On Tue, Apr 4, 2017 at 3:24 AM, Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx> wrote:
> This patch adds API's to read/write/update PMC GC registers.
> PMC dependent devices like iTCO_wdt, Telemetry has requirement
> to acces GCR registers. These API's can be used for this
> purpose.
> +/* GCR reg offsets from gcr base*/
> +#define PMC_GCR_PMC_CFG_REG 0x08
> +
> --- a/drivers/platform/x86/intel_pmc_ipc.c
> +++ b/drivers/platform/x86/intel_pmc_ipc.c
> @@ -127,6 +127,7 @@ static struct intel_pmc_ipc_dev {
>
> /* gcr */
> resource_size_t gcr_base;
> + void __iomem *gcr_mem_base;
> int gcr_size;
Rearrange those lines to make __iomem pointer latter.
> +static inline int is_gcr_valid(u32 offset)
Same comment as previously. It should take a pointer to struct
intel_pmc_ipc_dev as a parameter.
> +/**
> + * intel_pmc_gcr_write() - Write PMC GCR register
> + * @offset: offset of GCR register from GCR address base
> + * @data: register update value
> + *
> + * Writes the PMC GCR register of given offset with given
> + * value
You have to use proper punctuation in the sentences in full Description section.
> +/**
> + * intel_pmc_gcr_update() - Update PMC GCR register bits
> + * @offset: offset of GCR register from GCR address base
> + * @mask: bit mask for update operation
> + * @val: update value
> + *
> + * Updates the bits of given GCR register as specified by
> + * @mask and @val
Ditto.
> +int intel_pmc_gcr_update(u32 offset, u32 mask, u32 val)
> +{
> + u32 orig, tmp;
One of them is redundant.
I would go just with
u32 value;
> + writel(tmp, ipcdev.gcr_mem_base + offset);
> +
> + tmp = readl(ipcdev.gcr_mem_base + offset);
> +
Redundant.
> + if ((tmp & mask) != (val & mask)) {
Why?! It the a case when writel() will fail? Needs to be commented.
> + ret = -EIO;
> + goto gcr_update_err;
> + }
> +
> +gcr_update_err:
The keyword 'unlock' is missed in the label name.
> + mutex_unlock(&ipclock);
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(intel_pmc_gcr_update);
--
With Best Regards,
Andy Shevchenko
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