Commit 930981b4 authored by Chunfeng Yun's avatar Chunfeng Yun Committed by Vinod Koul
Browse files

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: default avatarChunfeng Yun <chunfeng.yun@mediatek.com>
Reviewed-by: default avatarAngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220914060746.10004-3-chunfeng.yun@mediatek.com


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent 54511f20

drivers/phy/mediatek/phy-mtk-tphy.c

+10 −0
Original line number Diff line number Diff line
@@ -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 */