phy: phy-mtk-tphy: add a property for disconnect threshold

This is used to tune the threshold of disconnect, the index range
is [0, 15], the threshold voltage is about 400mV for 0, 700mV for
15, and the step is 20mV.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

diff --git a/drivers/phy/mediatek/phy-mtk-tphy.c b/drivers/phy/mediatek/phy-mtk-tphy.c
index cb2ed3b..5afe336 100644 (file)
--- a/drivers/phy/mediatek/phy-mtk-tphy.c
+++ b/drivers/phy/mediatek/phy-mtk-tphy.c
@@ -60,6 +60,8 @@
 #define U3P_USBPHYACR6         0x018
 #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)
+#define PA6_RG_U2_DISCTH_VAL(x)        ((0xf & (x)) << 4)
 #define PA6_RG_U2_SQTH         GENMASK(3, 0)
 #define PA6_RG_U2_SQTH_VAL(x)  (0xf & (x))
 
@@ -300,6 +302,7 @@ struct mtk_phy_instance {
        int eye_src;
        int eye_vrt;
        int eye_term;
+       int discth;
        bool bc12_en;
 };
 
@@ -850,9 +853,12 @@ static void phy_parse_property(struct mtk_tphy *tphy,
                                 &instance->eye_vrt);
        device_property_read_u32(dev, "mediatek,eye-term",
                                 &instance->eye_term);
-       dev_dbg(dev, "bc12:%d, src:%d, vrt:%d, term:%d\n",
+       device_property_read_u32(dev, "mediatek,discth",
+                                &instance->discth);
+       dev_dbg(dev, "bc12:%d, src:%d, vrt:%d, term:%d, disc:%d\n",
                instance->bc12_en, instance->eye_src,
-               instance->eye_vrt, instance->eye_term);
+               instance->eye_vrt, instance->eye_term,
+               instance->discth);
 }
 
 static void u2_phy_props_set(struct mtk_tphy *tphy,
@@ -888,6 +894,13 @@ static void u2_phy_props_set(struct mtk_tphy *tphy,
                tmp |= PA1_RG_TERM_SEL_VAL(instance->eye_term);
                writel(tmp, com + U3P_USBPHYACR1);
        }
+
+       if (instance->discth) {
+               tmp = readl(com + U3P_USBPHYACR6);
+               tmp &= ~PA6_RG_U2_DISCTH;
+               tmp |= PA6_RG_U2_DISCTH_VAL(instance->discth);
+               writel(tmp, com + U3P_USBPHYACR6);
+       }
 }
 
 static int mtk_phy_init(struct phy *phy)