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Commit c2986399 authored by Azhar Shaikh's avatar Azhar Shaikh Committed by Gerrit - the friendly Code Review server
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usb: phy: qusb: Update TUNE2 parameter for better compliance results 



Update the TUNE2 parameter by adjusting the programmed tune2 value
with the correction value, if mentioned in dtsi to improve
rise/fall times.

Change-Id: I93c4efb649a18b61df863826e88fe777da5d74fa
Signed-off-by: default avatarAzhar Shaikh <azhars@codeaurora.org>
parent 816587b4

Documentation/devicetree/bindings/usb/msm-phy.txt

+2 −0
Original line number Diff line number Diff line
@@ -177,6 +177,8 @@ Optional properties: 
 - qcom,hold-reset: Indicates that hold QUSB PHY into reset state.

 - qcom,enable-dpdm-pulsing: enables dp and dm pulsing for PMIC driver to

   perform charger detection.

 - qcom,tune2-efuse-correction: The value to be adjusted from the higher nibble of TUNE2

   for improved rise/fall times.



Example:

	qusb_phy: qusb@f9b39000 {

drivers/usb/phy/phy-msm-qusb.c

+15 −0
Original line number Diff line number Diff line
@@ -140,6 +140,7 @@ struct qusb_phy { 
	u32			tune2_val;

	int			tune2_efuse_bit_pos;

	int			tune2_efuse_num_of_bits;

	int			tune2_efuse_correction;



	bool			power_enabled;

	bool			clocks_enabled;
@@ -558,6 +559,17 @@ static void qusb_phy_get_tune2_param(struct qusb_phy *qphy) 
	qphy->tune2_val = TUNE2_HIGH_NIBBLE_VAL(qphy->tune2_val,

				qphy->tune2_efuse_bit_pos, bit_mask);



	/* Update higher nibble of TUNE2 value for better rise/fall times */

	if (qphy->tune2_efuse_correction) {

		if (qphy->tune2_efuse_correction > 5 ||

				qphy->tune2_efuse_correction < -10)

			pr_warn("Correction value is out of range : %d\n",

					qphy->tune2_efuse_correction);

		else

			qphy->tune2_val = qphy->tune2_val +

						qphy->tune2_efuse_correction;

	}



	if (!qphy->tune2_val)

		qphy->tune2_val = TUNE2_DEFAULT_HIGH_NIBBLE;
@@ -1039,6 +1051,9 @@ static int qusb_phy_probe(struct platform_device *pdev) 
						"qcom,tune2-efuse-num-bits",

						&qphy->tune2_efuse_num_of_bits);

			}

			of_property_read_u32(dev->of_node,

						"qcom,tune2-efuse-correction",

						&qphy->tune2_efuse_correction);



			if (ret) {

				dev_err(dev, "DT Value for tune2 efuse is invalid.\n");