I2C_REGS_H_ */
diff --git a/drivers/gpu/drm/xe/regs/xe_irq_regs.h b/drivers/gpu/drm/xe/regs/xe_irq_regs.h
index f0ecfcac4003..13635e4331d4 100644
--- a/drivers/gpu/drm/xe/regs/xe_irq_regs.h
+++ b/drivers/gpu/drm/xe/regs/xe_irq_regs.h
@@ -19,6 +19,7 @@
 #define   MASTER_IRQ				REG_BIT(31)
 #define   GU_MISC_IRQ				REG_BIT(29)
 #define   DISPLAY_IRQ				REG_BIT(16)
+#define   I2C_IRQ				REG_BIT(12)
 #define   GT_DW_IRQ(x)				REG_BIT(x)
 
 /*
diff --git a/drivers/gpu/drm/xe/regs/xe_pmt.h b/drivers/gpu/drm/xe/regs/xe_pmt.h
index b0efd9b48d1e..2995d72c3f78 100644
--- a/drivers/gpu/drm/xe/regs/xe_pmt.h
+++ b/drivers/gpu/drm/xe/regs/xe_pmt.h
@@ -5,7 +5,7 @@
 #ifndef _XE_PMT_H_
 #define _XE_PMT_H_
 
-#define SOC_BASE			0x280000
+#include "xe_regs.h"
 
 #define BMG_PMT_BASE_OFFSET		0xDB000
 #define BMG_DISCOVERY_OFFSET		(SOC_BASE + BMG_PMT_BASE_OFFSET)
diff --git a/drivers/gpu/drm/xe/regs/xe_regs.h b/drivers/gpu/drm/xe/regs/xe_regs.h
index 3abb17d2ca33..1926b4044314 100644
--- a/drivers/gpu/drm/xe/regs/xe_regs.h
+++ b/drivers/gpu/drm/xe/regs/xe_regs.h
@@ -7,6 +7,8 @@
 
 #include "regs/xe_reg_defs.h"
 
+#define SOC_BASE				0x280000
+
 #define GU_CNTL_PROTECTED			XE_REG(0x10100C)
 #define   DRIVERINT_FLR_DIS			REG_BIT(31)
 
diff --git a/drivers/gpu/drm/xe/xe_device.c b/drivers/gpu/drm/xe/xe_device.c
index 7e87344943cd..ca098ed532b5 100644
--- a/drivers/gpu/drm/xe/xe_device.c
+++ b/drivers/gpu/drm/xe/xe_device.c
@@ -42,6 +42,7 @@
 #include "xe_guc.h"
 #include "xe_hw_engine_group.h"
 #include "xe_hwmon.h"
+#include "xe_i2c.h"
 #include "xe_irq.h"
 #include "xe_memirq.h"
 #include "xe_mmio.h"
@@ -921,6 +922,10 @@ int xe_device_probe(struct xe_device *xe)
 	if (err)
 		goto err_unregister_display;
 
+	err = xe_i2c_probe(xe);
+	if (err)
+		goto err_unregister_display;
+
 	for_each_gt(gt, xe, id)
 		xe_gt_sanitize_freq(gt);
 
diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h
index ac27389ccb8b..8f3c5ea58034 100644
--- a/drivers/gpu/drm/xe/xe_device_types.h
+++ b/drivers/gpu/drm/xe/xe_device_types.h
@@ -33,6 +33,7 @@
 struct dram_info;
 struct intel_display;
 struct xe_ggtt;
+struct xe_i2c;
 struct xe_pat_ops;
 struct xe_pxp;
 
@@ -573,6 +574,9 @@ struct xe_device {
 	/** @pmu: performance monitoring unit */
 	struct xe_pmu pmu;
 
+	/** @i2c: I2C host controller */
+	struct xe_i2c *i2c;
+
 	/** @atomic_svm_timeslice_ms: Atomic SVM fault timeslice MS */
 	u32 atomic_svm_timeslice_ms;
 
diff --git a/drivers/gpu/drm/xe/xe_i2c.c b/drivers/gpu/drm/xe/xe_i2c.c
new file mode 100644
index 000000000000..3d649602ede8
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_i2c.c
@@ -0,0 +1,270 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Intel Xe I2C attached Microcontroller Units (MCU)
+ *
+ * Copyright (C) 2025 Intel Corporation.
+ */
+
+#include <linux/array_size.h>
+#include <linux/container_of.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/ioport.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/notifier.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/sprintf.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+
+#include "regs/xe_i2c_regs.h"
+#include "regs/xe_irq_regs.h"
+
+#include "xe_device.h"
+#include "xe_device_types.h"
+#include "xe_i2c.h"
+#include "xe_mmio.h"
+#include "xe_platform_types.h"
+
+/* Synopsys DesignWare I2C Host Adapter */
+static const char adapter_name[] = "i2c_designware";
+
+static const struct property_entry xe_i2c_adapter_properties[] = {
+	PROPERTY_ENTRY_STRING("compatible", "intel,xe-i2c"),
+	PROPERTY_ENTRY_U32("clock-frequency", I2C_MAX_FAST_MODE_PLUS_FREQ),
+	{ }
+};
+
+static inline void xe_i2c_read_endpoint(struct xe_mmio *mmio, void *ep)
+{
+	u32 *val = ep;
+
+	val[0] = xe_mmio_read32(mmio, CLIENT_DISC_COOKIE);
+	val[1] = xe_mmio_read32(mmio, CLIENT_DISC_ADDRESS);
+}
+
+static void xe_i2c_client_work(struct work_struct *work)
+{
+	struct xe_i2c *i2c = container_of(work, struct xe_i2c, work);
+	struct i2c_board_info info = {
+		.type	= "amc",
+		.flags	= I2C_CLIENT_HOST_NOTIFY,
+		.addr	= i2c->ep.addr[1],
+	};
+
+	i2c->client[0] = i2c_new_client_device(i2c->adapter, &info);
+}
+
+static int xe_i2c_notifier(struct notifier_block *nb, unsigned long action, void *data)
+{
+	struct xe_i2c *i2c = container_of(nb, struct xe_i2c, bus_notifier);
+	struct i2c_adapter *adapter = i2c_verify_adapter(data);
+	struct device *dev = data;
+
+	if (action == BUS_NOTIFY_ADD_DEVICE &&
+	    adapter && dev->parent == &i2c->pdev->dev) {
+		i2c->adapter = adapter;
+		schedule_work(&i2c->work);
+		return NOTIFY_OK;
+	}
+
+	return NOTIFY_DONE;
+}
+
+static int xe_i2c_register_adapter(struct xe_i2c *i2c)
+{
+	struct pci_dev *pci = to_pci_dev(i2c->drm_dev);
+	struct platform_device *pdev;
+	struct fwnode_handle *fwnode;
+	int ret;
+
+	fwnode = fwnode_create_software_node(xe_i2c_adapter_properties, NULL);
+	if (!fwnode)
+		return -ENOMEM;
+
+	/*
+	 * Not using platform_device_register_full() here because we don't have
+	 * a handle to the platform_device before it returns. xe_i2c_notifier()
+	 * uses that handle, but it may be called before
+	 * platform_device_register_full() is done.
+	 */
+	pdev = platform_device_alloc(adapter_name, pci_dev_id(pci));
+	if (!pdev) {
+		ret = -ENOMEM;
+		goto err_fwnode_remove;
+	}
+
+	if (i2c->adapter_irq) {
+		struct resource	res = { };
+
+		res.start = i2c->adapter_irq;
+		res.name = "xe_i2c";
+		res.flags = IORESOURCE_IRQ;
+
+		ret = platform_device_add_resources(pdev, &res, 1);
+		if (ret)
+			goto err_pdev_put;
+	}
+
+	pdev->dev.parent = i2c->drm_dev;
+	pdev->dev.fwnode = fwnode;
+	i2c->adapter_node = fwnode;
+	i2c->pdev = pdev;
+
+	ret = platform_device_add(pdev);
+	if (ret)
+		goto err_pdev_put;
+
+	return 0;
+
+err_pdev_put:
+	platform_device_put(pdev);
+err_fwnode_remove:
+	fwnode_remove_software_node(fwnode);
+
+	return ret;
+}
+
+static void xe_i2c_unregister_adapter(struct xe_i2c *i2c)
+{
+	platform_device_unregister(i2c->pdev);
+	fwnode_remove_software_node(i2c->adapter_node);
+}
+
+void xe_i2c_irq_handler(struct xe_device *xe, u32 master_ctl)
+{
+	if (!xe->i2c || !xe->i2c->adapter_irq)
+		return;
+
+	if (master_ctl & I2C_IRQ)
+		generic_handle_irq_safe(xe->i2c->adapter_irq);
+}
+
+static int xe_i2c_irq_map(struct irq_domain *h, unsigned int virq,
+			  irq_hw_number_t hw_irq_num)
+{
+	irq_set_chip_and_handler(virq, &dummy_irq_chip, handle_simple_irq);
+	return 0;
+}
+
+static const struct irq_domain_ops xe_i2c_irq_ops = {
+	.map = xe_i2c_irq_map,
+};
+
+static int xe_i2c_create_irq(struct xe_i2c *i2c)
+{
+	struct irq_domain *domain;
+
+	if (!(i2c->ep.capabilities & XE_I2C_EP_CAP_IRQ))
+		return 0;
+
+	domain = irq_domain_create_linear(dev_fwnode(i2c->drm_dev), 1, &xe_i2c_irq_ops, NULL);
+	if (!domain)
+		return -ENOMEM;
+
+	i2c->adapter_irq = irq_create_mapping(domain, 0);
+	i2c->irqdomain = domain;
+
+	return 0;
+}
+
+static void xe_i2c_remove_irq(struct xe_i2c *i2c)
+{
+	if (i2c->irqdomain) {
+		irq_dispose_mapping(i2c->adapter_irq);
+		irq_domain_remove(i2c->irqdomain);
+	}
+}
+
+static int xe_i2c_read(void *context, unsigned int reg, unsigned int *val)
+{
+	struct xe_i2c *i2c = context;
+
+	*val = xe_mmio_read32(i2c->mmio, XE_REG(reg + I2C_MEM_SPACE_OFFSET));
+
+	return 0;
+}
+
+static int xe_i2c_write(void *context, unsigned int reg, unsigned int val)
+{
+	struct xe_i2c *i2c = context;
+
+	xe_mmio_write32(i2c->mmio, XE_REG(reg + I2C_MEM_SPACE_OFFSET), val);
+
+	return 0;
+}
+
+static const struct regmap_config i2c_regmap_config = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_read = xe_i2c_read,
+	.reg_write = xe_i2c_write,
+	.fast_io = true,
+};
+
+static void xe_i2c_remove(void *data)
+{
+	struct xe_i2c *i2c = data;
+	int i;
+
+	for (i = 0; i < XE_I2C_MAX_CLIENTS; i++)
+		i2c_unregister_device(i2c->client[i]);
+
+	bus_unregister_notifier(&i2c_bus_type, &i2c->bus_notifier);
+	xe_i2c_unregister_adapter(i2c);
+	xe_i2c_remove_irq(i2c);
+}
+
+int xe_i2c_probe(struct xe_device *xe)
+{
+	struct xe_i2c_endpoint ep;
+	struct regmap *regmap;
+	struct xe_i2c *i2c;
+	int ret;
+
+	xe_i2c_read_endpoint(xe_root_tile_mmio(xe), &ep);
+	if (ep.cookie != XE_I2C_EP_COOKIE_DEVICE)
+		return 0;
+
+	i2c = devm_kzalloc(xe->drm.dev, sizeof(*i2c), GFP_KERNEL);
+	if (!i2c)
+		return -ENOMEM;
+
+	INIT_WORK(&i2c->work, xe_i2c_client_work);
+	i2c->mmio = xe_root_tile_mmio(xe);
+	i2c->drm_dev = xe->drm.dev;
+	i2c->ep = ep;
+
+	regmap = devm_regmap_init(i2c->drm_dev, NULL, i2c, &i2c_regmap_config);
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
+
+	i2c->bus_notifier.notifier_call = xe_i2c_notifier;
+	ret = bus_register_notifier(&i2c_bus_type, &i2c->bus_notifier);
+	if (ret)
+		return ret;
+
+	ret = xe_i2c_create_irq(i2c);
+	if (ret)
+		goto err_unregister_notifier;
+
+	ret = xe_i2c_register_adapter(i2c);
+	if (ret)
+		goto err_remove_irq;
+
+	return devm_add_action_or_reset(i2c->drm_dev, xe_i2c_remove, i2c);
+
+err_remove_irq:
+	xe_i2c_remove_irq(i2c);
+
+err_unregister_notifier:
+	bus_unregister_notifier(&i2c_bus_type, &i2c->bus_notifier);
+
+	return ret;
+}
diff --git a/drivers/gpu/drm/xe/xe_i2c.h b/drivers/gpu/drm/xe/xe_i2c.h
new file mode 100644
index 000000000000..e88845be61b4
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_i2c.h
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _XE_I2C_H_
+#define _XE_I2C_H_
+
+#include <linux/bits.h>
+#include <linux/notifier.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+
+struct device;
+struct fwnode_handle;
+struct i2c_adapter;
+struct i2c_client;
+struct irq_domain;
+struct platform_device;
+struct xe_device;
+struct xe_mmio;
+
+#define XE_I2C_MAX_CLIENTS		3
+
+#define XE_I2C_EP_COOKIE_DEVICE		0xde
+
+/* Endpoint Capabilities */
+#define XE_I2C_EP_CAP_IRQ		BIT(0)
+
+struct xe_i2c_endpoint {
+	u8 cookie;
+	u8 capabilities;
+	u16 addr[XE_I2C_MAX_CLIENTS];
+};
+
+struct xe_i2c {
+	struct fwnode_handle *adapter_node;
+	struct platform_device *pdev;
+	struct i2c_adapter *adapter;
+	struct i2c_client *client[XE_I2C_MAX_CLIENTS];
+
+	struct notifier_block bus_notifier;
+	struct work_struct work;
+
+	struct irq_domain *irqdomain;
+	int adapter_irq;
+
+	struct xe_i2c_endpoint ep;
+	struct device *drm_dev;
+
+	struct xe_mmio *mmio;
+};
+
+#if IS_ENABLED(CONFIG_I2C)
+int xe_i2c_probe(struct xe_device *xe);
+void xe_i2c_irq_handler(struct xe_device *xe, u32 master_ctl);
+#else
+static inline int xe_i2c_probe(struct xe_device *xe) { return 0; }
+static inline void xe_i2c_irq_handler(struct xe_device *xe, u32 master_ctl) { }
+#endif
+
+#endif
diff --git a/drivers/gpu/drm/xe/xe_irq.c b/drivers/gpu/drm/xe/xe_irq.c
index 5362d3174b06..c43e62dc692e 100644
--- a/drivers/gpu/drm/xe/xe_irq.c
+++ b/drivers/gpu/drm/xe/xe_irq.c
@@ -18,6 +18,7 @@
 #include "xe_gt.h"
 #include "xe_guc.h"
 #include "xe_hw_engine.h"
+#include "xe_i2c.h"
 #include "xe_memirq.h"
 #include "xe_mmio.h"
 #include "xe_pxp.h"
@@ -476,6 +477,7 @@ static irqreturn_t dg1_irq_handler(int irq, void *arg)
 			if (xe->info.has_heci_cscfi)
 				xe_heci_csc_irq_handler(xe, master_ctl);
 			xe_display_irq_handler(xe, master_ctl);
+			xe_i2c_irq_handler(xe, master_ctl);
 			gu_misc_iir = gu_misc_irq_ack(xe, master_ctl);
 		}
 	}
-- 
2.47.2

[PATCH v2 3/4] drm/xe/pm: Wire up suspend/resume for I2C controller

[Heikki Krogerus]

From: Raag Jadav <raag.jadav@intel.com>

Wire up suspend/resume handles for I2C controller to match its power
state with SGUnit.

Signed-off-by: Raag Jadav <raag.jadav@intel.com>
Reviewed-by: Karthik Poosa <karthik.poosa@intel.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
 drivers/gpu/drm/xe/regs/xe_i2c_regs.h |  5 +++++
 drivers/gpu/drm/xe/xe_i2c.c           | 29 +++++++++++++++++++++++++++
 drivers/gpu/drm/xe/xe_i2c.h           |  4 ++++
 drivers/gpu/drm/xe/xe_pm.c            |  9 +++++++++
 4 files changed, 47 insertions(+)

diff --git a/drivers/gpu/drm/xe/regs/xe_i2c_regs.h b/drivers/gpu/drm/xe/regs/xe_i2c_regs.h
index fa7223e6ce9e..27f9935fd8fd 100644
--- a/drivers/gpu/drm/xe/regs/xe_i2c_regs.h
+++ b/drivers/gpu/drm/xe/regs/xe_i2c_regs.h
@@ -2,6 +2,8 @@
 #ifndef _XE_I2C_REGS_H_
 #define _XE_I2C_REGS_H_
 
+#include <linux/pci_regs.h>
+
 #include "xe_reg_defs.h"
 #include "xe_regs.h"
 
@@ -12,4 +14,7 @@
 #define CLIENT_DISC_COOKIE		XE_REG(SOC_BASE + 0x0164)
 #define CLIENT_DISC_ADDRESS		XE_REG(SOC_BASE + 0x0168)
 
+#define I2C_CONFIG_CMD			XE_REG(I2C_CONFIG_SPACE_OFFSET + PCI_COMMAND)
+#define I2C_CONFIG_PMCSR		XE_REG(I2C_CONFIG_SPACE_OFFSET + 0x84)
+
 #endif /* _XE_I2C_REGS_H_ */
diff --git a/drivers/gpu/drm/xe/xe_i2c.c b/drivers/gpu/drm/xe/xe_i2c.c
index 3d649602ede8..59bdf28717bc 100644
--- a/drivers/gpu/drm/xe/xe_i2c.c
+++ b/drivers/gpu/drm/xe/xe_i2c.c
@@ -208,6 +208,31 @@ static const struct regmap_config i2c_regmap_config = {
 	.fast_io = true,
 };
 
+void xe_i2c_pm_suspend(struct xe_device *xe)
+{
+	struct xe_mmio *mmio = xe_root_tile_mmio(xe);
+
+	if (!xe->i2c || xe->i2c->ep.cookie != XE_I2C_EP_COOKIE_DEVICE)
+		return;
+
+	xe_mmio_rmw32(mmio, I2C_CONFIG_PMCSR, PCI_PM_CTRL_STATE_MASK, PCI_D3hot);
+	drm_dbg(&xe->drm, "pmcsr: 0x%08x\n", xe_mmio_read32(mmio, I2C_CONFIG_PMCSR));
+}
+
+void xe_i2c_pm_resume(struct xe_device *xe, bool d3cold)
+{
+	struct xe_mmio *mmio = xe_root_tile_mmio(xe);
+
+	if (!xe->i2c || xe->i2c->ep.cookie != XE_I2C_EP_COOKIE_DEVICE)
+		return;
+
+	if (d3cold)
+		xe_mmio_rmw32(mmio, I2C_CONFIG_CMD, 0, PCI_COMMAND_MEMORY);
+
+	xe_mmio_rmw32(mmio, I2C_CONFIG_PMCSR, PCI_PM_CTRL_STATE_MASK, PCI_D0);
+	drm_dbg(&xe->drm, "pmcsr: 0x%08x\n", xe_mmio_read32(mmio, I2C_CONFIG_PMCSR));
+}
+
 static void xe_i2c_remove(void *data)
 {
 	struct xe_i2c *i2c = data;
@@ -240,6 +265,10 @@ int xe_i2c_probe(struct xe_device *xe)
 	i2c->mmio = xe_root_tile_mmio(xe);
 	i2c->drm_dev = xe->drm.dev;
 	i2c->ep = ep;
+	xe->i2c = i2c;
+
+	/* PCI PM isn't aware of this device, bring it up and match it with SGUnit state. */
+	xe_i2c_pm_resume(xe, true);
 
 	regmap = devm_regmap_init(i2c->drm_dev, NULL, i2c, &i2c_regmap_config);
 	if (IS_ERR(regmap))
diff --git a/drivers/gpu/drm/xe/xe_i2c.h b/drivers/gpu/drm/xe/xe_i2c.h
index e88845be61b4..3b1208416bde 100644
--- a/drivers/gpu/drm/xe/xe_i2c.h
+++ b/drivers/gpu/drm/xe/xe_i2c.h
@@ -50,9 +50,13 @@ struct xe_i2c {
 #if IS_ENABLED(CONFIG_I2C)
 int xe_i2c_probe(struct xe_device *xe);
 void xe_i2c_irq_handler(struct xe_device *xe, u32 master_ctl);
+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 void xe_i2c_irq_handler(struct xe_device *xe, u32 master_ctl) { }
+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
 
 #endif
diff --git a/drivers/gpu/drm/xe/xe_pm.c b/drivers/gpu/drm/xe/xe_pm.c
index 26e95460af87..46471e166b96 100644
--- a/drivers/gpu/drm/xe/xe_pm.c
+++ b/drivers/gpu/drm/xe/xe_pm.c
@@ -19,6 +19,7 @@
 #include "xe_ggtt.h"
 #include "xe_gt.h"
 #include "xe_guc.h"
+#include "xe_i2c.h"
 #include "xe_irq.h"
 #include "xe_pcode.h"
 #include "xe_pxp.h"
@@ -146,6 +147,8 @@ int xe_pm_suspend(struct xe_device *xe)
 
 	xe_display_pm_suspend_late(xe);
 
+	xe_i2c_pm_suspend(xe);
+
 	drm_dbg(&xe->drm, "Device suspended\n");
 	return 0;
 
@@ -191,6 +194,8 @@ int xe_pm_resume(struct xe_device *xe)
 	if (err)
 		goto err;
 
+	xe_i2c_pm_resume(xe, xe->d3cold.allowed);
+
 	xe_irq_resume(xe);
 
 	for_each_gt(gt, xe, id)
@@ -484,6 +489,8 @@ int xe_pm_runtime_suspend(struct xe_device *xe)
 
 	xe_display_pm_runtime_suspend_late(xe);
 
+	xe_i2c_pm_suspend(xe);
+
 	xe_rpm_lockmap_release(xe);
 	xe_pm_write_callback_task(xe, NULL);
 	return 0;
@@ -531,6 +538,8 @@ int xe_pm_runtime_resume(struct xe_device *xe)
 			goto out;
 	}
 
+	xe_i2c_pm_resume(xe, xe->d3cold.allowed);
+
 	xe_irq_resume(xe);
 
 	for_each_gt(gt, xe, id)
-- 
2.47.2

[PATCH v2 4/4] drm/xe/xe_i2c: Add support for i2c in survivability mode

[Heikki Krogerus]

From: Riana Tauro <riana.tauro@intel.com>

Initialize i2c in survivability mode to allow firmware
update of Add-In Management Controller (AMC) in survivability mode

Signed-off-by: Riana Tauro <riana.tauro@intel.com>
Reviewed-by: Raag Jadav <raag.jadav@intel.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
 drivers/gpu/drm/xe/xe_survivability_mode.c | 23 ++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_survivability_mode.c b/drivers/gpu/drm/xe/xe_survivability_mode.c
index 1f710b3fc599..3800cc855c22 100644
--- a/drivers/gpu/drm/xe/xe_survivability_mode.c
+++ b/drivers/gpu/drm/xe/xe_survivability_mode.c
@@ -14,6 +14,7 @@
 #include "xe_device.h"
 #include "xe_gt.h"
 #include "xe_heci_gsc.h"
+#include "xe_i2c.h"
 #include "xe_mmio.h"
 #include "xe_pcode_api.h"
 #include "xe_vsec.h"
@@ -173,20 +174,26 @@ static int enable_survivability_mode(struct pci_dev *pdev)
 	survivability->mode = true;
 
 	ret = xe_heci_gsc_init(xe);
-	if (ret) {
-		/*
-		 * But if it fails, device can't enter survivability
-		 * so move it back for correct error handling
-		 */
-		survivability->mode = false;
-		return ret;
-	}
+	if (ret)
+		goto err;
 
 	xe_vsec_init(xe);
 
+	ret = xe_i2c_probe(xe);
+	if (ret)
+		goto err;
+
 	dev_err(dev, "In Survivability Mode\n");
 
 	return 0;
+
+err:
+	/*
+	 * But if it fails, device can't enter survivability
+	 * so move it back for correct error handling
+	 */
+	survivability->mode = false;
+	return ret;
 }
 
 /**
-- 
2.47.2

✓ CI.Patch_applied: success for drm/xe: i2c support (rev2)

[Patchwork]

== Series Details ==

Series: drm/xe: i2c support (rev2)
URL   : https://patchwork.freedesktop.org/series/149699/
State : success

== Summary ==

=== Applying kernel patches on branch 'drm-tip' with base: ===
Base commit: 52ecbb6a6878 drm-tip: 2025y-06m-09d-17h-17m-28s UTC integration manifest
=== git am output follows ===
Applying: i2c: designware: Add quirk for Intel Xe
Applying: drm/xe: Support for I2C attached MCUs
Applying: drm/xe/pm: Wire up suspend/resume for I2C controller
Applying: drm/xe/xe_i2c: Add support for i2c in survivability mode

✗ CI.checkpatch: warning for drm/xe: i2c support (rev2)

[Patchwork]

== Series Details ==

Series: drm/xe: i2c support (rev2)
URL   : https://patchwork.freedesktop.org/series/149699/
State : warning

== Summary ==

+ KERNEL=/kernel
+ git clone https://gitlab.freedesktop.org/drm/maintainer-tools mt
Cloning into 'mt'...
warning: redirecting to https://gitlab.freedesktop.org/drm/maintainer-tools.git/
+ git -C mt rev-list -n1 origin/master
202708c00696422fd217223bb679a353a5936e23
+ cd /kernel
+ git config --global --add safe.directory /kernel
+ git log -n1
commit 98a024d58c0836d03aff9e5ae93e1fdfadcce2da
Author: Riana Tauro <riana.tauro@intel.com>
Date:   Tue Jun 10 13:03:10 2025 +0300

    drm/xe/xe_i2c: Add support for i2c in survivability mode
    
    Initialize i2c in survivability mode to allow firmware
    update of Add-In Management Controller (AMC) in survivability mode
    
    Signed-off-by: Riana Tauro <riana.tauro@intel.com>
    Reviewed-by: Raag Jadav <raag.jadav@intel.com>
    Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+ /mt/dim checkpatch 52ecbb6a68785860c776b29f58792d9807243979 drm-intel
2dd1145b5a4d i2c: designware: Add quirk for Intel Xe
-:9: WARNING:BAD_SIGN_OFF: Non-standard signature: Originally-by:
#9: 
Originally-by: Michael J. Ruhl <michael.j.ruhl@intel.com>

total: 0 errors, 1 warnings, 0 checks, 56 lines checked
83e4529c6351 drm/xe: Support for I2C attached MCUs
-:14: WARNING:BAD_SIGN_OFF: Non-standard signature: Originally-by:
#14: 
Originally-by: Michael J. Ruhl <michael.j.ruhl@intel.com>

-:30: WARNING:FILE_PATH_CHANGES: added, moved or deleted file(s), does MAINTAINERS need updating?
#30: 
new file mode 100644

total: 0 errors, 2 warnings, 0 checks, 420 lines checked
4cf3cdd83410 drm/xe/pm: Wire up suspend/resume for I2C controller
98a024d58c08 drm/xe/xe_i2c: Add support for i2c in survivability mode

✗ CI.KUnit: failure for drm/xe: i2c support (rev2)

[Patchwork]

== Series Details ==

Series: drm/xe: i2c support (rev2)
URL   : https://patchwork.freedesktop.org/series/149699/
State : failure

== Summary ==

+ trap cleanup EXIT
+ /kernel/tools/testing/kunit/kunit.py run --kunitconfig /kernel/drivers/gpu/drm/xe/.kunitconfig
ERROR:root:../drivers/gpu/drm/xe/xe_i2c.c:203:21: error: variable ‘i2c_regmap_config’ has initializer but incomplete type
  203 | static const struct regmap_config i2c_regmap_config = {
      |                     ^~~~~~~~~~~~~
../drivers/gpu/drm/xe/xe_i2c.c:204:10: error: ‘const struct regmap_config’ has no member named ‘reg_bits’
  204 |         .reg_bits = 32,
      |          ^~~~~~~~
../drivers/gpu/drm/xe/xe_i2c.c:204:21: warning: excess elements in struct initializer
  204 |         .reg_bits = 32,
      |                     ^~
../drivers/gpu/drm/xe/xe_i2c.c:204:21: note: (near initialization for ‘i2c_regmap_config’)
../drivers/gpu/drm/xe/xe_i2c.c:205:10: error: ‘const struct regmap_config’ has no member named ‘val_bits’
  205 |         .val_bits = 32,
      |          ^~~~~~~~
../drivers/gpu/drm/xe/xe_i2c.c:205:21: warning: excess elements in struct initializer
  205 |         .val_bits = 32,
      |                     ^~
../drivers/gpu/drm/xe/xe_i2c.c:205:21: note: (near initialization for ‘i2c_regmap_config’)
../drivers/gpu/drm/xe/xe_i2c.c:206:10: error: ‘const struct regmap_config’ has no member named ‘reg_read’
  206 |         .reg_read = xe_i2c_read,
      |          ^~~~~~~~
../drivers/gpu/drm/xe/xe_i2c.c:206:21: warning: excess elements in struct initializer
  206 |         .reg_read = xe_i2c_read,
      |                     ^~~~~~~~~~~
../drivers/gpu/drm/xe/xe_i2c.c:206:21: note: (near initialization for ‘i2c_regmap_config’)
../drivers/gpu/drm/xe/xe_i2c.c:207:10: error: ‘const struct regmap_config’ has no member named ‘reg_write’
  207 |         .reg_write = xe_i2c_write,
      |          ^~~~~~~~~
../drivers/gpu/drm/xe/xe_i2c.c:207:22: warning: excess elements in struct initializer
  207 |         .reg_write = xe_i2c_write,
      |                      ^~~~~~~~~~~~
../drivers/gpu/drm/xe/xe_i2c.c:207:22: note: (near initialization for ‘i2c_regmap_config’)
../drivers/gpu/drm/xe/xe_i2c.c:208:10: error: ‘const struct regmap_config’ has no member named ‘fast_io’
  208 |         .fast_io = true,
      |          ^~~~~~~
../drivers/gpu/drm/xe/xe_i2c.c:208:20: warning: excess elements in struct initializer
  208 |         .fast_io = true,
      |                    ^~~~
../drivers/gpu/drm/xe/xe_i2c.c:208:20: note: (near initialization for ‘i2c_regmap_config’)
../drivers/gpu/drm/xe/xe_i2c.c: In function ‘xe_i2c_probe’:
../drivers/gpu/drm/xe/xe_i2c.c:273:18: error: implicit declaration of function ‘devm_regmap_init’ [-Werror=implicit-function-declaration]
  273 |         regmap = devm_regmap_init(i2c->drm_dev, NULL, i2c, &i2c_regmap_config);
      |                  ^~~~~~~~~~~~~~~~
../drivers/gpu/drm/xe/xe_i2c.c:273:16: warning: assignment to ‘struct regmap *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
  273 |         regmap = devm_regmap_init(i2c->drm_dev, NULL, i2c, &i2c_regmap_config);
      |                ^
../drivers/gpu/drm/xe/xe_i2c.c: At top level:
../drivers/gpu/drm/xe/xe_i2c.c:203:35: error: storage size of ‘i2c_regmap_config’ isn’t known
  203 | static const struct regmap_config i2c_regmap_config = {
      |                                   ^~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
make[7]: *** [../scripts/Makefile.build:287: drivers/gpu/drm/xe/xe_i2c.o] Error 1
make[7]: *** Waiting for unfinished jobs....
make[6]: *** [../scripts/Makefile.build:554: drivers/gpu/drm/xe] Error 2
make[5]: *** [../scripts/Makefile.build:554: drivers/gpu/drm] Error 2
make[4]: *** [../scripts/Makefile.build:554: drivers/gpu] Error 2
make[3]: *** [../scripts/Makefile.build:554: drivers] Error 2
make[2]: *** [/kernel/Makefile:2006: .] Error 2
make[1]: *** [/kernel/Makefile:248: __sub-make] Error 2
make: *** [Makefile:248: __sub-make] Error 2

[11:04:39] Configuring KUnit Kernel ...
Generating .config ...
Populating config with:
$ make ARCH=um O=.kunit olddefconfig
[11:04:43] Building KUnit Kernel ...
Populating config with:
$ make ARCH=um O=.kunit olddefconfig
Building with:
$ make all compile_commands.json scripts_gdb ARCH=um O=.kunit --jobs=48
+ cleanup
++ stat -c %u:%g /kernel
+ chown -R 1003:1003 /kernel