diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-omap2/pm44xx.c | 36 |
1 files changed, 33 insertions, 3 deletions
diff --git a/arch/arm/mach-omap2/pm44xx.c b/arch/arm/mach-omap2/pm44xx.c index 0dda6cf8b855..b6f243db200d 100644 --- a/arch/arm/mach-omap2/pm44xx.c +++ b/arch/arm/mach-omap2/pm44xx.c @@ -203,6 +203,32 @@ static inline int omap4_init_static_deps(void) } /** + * omap5_dra7_init_static_deps - Init static clkdm dependencies on OMAP5 and + * DRA7 + * + * The dynamic dependency between MPUSS -> EMIF is broken and has + * not worked as expected. The hardware recommendation is to + * enable static dependencies for these to avoid system + * lock ups or random crashes. + */ +static inline int omap5_dra7_init_static_deps(void) +{ + struct clockdomain *mpuss_clkdm, *emif_clkdm; + int ret; + + mpuss_clkdm = clkdm_lookup("mpu_clkdm"); + emif_clkdm = clkdm_lookup("emif_clkdm"); + if (!mpuss_clkdm || !emif_clkdm) + return -EINVAL; + + ret = clkdm_add_wkdep(mpuss_clkdm, emif_clkdm); + if (ret) + pr_err("Failed to add MPUSS -> EMIF wakeup dependency\n"); + + return ret; +} + +/** * omap4_pm_init_early - Does early initialization necessary for OMAP4+ devices * * Initializes basic stuff for power management functionality. @@ -239,10 +265,14 @@ int __init omap4_pm_init(void) goto err2; } - if (cpu_is_omap44xx()) { + if (cpu_is_omap44xx()) ret = omap4_init_static_deps(); - if (ret) - goto err2; + else if (soc_is_omap54xx() || soc_is_dra7xx()) + ret = omap5_dra7_init_static_deps(); + + if (ret) { + pr_err("Failed to initialise static dependencies.\n"); + goto err2; } ret = omap4_mpuss_init(); |