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From:   Parshuram Raju Thombare <pthombar@cadence.com>
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Subject: RE: [PATCH v5 4/5] net: macb: add support for high speed interface
Thread-Topic: [PATCH v5 4/5] net: macb: add support for high speed interface
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Date:   Tue, 25 Jun 2019 08:55:14 +0000
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>> +static inline void gem_mac_configure(struct macb *bp, int speed)
>> +	switch (speed) {
>> +	case SPEED_1000:
>> +		gem_writel(bp, NCFGR, GEM_BIT(GBE) |
>> +			   gem_readl(bp, NCFGR));
>> +		break;
>> +	case SPEED_100:
>> +		macb_writel(bp, NCFGR, MACB_BIT(SPD) |
>> +			    macb_readl(bp, NCFGR));
>What happens to the NCFGR register if we call mac_config() first for
>a 1G speed, then 100M and finally 10M - what value does the NCFGR
>register end up with?
>
>I suspect it ends up with both the GBE and SPD bits set, and that is
>probably not what you want.

No, In gem_mac_config GBE and SPD bits are always cleared
before setting appropriate bits as per requested speed, duplex mode.


Regards,
Parshuram Thombare