Quoting Tony Lindgren (2019-02-11 14:59:07) > I noticed that modprobe clk-twl6040 can fail after a cold boot with: > abe_cm:clk:0010:0: failed to enable > ... > Unhandled fault: imprecise external abort (0x1406) at 0xbe896b20 > > WARNING: CPU: 1 PID: 29 at drivers/clk/clk.c:828 clk_core_disable_lock+0x18/0x24 > ... > (clk_core_disable_lock) from [<c0123534>] (_disable_clocks+0x18/0x90) > (_disable_clocks) from [<c0124040>] (_idle+0x17c/0x244) > (_idle) from [<c0125ad4>] (omap_hwmod_idle+0x24/0x44) > (omap_hwmod_idle) from [<c053a038>] (sysc_runtime_suspend+0x48/0x108) > (sysc_runtime_suspend) from [<c06084c4>] (__rpm_callback+0x144/0x1d8) > (__rpm_callback) from [<c0608578>] (rpm_callback+0x20/0x80) > (rpm_callback) from [<c0607034>] (rpm_suspend+0x120/0x694) > (rpm_suspend) from [<c0607a78>] (__pm_runtime_idle+0x60/0x84) > (__pm_runtime_idle) from [<c053aaf0>] (sysc_probe+0x874/0xf2c) > (sysc_probe) from [<c05fecd4>] (platform_drv_probe+0x48/0x98) > > After searching around for a similar issue, I came across an earlier fix > that never got merged upstream in the Android tree for glass-omap-xrr02. > There is patch "MFD: twl6040-codec: Implement PDMCLK cold temp errata" > by Misael Lopez Cruz <misael.lopez@xxxxxx>. > > Based on my observations, this fix is also needed when cold booting > devices, and not just for deeper idle modes. Since we now have a clock > driver for pdmclk, let's fix the issue in twl6040_pdmclk_prepare(). > > Cc: Misael Lopez Cruz <misael.lopez@xxxxxx> > Cc: Peter Ujfalusi <peter.ujfalusi@xxxxxx> > Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx> Should this be backported to stable trees?
