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usb: dwc3: make sure UX_EXIT_PX is cleared 

This bit is only supposed to be used with known
buggy PHYs, however some platforms might erroneously
set it. In order to avoid it, let's make sure this
bit is always cleared. If some PHY needs this, we
will need to add a quirk flag.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Felipe Balbi 2016-08-03 14:16:15 +03:00
parent c02ed2e75e
commit 1966b8657d
2 changed files with 7 additions and 0 deletions
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6
drivers/usb/dwc3/core.c
View File

@ -431,6 +431,12 @@ static int dwc3_phy_setup(struct dwc3 *dwc)
reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
/*
* Make sure UX_EXIT_PX is cleared as that causes issues with some
* PHYs. Also, this bit is not supposed to be used in normal operation.
*/
reg &= ~DWC3_GUSB3PIPECTL_UX_EXIT_PX;
/*
* Above 1.94a, it is recommended to set DWC3_GUSB3PIPECTL_SUSPHY
* to '0' during coreConsultant configuration. So default value

1
drivers/usb/dwc3/core.h
View File

@ -232,6 +232,7 @@
#define DWC3_GUSB3PIPECTL_PHYSOFTRST (1 << 31)
#define DWC3_GUSB3PIPECTL_U2SSINP3OK (1 << 29)
#define DWC3_GUSB3PIPECTL_DISRXDETINP3 (1 << 28)
#define DWC3_GUSB3PIPECTL_UX_EXIT_PX (1 << 27)
#define DWC3_GUSB3PIPECTL_REQP1P2P3 (1 << 24)
#define DWC3_GUSB3PIPECTL_DEP1P2P3(n) ((n) << 19)
#define DWC3_GUSB3PIPECTL_DEP1P2P3_MASK DWC3_GUSB3PIPECTL_DEP1P2P3(7)