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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>
This commit is contained in:
Chunfeng Yun 2022-09-14 14:07:42 +08:00 committed by Vinod Koul
parent 54511f207c
commit 930981b425
1 changed files with 10 additions and 0 deletions
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10
drivers/phy/mediatek/phy-mtk-tphy.c
View File

@ -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 */