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).
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);
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