[RFC][PATCH] ibm_newemac: PowerPC 440EP/440GR EMAC PHY clock workaround

[Valentine Barshak]

Josh Boyer wrote:
> On Fri, 22 Feb 2008 22:28:17 +0300
> Valentine Barshak <vbarshak at ru.mvista.com> wrote:
> 
>> This patch adds ibm_newemac phy clock workaround for 440EP/440GR emacs.
>> The code is based on the previous ibm_emac driver stuff. The 440EP/440GR
>> allows controlling each EMAC clock spearately as opposed to global clock
>> selection for 440GX.
>>
>> Signed-off-by: Valentine Barshak <vbarshak at ru.mvista.com>
>> ---
> 
> [snip]
> 
>> +/* EMAC PHY clock workaround:
>> + * 440EP/440GR has more sane SDR0_MFR register implementation than 440GX,
>> + * which allows controlling each EMAC clock
>> + */
>> +static inline void emac_rx_clk_tx(struct emac_instance *dev)
>> +{
>> +	if (emac_has_feature(dev, EMAC_FTR_440EP_PHY_CLK_FIX)) {
>> +		unsigned long flags;
>> +
>> +		local_irq_save(flags);
>> +		mtdcri(SDR0, SDR0_MFR, mfdcri(SDR0, SDR0_MFR) |
>> +					(SDR0_MFR_ECS >> dev->cell_index));
>> +		local_irq_restore(flags);
>> +	}
>> +}
>> +
>> +static inline void emac_rx_clk_default(struct emac_instance *dev)
>> +{
>> +	if (emac_has_feature(dev, EMAC_FTR_440EP_PHY_CLK_FIX)) {
>> +		unsigned long flags;
>> +
>> +		local_irq_save(flags);
>> +		mtdcri(SDR0, SDR0_MFR, mfdcri(SDR0, SDR0_MFR) &
>> +					~(SDR0_MFR_ECS >> dev->cell_index));
>> +		local_irq_restore(flags);
>> +	}
>> +}
> 
> Why did you do local_irq_save in these two functions?  mtdcri already
> does spin_lock_irqsave...
> 
> josh

Oops, this got copy-pasted from the older ibm_emac.
Thanks,
Valentine.