diff options
| author | Stefan Agner <stefan.agner@toradex.com> | 2015-06-30 13:13:39 +0200 |
|---|---|---|
| committer | Stefan Agner <stefan.agner@toradex.com> | 2015-08-04 17:51:29 +0200 |
| commit | f871d5d9dc03302ec54236dfa23b06bd65304c12 (patch) | |
| tree | 3e18880a9734dfde8d85879252e641eb9155aa8b /arch/arm/mach-imx | |
| parent | 81e5f332369e9f6df1a15195dab1d9a58edc798d (diff) | |
ARM: vf610: PM: enable Suspend-to-RAM only if hardware fixes are in place
To use self-refresh mode for DDR3 SDRAM memory in LPSTOPx mode, the
hardware need to have pull-ups/downs populated on RESET/CKE line of
the DDR memory. Read the device tree property which indicates whether
a given board has such resistors populated.
Diffstat (limited to 'arch/arm/mach-imx')
| -rw-r--r-- | arch/arm/mach-imx/pm-vf610.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/arch/arm/mach-imx/pm-vf610.c b/arch/arm/mach-imx/pm-vf610.c index fcf820e7b8d7..0d381723d40f 100644 --- a/arch/arm/mach-imx/pm-vf610.c +++ b/arch/arm/mach-imx/pm-vf610.c @@ -100,6 +100,7 @@ static void __iomem *ccm_base; static void __iomem *suspend_ocram_base; static void (*vf610_suspend_in_ocram_fn)(void __iomem *ocram_vbase); +static bool has_cke_reset_pulls; #ifdef DEBUG static void __iomem *uart_membase; @@ -423,7 +424,8 @@ static int vf610_pm_enter(suspend_state_t state) static int vf610_pm_valid(suspend_state_t state) { - return (state == PM_SUSPEND_STANDBY || state == PM_SUSPEND_MEM); + return (state == PM_SUSPEND_STANDBY || + (state == PM_SUSPEND_MEM && has_cke_reset_pulls)); } static const struct platform_suspend_ops vf610_pm_ops = { @@ -521,13 +523,21 @@ static int __init vf610_suspend_init(const struct vf610_pm_socdata *socdata) return ret; #endif - suspend_set_ops(&vf610_pm_ops); + node = of_find_compatible_node(NULL, NULL, socdata->ddrmc_compat); + if (node) { + has_cke_reset_pulls = + of_property_read_bool(node, "fsl,has-cke-reset-pulls"); - if (!socdata) { - pr_warn("%s: invalid argument!\n", __func__); - return -EINVAL; + of_node_put(node); } + if (has_cke_reset_pulls) + pr_info("PM: CKE/RESET pulls available, enable Suspend-to-RAM\n"); + else + pr_info("PM: No CKE/RESET pulls, disable Suspend-to-RAM\n"); + + suspend_set_ops(&vf610_pm_ops); + node = of_find_compatible_node(NULL, NULL, "mmio-sram"); if (!node) { pr_warn("%s: failed to find ocram node!\n", __func__); |