Re: [PATCH 1/2] mmc: sdhci: Add support for setting parent clock

[Adrian Hunter]

On 03/16/2017 12:32 PM, Jon Hunter wrote:
> It is common for SD/MMC host controllers to set the parent clock that
> drives the SD/MMC interface in order to support various operating
> speeds. Typically, this is performed by calling common clock framework
> APIs such as clk_set_rate(). The problem is that these APIs may sleep
> and must not be called from within atomic sections and therefore, these
> functions cannot be called within the existing 'set_clock' SDHCI
> operator because they are called from within the context of a spinlock.
> Add a new 'set_parent_clock' operator for the SDHCI driver that is
> called early during the SDHCI 'set_ios' before the spinlock is aquire to
> give the platform driver the opportunity to set the parent clock rate.

I just posted a patch to remove the spin lock from set_ios().  Does that help?