linux-kernel - [PATCH v2 06/36] platform/x86: intel_scu

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Date:   Wed,  8 Jan 2020 14:41:31 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Darren Hart <dvhart@...radead.org>,
        Lee Jones <lee.jones@...aro.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Zha Qipeng <qipeng.zha@...el.com>,
        Rajneesh Bhardwaj <rajneesh.bhardwaj@...ux.intel.com>,
        "David E . Box" <david.e.box@...ux.intel.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 06/36] platform/x86: intel_scu_ipc: Fix interrupt support

Currently the driver has disabled interrupt support for Tangier but
actually interrupt works just fine if the command is not written twice
in a row. Also we need to ack the interrupt in the handler.

Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
 drivers/platform/x86/intel_scu_ipc.c | 48 ++++++----------------------
 1 file changed, 10 insertions(+), 38 deletions(-)

diff --git a/drivers/platform/x86/intel_scu_ipc.c b/drivers/platform/x86/intel_scu_ipc.c
index b39680b53387..43eaf9400c67 100644
--- a/drivers/platform/x86/intel_scu_ipc.c
+++ b/drivers/platform/x86/intel_scu_ipc.c
@@ -58,24 +58,6 @@
 #define IPC_RWBUF_SIZE    20		/* IPC Read buffer Size */
 #define IPC_IOC	          0x100		/* IPC command register IOC bit */
 
-#define PCI_DEVICE_ID_PENWELL		0x080e
-#define PCI_DEVICE_ID_CLOVERVIEW	0x08ea
-#define PCI_DEVICE_ID_TANGIER		0x11a0
-
-/* intel scu ipc driver data */
-struct intel_scu_ipc_pdata_t {
-	u8 irq_mode;
-};
-
-/* Penwell and Cloverview */
-static const struct intel_scu_ipc_pdata_t intel_scu_ipc_penwell_pdata = {
-	.irq_mode = 1,
-};
-
-static const struct intel_scu_ipc_pdata_t intel_scu_ipc_tangier_pdata = {
-	.irq_mode = 0,
-};
-
 struct intel_scu_ipc_dev {
 	struct device *dev;
 	void __iomem *ipc_base;
@@ -86,6 +68,7 @@ struct intel_scu_ipc_dev {
 static struct intel_scu_ipc_dev  ipcdev; /* Only one for now */
 
 #define IPC_STATUS		0x04
+#define IPC_STATUS_IRQ		BIT(2)
 #define IPC_STATUS_ERR		BIT(1)
 #define IPC_STATUS_BUSY		BIT(0)
 
@@ -107,11 +90,8 @@ static DEFINE_MUTEX(ipclock); /* lock used to prevent multiple call to SCU */
  */
 static inline void ipc_command(struct intel_scu_ipc_dev *scu, u32 cmd)
 {
-	if (scu->irq_mode) {
-		reinit_completion(&scu->cmd_complete);
-		writel(cmd | IPC_IOC, scu->ipc_base);
-	}
-	writel(cmd, scu->ipc_base);
+	reinit_completion(&scu->cmd_complete);
+	writel(cmd | IPC_IOC, scu->ipc_base);
 }
 
 /*
@@ -549,9 +529,10 @@ EXPORT_SYMBOL_GPL(intel_scu_ipc_raw_command);
 static irqreturn_t ioc(int irq, void *dev_id)
 {
 	struct intel_scu_ipc_dev *scu = dev_id;
+	int status = ipc_read_status(scu);
 
-	if (scu->irq_mode)
-		complete(&scu->cmd_complete);
+	writel(status | IPC_STATUS_IRQ, scu->ipc_base + IPC_STATUS);
+	complete(&scu->cmd_complete);
 
 	return IRQ_HANDLED;
 }
@@ -568,17 +549,10 @@ static int ipc_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	int err;
 	struct intel_scu_ipc_dev *scu = &ipcdev;
-	struct intel_scu_ipc_pdata_t *pdata;
 
 	if (scu->dev)		/* We support only one SCU */
 		return -EBUSY;
 
-	pdata = (struct intel_scu_ipc_pdata_t *)id->driver_data;
-	if (!pdata)
-		return -ENODEV;
-
-	scu->irq_mode = pdata->irq_mode;
-
 	err = pcim_enable_device(pdev);
 	if (err)
 		return err;
@@ -605,13 +579,11 @@ static int ipc_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	return 0;
 }
 
-#define SCU_DEVICE(id, pdata)	{PCI_VDEVICE(INTEL, id), (kernel_ulong_t)&pdata}
-
 static const struct pci_device_id pci_ids[] = {
-	SCU_DEVICE(PCI_DEVICE_ID_PENWELL,	intel_scu_ipc_penwell_pdata),
-	SCU_DEVICE(PCI_DEVICE_ID_CLOVERVIEW,	intel_scu_ipc_penwell_pdata),
-	SCU_DEVICE(PCI_DEVICE_ID_TANGIER,	intel_scu_ipc_tangier_pdata),
-	{}
+	{ PCI_VDEVICE(INTEL, 0x080e) },
+	{ PCI_VDEVICE(INTEL, 0x08ea) },
+	{ PCI_VDEVICE(INTEL, 0x11a0) },
+	{ }
 };
 
 static struct pci_driver ipc_driver = {
-- 
2.24.1