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Interrupt-driven I/O seems to completely go off the rails, at least 

on AllWinner implementations of this controller, so force polled mode
for now.
This commit is contained in:
thorpej 2020-02-15 23:42:01 +00:00
parent 86465dbe5a
commit 839cd8df19
1 changed files with 9 additions and 2 deletions
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11
sys/dev/i2c/gttwsi_core.c
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@ -1,4 +1,4 @@
/* $NetBSD: gttwsi_core.c,v 1.15 2020/01/13 12:53:46 thorpej Exp $ */ /* $NetBSD: gttwsi_core.c,v 1.16 2020/02/15 23:42:01 thorpej Exp $ */
/* /*
* Copyright (c) 2008 Eiji Kawauchi. * Copyright (c) 2008 Eiji Kawauchi.
* All rights reserved. * All rights reserved.
@ -66,7 +66,7 @@
*/ */
#include <sys/cdefs.h> #include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: gttwsi_core.c,v 1.15 2020/01/13 12:53:46 thorpej Exp $"); __KERNEL_RCSID(0, "$NetBSD: gttwsi_core.c,v 1.16 2020/02/15 23:42:01 thorpej Exp $");
#include "locators.h" #include "locators.h"
#include <sys/param.h> #include <sys/param.h>
@ -317,6 +317,13 @@ gttwsi_wait(struct gttwsi_softc *sc, uint32_t control, uint32_t expect,
uint32_t status; uint32_t status;
int timo, error = 0; int timo, error = 0;
/*
* XXX Interrupt-driven mode seems to be horribly broken,
* XXX at least on AllWinner implementations. Force polled
* XXX mode for now.
*/
flags |= I2C_F_POLL;
DELAY(5); DELAY(5);
if (!(flags & I2C_F_POLL)) if (!(flags & I2C_F_POLL))
control |= CONTROL_INTEN; control |= CONTROL_INTEN;