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Commit d05664f3 authored by Nitin Rawat's avatar Nitin Rawat
Browse files

scsi: ufs: update UFS initialization sequence 



During UFS host init, we calibrate the UFS host PHY with
HS-Gear4 Rate-B settings by default. After UFS device is
initialized but before it switched to HS mode, if it
found as UFS 2.x device we re-init the UFS host PHY
with its HS-Gear3 Rate-B settings, then start over
the UFS device initialization again.

Change-Id: I854a34b2e5d76103d447508cf2137427def93d17
Signed-off-by: default avatarCan Guo <cang@codeaurora.org>
Signed-off-by: default avatarNitin Rawat <nitirawa@codeaurora.org>
Signed-off-by: default avatarRam Prakash Gupta <rampraka@codeaurora.org>
parent c9d2eaf4

drivers/scsi/ufs/ufs-qcom.c

+7 −0
Original line number Diff line number Diff line
@@ -534,6 +534,10 @@ static int ufs_qcom_power_up_sequence(struct ufs_hba *hba) 


	if (host->hw_ver.major < 0x4)

		submode = UFS_QCOM_PHY_SUBMODE_NON_G4;

#if defined(CONFIG_SCSI_UFSHCD_QTI)

	if (hba->limit_phy_submode == 0)

		submode = UFS_QCOM_PHY_SUBMODE_NON_G4;

#endif

	phy_set_mode_ext(phy, mode, submode);



	ret = ufs_qcom_phy_power_on(hba);
@@ -3373,6 +3377,9 @@ static void ufs_qcom_parse_limits(struct ufs_qcom_host *host) 
	of_property_read_u32(np, "limit-rx-pwm-gear", &host->limit_rx_pwm_gear);

	of_property_read_u32(np, "limit-rate", &host->limit_rate);

	of_property_read_u32(np, "limit-phy-submode", &host->limit_phy_submode);

#if defined(CONFIG_SCSI_UFSHCD_QTI)

	host->hba->limit_phy_submode = host->limit_phy_submode;

#endif

}



/*

drivers/scsi/ufs/ufshcd.c

+34 −0
Original line number Diff line number Diff line
@@ -7790,9 +7790,15 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, bool async) 
{

	int ret;

	unsigned long flags;

#if defined(CONFIG_SCSI_UFSHCD_QTI)

	bool reinit_needed = true;

#endif

	ktime_t start = ktime_get();



	dev_err(hba->dev, "*** This is %s ***\n", __FILE__);

#if defined(CONFIG_SCSI_UFSHCD_QTI)

reinit:

#endif

	ret = ufshcd_link_startup(hba);

	if (ret)

		goto out;
@@ -7827,6 +7833,34 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, bool async) 
			goto out;

	}



#if defined(CONFIG_SCSI_UFSHCD_QTI)

	/*

	 * After reading the device descriptor, it is found as UFS 2.x

	 * device and limit_phy_submode is set as 1 in DT file i.e

	 * host phy is calibrated with gear4 setting, we need to

	 * reinitialize UFS phy host with HS-Gear3, Rate B.

	 */

	if (hba->dev_info.wspecversion < 0x300 &&

		hba->limit_phy_submode && reinit_needed) {

		unsigned long flags;

		int err;



		ufshcd_vops_device_reset(hba);



		/* Reset the host controller */

		spin_lock_irqsave(hba->host->host_lock, flags);

		ufshcd_hba_stop(hba, false);

		spin_unlock_irqrestore(hba->host->host_lock, flags);



		hba->limit_phy_submode = 0;

		err = ufshcd_hba_enable(hba);

		if (err)

			goto out;

		reinit_needed = false;



		goto reinit;

	}

#endif

	ufshcd_tune_unipro_params(hba);



	/* UFS device is also active now */

drivers/scsi/ufs/ufshcd.h

+1 −1
Original line number Diff line number Diff line
@@ -389,7 +389,6 @@ struct ufs_hba_variant_ops { 
	void	(*config_scaling_param)(struct ufs_hba *hba,

					struct devfreq_dev_profile *profile,

					void *data);



	ANDROID_KABI_RESERVE(1);

	ANDROID_KABI_RESERVE(2);

	ANDROID_KABI_RESERVE(3);
@@ -996,6 +995,7 @@ struct ufs_hba { 
	u32 limit_rx_hs_gear;

	u32 limit_tx_pwm_gear;

	u32 limit_rx_pwm_gear;

	u32 limit_phy_submode;

	bool restore_needed;

	u32 scsi_cmd_timeout;

	bool auto_h8_err;