From 930981b425d94fc09e7597779cda870b1838bc99 Mon Sep 17 00:00:00 2001 From: Chunfeng Yun Date: Wed, 14 Sep 2022 14:07:42 +0800 Subject: phy: phy-mtk-tphy: add property to set pre-emphasis Add a property to set usb2 phy's pre-emphasis, it's disabled by default on some SoCs. Signed-off-by: Chunfeng Yun Reviewed-by: AngeloGioacchino Del Regno Link: https://lore.kernel.org/r/20220914060746.10004-3-chunfeng.yun@mediatek.com Signed-off-by: Vinod Koul --- drivers/phy/mediatek/phy-mtk-tphy.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'drivers/phy/mediatek') diff --git a/drivers/phy/mediatek/phy-mtk-tphy.c b/drivers/phy/mediatek/phy-mtk-tphy.c index 8ee7682b8e93..986fde0f63a0 100644 --- a/drivers/phy/mediatek/phy-mtk-tphy.c +++ b/drivers/phy/mediatek/phy-mtk-tphy.c @@ -72,6 +72,8 @@ #define PA5_RG_U2_HS_100U_U3_EN BIT(11) #define U3P_USBPHYACR6 0x018 +#define PA6_RG_U2_PRE_EMP GENMASK(31, 30) +#define PA6_RG_U2_PRE_EMP_VAL(x) ((0x3 & (x)) << 30) #define PA6_RG_U2_BC11_SW_EN BIT(23) #define PA6_RG_U2_OTG_VBUSCMP_EN BIT(20) #define PA6_RG_U2_DISCTH GENMASK(7, 4) @@ -370,6 +372,7 @@ struct mtk_phy_instance { int eye_term; int intr; int discth; + int pre_emphasis; bool bc12_en; }; @@ -841,10 +844,13 @@ static void phy_parse_property(struct mtk_tphy *tphy, &instance->intr); device_property_read_u32(dev, "mediatek,discth", &instance->discth); + device_property_read_u32(dev, "mediatek,pre-emphasis", + &instance->pre_emphasis); dev_dbg(dev, "bc12:%d, src:%d, vrt:%d, term:%d, intr:%d, disc:%d\n", instance->bc12_en, instance->eye_src, instance->eye_vrt, instance->eye_term, instance->intr, instance->discth); + dev_dbg(dev, "pre-emp:%d\n", instance->pre_emphasis); } static void u2_phy_props_set(struct mtk_tphy *tphy, @@ -875,6 +881,10 @@ static void u2_phy_props_set(struct mtk_tphy *tphy, if (instance->discth) mtk_phy_update_bits(com + U3P_USBPHYACR6, PA6_RG_U2_DISCTH, PA6_RG_U2_DISCTH_VAL(instance->discth)); + + if (instance->pre_emphasis) + mtk_phy_update_bits(com + U3P_USBPHYACR6, PA6_RG_U2_PRE_EMP, + PA6_RG_U2_PRE_EMP_VAL(instance->pre_emphasis)); } /* type switch for usb3/pcie/sgmii/sata */ -- cgit v1.2.3