Hi,

have you tested these patches also without PCC? So, we can be sure there
is no regression?

> diff --git a/drivers/i2c/busses/i2c-xgene-slimpro.c 
> b/drivers/i2c/busses/i2c-xgene-slimpro.c
> index 96545aa..a5771c1 100644
> --- a/drivers/i2c/busses/i2c-xgene-slimpro.c
> +++ b/drivers/i2c/busses/i2c-xgene-slimpro.c
> @@ -32,6 +32,8 @@
>  #include <linux/platform_device.h>
>  #include <linux/version.h>
>  
> +#include <acpi/pcc.h>
> +

Please keep it sorted alphabetically.

> +#define PCC_CMD_GENERATE_DB_INT              BIT(15)
> +#define PCC_STS_CMD_COMPLETE         BIT(0)
> +#define PCC_STS_SCI_DOORBELL         BIT(1)
> +#define PCC_STS_ERR                  BIT(2)
> +#define PCC_STS_PLAT_NOTIFY          BIT(3)

Please keep it sorted by number.

> +     if (!acpi_disabled) {
> +             mutex_lock(&ctx->tx_mutex);
> +             init_completion(&ctx->rd_complete);

reinit_completion?

> +             slimpro_i2c_pcc_tx_prepare(ctx, msg);
> +     }
> +
> +     mutex_init(&ctx->tx_mutex);

Why this mutex, by the way? The i2c-core serializes access to the
adapter. Maybe I am missing something?

> +             cppc_ss = ctx->mbox_chan->con_priv;
> +             if (!cppc_ss) {
> +                     dev_err(&pdev->dev, "PPC subspace not found\n");
> +                     rc = -ENODEV;
> +                     goto mbox_err;
> +             }
> +
> +             if (!ctx->mbox_chan->mbox->txdone_irq) {
> +                     dev_err(&pdev->dev, "PCC IRQ not supported\n");
> +                     rc = -ENODEV;
> +                     goto mbox_err;
> +             }
>  
> +             /*
> +              * This is the shared communication region
> +              * for the OS and Platform to communicate over.
> +              */
> +             ctx->comm_base_addr = cppc_ss->base_address;
> +             if (ctx->comm_base_addr) {
> +                     ctx->pcc_comm_addr = memremap(ctx->comm_base_addr,
> +                                                   cppc_ss->length,
> +                                                   MEMREMAP_WB);
> +             } else {
> +                     dev_err(&pdev->dev, "Failed to get PCC comm region\n");
> +                     rc = -ENODEV;
> +                     goto mbox_err;
> +             }

I think it doesn't make sense to print a dev_err and return ENODEV which
is treated by the driver core as a non-error. It means "not present, but
OK". You probably want other error codes here.

Regards,

   Wolfram

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