https://github.com/torvalds/linux
Revision 508ccea177ba35cbac382b9873c5cd77985bdf8d authored by Srinivas Kandagatla on 30 June 2014, 17:29:57 UTC, committed by Felipe Balbi on 30 June 2014, 18:23:57 UTC
Use case is when the phy is configured in host mode and a usb device is attached to board before bootup. On bootup, with the existing code and runtime pm enabled, the driver would decrement the pm usage count without checking the current state of the phy. This pm usage count decrement would trigger the runtime pm which than would abort the usb enumeration which was in progress. In my case a usb stick gets detected and then immediatly the driver goes to low power mode which is not correct. log: [ 1.631412] msm_hsusb_host 12520000.usb: EHCI Host Controller [ 1.636556] msm_hsusb_host 12520000.usb: new USB bus registered, assigned bus number 1 [ 1.642563] msm_hsusb_host 12520000.usb: irq 220, io mem 0x12520000 [ 1.658197] msm_hsusb_host 12520000.usb: USB 2.0 started, EHCI 1.00 [ 1.659473] hub 1-0:1.0: USB hub found [ 1.663415] hub 1-0:1.0: 1 port detected ... [ 1.973352] usb 1-1: new high-speed USB device number 2 using msm_hsusb_host [ 2.107707] usb-storage 1-1:1.0: USB Mass Storage device detected [ 2.108993] scsi0 : usb-storage 1-1:1.0 [ 2.678341] msm_otg 12520000.phy: USB in low power mode [ 3.168977] usb 1-1: USB disconnect, device number 2 This issue was detected on IFC6410 board. This patch fixes the intial runtime pm trigger by checking the phy state and decrementing the pm use count only when the phy state is IDLE. Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Felipe Balbi <balbi@ti.com>
1 parent c58d80f
Tip revision: 508ccea177ba35cbac382b9873c5cd77985bdf8d authored by Srinivas Kandagatla on 30 June 2014, 17:29:57 UTC
usb: phy: msm: Do not do runtime pm if the phy is not idle
usb: phy: msm: Do not do runtime pm if the phy is not idle
Tip revision: 508ccea
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drivers | ||
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include | ||
init | ||
ipc | ||
kernel | ||
lib | ||
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net | ||
samples | ||
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tools | ||
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COPYING | -rw-r--r-- | 18.3 KB |
CREDITS | -rw-r--r-- | 93.6 KB |
Kbuild | -rw-r--r-- | 2.5 KB |
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MAINTAINERS | -rw-r--r-- | 275.0 KB |
Makefile | -rw-r--r-- | 50.8 KB |
README | -rw-r--r-- | 18.3 KB |
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