diff options
| -rw-r--r-- | arch/arm/mach-omap2/pm44xx.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/arch/arm/mach-omap2/pm44xx.c b/arch/arm/mach-omap2/pm44xx.c index aa6fd98f606e..ea62e75ef21d 100644 --- a/arch/arm/mach-omap2/pm44xx.c +++ b/arch/arm/mach-omap2/pm44xx.c @@ -77,10 +77,20 @@ static int omap4_pm_suspend(void) omap_set_pwrdm_state(pwrst->pwrdm, pwrst->saved_state); pwrdm_set_logic_retst(pwrst->pwrdm, pwrst->saved_logic_state); } - if (ret) + if (ret) { pr_crit("Could not enter target state in pm_suspend\n"); - else + /* + * OMAP4 chip PM currently works only with certain (newer) + * versions of bootloaders. This is due to missing code in the + * kernel to properly reset and initialize some devices. + * Warn the user about the bootloader version being one of the + * possible causes. + * http://www.spinics.net/lists/arm-kernel/msg218641.html + */ + pr_warn("A possible cause could be an old bootloader - try u-boot >= v2012.07\n"); + } else { pr_info("Successfully put all powerdomains to target state\n"); + } return 0; } @@ -146,6 +156,13 @@ int __init omap4_pm_init(void) } pr_err("Power Management for TI OMAP4.\n"); + /* + * OMAP4 chip PM currently works only with certain (newer) + * versions of bootloaders. This is due to missing code in the + * kernel to properly reset and initialize some devices. + * http://www.spinics.net/lists/arm-kernel/msg218641.html + */ + pr_warn("OMAP4 PM: u-boot >= v2012.07 is required for full PM support\n"); ret = pwrdm_for_each(pwrdms_setup, NULL); if (ret) { |