Re: [PATCH v6 5/6] platform/x86: intel_pmc_ipc: Fix iTCO_wdt GCS memory mapping failure

[Andy Shevchenko <andy.shevchenko@gmail.com>]

On Thu, Apr 6, 2017 at 1:54 AM, Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@linux.intel.com> wrote:
> iTCO_wdt driver need access to PMC_CFG GCR register to modify the
> noreboot setting. Currently, this is done by passing PMC_CFG reg
> address as memory resource to watchdog driver and allowing it directly
> modify the PMC_CFG register. But currently PMC driver also has
> requirement to memory map the entire GCR register space in this driver.
> This causes mem request failure in watchdog driver. So this patch fixes
> this issue by adding API to update noreboot flag and passes them
> to watchdog driver via platform data.

> +/* PMC_CFG_REG bit masks */
> +#define PMC_CFG_NO_REBOOT_MASK         BIT(4)

> +#define PMC_CFG_NO_REBOOT_ENABLE       BIT(4)
> +#define PMC_CFG_NO_REBOOT_DISABLE      0

I would go for those like
(1 << 4)
and
(0 << 4)
which for my opinion is better to get a picture.

> +static int update_no_reboot_bit(void *priv, bool set)
> +{
> +       if (set)
> +               return intel_pmc_gcr_update(PMC_GCR_PMC_CFG_REG,
> +                                           PMC_CFG_NO_REBOOT_MASK,
> +                                           PMC_CFG_NO_REBOOT_ENABLE);
> +
> +       return intel_pmc_gcr_update(PMC_GCR_PMC_CFG_REG,
> +                                   PMC_CFG_NO_REBOOT_MASK,
> +                                   PMC_CFG_NO_REBOOT_DISABLE);

u32 value = set ? PMC_CFG_NO_REBOOT_ENABLE : PMC_CFG_NO_REBOOT_DISABLE;

(also you may consider to use just *_EN and *_DIS)

return intel_pmc_gcr_update(PMC_GCR_PMC_CFG_REG,
                                   PMC_CFG_NO_REBOOT_MASK,
                                   value);
> +}

-- 
With Best Regards,
Andy Shevchenko