Commit 8240dd97 authored by Can Guo's avatar Can Guo Committed by Martin K. Petersen
Browse files

scsi: ufs-qcom: Adjust bus bandwidth voting and unvoting 

The bus bandwidth voting is required to be done before the bus clocks are
enabled, and the unvoting is required to be done only after the bus clocks
are disabled.

Link: https://lore.kernel.org/r/1581392451-28743-4-git-send-email-cang@codeaurora.org


Reviewed-by: default avatarAsutosh Das <asutoshd@codeaurora.org>
Reviewed-by: default avatarHongwu Su <hongwus@codeaurora.org>
Signed-off-by: default avatarCan Guo <cang@codeaurora.org>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 90d88f47

drivers/scsi/ufs/ufs-qcom.c

+53 −25
Original line number Diff line number Diff line
@@ -38,7 +38,6 @@ enum { 


static struct ufs_qcom_host *ufs_qcom_hosts[MAX_UFS_QCOM_HOSTS];



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);
@@ -672,7 +671,7 @@ static void ufs_qcom_get_speed_mode(struct ufs_pa_layer_attr *p, char *result) 
	}

}



static int ufs_qcom_set_bus_vote(struct ufs_qcom_host *host, int vote)

static int __ufs_qcom_set_bus_vote(struct ufs_qcom_host *host, int vote)

{

	int err = 0;
@@ -703,7 +702,7 @@ static int ufs_qcom_update_bus_bw_vote(struct ufs_qcom_host *host) 


	vote = ufs_qcom_get_bus_vote(host, mode);

	if (vote >= 0)

		err = ufs_qcom_set_bus_vote(host, vote);

		err = __ufs_qcom_set_bus_vote(host, vote);

	else

		err = vote;
@@ -714,6 +713,35 @@ static int ufs_qcom_update_bus_bw_vote(struct ufs_qcom_host *host) 
	return err;

}



static int ufs_qcom_set_bus_vote(struct ufs_hba *hba, bool on)

{

	struct ufs_qcom_host *host = ufshcd_get_variant(hba);

	int vote, err;



	/*

	 * In case ufs_qcom_init() is not yet done, simply ignore.

	 * This ufs_qcom_set_bus_vote() shall be called from

	 * ufs_qcom_init() after init is done.

	 */

	if (!host)

		return 0;



	if (on) {

		vote = host->bus_vote.saved_vote;

		if (vote == host->bus_vote.min_bw_vote)

			ufs_qcom_update_bus_bw_vote(host);

	} else {

		vote = host->bus_vote.min_bw_vote;

	}



	err = __ufs_qcom_set_bus_vote(host, vote);

	if (err)

		dev_err(hba->dev, "%s: set bus vote failed %d\n",

				 __func__, err);



	return err;

}



static ssize_t

show_ufs_to_mem_max_bus_bw(struct device *dev, struct device_attribute *attr,

			char *buf)
@@ -790,7 +818,7 @@ static int ufs_qcom_update_bus_bw_vote(struct ufs_qcom_host *host) 
	return 0;

}



static int ufs_qcom_set_bus_vote(struct ufs_qcom_host *host, int vote)

static int ufs_qcom_set_bus_vote(struct ufs_hba *host, bool on)

{

	return 0;

}
@@ -1042,8 +1070,7 @@ static int ufs_qcom_setup_clocks(struct ufs_hba *hba, bool on, 
				 enum ufs_notify_change_status status)

{

	struct ufs_qcom_host *host = ufshcd_get_variant(hba);

	int err;

	int vote = 0;

	int err = 0;



	/*

	 * In case ufs_qcom_init() is not yet done, simply ignore.
@@ -1053,27 +1080,27 @@ static int ufs_qcom_setup_clocks(struct ufs_hba *hba, bool on, 
	if (!host)

		return 0;



	if (on && (status == POST_CHANGE)) {

		/* enable the device ref clock for HS mode*/

		if (ufshcd_is_hs_mode(&hba->pwr_info))

			ufs_qcom_dev_ref_clk_ctrl(host, true);

		vote = host->bus_vote.saved_vote;

		if (vote == host->bus_vote.min_bw_vote)

			ufs_qcom_update_bus_bw_vote(host);



	} else if (!on && (status == PRE_CHANGE)) {

	switch (status) {

	case PRE_CHANGE:

		if (on) {

			err = ufs_qcom_set_bus_vote(hba, true);

		} else {

			if (!ufs_qcom_is_link_active(hba)) {

				/* disable device ref_clk */

				ufs_qcom_dev_ref_clk_ctrl(host, false);

			}



		vote = host->bus_vote.min_bw_vote;

		}



	err = ufs_qcom_set_bus_vote(host, vote);

	if (err)

		dev_err(hba->dev, "%s: set bus vote failed %d\n",

				__func__, err);

		break;

	case POST_CHANGE:

		if (on) {

			/* enable the device ref clock for HS mode*/

			if (ufshcd_is_hs_mode(&hba->pwr_info))

				ufs_qcom_dev_ref_clk_ctrl(host, true);

		} else {

			err = ufs_qcom_set_bus_vote(hba, false);

		}

		break;

	}



	return err;

}
@@ -1250,6 +1277,7 @@ static int ufs_qcom_init(struct ufs_hba *hba) 
	ufs_qcom_set_caps(hba);

	ufs_qcom_advertise_quirks(hba);



	ufs_qcom_set_bus_vote(hba, true);

	ufs_qcom_setup_clocks(hba, true, POST_CHANGE);



	if (hba->dev->id < MAX_UFS_QCOM_HOSTS)

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