diff options
| author | Joshua Stein <jcs@cvs.openbsd.org> | 2016-09-01 09:41:21 +0000 |
|---|---|---|
| committer | Joshua Stein <jcs@cvs.openbsd.org> | 2016-09-01 09:41:21 +0000 |
| commit | c08fe93a6f42b3bb433a2d0eb6d67f9538c62037 (patch) | |
| tree | b72db066390cd425857614afe7aa44d0ed056fff | |
| parent | 77202025ddeec8906404f580766c68a06f950256 (diff) | |
for broadwell HIDs, apply a magic write found in linux that is
required in order to talk to certain i2c slave devices behind dwiic
| -rw-r--r-- | sys/dev/acpi/dwiic.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/sys/dev/acpi/dwiic.c b/sys/dev/acpi/dwiic.c index 7d796192c4e..d3a7853f68d 100644 --- a/sys/dev/acpi/dwiic.c +++ b/sys/dev/acpi/dwiic.c @@ -1,4 +1,4 @@ -/* $OpenBSD: dwiic.c,v 1.18 2016/09/01 09:39:54 jcs Exp $ */ +/* $OpenBSD: dwiic.c,v 1.19 2016/09/01 09:41:20 jcs Exp $ */ /* * Synopsys DesignWare I2C controller * @@ -135,6 +135,7 @@ struct dwiic_softc { struct acpi_softc *sc_acpi; struct aml_node *sc_devnode; + char sc_hid[16]; void *sc_ih; struct i2cbus_attach_args sc_iba; @@ -240,6 +241,7 @@ dwiic_attach(struct device *parent, struct device *self, void *aux) sc->sc_acpi = (struct acpi_softc *)parent; sc->sc_devnode = aa->aaa_node; + memcpy(&sc->sc_hid, aa->aaa_dev, sizeof(sc->sc_hid)); printf(": %s", sc->sc_devnode->name); @@ -760,6 +762,18 @@ dwiic_acpi_power(struct dwiic_softc *sc, int power) DELAY(10000); /* 10 milliseconds */ } else DPRINTF(("%s: no %s method\n", sc->sc_dev.dv_xname, ps)); + + if (strcmp(sc->sc_hid, "INT3432") == 0 || + strcmp(sc->sc_hid, "INT3433") == 0) { + /* + * XXX: broadwell i2c devices may need this for initial power + * up and/or after s3 resume. + * + * linux does this write via LPSS -> clk_register_gate -> + * clk_gate_enable -> clk_gate_endisable -> clk_writel + */ + dwiic_write(sc, 0x800, 1); + } } int |