From e6604a7fd71f9bd2890e07800e191167d7f5751b Mon Sep 17 00:00:00 2001 From: Christian Engelmayer Date: Wed, 3 Apr 2013 12:18:51 +0200 Subject: [PATCH] EHCI: Quirk flag for port power handling on overcurrent. Commit 756aa6b3d536afe85e151138cb03a293998887b3 (ehci-hub: improved over-current recovery) added port power cycling on overcurrent indications as needed by the MPC8349 USB controller after resolving of the overcurrent situation in order to have the host state machine assert the correct port status again. Commit 81463c1d707186adbbe534016cd1249edeab0dac (EHCI: only power off port if over-current is active) solved a thus resulting issue of endless overcurrent changes in combination with the MAX4967 USB power supply chip that signals overcurrent when power is not enabled by only powering off a port if the overcurrent is currently active. Added quirks flag need_oc_pp_cycle in order to specify the needed behaviour as there is no common behaviour that can comply with both requirements. Activated the quirks handling for Freescale 83xx based boards. Signed-off-by: Christian Engelmayer Acked-by: Alan Stern Acked-by: Sergei Shtylyov Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/ehci-fsl.c | 9 +++++++++ drivers/usb/host/ehci-hub.c | 3 ++- drivers/usb/host/ehci.h | 1 + 3 files changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c index d81d2fcbff1..3be3df233a0 100644 --- a/drivers/usb/host/ehci-fsl.c +++ b/drivers/usb/host/ehci-fsl.c @@ -370,6 +370,15 @@ static int ehci_fsl_setup(struct usb_hcd *hcd) /* EHCI registers start at offset 0x100 */ ehci->caps = hcd->regs + 0x100; +#ifdef CONFIG_PPC_83xx + /* + * Deal with MPC834X that need port power to be cycled after the power + * fault condition is removed. Otherwise the state machine does not + * reflect PORTSC[CSC] correctly. + */ + ehci->need_oc_pp_cycle = 1; +#endif + hcd->has_tt = 1; retval = ehci_setup(hcd); diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c index 7b04ca96b58..9ab4a4d9768 100644 --- a/drivers/usb/host/ehci-hub.c +++ b/drivers/usb/host/ehci-hub.c @@ -840,7 +840,8 @@ static int ehci_hub_control ( * power switching; they're allowed to just limit the * current. khubd will turn the power back on. */ - if ((temp & PORT_OC) && HCS_PPC(ehci->hcs_params)) { + if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle)) + && HCS_PPC(ehci->hcs_params)) { ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_POWER), status_reg); diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h index e6669995099..7c978b23520 100644 --- a/drivers/usb/host/ehci.h +++ b/drivers/usb/host/ehci.h @@ -199,6 +199,7 @@ struct ehci_hcd { /* one per controller */ unsigned use_dummy_qh:1; /* AMD Frame List table quirk*/ unsigned has_synopsys_hc_bug:1; /* Synopsys HC */ unsigned frame_index_bug:1; /* MosChip (AKA NetMos) */ + unsigned need_oc_pp_cycle:1; /* MPC834X port power */ /* required for usb32 quirk */ #define OHCI_CTRL_HCFS (3 << 6) -- 2.41.0