4.4-stable review patch. If anyone has any objections, please let me know.
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From: Andreas Kemnade andreas@kemnade.info
[ Upstream commit 17539f2f4f0b7fa906b508765c8ada07a1e45f52 ]
On dm3730 there are enumeration problems after resume. Investigation led to the cause that the MUSB_POWER_SOFTCONN bit is not set. If it was set before suspend (because it was enabled via musb_pullup()), it is set in musb_restore_context() so the pullup is enabled. But then musb_start() is called which overwrites MUSB_POWER and therefore disables MUSB_POWER_SOFTCONN, so no pullup is enabled and the device is not enumerated.
So let's do a subset of what musb_start() does in the same way as musb_suspend() does it. Platform-specific stuff it still called as there might be some phy-related stuff which needs to be enabled. Also interrupts are enabled, as it was the original idea of calling musb_start() in musb_resume() according to Commit 6fc6f4b87cb3 ("usb: musb: Disable interrupts on suspend, enable them on resume")
Signed-off-by: Andreas Kemnade andreas@kemnade.info Tested-by: Tony Lindgren tony@atomide.com Signed-off-by: Bin Liu b-liu@ti.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/musb/musb_core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -2522,7 +2522,8 @@ static int musb_resume(struct device *de pm_runtime_set_active(dev); pm_runtime_enable(dev);
- musb_start(musb); + musb_enable_interrupts(musb); + musb_platform_enable(musb);
return 0; }