mediatek: re-add u3phy2 phy-switch patch

This patch is required for pcie@2,0 in mt7623 to work. The patch was originally
added in kernel 4.14, but it has not been ported to 4.19 and later.

Fixes: FS#3217
Tested-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Sungbo Eo <mans0n@gorani.run>

diff --git a/target/linux/mediatek/patches-5.4/0226-phy-phy-mtk-tphy-Add-hifsys-support.patch b/target/linux/mediatek/patches-5.4/0226-phy-phy-mtk-tphy-Add-hifsys-support.patch
new file mode 100644 (file)
index 0000000..f2647e8
--- /dev/null
+++ b/target/linux/mediatek/patches-5.4/0226-phy-phy-mtk-tphy-Add-hifsys-support.patch
@@ -0,0 +1,66 @@
+From 28f9a5e2a3f5441ab5594669ed82da11e32277a9 Mon Sep 17 00:00:00 2001
+From: Kristian Evensen <kristian.evensen@gmail.com>
+Date: Mon, 30 Apr 2018 14:38:01 +0200
+Subject: [PATCH] phy: phy-mtk-tphy: Add hifsys-support
+
+---
+ drivers/phy/mediatek/phy-mtk-tphy.c | 20 ++++++++++++++++++++
+ 1 file changed, 20 insertions(+)
+
+--- a/drivers/phy/mediatek/phy-mtk-tphy.c
++++ b/drivers/phy/mediatek/phy-mtk-tphy.c
+@@ -15,6 +15,8 @@
+ #include <linux/of_device.h>
+ #include <linux/phy/phy.h>
+ #include <linux/platform_device.h>
++#include <linux/mfd/syscon.h>
++#include <linux/regmap.h>
+ 
+ /* version V1 sub-banks offset base address */
+ /* banks shared by multiple phys */
+@@ -263,6 +265,9 @@
+ #define RG_CDR_BIRLTD0_GEN3_MSK               GENMASK(4, 0)
+ #define RG_CDR_BIRLTD0_GEN3_VAL(x)    (0x1f & (x))
+ 
++#define HIF_SYSCFG1                   0x14
++#define HIF_SYSCFG1_PHY2_MASK         (0x3 << 20)
++
+ enum mtk_phy_version {
+       MTK_PHY_V1 = 1,
+       MTK_PHY_V2,
+@@ -310,6 +315,7 @@ struct mtk_tphy {
+       struct clk *u3phya_ref; /* reference clock of usb3 anolog phy */
+       const struct mtk_phy_pdata *pdata;
+       struct mtk_phy_instance **phys;
++      struct regmap *hif;
+       int nphys;
+       int src_ref_clk; /* MHZ, reference clock for slew rate calibrate */
+       int src_coef; /* coefficient for slew rate calibrate */
+@@ -629,6 +635,10 @@ static void pcie_phy_instance_init(struc
+       if (tphy->pdata->version != MTK_PHY_V1)
+               return;
+ 
++      if (tphy->hif)
++              regmap_update_bits(tphy->hif, HIF_SYSCFG1,
++                                 HIF_SYSCFG1_PHY2_MASK, 0);
++
+       tmp = readl(u3_banks->phya + U3P_U3_PHYA_DA_REG0);
+       tmp &= ~(P3A_RG_XTAL_EXT_PE1H | P3A_RG_XTAL_EXT_PE2H);
+       tmp |= P3A_RG_XTAL_EXT_PE1H_VAL(0x2) | P3A_RG_XTAL_EXT_PE2H_VAL(0x2);
+@@ -1114,6 +1124,16 @@ static int mtk_tphy_probe(struct platfor
+               &tphy->src_ref_clk);
+       device_property_read_u32(dev, "mediatek,src-coef", &tphy->src_coef);
+ 
++      if (of_find_property(np, "mediatek,phy-switch", NULL)) {
++              tphy->hif = syscon_regmap_lookup_by_phandle(np,
++                                                          "mediatek,phy-switch");
++              if (IS_ERR(tphy->hif)) {
++                      dev_err(&pdev->dev,
++                              "missing \"mediatek,phy-switch\" phandle\n");
++                      return PTR_ERR(tphy->hif);
++              }
++      }
++
+       port = 0;
+       for_each_child_of_node(np, child_np) {
+               struct mtk_phy_instance *instance;