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[PATCH 3/6] i3c: master: Add ACPI support to i3c subsystem

Shyam Sundar S K posted 6 patches 1 month, 1 week ago
There is a newer version of this series
[PATCH 3/6] i3c: master: Add ACPI support to i3c subsystem
Posted by Shyam Sundar S K 1 month, 1 week ago 
As of now, the I3C subsystem only has ARM-specific initialization, and
there is no corresponding ACPI plumbing present. To address this, ACPI
support needs to be added to both the I3C core and DW driver.

Add support to get the ACPI handle from the _HID probed and parse the apci
object to retrieve the slave information from BIOS.

Based on the acpi object information propogated via BIOS, build the i3c
board information so that the same information can be used across the
driver to handle the slave requests.

Co-developed-by: Sanket Goswami <Sanket.Goswami@amd.com>
Signed-off-by: Sanket Goswami <Sanket.Goswami@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
---
 drivers/i3c/internals.h            |  2 +
 drivers/i3c/master.c               | 80 ++++++++++++++++++++++++++++++
 drivers/i3c/master/dw-i3c-master.c |  5 ++
 include/linux/i3c/master.h         |  1 +
 4 files changed, 88 insertions(+)

diff --git a/drivers/i3c/internals.h b/drivers/i3c/internals.h
index 433f6088b7ce..d2d6c69b19dd 100644
--- a/drivers/i3c/internals.h
+++ b/drivers/i3c/internals.h
@@ -10,6 +10,8 @@
 
 #include <linux/i3c/master.h>
 
+#define AMD_I3C_GET_SLAVE_ADDR		0x30
+
 void i3c_bus_normaluse_lock(struct i3c_bus *bus);
 void i3c_bus_normaluse_unlock(struct i3c_bus *bus);
 
diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index 6f3eb710a75d..20b83ca52d31 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -2251,6 +2251,80 @@ static int of_i3c_master_add_dev(struct i3c_master_controller *master,
 	return ret;
 }
 
+static int i3c_acpi_configure_master(struct i3c_master_controller *master)
+{
+	struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
+	enum i3c_addr_slot_status addrstatus;
+	struct i3c_dev_boardinfo *boardinfo;
+	struct device *dev = &master->dev;
+	struct fwnode_handle *fwnode;
+	struct acpi_device *adev;
+	u32 slv_addr, num_dev;
+	acpi_status status;
+	u64 val;
+
+	status = acpi_evaluate_object_typed(master->ahandle, "_DSD", NULL, &buf, ACPI_TYPE_PACKAGE);
+	if (ACPI_FAILURE(status)) {
+		dev_err(&master->dev, "Error reading _DSD:%s\n", acpi_format_exception(status));
+		return -ENODEV;
+	}
+
+	num_dev = device_get_child_node_count(dev);
+	if (!num_dev) {
+		dev_err(&master->dev, "Error: no child node present\n");
+		return -EINVAL;
+	}
+
+	device_for_each_child_node(dev, fwnode) {
+		adev = to_acpi_device_node(fwnode);
+		if (!adev)
+			return -ENODEV;
+
+		status = acpi_evaluate_integer(adev->handle, "_ADR", NULL, &val);
+		if (ACPI_FAILURE(status)) {
+			dev_err(&master->dev, "Error: eval _ADR failed\n");
+			return -EINVAL;
+		}
+		slv_addr = val >> AMD_I3C_GET_SLAVE_ADDR;
+
+		boardinfo = devm_kzalloc(dev, sizeof(*boardinfo), GFP_KERNEL);
+		if (!boardinfo)
+			return -ENOMEM;
+
+		if (slv_addr) {
+			if (slv_addr > I3C_MAX_ADDR)
+				return -EINVAL;
+
+			addrstatus = i3c_bus_get_addr_slot_status(&master->bus, slv_addr);
+			if (addrstatus != I3C_ADDR_SLOT_FREE)
+				return -EINVAL;
+		}
+
+		boardinfo->static_addr = slv_addr;
+		if (boardinfo->static_addr > I3C_MAX_ADDR)
+			return -EINVAL;
+
+		addrstatus = i3c_bus_get_addr_slot_status(&master->bus,	boardinfo->static_addr);
+		if (addrstatus != I3C_ADDR_SLOT_FREE)
+			return -EINVAL;
+
+		boardinfo->pid = (val & GENMASK(47, 0));
+		if ((boardinfo->pid & GENMASK_ULL(63, 48)) ||
+		    I3C_PID_RND_LOWER_32BITS(boardinfo->pid))
+			return -EINVAL;
+
+		/*
+		 * According to the specification, SETDASA is not supported for DIMM slaves
+		 * during device discovery. Therefore, AMD BIOS will populate same initial
+		 * dynamic address as the static address.
+		 */
+		boardinfo->init_dyn_addr = boardinfo->static_addr;
+		list_add_tail(&boardinfo->node, &master->boardinfo.i3c);
+	}
+
+	return 0;
+}
+
 static int of_populate_i3c_bus(struct i3c_master_controller *master)
 {
 	struct device *dev = &master->dev;
@@ -2771,6 +2845,12 @@ int i3c_master_register(struct i3c_master_controller *master,
 	master->dev.coherent_dma_mask = parent->coherent_dma_mask;
 	master->dev.dma_parms = parent->dma_parms;
 
+	if (has_acpi_companion(master->dev.parent)) {
+		ret = i3c_acpi_configure_master(master);
+		if (ret < 0)
+			return ret;
+	}
+
 	ret = of_populate_i3c_bus(master);
 	if (ret)
 		goto err_put_dev;
diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c
index fd58a95ae1c3..8d4583bc2113 100644
--- a/drivers/i3c/master/dw-i3c-master.c
+++ b/drivers/i3c/master/dw-i3c-master.c
@@ -1602,6 +1602,11 @@ int dw_i3c_common_probe(struct dw_i3c_master *master,
 	master->maxdevs = ret >> 16;
 	master->free_pos = GENMASK(master->maxdevs - 1, 0);
 
+	ACPI_COMPANION_SET(&master->base.dev, ACPI_COMPANION(&pdev->dev));
+	master->base.ahandle = acpi_device_handle(ACPI_COMPANION(&pdev->dev));
+	if (!master->base.ahandle)
+		dev_err(&pdev->dev, "Failed to get acpi device handle\n");
+
 	INIT_WORK(&master->hj_work, dw_i3c_hj_work);
 	ret = i3c_master_register(&master->base, &pdev->dev,
 				  &dw_mipi_i3c_ops, false);
diff --git a/include/linux/i3c/master.h b/include/linux/i3c/master.h
index 2a1ed05d5782..367faf7c4bf3 100644
--- a/include/linux/i3c/master.h
+++ b/include/linux/i3c/master.h
@@ -523,6 +523,7 @@ struct i3c_master_controller {
 	} boardinfo;
 	struct i3c_bus bus;
 	struct workqueue_struct *wq;
+	acpi_handle ahandle;
 };
 
 /**
-- 
2.34.1
Re: [PATCH 3/6] i3c: master: Add ACPI support to i3c subsystem
Posted by kernel test robot 1 month, 1 week ago 
Hi Shyam,

kernel test robot noticed the following build errors:

[auto build test ERROR on linus/master]
[also build test ERROR on v6.12-rc3 next-20241018]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Shyam-Sundar-S-K/i3c-dw-Add-support-for-AMDI0015-ACPI-ID/20241017-230810
base:   linus/master
patch link:    https://lore.kernel.org/r/20241017150330.3035568-4-Shyam-sundar.S-k%40amd.com
patch subject: [PATCH 3/6] i3c: master: Add ACPI support to i3c subsystem
config: openrisc-allyesconfig (https://download.01.org/0day-ci/archive/20241020/202410201553.RtPfO9pR-lkp@intel.com/config)
compiler: or1k-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241020/202410201553.RtPfO9pR-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410201553.RtPfO9pR-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/i3c/master/dw-i3c-master.c: In function 'dw_i3c_common_probe':
   drivers/i3c/master/dw-i3c-master.c:1606:32: error: implicit declaration of function 'acpi_device_handle'; did you mean 'acpi_fwnode_handle'? [-Wimplicit-function-declaration]
    1606 |         master->base.ahandle = acpi_device_handle(ACPI_COMPANION(&pdev->dev));
         |                                ^~~~~~~~~~~~~~~~~~
         |                                acpi_fwnode_handle
>> drivers/i3c/master/dw-i3c-master.c:1606:30: error: assignment to 'acpi_handle' {aka 'void *'} from 'int' makes pointer from integer without a cast [-Wint-conversion]
    1606 |         master->base.ahandle = acpi_device_handle(ACPI_COMPANION(&pdev->dev));
         |                              ^

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for GET_FREE_REGION
   Depends on [n]: SPARSEMEM [=n]
   Selected by [y]:
   - RESOURCE_KUNIT_TEST [=y] && RUNTIME_TESTING_MENU [=y] && KUNIT [=y]


vim +1606 drivers/i3c/master/dw-i3c-master.c

  1545	
  1546	int dw_i3c_common_probe(struct dw_i3c_master *master,
  1547				struct platform_device *pdev)
  1548	{
  1549		int ret, irq;
  1550	
  1551		if (!master->platform_ops)
  1552			master->platform_ops = &dw_i3c_platform_ops_default;
  1553	
  1554		master->dev = &pdev->dev;
  1555	
  1556		master->regs = devm_platform_ioremap_resource(pdev, 0);
  1557		if (IS_ERR(master->regs))
  1558			return PTR_ERR(master->regs);
  1559	
  1560		master->core_clk = devm_clk_get_enabled(&pdev->dev, NULL);
  1561		if (IS_ERR(master->core_clk))
  1562			return PTR_ERR(master->core_clk);
  1563	
  1564		master->pclk = devm_clk_get_optional_enabled(&pdev->dev, "pclk");
  1565		if (IS_ERR(master->pclk))
  1566			return PTR_ERR(master->pclk);
  1567	
  1568		master->core_rst = devm_reset_control_get_optional_exclusive(&pdev->dev,
  1569									    "core_rst");
  1570		if (IS_ERR(master->core_rst))
  1571			return PTR_ERR(master->core_rst);
  1572	
  1573		reset_control_deassert(master->core_rst);
  1574	
  1575		spin_lock_init(&master->xferqueue.lock);
  1576		INIT_LIST_HEAD(&master->xferqueue.list);
  1577	
  1578		writel(INTR_ALL, master->regs + INTR_STATUS);
  1579		irq = platform_get_irq(pdev, 0);
  1580		ret = devm_request_irq(&pdev->dev, irq,
  1581				       dw_i3c_master_irq_handler, IRQF_SHARED,
  1582				       dev_name(&pdev->dev), master);
  1583		if (ret)
  1584			goto err_assert_rst;
  1585	
  1586		platform_set_drvdata(pdev, master);
  1587	
  1588		pm_runtime_set_autosuspend_delay(&pdev->dev, RPM_AUTOSUSPEND_TIMEOUT);
  1589		pm_runtime_use_autosuspend(&pdev->dev);
  1590		pm_runtime_set_active(&pdev->dev);
  1591		pm_runtime_enable(&pdev->dev);
  1592	
  1593		/* Information regarding the FIFOs/QUEUEs depth */
  1594		ret = readl(master->regs + QUEUE_STATUS_LEVEL);
  1595		master->caps.cmdfifodepth = QUEUE_STATUS_LEVEL_CMD(ret);
  1596	
  1597		ret = readl(master->regs + DATA_BUFFER_STATUS_LEVEL);
  1598		master->caps.datafifodepth = DATA_BUFFER_STATUS_LEVEL_TX(ret);
  1599	
  1600		ret = readl(master->regs + DEVICE_ADDR_TABLE_POINTER);
  1601		master->datstartaddr = ret;
  1602		master->maxdevs = ret >> 16;
  1603		master->free_pos = GENMASK(master->maxdevs - 1, 0);
  1604	
  1605		ACPI_COMPANION_SET(&master->base.dev, ACPI_COMPANION(&pdev->dev));
> 1606		master->base.ahandle = acpi_device_handle(ACPI_COMPANION(&pdev->dev));
  1607		if (!master->base.ahandle)
  1608			dev_err(&pdev->dev, "Failed to get acpi device handle\n");
  1609	
  1610		INIT_WORK(&master->hj_work, dw_i3c_hj_work);
  1611		ret = i3c_master_register(&master->base, &pdev->dev,
  1612					  &dw_mipi_i3c_ops, false);
  1613		if (ret)
  1614			goto err_disable_pm;
  1615	
  1616		return 0;
  1617	
  1618	err_disable_pm:
  1619		pm_runtime_disable(&pdev->dev);
  1620		pm_runtime_set_suspended(&pdev->dev);
  1621		pm_runtime_dont_use_autosuspend(&pdev->dev);
  1622	
  1623	err_assert_rst:
  1624		reset_control_assert(master->core_rst);
  1625	
  1626		return ret;
  1627	}
  1628	EXPORT_SYMBOL_GPL(dw_i3c_common_probe);
  1629	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
Re: [PATCH 3/6] i3c: master: Add ACPI support to i3c subsystem
Posted by kernel test robot 1 month, 1 week ago 
Hi Shyam,

kernel test robot noticed the following build errors:

[auto build test ERROR on linus/master]
[also build test ERROR on v6.12-rc3 next-20241018]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Shyam-Sundar-S-K/i3c-dw-Add-support-for-AMDI0015-ACPI-ID/20241017-230810
base:   linus/master
patch link:    https://lore.kernel.org/r/20241017150330.3035568-4-Shyam-sundar.S-k%40amd.com
patch subject: [PATCH 3/6] i3c: master: Add ACPI support to i3c subsystem
config: arc-randconfig-001-20241020 (https://download.01.org/0day-ci/archive/20241020/202410201515.SaOuSc9G-lkp@intel.com/config)
compiler: arceb-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241020/202410201515.SaOuSc9G-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410201515.SaOuSc9G-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

   drivers/i3c/master/dw-i3c-master.c: In function 'dw_i3c_common_probe':
>> drivers/i3c/master/dw-i3c-master.c:1606:32: error: implicit declaration of function 'acpi_device_handle'; did you mean 'acpi_fwnode_handle'? [-Werror=implicit-function-declaration]
    1606 |         master->base.ahandle = acpi_device_handle(ACPI_COMPANION(&pdev->dev));
         |                                ^~~~~~~~~~~~~~~~~~
         |                                acpi_fwnode_handle
>> drivers/i3c/master/dw-i3c-master.c:1606:30: warning: assignment to 'acpi_handle' {aka 'void *'} from 'int' makes pointer from integer without a cast [-Wint-conversion]
    1606 |         master->base.ahandle = acpi_device_handle(ACPI_COMPANION(&pdev->dev));
         |                              ^
   cc1: some warnings being treated as errors


vim +1606 drivers/i3c/master/dw-i3c-master.c

  1545	
  1546	int dw_i3c_common_probe(struct dw_i3c_master *master,
  1547				struct platform_device *pdev)
  1548	{
  1549		int ret, irq;
  1550	
  1551		if (!master->platform_ops)
  1552			master->platform_ops = &dw_i3c_platform_ops_default;
  1553	
  1554		master->dev = &pdev->dev;
  1555	
  1556		master->regs = devm_platform_ioremap_resource(pdev, 0);
  1557		if (IS_ERR(master->regs))
  1558			return PTR_ERR(master->regs);
  1559	
  1560		master->core_clk = devm_clk_get_enabled(&pdev->dev, NULL);
  1561		if (IS_ERR(master->core_clk))
  1562			return PTR_ERR(master->core_clk);
  1563	
  1564		master->pclk = devm_clk_get_optional_enabled(&pdev->dev, "pclk");
  1565		if (IS_ERR(master->pclk))
  1566			return PTR_ERR(master->pclk);
  1567	
  1568		master->core_rst = devm_reset_control_get_optional_exclusive(&pdev->dev,
  1569									    "core_rst");
  1570		if (IS_ERR(master->core_rst))
  1571			return PTR_ERR(master->core_rst);
  1572	
  1573		reset_control_deassert(master->core_rst);
  1574	
  1575		spin_lock_init(&master->xferqueue.lock);
  1576		INIT_LIST_HEAD(&master->xferqueue.list);
  1577	
  1578		writel(INTR_ALL, master->regs + INTR_STATUS);
  1579		irq = platform_get_irq(pdev, 0);
  1580		ret = devm_request_irq(&pdev->dev, irq,
  1581				       dw_i3c_master_irq_handler, IRQF_SHARED,
  1582				       dev_name(&pdev->dev), master);
  1583		if (ret)
  1584			goto err_assert_rst;
  1585	
  1586		platform_set_drvdata(pdev, master);
  1587	
  1588		pm_runtime_set_autosuspend_delay(&pdev->dev, RPM_AUTOSUSPEND_TIMEOUT);
  1589		pm_runtime_use_autosuspend(&pdev->dev);
  1590		pm_runtime_set_active(&pdev->dev);
  1591		pm_runtime_enable(&pdev->dev);
  1592	
  1593		/* Information regarding the FIFOs/QUEUEs depth */
  1594		ret = readl(master->regs + QUEUE_STATUS_LEVEL);
  1595		master->caps.cmdfifodepth = QUEUE_STATUS_LEVEL_CMD(ret);
  1596	
  1597		ret = readl(master->regs + DATA_BUFFER_STATUS_LEVEL);
  1598		master->caps.datafifodepth = DATA_BUFFER_STATUS_LEVEL_TX(ret);
  1599	
  1600		ret = readl(master->regs + DEVICE_ADDR_TABLE_POINTER);
  1601		master->datstartaddr = ret;
  1602		master->maxdevs = ret >> 16;
  1603		master->free_pos = GENMASK(master->maxdevs - 1, 0);
  1604	
  1605		ACPI_COMPANION_SET(&master->base.dev, ACPI_COMPANION(&pdev->dev));
> 1606		master->base.ahandle = acpi_device_handle(ACPI_COMPANION(&pdev->dev));
  1607		if (!master->base.ahandle)
  1608			dev_err(&pdev->dev, "Failed to get acpi device handle\n");
  1609	
  1610		INIT_WORK(&master->hj_work, dw_i3c_hj_work);
  1611		ret = i3c_master_register(&master->base, &pdev->dev,
  1612					  &dw_mipi_i3c_ops, false);
  1613		if (ret)
  1614			goto err_disable_pm;
  1615	
  1616		return 0;
  1617	
  1618	err_disable_pm:
  1619		pm_runtime_disable(&pdev->dev);
  1620		pm_runtime_set_suspended(&pdev->dev);
  1621		pm_runtime_dont_use_autosuspend(&pdev->dev);
  1622	
  1623	err_assert_rst:
  1624		reset_control_assert(master->core_rst);
  1625	
  1626		return ret;
  1627	}
  1628	EXPORT_SYMBOL_GPL(dw_i3c_common_probe);
  1629	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Patchew 2.1-devel-b67e4c2

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