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ARM: OMAP1: Fix reprogramming of DPLL1 for systems that boot at rates below 60MHz

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Commit e9b7086b80c4d9e354f4edc9e280ae85a60df408 (ARM: OMAP: Fix
reprogramming of dpll1 rate) fixed a regression for systems that
did not rely on bootloader set rates.

However, it also introduced a new problem where the rates selected
in .config would not take affect as omap1_select_table_rate
currently refuses to reprogram DPLL1 if it's already initialized.

This was not a problem earlier, as the reprogramming was done
earlier with ck_dpll1_p->rate uninitialized.

Fix this by forcing the reprogramming on systems booting at rates
below 60MHz. Note that the long term fix is to make the rates
SoC specific later on.

Thanks for Janusz Krzysztofik <jkrzyszt@tis.icnet.pl> for figuring
this one out.

Reported-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Acked-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Tony Lindgren 2011-12-01 17:47:06 -08:00
parent 5611cc4572
commit 650f7a72b8
1 changed files with 3 additions and 0 deletions
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3
arch/arm/mach-omap1/clock_data.c
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@ -930,6 +930,9 @@ void __init omap1_clk_late_init(void)
if (ck_dpll1.rate >= OMAP1_DPLL1_SANE_VALUE)
return;
/* System booting at unusable rate, force reprogramming of DPLL1 */
ck_dpll1_p->rate = 0;
/* Find the highest supported frequency and enable it */
if (omap1_select_table_rate(&virtual_ck_mpu, ~0)) {
pr_err("System frequencies not set, using default. Check your config.\n");