Re: [PATCH 1/7] mmc: sdhci: fix base clock usage in preset value

[Adrian Hunter]

On 15/04/20 7:28 pm, Michał Mirosław wrote:
> On Wed, Apr 15, 2020 at 03:25:52PM +0300, Adrian Hunter wrote:
>> On 2/04/20 2:54 pm, Michał Mirosław wrote:
>>> Fixed commit added an unnecessary read of CLOCK_CONTROL. The value read
>>> is overwritten for programmable clock preset, but is carried over for
>>> divided clock preset. This can confuse sdhci_enable_clk() if the register
>>> has enable bits set for some reason at time time of clock calculation.
>>> value to be ORed with enable flags. Remove the read.
>>
>> The read is not needed, but drivers usually manage the enable bits,
>> especially disabling the clock before changing the frequency.  What driver
>> is it?
> 
> Hopefully no driver requires this. It's just removing a trap.

The only driver that looks like it would benefit is sdhci-brcmstb because it
does not clear enable bits in sdhci_brcmstb_set_clock().  Adding Al Cooper.
Al, can you ack this?