diff options
author | Jakob Unterwurzacher <jakob.unterwurzacher@theobroma-systems.com> | 2019-05-21 17:28:20 +0200 |
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committer | Jakob Unterwurzacher <jakob.unterwurzacher@theobroma-systems.com> | 2019-05-21 17:29:04 +0200 |
commit | d9bb659938cfeec97b01edf303f416d82f3adbea (patch) | |
tree | f039473198f823c0a9523383ed7efc3c4185f41a | |
parent | 6e36024ad688bfa13289c137799aecc4bbfc9604 (diff) |
phy: rockchip-emmc: lower drive impedance to 33 ohm
Improves signal integrity on the RK3399-Q7 Puma.
Signed-off-by: Jakob Unterwurzacher <jakob.unterwurzacher@theobroma-systems.com>
-rw-r--r-- | drivers/phy/rockchip/phy-rockchip-emmc.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/phy/rockchip/phy-rockchip-emmc.c b/drivers/phy/rockchip/phy-rockchip-emmc.c index b69a0a796473..0747b7807edf 100644 --- a/drivers/phy/rockchip/phy-rockchip-emmc.c +++ b/drivers/phy/rockchip/phy-rockchip-emmc.c @@ -286,10 +286,10 @@ static int rockchip_emmc_phy_power_on(struct phy *phy) { struct rockchip_emmc_phy *rk_phy = phy_get_drvdata(phy); - /* Drive impedance: 50 Ohm */ + /* Drive impedance: 33 Ohm */ regmap_write(rk_phy->reg_base, rk_phy->reg_offset + GRF_EMMCPHY_CON6, - HIWORD_UPDATE(PHYCTRL_DR_50OHM, + HIWORD_UPDATE(PHYCTRL_DR_33OHM, PHYCTRL_DR_MASK, PHYCTRL_DR_SHIFT)); |