[Bug 91410] [BDW][Audio][HD-A Display] DP/HDMI audio playback abnormal

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91410

--- Comment #19 from Vasily Khoruzhick <anarsoul at gmail.com> ---
(In reply to Vasily Khoruzhick from comment #18)
> (In reply to Lu, Han from comment #12)
> > Hi Vasily,
> > 
> > The issue is reproduced in our BDW NUC too.
> > I applied the "diagnose.patch" and check the dmesg, the cdclock received by
> > audio changes when issue happens:
> > in normal case, cdclock = 337.5MHz;
> > when issue happened, cdclock = 540MHz.
> > 
> > Could you please double check on your platform, through either intel_reg
> > read or dmesg, to see if we observed the same issue? Sorry I have no Lenovo
> > Carbon X1 gen3 laptop on my hand.
> 
> Hi Lu,
> 
> I always get cdclock = 675000. It always fails for me, it doesn't depend on
> whether system was suspended or not. 
> 
> Probably snd_hdac_get_display_clk() returns incorrect value?

# intel_reg read 0x130040
                                    (0x00130040): 0x48000000


(0x48000000 & LCPLL_CLK_FREQ_MASK) = 0x8000000 = LCPLL_CLK_FREQ_337_5_BDW

How come it returns 675000 from broadwell_get_display_clock_speed()?:

https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/drivers/gpu/drm/i915/intel_display.c?h=linux-4.4.y#n6788

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