Messages in this thread | | | Subject | Re: [PATCH 1/2] mmc: sdhci: Add support for setting parent clock | From | Adrian Hunter <> | Date | Mon, 20 Mar 2017 21:22:51 +0200 |
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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?
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