scsi: ufs-qcom: Remove unused MSM bus scaling APIs

MSM bus scaling has moved on to use interconnect framework and downstream
bus scaling APIs like msm_bus_scale*() do not exist anymore in the
kernel. Currently they are guarded by a config which also does not exist
and hence there are no build failures reported. Remove these unused
interfaces as they are currently no-ops and the scaling support that may be
added in future will use interconnect API.

Link: https://lore.kernel.org/r/20200804161033.15586-1-saiprakash.ranjan@codeaurora.orgSigned-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ufs/ufs-qcom.c

@@ -621,218 +621,6 @@ static int ufs_qcom_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 	return 0;
 }
 
-#ifdef CONFIG_MSM_BUS_SCALING
-static int ufs_qcom_get_bus_vote(struct ufs_qcom_host *host,
-		const char *speed_mode)
-{
-	struct device *dev = host->hba->dev;
-	struct device_node *np = dev->of_node;
-	int err;
-	const char *key = "qcom,bus-vector-names";
-
-	if (!speed_mode) {
-		err = -EINVAL;
-		goto out;
-	}
-
-	if (host->bus_vote.is_max_bw_needed && !!strcmp(speed_mode, "MIN"))
-		err = of_property_match_string(np, key, "MAX");
-	else
-		err = of_property_match_string(np, key, speed_mode);
-
-out:
-	if (err < 0)
-		dev_err(dev, "%s: Invalid %s mode %d\n",
-				__func__, speed_mode, err);
-	return err;
-}
-
-static void ufs_qcom_get_speed_mode(struct ufs_pa_layer_attr *p, char *result)
-{
-	int gear = max_t(u32, p->gear_rx, p->gear_tx);
-	int lanes = max_t(u32, p->lane_rx, p->lane_tx);
-	int pwr;
-
-	/* default to PWM Gear 1, Lane 1 if power mode is not initialized */
-	if (!gear)
-		gear = 1;
-
-	if (!lanes)
-		lanes = 1;
-
-	if (!p->pwr_rx && !p->pwr_tx) {
-		pwr = SLOWAUTO_MODE;
-		snprintf(result, BUS_VECTOR_NAME_LEN, "MIN");
-	} else if (p->pwr_rx == FAST_MODE || p->pwr_rx == FASTAUTO_MODE ||
-		 p->pwr_tx == FAST_MODE || p->pwr_tx == FASTAUTO_MODE) {
-		pwr = FAST_MODE;
-		snprintf(result, BUS_VECTOR_NAME_LEN, "%s_R%s_G%d_L%d", "HS",
-			 p->hs_rate == PA_HS_MODE_B ? "B" : "A", gear, lanes);
-	} else {
-		pwr = SLOW_MODE;
-		snprintf(result, BUS_VECTOR_NAME_LEN, "%s_G%d_L%d",
-			 "PWM", gear, lanes);
-	}
-}
-
-static int __ufs_qcom_set_bus_vote(struct ufs_qcom_host *host, int vote)
-{
-	int err = 0;
-
-	if (vote != host->bus_vote.curr_vote) {
-		err = msm_bus_scale_client_update_request(
-				host->bus_vote.client_handle, vote);
-		if (err) {
-			dev_err(host->hba->dev,
-				"%s: msm_bus_scale_client_update_request() failed: bus_client_handle=0x%x, vote=%d, err=%d\n",
-				__func__, host->bus_vote.client_handle,
-				vote, err);
-			goto out;
-		}
-
-		host->bus_vote.curr_vote = vote;
-	}
-out:
-	return err;
-}
-
-static int ufs_qcom_update_bus_bw_vote(struct ufs_qcom_host *host)
-{
-	int vote;
-	int err = 0;
-	char mode[BUS_VECTOR_NAME_LEN];
-
-	ufs_qcom_get_speed_mode(&host->dev_req_params, mode);
-
-	vote = ufs_qcom_get_bus_vote(host, mode);
-	if (vote >= 0)
-		err = __ufs_qcom_set_bus_vote(host, vote);
-	else
-		err = vote;
-
-	if (err)
-		dev_err(host->hba->dev, "%s: failed %d\n", __func__, err);
-	else
-		host->bus_vote.saved_vote = vote;
-	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)
-{
-	struct ufs_hba *hba = dev_get_drvdata(dev);
-	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
-
-	return snprintf(buf, PAGE_SIZE, "%u\n",
-			host->bus_vote.is_max_bw_needed);
-}
-
-static ssize_t
-store_ufs_to_mem_max_bus_bw(struct device *dev, struct device_attribute *attr,
-		const char *buf, size_t count)
-{
-	struct ufs_hba *hba = dev_get_drvdata(dev);
-	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
-	uint32_t value;
-
-	if (!kstrtou32(buf, 0, &value)) {
-		host->bus_vote.is_max_bw_needed = !!value;
-		ufs_qcom_update_bus_bw_vote(host);
-	}
-
-	return count;
-}
-
-static int ufs_qcom_bus_register(struct ufs_qcom_host *host)
-{
-	int err;
-	struct msm_bus_scale_pdata *bus_pdata;
-	struct device *dev = host->hba->dev;
-	struct platform_device *pdev = to_platform_device(dev);
-	struct device_node *np = dev->of_node;
-
-	bus_pdata = msm_bus_cl_get_pdata(pdev);
-	if (!bus_pdata) {
-		dev_err(dev, "%s: failed to get bus vectors\n", __func__);
-		err = -ENODATA;
-		goto out;
-	}
-
-	err = of_property_count_strings(np, "qcom,bus-vector-names");
-	if (err < 0 || err != bus_pdata->num_usecases) {
-		dev_err(dev, "%s: qcom,bus-vector-names not specified correctly %d\n",
-				__func__, err);
-		goto out;
-	}
-
-	host->bus_vote.client_handle = msm_bus_scale_register_client(bus_pdata);
-	if (!host->bus_vote.client_handle) {
-		dev_err(dev, "%s: msm_bus_scale_register_client failed\n",
-				__func__);
-		err = -EFAULT;
-		goto out;
-	}
-
-	/* cache the vote index for minimum and maximum bandwidth */
-	host->bus_vote.min_bw_vote = ufs_qcom_get_bus_vote(host, "MIN");
-	host->bus_vote.max_bw_vote = ufs_qcom_get_bus_vote(host, "MAX");
-
-	host->bus_vote.max_bus_bw.show = show_ufs_to_mem_max_bus_bw;
-	host->bus_vote.max_bus_bw.store = store_ufs_to_mem_max_bus_bw;
-	sysfs_attr_init(&host->bus_vote.max_bus_bw.attr);
-	host->bus_vote.max_bus_bw.attr.name = "max_bus_bw";
-	host->bus_vote.max_bus_bw.attr.mode = S_IRUGO | S_IWUSR;
-	err = device_create_file(dev, &host->bus_vote.max_bus_bw);
-out:
-	return err;
-}
-#else /* CONFIG_MSM_BUS_SCALING */
-static int ufs_qcom_update_bus_bw_vote(struct ufs_qcom_host *host)
-{
-	return 0;
-}
-
-static int ufs_qcom_set_bus_vote(struct ufs_hba *host, bool on)
-{
-	return 0;
-}
-
-static int ufs_qcom_bus_register(struct ufs_qcom_host *host)
-{
-	return 0;
-}
-#endif /* CONFIG_MSM_BUS_SCALING */
-
 static void ufs_qcom_dev_ref_clk_ctrl(struct ufs_qcom_host *host, bool enable)
 {
 	if (host->dev_ref_clk_ctrl_mmio &&
@@ -976,7 +764,6 @@ static int ufs_qcom_pwr_change_notify(struct ufs_hba *hba,
 		/* cache the power mode parameters to use internally */
 		memcpy(&host->dev_req_params,
 				dev_req_params, sizeof(*dev_req_params));
-		ufs_qcom_update_bus_bw_vote(host);
 
 		/* disable the device ref clock if entered PWM mode */
 		if (ufshcd_is_hs_mode(&hba->pwr_info) &&
@@ -1107,9 +894,7 @@ static int ufs_qcom_setup_clocks(struct ufs_hba *hba, bool on,
 
 	switch (status) {
 	case PRE_CHANGE:
-		if (on) {
-			err = ufs_qcom_set_bus_vote(hba, true);
-		} else {
+		if (!on) {
 			if (!ufs_qcom_is_link_active(hba)) {
 				/* disable device ref_clk */
 				ufs_qcom_dev_ref_clk_ctrl(host, false);
@@ -1121,8 +906,6 @@ static int ufs_qcom_setup_clocks(struct ufs_hba *hba, bool 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;
 	}
@@ -1264,10 +1047,6 @@ static int ufs_qcom_init(struct ufs_hba *hba)
 		goto out_variant_clear;
 	}
 
-	err = ufs_qcom_bus_register(host);
-	if (err)
-		goto out_variant_clear;
-
 	ufs_qcom_get_controller_revision(hba, &host->hw_ver.major,
 		&host->hw_ver.minor, &host->hw_ver.step);
 
@@ -1307,7 +1086,6 @@ static int ufs_qcom_init(struct ufs_hba *hba)
 	if (err)
 		goto out_variant_clear;
 
-	ufs_qcom_set_bus_vote(hba, true);
 	ufs_qcom_setup_clocks(hba, true, POST_CHANGE);
 
 	if (hba->dev->id < MAX_UFS_QCOM_HOSTS)
@@ -1446,7 +1224,6 @@ static int ufs_qcom_clk_scale_notify(struct ufs_hba *hba,
 				    dev_req_params->pwr_rx,
 				    dev_req_params->hs_rate,
 				    false);
-		ufs_qcom_update_bus_bw_vote(host);
 	}
 
 out:

drivers/scsi/ufs/ufs-qcom.h

@@ -174,16 +174,6 @@ static inline void ufs_qcom_deassert_reset(struct ufs_hba *hba)
 	mb();
 }
 
-struct ufs_qcom_bus_vote {
-	uint32_t client_handle;
-	uint32_t curr_vote;
-	int min_bw_vote;
-	int max_bw_vote;
-	int saved_vote;
-	bool is_max_bw_needed;
-	struct device_attribute max_bus_bw;
-};
-
 /* Host controller hardware version: major.minor.step */
 struct ufs_hw_version {
 	u16 step;
@@ -216,7 +206,6 @@ struct ufs_qcom_host {
 
 	struct phy *generic_phy;
 	struct ufs_hba *hba;
-	struct ufs_qcom_bus_vote bus_vote;
 	struct ufs_pa_layer_attr dev_req_params;
 	struct clk *rx_l0_sync_clk;
 	struct clk *tx_l0_sync_clk;