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Commit 4beadc4e authored by Hemant Kumar's avatar Hemant Kumar Committed by Gerrit - the friendly Code Review server
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usb: phy: Add HS PHY tuning parameters to debugfs for SNPS PHY 



This allows tuning of PHY parameters using debugfs. This helps in
coming up with appropriate parameter values in electrical compliance
testing.

Change-Id: Iaa65d33ee9e0483bcb753dc98257997ae1dffa2e
Signed-off-by: default avatarHemant Kumar <hemantk@codeaurora.org>
parent 1d8bd378

drivers/usb/phy/phy-msm-snps-hs.c

+42 −0
Original line number Diff line number Diff line
@@ -62,8 +62,12 @@ 


#define TXPREEMPAMPTUNE0(x)			(x << 6)

#define TXPREEMPAMPTUNE0_MASK			(BIT(7) | BIT(6))

#define USB2PHY_USB_PHY_PARAMETER_OVERRIDE_X0	0x6c

#define USB2PHY_USB_PHY_PARAMETER_OVERRIDE_X1	0x70

#define USB2PHY_USB_PHY_PARAMETER_OVERRIDE_X2	0x74

#define USB2PHY_USB_PHY_PARAMETER_OVERRIDE_X3	0x78

#define TXVREFTUNE0_MASK			0xF

#define PARAM_OVRD_MASK			0xFF



#define USB_HSPHY_3P3_VOL_MIN			3050000 /* uV */

#define USB_HSPHY_3P3_VOL_MAX			3300000 /* uV */
@@ -109,6 +113,10 @@ struct msm_hsphy { 
	struct dentry		*root;

	u8			txvref_tune0;

	u8			pre_emphasis;

	u8			param_ovrd0;

	u8			param_ovrd1;

	u8			param_ovrd2;

	u8			param_ovrd3;

};



static void msm_hsphy_enable_clocks(struct msm_hsphy *phy, bool on)
@@ -388,6 +396,36 @@ static int msm_hsphy_init(struct usb_phy *uphy) 
			TXVREFTUNE0_MASK, val);

	}



	if (phy->param_ovrd0) {

		msm_usb_write_readback(phy->base,

			USB2PHY_USB_PHY_PARAMETER_OVERRIDE_X0,

			PARAM_OVRD_MASK, phy->param_ovrd0);

	}



	if (phy->param_ovrd1) {

		msm_usb_write_readback(phy->base,

			USB2PHY_USB_PHY_PARAMETER_OVERRIDE_X1,

			PARAM_OVRD_MASK, phy->param_ovrd1);

	}



	if (phy->param_ovrd2) {

		msm_usb_write_readback(phy->base,

			USB2PHY_USB_PHY_PARAMETER_OVERRIDE_X2,

			PARAM_OVRD_MASK, phy->param_ovrd2);

	}



	if (phy->param_ovrd3) {

		msm_usb_write_readback(phy->base,

			USB2PHY_USB_PHY_PARAMETER_OVERRIDE_X3,

			PARAM_OVRD_MASK, phy->param_ovrd3);

	}



	dev_dbg(uphy->dev, "x0:%08x x1:%08x x2:%08x x3:%08x\n",

	readl_relaxed(phy->base + USB2PHY_USB_PHY_PARAMETER_OVERRIDE_X0),

	readl_relaxed(phy->base + USB2PHY_USB_PHY_PARAMETER_OVERRIDE_X1),

	readl_relaxed(phy->base + USB2PHY_USB_PHY_PARAMETER_OVERRIDE_X2),

	readl_relaxed(phy->base + USB2PHY_USB_PHY_PARAMETER_OVERRIDE_X3));



	if (phy->phy_rcal_reg) {

		rcal_code = readl_relaxed(phy->phy_rcal_reg) & phy->rcal_mask;
@@ -607,6 +645,10 @@ static void msm_hsphy_create_debugfs(struct msm_hsphy *phy) 
	phy->root = debugfs_create_dir(dev_name(phy->phy.dev), NULL);

	debugfs_create_x8("pre_emphasis", 0644, phy->root, &phy->pre_emphasis);

	debugfs_create_x8("txvref_tune0", 0644, phy->root, &phy->txvref_tune0);

	debugfs_create_x8("param_ovrd0", 0644, phy->root, &phy->param_ovrd0);

	debugfs_create_x8("param_ovrd1", 0644, phy->root, &phy->param_ovrd1);

	debugfs_create_x8("param_ovrd2", 0644, phy->root, &phy->param_ovrd2);

	debugfs_create_x8("param_ovrd3", 0644, phy->root, &phy->param_ovrd3);

}



static int msm_hsphy_probe(struct platform_device *pdev)