[src/trunk]: src/sys/arch/arm/rockchip Set drive strength and output tap delay

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/6b30fdf9b194
branches:  trunk
changeset: 997572:6b30fdf9b194
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Wed Mar 13 10:28:37 2019 +0000

description:
Set drive strength and output tap delay

diffstat:

 sys/arch/arm/rockchip/rk_emmcphy.c |  16 ++++++++++++++--
 1 files changed, 14 insertions(+), 2 deletions(-)

diffs (37 lines):

diff -r 2a33be9e9c19 -r 6b30fdf9b194 sys/arch/arm/rockchip/rk_emmcphy.c
--- a/sys/arch/arm/rockchip/rk_emmcphy.c        Wed Mar 13 10:08:02 2019 +0000
+++ b/sys/arch/arm/rockchip/rk_emmcphy.c        Wed Mar 13 10:28:37 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: rk_emmcphy.c,v 1.2 2019/03/10 19:47:03 jmcneill Exp $ */
+/* $NetBSD: rk_emmcphy.c,v 1.3 2019/03/13 10:28:37 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2019 Jared McNeill <jmcneill%invisible.ca@localhost>
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: rk_emmcphy.c,v 1.2 2019/03/10 19:47:03 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: rk_emmcphy.c,v 1.3 2019/03/13 10:28:37 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/bus.h>
@@ -139,6 +139,18 @@
 
        syscon_lock(sc->sc_syscon);
 
+       if (enable) {
+               /* Drive strength */
+               mask = PHYCTRL_DR_TY;
+               val = __SHIFTIN(0, PHYCTRL_DR_TY);
+               WR4(sc, GRF_EMMCPHY_CON6, (mask << 16) | val);
+
+               /* Enable output tap delay */
+               mask = PHYCTRL_OTAPDLYENA | PHYCTRL_OTAPDLYSEL;
+               val = PHYCTRL_OTAPDLYENA | __SHIFTIN(4, PHYCTRL_OTAPDLYSEL);
+               WR4(sc, GRF_EMMCPHY_CON0, (mask << 16) | val);
+       }
+
        /* Power down PHY and disable DLL before making changes */
        mask = PHYCTRL_ENDLL | PHYCTRL_PDB;
        val = 0;