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Hi Neil,
On 01/09/13 00:29, NeilBrown wrote:
>
> Hi,
> I'm trying to get off_mode working reliably on my gta04 mobile phone.
>
> My current stumbling block is USB. The "Option" GSM module is attached via
> USB (there is a separate transceiver chip attached to port 1 which is placed
> in OMAP_EHCI_PORT_MODE_PHY).
Which PHY is this (vendor/model)?
>
> After a suspend/resume cycle with off_mode enabled the GSM module disappears.
> i.e. 'lsusb' doesn't see it any more and the various ttyHSxx devices don't
> exist.
> Without off mode, the modem always appears after resume.
>
> I discovered that the registers set by:
>
> drivers/mfd/omap-usb-host.c
>
> are not maintained across as suspend/resume so I added the following patch
> (which I can make a formal submission of if it looks right to others), but
> that didn't help (or didn't help enough).
>
> If I
>
> echo 1 > /sys/kernel/debug/pm_debug/usbhost_pwrdm/suspend
>
> thus keeping just the USBHOST power domain out of off_mode, the GSM module
> doesn't disappear. So it seems that some context in the usbhost domain is
> not being save and restored.
>
> This is as far as I can get. Can someone suggest where I should look to find
> out what is not being saved/restored properly, and how to go about saving and
> restoring?
>
> Thanks in advance,
> NeilBrown
>
>
>
> diff --git a/drivers/mfd/omap-usb-host.c b/drivers/mfd/omap-usb-host.c
> index 23cec57..522405e 100644
> --- a/drivers/mfd/omap-usb-host.c
> +++ b/drivers/mfd/omap-usb-host.c
> @@ -100,6 +100,10 @@ struct usbhs_hcd_omap {
>
> void __iomem *uhh_base;
>
> + struct {
> + unsigned hostconfig;
> + } context;
> +
> struct usbhs_omap_platform_data platdata;
>
> u32 usbhs_rev;
> @@ -300,6 +304,10 @@ static int usbhs_runtime_resume(struct device *dev)
> clk_enable(omap->utmi_p1_fck);
> clk_enable(omap->utmi_p2_fck);
>
> + usbhs_write(omap->uhh_base,
> + OMAP_UHH_HOSTCONFIG,
> + omap->context.hostconfig);
> +
> spin_unlock_irqrestore(&omap->lock, flags);
>
> return 0;
> @@ -319,6 +327,8 @@ static int usbhs_runtime_suspend(struct device *dev)
> }
>
> spin_lock_irqsave(&omap->lock, flags);
> + omap->context.hostconfig = usbhs_read(omap->uhh_base,
> + OMAP_UHH_HOSTCONFIG);
>
> if (is_ehci_tll_mode(pdata->port_mode[0]))
> clk_disable(omap->usbhost_p1_fck);
- --
Regards,
Igor.
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