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ARM: OMAP4: clock data: lock USB DPLL on boot 

Some versions of the u-boot bootloader do not lock the USB DPLL and
when the USB DPLL is not locked, then it is observed that the L3INIT
power domain does not transition to retention state during kernel
suspend on OMAP4 devices. Fix this by locking the USB DPLL at 960 MHz
on kernel boot.

Signed-off-by: Jon Hunter <jon-hunter@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
This commit is contained in:
Jon Hunter 2013-03-13 04:11:23 -06:00 committed by Paul Walmsley
parent 13872ebb91
commit 71b37071f0
1 changed files with 15 additions and 0 deletions
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15
arch/arm/mach-omap2/cclock44xx_data.c
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@ -52,6 +52,13 @@
*/
#define OMAP4_DPLL_ABE_DEFFREQ 98304000
/*
* OMAP4 USB DPLL default frequency. In OMAP4430 TRM version V, section
* "3.6.3.9.5 DPLL_USB Preferred Settings" shows that the preferred
* locked frequency for the USB DPLL is 960MHz.
*/
#define OMAP4_DPLL_USB_DEFFREQ 960000000
/* Root clocks */
DEFINE_CLK_FIXED_RATE(extalt_clkin_ck, CLK_IS_ROOT, 59000000, 0x0);
@ -1705,5 +1712,13 @@ int __init omap4xxx_clk_init(void)
if (rc)
pr_err("%s: failed to configure ABE DPLL!\n", __func__);
/*
* Lock USB DPLL on OMAP4 devices so that the L3INIT power
* domain can transition to retention state when not in use.
*/
rc = clk_set_rate(&dpll_usb_ck, OMAP4_DPLL_USB_DEFFREQ);
if (rc)
pr_err("%s: failed to configure USB DPLL!\n", __func__);
return 0;
}