> -----Original Message-----
> From: Gulati, Shweta
> Sent: Wednesday, March 24, 2010 7:16 PM
> To: linux-omap@vger.kernel.org
> Cc: Gulati, Shweta; Sripathy, Vishwanath
> Subject: [PATCH L23.I3 PM 2/2]: Setting Mpu registers properly when
> enable_off_mode is enabled
Subject should be [PATCH 2/2] OMAP3 PM: Setting Mpu registers properly when
enable_off_mode is enabled. Do not put TI Internal release names.
>
> From: Shweta Gulati <shweta.gul...@ti.com>
>
> When enable_off_mode is enabled and ROM code issues WFI, the
> powerstate of all the powerdomains is set as OFF in PM_PWSTCTRL
> register and when it restores back the system to previous state
> it sets MPU as OFF and system hangs.
>
> This Patch ensures that for MPU the state is ON after it comes out of
> Idle/Suspend till it renters Idle.
>
>
> Signed-off-by: Vishwanath BS <vishwanath...@ti.com>
> Signed-off-by: Shweta Gulati <shweta.gul...@ti.com>
> ---
> Index: kernel-omap3-dev/arch/arm/mach-omap2/pm34xx.c
> =====================================================
> ==============
> --- kernel-omap3-dev.orig/arch/arm/mach-omap2/pm34xx.c
> +++ kernel-omap3-dev/arch/arm/mach-omap2/pm34xx.c
> @@ -573,8 +573,14 @@ void omap_sram_idle(void)
> _omap_sram_idle(omap3_arm_context, save_state);
> cpu_init();
>
> +
> if (is_suspending())
> pm_dbg_regset_save(2);
> + /* Ensure that Mpu state is restored back as ON
> + * after coming out of suspend/Idle.
> + */
> + prm_rmw_mod_reg_bits(OMAP_POWERSTATEST_MASK, 0x3,
> + MPU_MOD, PM_PWSTCTRL);
>
> /* Restore normal SDRC POWER settings */
> if (omap_rev() >= OMAP3430_REV_ES3_0 &&
> @@ -1209,10 +1215,16 @@ void omap3_pm_off_mode_enable(int enable
> resource_unlock_opp(VDD1_OPP);
> resource_unlock_opp(VDD2_OPP);
> #endif
> + /* For Mpu only next state should be set as OFF, the
> + * powerstate bits of PM_PWSTCTRL_MPU should not be explicitily
> + * set as OFF
> + */
> +
> list_for_each_entry(pwrst, &pwrst_list, node) {
> if (strcmp("iva2_pwrdm", pwrst->pwrdm->name)) {
> pwrst->next_state = state;
> - set_pwrdm_state(pwrst->pwrdm, state);
> + if (strcmp("mpu_pwrdm", pwrst->pwrdm->name))
> + set_pwrdm_state(pwrst->pwrdm, state);
> }
> }
> }
--
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