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* [PATCH][next] phy: core: make NULL a valid phy reference if !CONFIG_GENERIC_PHY
@ 2014-03-13 11:11 Grygorii Strashko
  2014-03-13 13:37 ` Santosh Shilimkar
  2014-03-13 15:20 ` Felipe Balbi
  0 siblings, 2 replies; 11+ messages in thread
From: Grygorii Strashko @ 2014-03-13 11:11 UTC (permalink / raw)
  To: linux-arm-kernel

This fixes a regression on Keystone 2 platforms caused by patch
57303488cd37da58263e842de134dc65f7c626d5
"usb: dwc3: adapt dwc3 core to use Generic PHY Framework" which adds
optional support of generic phy in DWC3 core.

On Keystone 2 platforms the USB is not working now because
CONFIG_GENERIC_PHY isn't set and, as result, Generic PHY APIs stubs
return -ENOSYS always. The log shows:
 dwc3 2690000.dwc3: failed to initialize core
 dwc3: probe of 2690000.dwc3 failed with error -38

Hence, fix it by making NULL a valid phy reference in Generic PHY
APIs stubs in the same way as it was done by the patch
04c2facad8fee66c981a51852806d8923336f362 "drivers: phy: Make NULL
a valid phy reference".

CC: Kishon Vijay Abraham I <kishon@ti.com>
CC: Felipe Balbi <balbi@ti.com>
CC: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
---
 include/linux/phy/phy.h |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
index e2f5ca9..5a9b193 100644
--- a/include/linux/phy/phy.h
+++ b/include/linux/phy/phy.h
@@ -204,21 +204,29 @@ static inline void phy_pm_runtime_forbid(struct phy *phy)
 
 static inline int phy_init(struct phy *phy)
 {
+	if (!phy)
+		return 0;
 	return -ENOSYS;
 }
 
 static inline int phy_exit(struct phy *phy)
 {
+	if (!phy)
+		return 0;
 	return -ENOSYS;
 }
 
 static inline int phy_power_on(struct phy *phy)
 {
+	if (!phy)
+		return 0;
 	return -ENOSYS;
 }
 
 static inline int phy_power_off(struct phy *phy)
 {
+	if (!phy)
+		return 0;
 	return -ENOSYS;
 }
 
-- 
1.7.9.5

^ permalink raw reply related	[flat|nested] 11+ messages in thread

end of thread, other threads:[~2014-04-16 10:09 UTC | newest]

Thread overview: 11+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2014-03-13 11:11 [PATCH][next] phy: core: make NULL a valid phy reference if !CONFIG_GENERIC_PHY Grygorii Strashko
2014-03-13 13:37 ` Santosh Shilimkar
2014-03-13 13:43   ` Kishon Vijay Abraham I
2014-03-13 13:47     ` Santosh Shilimkar
2014-04-16 10:09   ` Kishon Vijay Abraham I
2014-03-13 15:20 ` Felipe Balbi
2014-03-13 21:44   ` Felipe Balbi
2014-04-02 17:53     ` Santosh Shilimkar
2014-04-02 18:16       ` Greg KH
2014-04-02 18:17         ` Santosh Shilimkar
2014-04-02 18:26           ` Greg KH

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