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dwc3: uncondinationally enable Host IN Auto Retry

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Enable dwc3's auto retry feature. For IN transfers with crc errors
or internal overruns this will make the host reply with a
non-terminating retry ACK.  I believe the hope was to improve
reliability after seeing occasional hiccups.

Obtained from:	an old debugging patch
MFC after:	2 weeks
Reviewed by:	mw
Differential Revision: https://reviews.freebsd.org/D35698
This commit is contained in:
Bjoern A. Zeeb 2022-07-02 19:14:39 +00:00
parent 0084212bfd
commit cec0a5ec6b
2 changed files with 10 additions and 0 deletions
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9
sys/dev/usb/controller/dwc3.c
View file

@ -209,6 +209,15 @@ snps_dwc3_configure_host(struct snps_dwc3_softc *sc)
reg &= ~DWC3_GCTL_PRTCAPDIR_MASK;
reg |= DWC3_GCTL_PRTCAPDIR_HOST;
DWC3_WRITE(sc, DWC3_GCTL, reg);
/*
* Enable the Host IN Auto Retry feature, making the
* host respond with a non-terminating retry ACK.
* XXX If we ever support more than host mode this needs a dr_mode check.
*/
reg = DWC3_READ(sc, DWC3_GUCTL);
reg |= DWC3_GUCTL_HOST_AUTO_RETRY;
DWC3_WRITE(sc, DWC3_GUCTL, reg);
}
static void

1
sys/dev/usb/controller/dwc3.h
View file

@ -54,6 +54,7 @@
#define DWC3_GGPIO 0xc124
#define DWC3_GUID 0xc128
#define DWC3_GUCTL 0xc12C
#define DWC3_GUCTL_HOST_AUTO_RETRY (1 << 14)
#define DWC3_GBUSERRADDRLO 0xc130
#define DWC3_GBUSERRADDRHI 0xc134
#define DWC3_GPRTBIMAPLO 0xc138