Tero Kristo <[email protected]> writes:
> From: Tero Kristo <[email protected]>
>
> Smartreflex for the corresponding powerdomain (MPU/CORE) must be disabled
> before the domain enters retention, otherwise the device may hang. This is
> caused by overlapping smartreflex / auto retention command on the voltage
> channel resulting in incorrect voltage.
>
> This fix has been confirmed from TI.
>
> Signed-off-by: Tero Kristo <[email protected]>
Thanks, applying to PM branch, queuing in pm-fixes.
Kevin
> ---
> arch/arm/mach-omap2/pm34xx.c | 22 +++++++++++++++++-----
> 1 files changed, 17 insertions(+), 5 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
> index 8353764..6782792 100644
> --- a/arch/arm/mach-omap2/pm34xx.c
> +++ b/arch/arm/mach-omap2/pm34xx.c
> @@ -403,11 +403,17 @@ void omap_sram_idle(void)
> if (pwrdm_read_pwrst(cam_pwrdm) == PWRDM_POWER_ON)
> omap2_clkdm_deny_idle(mpu_pwrdm->pwrdm_clkdms[0]);
>
> - /* CORE */
> - if (core_next_state < PWRDM_POWER_ON) {
> - /* Disable smartreflex before entering WFI */
> + /*
> + * Disable smartreflex before entering WFI.
> + * Only needed if we are going to enter retention or off.
> + */
> + if (mpu_next_state <= PWRDM_POWER_RET)
> disable_smartreflex(SR1);
> + if (core_next_state <= PWRDM_POWER_RET)
> disable_smartreflex(SR2);
> +
> + /* CORE */
> + if (core_next_state < PWRDM_POWER_ON) {
> omap_uart_prepare_idle(0);
> omap_uart_prepare_idle(1);
> if (core_next_state == PWRDM_POWER_OFF) {
> @@ -480,10 +486,16 @@ void omap_sram_idle(void)
> prm_clear_mod_reg_bits(OMAP3430_AUTO_RET,
> OMAP3430_GR_MOD,
> OMAP3_PRM_VOLTCTRL_OFFSET);
> - /* Enable smartreflex after WFI */
> + }
> +
> + /*
> + * Enable smartreflex after WFI. Only needed if we entered
> + * retention or off
> + */
> + if (mpu_next_state <= PWRDM_POWER_RET)
> enable_smartreflex(SR1);
> + if (core_next_state <= PWRDM_POWER_RET)
> enable_smartreflex(SR2);
> - }
>
> /* PER */
> if (per_next_state < PWRDM_POWER_ON) {
> --
> 1.5.4.3
>
> --
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