diff options
| author | Mark Kettenis <kettenis@cvs.openbsd.org> | 2018-12-31 21:24:38 +0000 |
|---|---|---|
| committer | Mark Kettenis <kettenis@cvs.openbsd.org> | 2018-12-31 21:24:38 +0000 |
| commit | d77e0d08ee49e8df7347872346624b22a27c70f5 (patch) | |
| tree | 76a817afc26c566d374d8839949d4b595006211f | |
| parent | e8835cc0b7138e3737c6b5ae4a2d8e624c82f843 (diff) | |
Force base clock to 50 MHz on Rockchip SoCs. This increases the chance that
we end up with an optimal clock frequency for SD and eMMC.
ok patrick@
| -rw-r--r-- | sys/dev/fdt/dwmmc.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/sys/dev/fdt/dwmmc.c b/sys/dev/fdt/dwmmc.c index 32c42c76694..7f576963412 100644 --- a/sys/dev/fdt/dwmmc.c +++ b/sys/dev/fdt/dwmmc.c @@ -1,4 +1,4 @@ -/* $OpenBSD: dwmmc.c,v 1.19 2018/08/27 20:13:16 kettenis Exp $ */ +/* $OpenBSD: dwmmc.c,v 1.20 2018/12/31 21:24:37 kettenis Exp $ */ /* * Copyright (c) 2017 Mark Kettenis * @@ -283,7 +283,7 @@ dwmmc_attach(struct device *parent, struct device *self, void *aux) struct dwmmc_softc *sc = (struct dwmmc_softc *)self; struct fdt_attach_args *faa = aux; struct sdmmcbus_attach_args saa; - uint32_t freq, div = 0; + uint32_t freq = 0, div = 0; uint32_t hcon, width; uint32_t fifoth; int error, timeout; @@ -345,7 +345,11 @@ dwmmc_attach(struct device *parent, struct device *self, void *aux) OF_is_compatible(faa->fa_node, "hisilicon,hi3670-dw-mshc")) div = 7; - freq = OF_getpropint(faa->fa_node, "clock-frequency", 0); + /* Force the base clock to 50MHz on Rockchip SoCs. */ + if (OF_is_compatible(faa->fa_node, "rockchip,rk3288-dw-mshc")) + freq = 50000000; + + freq = OF_getpropint(faa->fa_node, "clock-frequency", freq); if (freq > 0) clock_set_frequency(faa->fa_node, "ciu", (div + 1) * freq); |