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SubjectRe: [PATCH v2 06/36] platform/x86: intel_scu_ipc: Fix interrupt support
On Wed, Jan 08, 2020 at 02:41:31PM +0300, Mika Westerberg wrote:
> 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.
>

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

> Signed-off-by: Mika Westerberg <mika.westerberg@linux.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
>

--
With Best Regards,
Andy Shevchenko


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