> From: [email protected] [mailto:linux-omap-
> [email protected]] On Behalf Of Menon, Nishanth
> Sent: Wednesday, March 11, 2009 9:51 AM
> With the latest linux-omap pm + gitorious bridge changes on SDP3430, enabling
> BRIDGE_DVFS and SRF seems to cause an issue with clock notifier.. I am not
> entirely of the cause of the issue(don't have a debugger handy at the
> moment :( ): The condition is reproducible on exactly the third insmod of the
> driver as explained below. Looking for any advice to fix this issue :(
Does it need DVFS enabled to fail? Is voltage high enough (to current DM)?
There were some issues there.
Regards,
Richard W.
A side and possibly related note is the below 0x800 is way too high and will
likely result in screen or other fifo related effects. The delay target should
be around 5uS (for 26Mhz sysclk) and half of that for 13MHz sysclk.
Given a value of 0xC8 with ARM at 125MHz, a vdd2-opp2 -> vdd2-opp3 takes 105uS
using current code. This it self is too high for some display fifos. 0x800 is
out of the park high.
End note is needs tuning for DVFS.
configure_core_dpll:
ldr r4, omap3_cm_clksel1_pll
ldr r5, [r4]
ldr r6, core_m2_mask_val @ modify m2 for core dpll
and r5, r5, r6
orr r5, r5, r3, lsl #0x1B @ r3 contains the M2 val
str r5, [r4]
mov r5, #0x800 @ wait for the clock to stabilise
cmp r3, #2
bne wait_clk_stable
bx lr
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