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Date: Wed, 27 Aug 2014 10:58:21 +0900
From: Jingoo Han <jg1.han@...sung.com>
To: 'Vivek Gautam' <gautam.vivek@...sung.com>,
linux-usb@...r.kernel.org
Cc: linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
gregkh@...uxfoundation.org, kishon@...com, kgene.kim@...sung.com,
mathias.nyman@...el.com, stern@...land.harvard.edu,
sergei.shtylyov@...entembedded.com,
heikki.krogerus@...ux.intel.com, balbi@...com,
'Jingoo Han' <jg1.han@...sung.com>
Subject: Re: [PATCH v5 4/4] phy: exynos5-usbdrd: Calibrate LOS levels for
exynos5420/5800
On Thursday, August 21, 2014 11:55 PM, Vivek Gautam wrote:
>
> Adding phy calibrate callback, which facilitates setting certain
> PHY settings post initialization of the PHY controller.
> Exynos5420 and Exynos5800 have 28nm USB 3.0 DRD PHY for which
> the Loss-of-Signal (LOS) Detector Threshold Level as well as
> Tx-Vboost-Level should be controlled for Super-Speed operations.
>
> Additionally set proper time to wait for RxDetect measurement,
> for desired PHY reference clock, so as to solve issue with enumeration
> of few USB 3.0 devices, like Samsung SUM-TSB16S 3.0 USB drive
> on the controller.
> We are using CR_port for this purpose to send required data
> to override the LOS values.
>
> On testing with USB 3.0 devices on USB 3.0 port present on
> SMDK5420, and peach-pit boards should see following message:
> usb 2-1: new SuperSpeed USB device number 2 using xhci-hcd
>
> and without this patch, should see below shown message:
> usb 1-1: new high-speed USB device number 2 using xhci-hcd
>
> Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
> ---
> drivers/phy/phy-exynos5-usbdrd.c | 169 ++++++++++++++++++++++++++++++++++++++
> 1 file changed, 169 insertions(+)
>
> diff --git a/drivers/phy/phy-exynos5-usbdrd.c b/drivers/phy/phy-exynos5-usbdrd.c
> index 47f47fe..fa13784 100644
> --- a/drivers/phy/phy-exynos5-usbdrd.c
> +++ b/drivers/phy/phy-exynos5-usbdrd.c
> @@ -89,8 +89,20 @@
> #define PHYCLKRST_COMMONONN BIT(0)
>
> #define EXYNOS5_DRD_PHYREG0 0x14
> +
> +#define EXYNOS5_DRD_PHYREG0_SSC_REF_CLK_SEL BIT(21)
> +#define EXYNOS5_DRD_PHYREG0_SSC_RANGE BIT(20)
> +#define EXYNOS5_DRD_PHYREG0_CR_WRITE BIT(19)
> +#define EXYNOS5_DRD_PHYREG0_CR_READ BIT(18)
> +#define EXYNOS5_DRD_PHYREG0_CR_DATA_IN(_x) ((_x) << 2)
> +#define EXYNOS5_DRD_PHYREG0_CR_CAP_DATA BIT(1)
> +#define EXYNOS5_DRD_PHYREG0_CR_CAP_ADDR BIT(0)
> +
> #define EXYNOS5_DRD_PHYREG1 0x18
>
> +#define EXYNOS5_DRD_PHYREG1_CR_DATA_OUT(_x) ((_x) << 1)
> +#define EXYNOS5_DRD_PHYREG1_CR_ACK BIT(0)
> +
> #define EXYNOS5_DRD_PHYPARAM0 0x1c
>
> #define PHYPARAM0_REF_USE_PAD BIT(31)
> @@ -118,6 +130,26 @@
> #define EXYNOS5_DRD_PHYRESUME 0x34
> #define EXYNOS5_DRD_LINKPORT 0x44
>
> +/* USB 3.0 DRD PHY SS Function Control Reg; accessed by CR_PORT */
> +#define EXYNOS5_DRD_PHYSS_LOSLEVEL_OVRD_IN (0x15)
> +
Please remove unnecessary line.
> +#define LOSLEVEL_OVRD_IN_LOS_BIAS_5420 (0x5 << 13)
> +#define LOSLEVEL_OVRD_IN_LOS_BIAS_DEFAULT (0x0 << 13)
> +#define LOSLEVEL_OVRD_IN_EN (0x1 << 10)
> +#define LOSLEVEL_OVRD_IN_LOS_LEVEL_DEFAULT (0x9 << 0)
> +
> +#define EXYNOS5_DRD_PHYSS_TX_VBOOSTLEVEL_OVRD_IN (0x12)
> +#define TX_VBOOSTLEVEL_OVRD_IN_VBOOST_5420 (0x5 << 13)
> +#define TX_VBOOSTLEVEL_OVRD_IN_VBOOST_DEFAULT (0x4 << 13)
> +
> +#define EXYNOS5_DRD_PHYSS_LANE0_TX_DEBUG (0x1010)
> +#define LANE0_TX_DEBUG_RXDET_MEAS_TIME_19M2_20M (0x4 << 4)
> +#define LANE0_TX_DEBUG_RXDET_MEAS_TIME_24M (0x8 << 4)
> +#define LANE0_TX_DEBUG_RXDET_MEAS_TIME_25M_26M (0x8 << 4)
> +#define LANE0_TX_DEBUG_RXDET_MEAS_TIME_48M_50M_52M (0x20 << 4)
> +#define LANE0_TX_DEBUG_RXDET_MEAS_TIME_62M5 (0x20 << 4)
> +#define LANE0_TX_DEBUG_RXDET_MEAS_TIME_96M_100M (0x40 << 4)
> +
> #define KHZ 1000
> #define MHZ (KHZ * KHZ)
>
> @@ -135,12 +167,14 @@ struct exynos5_usbdrd_phy_config {
> void (*phy_isol)(struct phy_usb_instance *inst, u32 on);
> void (*phy_init)(struct exynos5_usbdrd_phy *phy_drd);
> unsigned int (*set_refclk)(struct phy_usb_instance *inst);
> + int (*phy_calibrate)(struct phy_usb_instance *inst);
> };
>
> struct exynos5_usbdrd_phy_drvdata {
> const struct exynos5_usbdrd_phy_config *phy_cfg;
> u32 pmu_offset_usbdrd0_phy;
> u32 pmu_offset_usbdrd1_phy;
> + void (*calibrate)(struct exynos5_usbdrd_phy *phy_drd);
> };
>
> /**
> @@ -487,6 +521,138 @@ static int exynos5_usbdrd_phy_power_off(struct phy *phy)
> return 0;
> }
>
> +static void crport_handshake(struct exynos5_usbdrd_phy *phy_drd,
> + u32 val, u32 cmd)
> +{
> + u32 usec = 100;
> + u32 result;
> +
> + writel(val | cmd, phy_drd->reg_phy + EXYNOS5_DRD_PHYREG0);
> +
> + do {
> + result = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYREG1);
> + if (result & EXYNOS5_DRD_PHYREG1_CR_ACK)
> + break;
> +
> + udelay(1);
> + } while (usec-- > 0);
> +
> + if (!usec)
> + dev_err(phy_drd->dev,
> + "CRPORT handshake timeout1 (0x%08x)\n", val);
> +
> + usec = 100;
> +
> + writel(val, phy_drd->reg_phy + EXYNOS5_DRD_PHYREG0);
> +
> + do {
> + result = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYREG1);
> + if (!(result & EXYNOS5_DRD_PHYREG1_CR_ACK))
> + break;
> +
> + udelay(1);
> + } while (usec-- > 0);
> +
> + if (!usec)
> + dev_err(phy_drd->dev,
> + "CRPORT handshake timeout2 (0x%08x)\n", val);
> +}
> +
> +static void crport_ctrl_write(struct exynos5_usbdrd_phy *phy_drd,
> + u32 addr, u32 data)
> +{
> + /* Write Address */
> + crport_handshake(phy_drd, EXYNOS5_DRD_PHYREG0_CR_DATA_IN(addr),
> + EXYNOS5_DRD_PHYREG0_CR_CAP_ADDR);
According to the guidance from H/W team, before calling crport_handshake(),
write access for EXYNOS5_DRD_PHYREG0 register is necessary.
Please, add the write access as follows.
+ /* Write Address */
+ writel(EXYNOS5_DRD_PHYREG0_CR_DATA_IN(addr),
+ phy_drd->reg_phy + EXYNOS5_DRD_PHYREG0);
+ crport_handshake(phy_drd, EXYNOS5_DRD_PHYREG0_CR_DATA_IN(addr),
+ EXYNOS5_DRD_PHYREG0_CR_CAP_ADDR);
Best regards,
Jingoo Han
> +
> + /* Write Data */
> + crport_handshake(phy_drd, EXYNOS5_DRD_PHYREG0_CR_DATA_IN(data),
> + EXYNOS5_DRD_PHYREG0_CR_CAP_DATA);
> + crport_handshake(phy_drd, EXYNOS5_DRD_PHYREG0_CR_DATA_IN(data),
> + EXYNOS5_DRD_PHYREG0_CR_WRITE);
> +}
> +
> +/*
> + * Override PHY paramaeters using CR_PORT register to calibrate settings
> + * to meet meet SuperSpeed requirements, on Exynos5420 and Exynos5800 systems,
> + * which have 28nm USB 3.0 DRD PHY.
> + */
> +static void exynos5420_usbdrd_phy_calibrate(struct exynos5_usbdrd_phy *phy_drd)
> +{
> + u32 temp;
> +
> + /*
> + * Change los_bias to (0x5) for 28nm PHY from a
> + * default value (0x0); los_level is set as default
> + * (0x9) as also reflected in los_level[30:26] bits
> + * of PHYPARAM0 register.
> + */
> + temp = LOSLEVEL_OVRD_IN_LOS_BIAS_5420 |
> + LOSLEVEL_OVRD_IN_EN |
> + LOSLEVEL_OVRD_IN_LOS_LEVEL_DEFAULT;
> + crport_ctrl_write(phy_drd,
> + EXYNOS5_DRD_PHYSS_LOSLEVEL_OVRD_IN,
> + temp);
> +
> + /*
> + * Set tx_vboost_lvl to (0x5) for 28nm PHY Tuning,
> + * to raise Tx signal level from its default value of (0x4)
> + */
> + temp = TX_VBOOSTLEVEL_OVRD_IN_VBOOST_5420;
> + crport_ctrl_write(phy_drd,
> + EXYNOS5_DRD_PHYSS_TX_VBOOSTLEVEL_OVRD_IN,
> + temp);
> +
> + /*
> + * Set proper time to wait for RxDetect measurement, for
> + * desired reference clock of PHY, by tuning the CRPORT
> + * register LANE0.TX_DEBUG which is internal to PHY.
> + * This fixes issue with few USB 3.0 devices, which are
> + * not detected (not even generate interrupts on the bus
> + * on insertion) without this change.
> + * e.g. Samsung SUM-TSB16S 3.0 USB drive.
> + */
> + switch (phy_drd->extrefclk) {
> + case EXYNOS5_FSEL_50MHZ:
> + temp = LANE0_TX_DEBUG_RXDET_MEAS_TIME_48M_50M_52M;
> + break;
> + case EXYNOS5_FSEL_20MHZ:
> + case EXYNOS5_FSEL_19MHZ2:
> + temp = LANE0_TX_DEBUG_RXDET_MEAS_TIME_19M2_20M;
> + break;
> + case EXYNOS5_FSEL_24MHZ:
> + default:
> + temp = LANE0_TX_DEBUG_RXDET_MEAS_TIME_24M;
> + break;
> + }
> +
> + crport_ctrl_write(phy_drd,
> + EXYNOS5_DRD_PHYSS_LANE0_TX_DEBUG,
> + temp);
> +}
> +
> +/* Calibrate PIPE3 PHY settings, if any */
> +static int exynos5_usbdrd_pipe3_calibrate(struct phy_usb_instance *inst)
> +{
> + struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst);
> +
> + /* Call respective phy_calibrate given by certain platform */
> + if (phy_drd->drv_data->calibrate)
> + phy_drd->drv_data->calibrate(phy_drd);
> +
> + return 0;
> +}
> +
> +static int exynos5_usbdrd_phy_calibrate(struct phy *phy)
> +{
> + struct phy_usb_instance *inst = phy_get_drvdata(phy);
> +
> + if (inst->phy_cfg->phy_calibrate)
> + inst->phy_cfg->phy_calibrate(inst);
> +
> + return 0;
> +}
> +
> static struct phy *exynos5_usbdrd_phy_xlate(struct device *dev,
> struct of_phandle_args *args)
> {
> @@ -503,6 +669,7 @@ static struct phy_ops exynos5_usbdrd_phy_ops = {
> .exit = exynos5_usbdrd_phy_exit,
> .power_on = exynos5_usbdrd_phy_power_on,
> .power_off = exynos5_usbdrd_phy_power_off,
> + .calibrate = exynos5_usbdrd_phy_calibrate,
> .owner = THIS_MODULE,
> };
>
> @@ -518,6 +685,7 @@ static const struct exynos5_usbdrd_phy_config phy_cfg_exynos5[] = {
> .phy_isol = exynos5_usbdrd_phy_isol,
> .phy_init = exynos5_usbdrd_pipe3_init,
> .set_refclk = exynos5_usbdrd_pipe3_set_refclk,
> + .phy_calibrate = exynos5_usbdrd_pipe3_calibrate,
> },
> };
>
> @@ -525,6 +693,7 @@ static const struct exynos5_usbdrd_phy_drvdata exynos5420_usbdrd_phy = {
> .phy_cfg = phy_cfg_exynos5,
> .pmu_offset_usbdrd0_phy = EXYNOS5_USBDRD_PHY_CONTROL,
> .pmu_offset_usbdrd1_phy = EXYNOS5420_USBDRD1_PHY_CONTROL,
> + .calibrate = exynos5420_usbdrd_phy_calibrate,
Hmm, how about adding just flag for this, instead of function callback?
It looks a little bit confusing.
Best regards,
Jingoo Han
> };
>
> static const struct exynos5_usbdrd_phy_drvdata exynos5250_usbdrd_phy = {
> --
> 1.7.10.4
>
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