Re: [PATCH 5/6] phy: phy-mtk-tphy: add support efuse setting

[Chunfeng Yun <chunfeng.yun@mediatek.com>]

On Thu, 2021-11-25 at 10:42 +0530, Vinod Koul wrote:
> On 24-11-21, 14:54, Chunfeng Yun wrote:
> > On Mon, 2021-11-22 at 17:05 +0530, Vinod Koul wrote:
> > > On 07-11-21, 15:56, Chunfeng Yun wrote:
> > > > Due to some SoCs have a bit shift issue that will drop a bit
> > > > for
> > > > usb3
> > > > phy or pcie phy, fix it by adding software efuse reading and
> > > > setting,
> > > > but only support it optionally for versoin 2/3.
> > > 
> > > s/versoin/version
> > 
> > Ok
> > > 
> > > > 
> > > > Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
> > > > ---
> > > >  drivers/phy/mediatek/phy-mtk-tphy.c | 162
> > > > ++++++++++++++++++++++++++++
> > > >  1 file changed, 162 insertions(+)
> > > > 
> > > > diff --git a/drivers/phy/mediatek/phy-mtk-tphy.c
> > > > b/drivers/phy/mediatek/phy-mtk-tphy.c
> > > > index cdcef865fe9e..3b5b1c266595 100644
> > > > --- a/drivers/phy/mediatek/phy-mtk-tphy.c
> > > > +++ b/drivers/phy/mediatek/phy-mtk-tphy.c
> > > > @@ -12,6 +12,7 @@
> > > >  #include <linux/iopoll.h>
> > > >  #include <linux/mfd/syscon.h>
> > > >  #include <linux/module.h>
> > > > +#include <linux/nvmem-consumer.h>
> > > >  #include <linux/of_address.h>
> > > >  #include <linux/of_device.h>
> > > >  #include <linux/phy/phy.h>
> > > > @@ -41,6 +42,9 @@
> > > >  #define SSUSB_SIFSLV_V2_U3PHYD		0x200
> > > >  #define SSUSB_SIFSLV_V2_U3PHYA		0x400
> > > >  
> > > > +#define U3P_MISC_REG1		0x04
> > > > +#define MR1_EFUSE_AUTO_LOAD_DIS		BIT(6)
> > > > +
> > > >  #define U3P_USBPHYACR0		0x000
> > > >  #define PA0_RG_U2PLL_FORCE_ON		BIT(15)
> > > >  #define PA0_USB20_PLL_PREDIV		GENMASK(7, 6)
> > > > @@ -133,6 +137,8 @@
> > > >  #define P3C_RG_SWRST_U3_PHYD_FORCE_EN	BIT(24)
> > > >  
> > > >  #define U3P_U3_PHYA_REG0	0x000
> > > > +#define P3A_RG_IEXT_INTR		GENMASK(15, 10)
> > > > +#define P3A_RG_IEXT_INTR_VAL(x)		((0x3f & (x))
> > > > << 10)
> > > >  #define P3A_RG_CLKDRV_OFF		GENMASK(3, 2)
> > > >  #define P3A_RG_CLKDRV_OFF_VAL(x)	((0x3 & (x)) << 2)
> > > >  
> > > > @@ -187,6 +193,19 @@
> > > >  #define P3D_RG_FWAKE_TH		GENMASK(21, 16)
> > > >  #define P3D_RG_FWAKE_TH_VAL(x)	((0x3f & (x)) << 16)
> > > >  
> > > > +#define U3P_U3_PHYD_IMPCAL0		0x010
> > > > +#define P3D_RG_FORCE_TX_IMPEL		BIT(31)
> > > > +#define P3D_RG_TX_IMPEL			GENMASK(28, 24)
> > > > +#define P3D_RG_TX_IMPEL_VAL(x)		((0x1f & (x)) << 24)
> > > > +
> > > > +#define U3P_U3_PHYD_IMPCAL1		0x014
> > > > +#define P3D_RG_FORCE_RX_IMPEL		BIT(31)
> > > > +#define P3D_RG_RX_IMPEL			GENMASK(28, 24)
> > > > +#define P3D_RG_RX_IMPEL_VAL(x)		((0x1f & (x)) << 24)
> > > > +
> > > > +#define U3P_U3_PHYD_RSV			0x054
> > > > +#define P3D_RG_EFUSE_AUTO_LOAD_DIS	BIT(12)
> > > > +
> > > >  #define U3P_U3_PHYD_CDR1		0x05c
> > > >  #define P3D_RG_CDR_BIR_LTD1		GENMASK(28, 24)
> > > >  #define P3D_RG_CDR_BIR_LTD1_VAL(x)	((0x1f & (x)) << 24)
> > > > @@ -307,6 +326,11 @@ struct mtk_phy_pdata {
> > > >  	 * 48M PLL, fix it by switching PLL to 26M from default
> > > > 48M
> > > >  	 */
> > > >  	bool sw_pll_48m_to_26m;
> > > > +	/*
> > > > +	 * Some SoCs (e.g. mt8195) drop a bit when use auto
> > > > load efuse,
> > > > +	 * support sw way, also support it for v2/v3
> > > > optionally.
> > > > +	 */
> > > > +	bool sw_efuse_supported;
> > > >  	enum mtk_phy_version version;
> > > >  };
> > > >  
> > > > @@ -336,6 +360,10 @@ struct mtk_phy_instance {
> > > >  	struct regmap *type_sw;
> > > >  	u32 type_sw_reg;
> > > >  	u32 type_sw_index;
> > > > +	u32 efuse_sw_en;
> > > > +	u32 efuse_intr;
> > > > +	u32 efuse_tx_imp;
> > > > +	u32 efuse_rx_imp;
> > > >  	int eye_src;
> > > >  	int eye_vrt;
> > > >  	int eye_term;
> > > > @@ -1040,6 +1068,130 @@ static int phy_type_set(struct
> > > > mtk_phy_instance *instance)
> > > >  	return 0;
> > > >  }
> > > >  
> > > > +static int phy_efuse_get(struct mtk_tphy *tphy, struct
> > > > mtk_phy_instance *instance)
> > > > +{
> > > > +	struct device *dev = &instance->phy->dev;
> > > > +	int ret = 0;
> > > > +
> > > > +	/* tphy v1 doesn't support sw efuse, skip it */
> > > > +	if (!tphy->pdata->sw_efuse_supported) {
> > > > +		instance->efuse_sw_en = 0;
> > > > +		return 0;
> > > > +	}
> > > > +
> > > > +	/* software efuse is optional */
> > > > +	instance->efuse_sw_en = device_property_read_bool(dev,
> > > > "nvmem-
> > > > cells");
> > > > +	if (!instance->efuse_sw_en)
> > > > +		return 0;
> > > > +
> > > > +	switch (instance->type) {
> > > > +	case PHY_TYPE_USB2:
> > > > +		ret = nvmem_cell_read_variable_le_u32(dev,
> > > > "intr",
> > > > &instance->efuse_intr);
> > > > +		if (ret) {
> > > > +			dev_err(dev, "fail to get u2 intr
> > > > efuse, %d\n",
> > > > ret);
> > > > +			break;
> > > > +		}
> > > > +
> > > > +		/* no efuse, ignore it */
> > > > +		if (!instance->efuse_intr) {
> > > > +			dev_warn(dev, "no u2 intr efuse, but
> > > > dts enable
> > > > it\n");
> > > > +			instance->efuse_sw_en = 0;
> > > > +			break;
> > > > +		}
> > > 
> > > What does this check do...? so a zero value is not valid..?
> > 
> > Yes, because it's also zero for SoC without efuse, prefer to use
> > default value instead.
> > 
> > > 
> > > > +
> > > > +		dev_info(dev, "u2 efuse - intr %x\n", instance-
> > > > > efuse_intr);
> > > 
> > > dev_dbg()?
> > 
> > We usually use HW auto load way, print this log can help to point
> > out
> > that it's specific SoC.
> 
> You can enable this print thru dynamic debug or enable debug prints
> when
> debugging, let us not spam message log
Ok, will use dev_dbg()
> 
> > 
> > > 
> > > > +		break;
> > > 
> > > empty line after break improves readability, pls add
> > 
> > Ok
> > > 
> > > > +	case PHY_TYPE_USB3:
> > > > +	case PHY_TYPE_PCIE:
> > > > +		ret = nvmem_cell_read_variable_le_u32(dev,
> > > > "intr",
> > > > &instance->efuse_intr);
> > > > +		if (ret) {
> > > > +			dev_err(dev, "fail to get u3 intr
> > > > efuse, %d\n",
> > > > ret);
> > > > +			break;
> > > > +		}
> > > 
> > > This seems to be common, why not read this before switch?
> > 
> > It's not used for SGMII or SATA, but not applied until now
> > 
> > > 
> > > > +
> > > > +		ret = nvmem_cell_read_variable_le_u32(dev,
> > > > "rx_imp",
> > > > &instance->efuse_rx_imp);
> > > > +		if (ret) {
> > > > +			dev_err(dev, "fail to get u3 rx_imp
> > > > efuse,
> > > > %d\n", ret);
> > > > +			break;
> > > > +		}
> > > > +
> > > > +		ret = nvmem_cell_read_variable_le_u32(dev,
> > > > "tx_imp",
> > > > &instance->efuse_tx_imp);
> > > > +		if (ret) {
> > > > +			dev_err(dev, "fail to get u3 tx_imp
> > > > efuse,
> > > > %d\n", ret);
> > > > +			break;
> > > > +		}
> > > > +
> > > > +		/* no efuse, ignore it */
> > > > +		if (!instance->efuse_intr &&
> > > > +		    !instance->efuse_rx_imp &&
> > > > +		    !instance->efuse_rx_imp) {
> > > > +			dev_warn(dev, "no u3 intr efuse, but
> > > > dts enable
> > > > it\n");
> > > > +			instance->efuse_sw_en = 0;
> > > > +			break;
> > > > +		}
> > > 
> > > again, zero values are not valid?
> > 
> > It's also zero for SoC without efuse, treat it as invalid value
> > 
> > > 
> > > > +
> > > > +		dev_info(dev, "u3 efuse - intr %x, rx_imp %x,
> > > > tx_imp
> > > > %x\n",
> > > > +			 instance->efuse_intr, instance-
> > > > >efuse_rx_imp,
> > > > +			 instance->efuse_tx_imp);
> > > 
> > > dbg pls
> > 
> > Ok
> > > 
> > > > +		break;
> > > > +	default:
> > > > +		dev_err(dev, "no sw efuse for type %d\n",
> > > > instance-
> > > > > type);
> > > > 
> > > > +		ret = -EINVAL;
> > > > +	}
> > > > +
> > > > +	return ret;
> > > > +}
> > > > +
> > > > +static void phy_efuse_set(struct mtk_phy_instance *instance)
> > > > +{
> > > > +	struct device *dev = &instance->phy->dev;
> > > > +	struct u2phy_banks *u2_banks = &instance->u2_banks;
> > > > +	struct u3phy_banks *u3_banks = &instance->u3_banks;
> > > > +	u32 tmp;
> > > > +
> > > > +	if (!instance->efuse_sw_en)
> > > > +		return;
> > > > +
> > > > +	switch (instance->type) {
> > > > +	case PHY_TYPE_USB2:
> > > > +		tmp = readl(u2_banks->misc + U3P_MISC_REG1);
> > > > +		tmp |= MR1_EFUSE_AUTO_LOAD_DIS;
> > > > +		writel(tmp, u2_banks->misc + U3P_MISC_REG1);
> > > > +
> > > > +		tmp = readl(u2_banks->com + U3P_USBPHYACR1);
> > > > +		tmp &= ~PA1_RG_INTR_CAL;
> > > > +		tmp |= PA1_RG_INTR_CAL_VAL(instance-
> > > > >efuse_intr);
> > > > +		writel(tmp, u2_banks->com + U3P_USBPHYACR1);
> > > > +		break;
> > > > +	case PHY_TYPE_USB3:
> > > > +	case PHY_TYPE_PCIE:
> > > > +		tmp = readl(u3_banks->phyd + U3P_U3_PHYD_RSV);
> > > > +		tmp |= P3D_RG_EFUSE_AUTO_LOAD_DIS;
> > > > +		writel(tmp, u3_banks->phyd + U3P_U3_PHYD_RSV);
> > > 
> > > add a updatel() macro and use this here and other places?
> > 
> > You mean add macro to set/clear bits?
> > If so, I need prepare another patch for this purpose
> 
> Sure, that would be nice
Ok
>