Tero Kristo <[email protected]> writes:
> From: Tero Kristo <[email protected]>
>
> OMAP3 sleep can be prevented in some cases where OTG autoidle is enabled.
> This patch force disables autoidle during wakeup from off-mode. See omap
> errata 1.164.
>
> This fix can't be done in driver level, as off-mode entry resets and enables
> the autoidle bit, and driver does not access the register after each off-mode
> entry even if it is loaded.
>
> Signed-off-by: Tero Kristo <[email protected]>
Thanks Tero for the updated changelog.
Applying to PM branch reluctantly and with grumbles. I sure hope
someone in TI is reporting all these ROM code issues to the ROM code
team so they get appropriate fixes.
Kevin
> ---
> arch/arm/mach-omap2/pm34xx.c | 6 ++++++
> arch/arm/mach-omap2/usb-musb.c | 14 ++++++++------
> arch/arm/plat-omap/include/plat/usb.h | 3 +++
> 3 files changed, 17 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
> index 2f9f4a0..ab7b30f 100644
> --- a/arch/arm/mach-omap2/pm34xx.c
> +++ b/arch/arm/mach-omap2/pm34xx.c
> @@ -37,6 +37,7 @@
> #include <plat/gpmc.h>
> #include <plat/dma.h>
> #include <plat/dmtimer.h>
> +#include <plat/usb.h>
>
> #include <plat/resource.h>
>
> @@ -496,6 +497,11 @@ void omap_sram_idle(void)
> omap3_prcm_restore_context();
> omap3_sram_restore_context();
> omap2_sms_restore_context();
> + /*
> + * Errata 1.164 fix : OTG autoidle can prevent
> + * sleep
> + */
> + usb_musb_disable_autoidle();
> }
> omap_uart_resume_idle(0);
> omap_uart_resume_idle(1);
> diff --git a/arch/arm/mach-omap2/usb-musb.c b/arch/arm/mach-omap2/usb-musb.c
> index f5364b8..bb3cee4 100644
> --- a/arch/arm/mach-omap2/usb-musb.c
> +++ b/arch/arm/mach-omap2/usb-musb.c
> @@ -44,10 +44,11 @@ static struct platform_device dummy_pdev = {
> },
> };
>
> +static void __iomem *otg_base;
> +static struct clk *otg_clk;
> +
> static void __init usb_musb_pm_init(void)
> {
> - void __iomem *otg_base;
> - struct clk *otg_clk;
> struct device *dev = &dummy_pdev.dev;
>
> if (!cpu_is_omap34xx())
> @@ -74,12 +75,13 @@ static void __init usb_musb_pm_init(void)
> cpu_relax();
> }
>
> - if (otg_clk) {
> + if (otg_clk)
> clk_disable(otg_clk);
> - clk_put(otg_clk);
> - }
> +}
>
> - iounmap(otg_base);
> +void usb_musb_disable_autoidle(void)
> +{
> + __raw_writel(0, otg_base + OTG_SYSCONFIG);
> }
>
> #ifdef CONFIG_USB_MUSB_SOC
> diff --git a/arch/arm/plat-omap/include/plat/usb.h
> b/arch/arm/plat-omap/include/plat/usb.h
> index 33a500e..31b13bc 100644
> --- a/arch/arm/plat-omap/include/plat/usb.h
> +++ b/arch/arm/plat-omap/include/plat/usb.h
> @@ -46,6 +46,9 @@ extern void usb_musb_init(void);
>
> extern void usb_ehci_init(struct ehci_hcd_omap_platform_data *pdata);
>
> +/* This is needed for OMAP3 errata 1.164: enabled autoidle can prevent sleep
> */
> +extern void usb_musb_disable_autoidle(void);
> +
> #endif
>
> void omap_usb_init(struct omap_usb_config *pdata);
> --
> 1.5.4.3
>
> --
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