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Intermittent lock up by usdhc4_clk on iMx6Q

Question asked by Smriti Verma on Dec 3, 2015
Latest reply on Dec 14, 2015 by igorpadykov

We have been noticing intermittent lock up in mxcfb_pan_display function. It seems usdhc4_clk (arch/arm/mach-mx6/clock.c) grabs clocks_mutex of the common clock framework and doesn't release for 1- 2 secs which causes ipu clock (ipu1_clk) to starve for the mutex. Any idea what can cause usdhc4 to grab the mutex for such a long time?

 

We have an iMx6Q and eMMC on usdhc4.

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