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platform/x86: intel_scu_ipc: Fix interrupt support 

commit e48b72a568 upstream.

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@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Mika Westerberg 2020-01-22 19:28:04 +03:00 committed by Greg Kroah-Hartman
parent 5bf25f3828
commit 68efc422c5
1 changed files with 8 additions and 13 deletions
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21
drivers/platform/x86/intel_scu_ipc.c
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@ -67,26 +67,22 @@
struct intel_scu_ipc_pdata_t {
u32 i2c_base;
u32 i2c_len;
u8 irq_mode;
};
static const struct intel_scu_ipc_pdata_t intel_scu_ipc_lincroft_pdata = {
.i2c_base = 0xff12b000,
.i2c_len = 0x10,
.irq_mode = 0,
};
/* Penwell and Cloverview */
static const struct intel_scu_ipc_pdata_t intel_scu_ipc_penwell_pdata = {
.i2c_base = 0xff12b000,
.i2c_len = 0x10,
.irq_mode = 1,
};
static const struct intel_scu_ipc_pdata_t intel_scu_ipc_tangier_pdata = {
.i2c_base = 0xff00d000,
.i2c_len = 0x10,
.irq_mode = 0,
};
struct intel_scu_ipc_dev {
@ -99,6 +95,9 @@ 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)
/*
* IPC Read Buffer (Read Only):
* 16 byte buffer for receiving data from SCU, if IPC command
@ -120,11 +119,8 @@ 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);
}
/*
@ -610,9 +606,10 @@ EXPORT_SYMBOL(intel_scu_ipc_i2c_cntrl);
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;
}
@ -638,8 +635,6 @@ static int ipc_probe(struct pci_dev *pdev, const struct pci_device_id *id)
if (!pdata)
return -ENODEV;
scu->irq_mode = pdata->irq_mode;
err = pcim_enable_device(pdev);
if (err)
return err;