Date: Mon, 09 Sep 2019 21:13:00 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 240339] [ig4] I2C2 (touchpad bus) broken on the Google Pixelbook (Sunrise Point PCH) Message-ID: <bug-240339-227-PV93x0F1ME@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-240339-227@https.bugs.freebsd.org/bugzilla/> References: <bug-240339-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240339 Vladimir Kondratyev <wulf@freebsd.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |wulf@freebsd.org --- Comment #1 from Vladimir Kondratyev <wulf@freebsd.org> --- (In reply to Greg V from comment #0) Skylake's initialization currently broken due to SDA_HOLD register set too low. Try following patch (power off is needed after install): --- a/sys/dev/ichiic/ig4_iic.c +++ b/sys/dev/ichiic/ig4_iic.c @@ -590,6 +590,7 @@ ig4iic_attach(ig4iic_softc_t *sc) reg_write(sc, IG4_REG_SS_SCL_LCNT, 125); reg_write(sc, IG4_REG_FS_SCL_HCNT, 100); reg_write(sc, IG4_REG_FS_SCL_LCNT, 125); + reg_write(sc, IG4_REG_SDA_HOLD, 28); /* * Use a threshold of 1 so we get interrupted on each character, -- You are receiving this mail because: You are the assignee for the bug.
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