[Bug 71891] 3.13 fails to boot with the radeon module

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=71891

--- Comment #25 from Christian König <deathsimple at vodafone.de> ---
Thanks for testing this Dieter, that actually saved me quite some time.

The formular for the clock is (fb_div*ref_clock)/(fb_factor*post_div).

fb_factor is a fixed value comming from the hardware design (43663)

ref_clock (reference clock) is the external input clock to the RV730 asic, it's
value is burned into the BIOS (usually 27MHz for R7xx).

fb_div and post_div are the values the driver calculates to get a certain
frequency for the chip.

So for our values here we get:
(808574*27MHz)/(43663*5) = ~100MHz
(2585818*27MHz)/(43663*3) = ~533MHz
(2585818*27MHz)/(43663*4) = ~400MHz
Over all that looks perfectly fine.

Please provide the content of the registers CG_UPLL_FUNC_CNTL,
CG_UPLL_FUNC_CNTL_2 and CG_UPLL_FUNC_CNTL_3. E.g. install radeontool and
execute:

radeonreg regmatch 0x718
radeonreg regmatch 0x71c
radeonreg regmatch 0x720

Thx, Christian.

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