From be97f5670582c6412bd979a21c87b999421ac05f Mon Sep 17 00:00:00 2001 From: Jouni Hogander Date: Sat, 23 Aug 2008 16:11:49 -0700 Subject: [PATCH] ARM: OMAP: 34xx specific check wether any fck is active before entering sleep We cannot enter sleep_while_idle if some functional clocks are active. Add a check for enabled functional clocks for 34xx. Note that this workaround could be behind CONFIG_PM_DEBUG option when all drivers are configuring their sysconfig registers properly and using their clocks properly. Signed-off-by: Jouni Hogander Signed-off-by: Tony Lindgren --- arch/arm/mach-omap2/pm34xx.c | 37 ++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c index a57cf4172a0..a145f807236 100644 --- a/arch/arm/mach-omap2/pm34xx.c +++ b/arch/arm/mach-omap2/pm34xx.c @@ -174,10 +174,47 @@ static void omap_sram_idle(void) omap2_gpio_resume_after_retention(); } +/* + * Check if functional clocks are enabled before entering + * sleep. This function could be behind CONFIG_PM_DEBUG + * when all drivers are configuring their sysconfig registers + * properly and using their clocks properly. + */ +static int omap3_fclks_active(void) +{ + u32 fck_core1 = 0, fck_core3 = 0, fck_sgx = 0, fck_dss = 0, + fck_cam = 0, fck_per = 0, fck_usbhost = 0; + + fck_core1 = cm_read_mod_reg(CORE_MOD, + CM_FCLKEN1); + if (is_sil_rev_greater_than(OMAP3430_REV_ES1_0)) { + fck_core3 = cm_read_mod_reg(CORE_MOD, + OMAP3430ES2_CM_FCLKEN3); + fck_sgx = cm_read_mod_reg(OMAP3430ES2_SGX_MOD, + CM_FCLKEN); + fck_usbhost = cm_read_mod_reg(OMAP3430ES2_USBHOST_MOD, + CM_FCLKEN); + } else + fck_sgx = cm_read_mod_reg(GFX_MOD, + OMAP3430ES2_CM_FCLKEN3); + fck_dss = cm_read_mod_reg(OMAP3430_DSS_MOD, + CM_FCLKEN); + fck_cam = cm_read_mod_reg(OMAP3430_CAM_MOD, + CM_FCLKEN); + fck_per = cm_read_mod_reg(OMAP3430_PER_MOD, + CM_FCLKEN); + if (fck_core1 | fck_core3 | fck_sgx | fck_dss | + fck_cam | fck_per | fck_usbhost) + return 1; + return 0; +} + static int omap3_can_sleep(void) { if (!enable_dyn_sleep) return 0; + if (omap3_fclks_active()) + return 0; if (atomic_read(&sleep_block) > 0) return 0; return 1; -- 2.41.0