diff mbox series

[v5,7/8] i2c: amd-asf: Clear remote IRR bit to get successive interrupt

Message ID 20240913121110.1611340-8-Shyam-sundar.S-k@amd.com
State New
Headers show
Series Introduce initial AMD ASF Controller driver support | expand

Commit Message

Shyam Sundar S K Sept. 13, 2024, 12:11 p.m. UTC 
To ensure successive interrupts upon packet reception, it is necessary to
clear the remote IRR bit by writing the interrupt number to the EOI
register. The base address for this operation is provided by the BIOS and
retrieved by the driver by traversing the ASF object's namespace.

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/i2c/busses/i2c-amd-asf-plat.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
diff mbox series

Patch

diff --git a/drivers/i2c/busses/i2c-amd-asf-plat.c b/drivers/i2c/busses/i2c-amd-asf-plat.c
index 1beef717ef40..77555416597f 100644
--- a/drivers/i2c/busses/i2c-amd-asf-plat.c
+++ b/drivers/i2c/busses/i2c-amd-asf-plat.c
@@ -45,6 +45,7 @@  static const char *amd_asf_port_name = " port 1";
 
 struct amd_asf_dev {
 	struct i2c_adapter adap;
+	void __iomem *eoi_base;
 	struct device *dev;
 	struct i2c_client *target;
 	struct delayed_work work_buf;
@@ -292,12 +293,14 @@  static irqreturn_t amd_asf_irq_handler(int irq, void *ptr)
 		amd_asf_update_bits(piix4_smba, ASF_SLV_INTR, SMBHSTSTS, true);
 	}
 
+	iowrite32(irq, dev->eoi_base);
 	return IRQ_HANDLED;
 }
 
 static int amd_asf_probe(struct platform_device *pdev)
 {
 	struct amd_asf_dev *asf_dev;
+	struct resource *eoi_addr;
 	int ret, irq;
 
 	asf_dev = devm_kzalloc(&pdev->dev, sizeof(*asf_dev), GFP_KERNEL);
@@ -312,6 +315,14 @@  static int amd_asf_probe(struct platform_device *pdev)
 	if (!asf_dev->port_addr)
 		return dev_err_probe(&pdev->dev, -EINVAL, "missing IO resources\n");
 
+	eoi_addr = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!eoi_addr)
+		return dev_err_probe(&pdev->dev, -EINVAL, "missing MEM resources\n");
+
+	asf_dev->eoi_base = devm_ioremap(&pdev->dev, eoi_addr->start, resource_size(eoi_addr));
+	if (!asf_dev->eoi_base)
+		return dev_err_probe(&pdev->dev, -EBUSY, "failed mapping IO region\n");
+
 	INIT_DELAYED_WORK(&asf_dev->work_buf, amd_asf_process_target);
 
 	irq = platform_get_irq(pdev, 0);