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Commit b0b8f2db authored by Asutosh Das's avatar Asutosh Das
Browse files

ufs: ufs-qcom: Add support for presilicon configuration 



The UFS phy during pre-silicon runs in HS-G1 and doesn't
support low-power modes.
It provides a method to disable-lpm and restrict
the gear to the desired value.

Change-Id: Iad7fae4aa4ed04546a761209d74107ad62d92ac7
Signed-off-by: default avatarAsutosh Das <asutoshd@codeaurora.org>
parent cd1b0b74

drivers/scsi/ufs/ufs-qcom.c

+55 −7
Original line number Diff line number Diff line
@@ -40,6 +40,8 @@ static int ufs_qcom_set_bus_vote(struct ufs_qcom_host *host, int vote); 
static void ufs_qcom_get_default_testbus_cfg(struct ufs_qcom_host *host);

static int ufs_qcom_set_dme_vs_core_clk_ctrl_clear_div(struct ufs_hba *hba,

						       u32 clk_cycles);

static void ufs_qcom_parse_gear_limits(struct ufs_qcom_host *host);

static void ufs_qcom_parse_lpm(struct ufs_qcom_host *host);



static struct ufs_qcom_host *rcdev_to_ufs_host(struct reset_controller_dev *rcd)

{
@@ -809,12 +811,14 @@ static int ufs_qcom_pwr_change_notify(struct ufs_hba *hba, 


	switch (status) {

	case PRE_CHANGE:

		ufs_qcom_cap.hs_rx_gear = host->limit_rx_hs_gear;

		ufs_qcom_cap.hs_tx_gear = host->limit_tx_hs_gear;

		ufs_qcom_cap.pwm_tx_gear = host->limit_tx_pwm_gear;

		ufs_qcom_cap.pwm_rx_gear = host->limit_rx_pwm_gear;



		ufs_qcom_cap.tx_lanes = UFS_QCOM_LIMIT_NUM_LANES_TX;

		ufs_qcom_cap.rx_lanes = UFS_QCOM_LIMIT_NUM_LANES_RX;

		ufs_qcom_cap.hs_rx_gear = UFS_QCOM_LIMIT_HSGEAR_RX;

		ufs_qcom_cap.hs_tx_gear = UFS_QCOM_LIMIT_HSGEAR_TX;

		ufs_qcom_cap.pwm_rx_gear = UFS_QCOM_LIMIT_PWMGEAR_RX;

		ufs_qcom_cap.pwm_tx_gear = UFS_QCOM_LIMIT_PWMGEAR_TX;



		ufs_qcom_cap.rx_pwr_pwm = UFS_QCOM_LIMIT_RX_PWR_PWM;

		ufs_qcom_cap.tx_pwr_pwm = UFS_QCOM_LIMIT_TX_PWR_PWM;

		ufs_qcom_cap.rx_pwr_hs = UFS_QCOM_LIMIT_RX_PWR_HS;
@@ -956,15 +960,20 @@ static void ufs_qcom_advertise_quirks(struct ufs_hba *hba) 
				| UFSHCD_QUIRK_DME_PEER_ACCESS_AUTO_MODE

				| UFSHCD_QUIRK_BROKEN_PA_RXHSUNTERMCAP);

	}



	if (host->disable_lpm)

		hba->quirks |= UFSHCD_QUIRK_BROKEN_AUTO_HIBERN8;

}



static void ufs_qcom_set_caps(struct ufs_hba *hba)

{

	struct ufs_qcom_host *host = ufshcd_get_variant(hba);



	hba->caps |= UFSHCD_CAP_CLK_GATING | UFSHCD_CAP_HIBERN8_WITH_CLK_GATING;

	hba->caps |= UFSHCD_CAP_CLK_SCALING;

	hba->caps |= UFSHCD_CAP_AUTO_BKOPS_SUSPEND;

	if (!host->disable_lpm) {

		hba->caps |= UFSHCD_CAP_CLK_GATING |

			UFSHCD_CAP_HIBERN8_WITH_CLK_GATING |

			UFSHCD_CAP_CLK_SCALING | UFSHCD_CAP_AUTO_BKOPS_SUSPEND;

	}



	if (host->hw_ver.major >= 0x2) {

		host->caps = UFS_QCOM_CAP_QUNIPRO |
@@ -1167,6 +1176,11 @@ static int ufs_qcom_init(struct ufs_hba *hba) 
	if (err)

		goto out_variant_clear;



	ufs_qcom_parse_gear_limits(host);

	ufs_qcom_parse_lpm(host);

	if (host->disable_lpm)

		pm_runtime_forbid(host->hba->dev);



	ufs_qcom_set_caps(hba);

	ufs_qcom_advertise_quirks(hba);
@@ -1537,6 +1551,40 @@ static void ufs_qcom_dump_dbg_regs(struct ufs_hba *hba) 
	usleep_range(1000, 1100);

}



/*

 * ufs_qcom_parse_gear_limits - read from DTS if gears should be limited

 */

static void ufs_qcom_parse_gear_limits(struct ufs_qcom_host *host)

{

	struct device_node *np = host->hba->dev->of_node;



	if (!np)

		return;



	host->limit_tx_hs_gear = UFS_QCOM_LIMIT_HSGEAR_TX;

	host->limit_rx_hs_gear = UFS_QCOM_LIMIT_HSGEAR_RX;

	host->limit_tx_pwm_gear = UFS_QCOM_LIMIT_PWMGEAR_TX;

	host->limit_rx_pwm_gear = UFS_QCOM_LIMIT_PWMGEAR_RX;



	of_property_read_u32(np, "limit-tx-hs-gear", &host->limit_tx_hs_gear);

	of_property_read_u32(np, "limit-rx-hs-gear", &host->limit_rx_hs_gear);

	of_property_read_u32(np, "limit-tx-pwm-gear", &host->limit_tx_pwm_gear);

	of_property_read_u32(np, "limit-rx-pwm-gear", &host->limit_rx_pwm_gear);

}



/*

 * ufs_qcom_parse_lpm - read from DTS whether LPM modes should be disabled.

 */

static void ufs_qcom_parse_lpm(struct ufs_qcom_host *host)

{

	struct device_node *node = host->hba->dev->of_node;



	host->disable_lpm = of_property_read_bool(node, "qcom,disable-lpm");

	if (host->disable_lpm)

		dev_info(host->hba->dev, "(%s) All LPM is disabled\n",

			 __func__);

}



/**

 * struct ufs_hba_qcom_vops - UFS QCOM specific variant operations

 *

drivers/scsi/ufs/ufs-qcom.h

+6 −1
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0-only */

/* Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.

/* Copyright (c) 2013-2019, The Linux Foundation. All rights reserved.

 */



#ifndef UFS_QCOM_H_
@@ -232,6 +232,11 @@ struct ufs_qcom_host { 
	struct ufs_qcom_testbus testbus;



	struct reset_controller_dev rcdev;

	int limit_tx_hs_gear;

	int limit_rx_hs_gear;

	int limit_tx_pwm_gear;

	int limit_rx_pwm_gear;

	bool disable_lpm;

};



static inline u32