phy: qcom: phy-qcom-m31: Update IPQ5332 M31 USB phy initialization sequence

commit 4a3556b upstream.

The current configuration used for the IPQ5332 M31 USB PHY fails the
Near End High Speed Signal Quality compliance test. To resolve this,
update the initialization sequence as specified in the Hardware Design
Document.

Fixes: 08e49af ("phy: qcom: Introduce M31 USB PHY driver")
Cc: [email protected]
Signed-off-by: Kathiravan Thirumoorthy <[email protected]>
Reviewed-by: Konrad Dybcio <[email protected]>
Link: https://lore.kernel.org/r/20250630-ipq5332_hsphy_complaince-v2-1-63621439ebdb@oss.qualcomm.com
Signed-off-by: Vinod Koul <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Kathiravan Thirumoorthy

drivers/phy/qualcomm/phy-qcom-m31.c

@@ -58,14 +58,16 @@
  #define USB2_0_TX_ENABLE		BIT(2)
 
 #define USB2PHY_USB_PHY_M31_XCFGI_4	0xc8
- #define HSTX_SLEW_RATE_565PS		GENMASK(1, 0)
+ #define HSTX_SLEW_RATE_400PS		GENMASK(2, 0)
  #define PLL_CHARGING_PUMP_CURRENT_35UA	GENMASK(4, 3)
  #define ODT_VALUE_38_02_OHM		GENMASK(7, 6)
 
 #define USB2PHY_USB_PHY_M31_XCFGI_5	0xcc
- #define ODT_VALUE_45_02_OHM		BIT(2)
  #define HSTX_PRE_EMPHASIS_LEVEL_0_55MA	BIT(0)
 
+#define USB2PHY_USB_PHY_M31_XCFGI_9	0xdc
+ #define HSTX_CURRENT_17_1MA_385MV	BIT(1)
+
 #define USB2PHY_USB_PHY_M31_XCFGI_11	0xe4
  #define XCFG_COARSE_TUNE_NUM		BIT(1)
  #define XCFG_FINE_TUNE_NUM		BIT(3)
@@ -164,7 +166,7 @@ static struct m31_phy_regs m31_ipq5332_regs[] = {
 	},
 	{
 		USB2PHY_USB_PHY_M31_XCFGI_4,
-		HSTX_SLEW_RATE_565PS | PLL_CHARGING_PUMP_CURRENT_35UA | ODT_VALUE_38_02_OHM,
+		HSTX_SLEW_RATE_400PS | PLL_CHARGING_PUMP_CURRENT_35UA | ODT_VALUE_38_02_OHM,
 		0
 	},
 	{
@@ -174,9 +176,13 @@ static struct m31_phy_regs m31_ipq5332_regs[] = {
 	},
 	{
 		USB2PHY_USB_PHY_M31_XCFGI_5,
-		ODT_VALUE_45_02_OHM | HSTX_PRE_EMPHASIS_LEVEL_0_55MA,
+		HSTX_PRE_EMPHASIS_LEVEL_0_55MA,
 		4
 	},
+	{
+		USB2PHY_USB_PHY_M31_XCFGI_9,
+		HSTX_CURRENT_17_1MA_385MV,
+	},
 	{
 		USB_PHY_UTMI_CTRL5,
 		0x0,