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| author | Chunfeng Yun <chunfeng.yun@mediatek.com> | 2022-09-14 08:07:42 +0200 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2022-09-20 08:29:05 +0200 |
| commit | 930981b425d94fc09e7597779cda870b1838bc99 (patch) | |
| tree | c3ce238d7b5bd79a2b576649465a423f59483e69 /drivers/phy | |
| parent | dt-bindings: phy: mediatek,tphy: add property to set pre-emphasis (diff) | |
| download | linux-930981b425d94fc09e7597779cda870b1838bc99.tar.xz linux-930981b425d94fc09e7597779cda870b1838bc99.zip | |
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 <chunfeng.yun@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220914060746.10004-3-chunfeng.yun@mediatek.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/phy')
| -rw-r--r-- | drivers/phy/mediatek/phy-mtk-tphy.c | 10 |
1 files changed, 10 insertions, 0 deletions
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 */ |