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Message-Id: <1607520942-22254-3-git-send-email-cang@codeaurora.org>
Date: Wed, 9 Dec 2020 05:35:41 -0800
From: Can Guo <cang@...eaurora.org>
To: asutoshd@...eaurora.org, nguyenb@...eaurora.org,
hongwus@...eaurora.org, rnayak@...eaurora.org,
linux-scsi@...r.kernel.org, kernel-team@...roid.com,
saravanak@...gle.com, salyzyn@...gle.com, cang@...eaurora.org
Cc: Alim Akhtar <alim.akhtar@...sung.com>,
Avri Altman <avri.altman@....com>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Stanley Chu <stanley.chu@...iatek.com>,
Bean Huo <beanhuo@...ron.com>,
Bart Van Assche <bvanassche@....org>,
Satya Tangirala <satyat@...gle.com>,
linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 2/2] scsi: ufs: Clean up ufshcd_exit_clk_scaling/gating()
ufshcd_hba_exit() is always called after ufshcd_exit_clk_scaling() and
ufshcd_exit_clk_gating(), so move ufshcd_exit_clk_scaling/gating() to
ufshcd_hba_exit().
Signed-off-by: Can Guo <cang@...eaurora.org>
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 12266bd..41a12d6 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -1846,11 +1846,14 @@ static void ufshcd_init_clk_scaling(struct ufs_hba *hba)
snprintf(wq_name, sizeof(wq_name), "ufs_clkscaling_%d",
hba->host->host_no);
hba->clk_scaling.workq = create_singlethread_workqueue(wq_name);
+
+ hba->clk_scaling.is_initialized = true;
}
static void ufshcd_exit_clk_scaling(struct ufs_hba *hba)
{
- if (!ufshcd_is_clkscaling_supported(hba))
+ if (!ufshcd_is_clkscaling_supported(hba) ||
+ !hba->clk_scaling.is_initialized)
return;
if (hba->devfreq)
@@ -1894,12 +1897,16 @@ static void ufshcd_init_clk_gating(struct ufs_hba *hba)
hba->clk_gating.enable_attr.attr.mode = 0644;
if (device_create_file(hba->dev, &hba->clk_gating.enable_attr))
dev_err(hba->dev, "Failed to create sysfs for clkgate_enable\n");
+
+ hba->clk_gating.is_initialized = true;
}
static void ufshcd_exit_clk_gating(struct ufs_hba *hba)
{
- if (!ufshcd_is_clkgating_allowed(hba))
+ if (!ufshcd_is_clkgating_allowed(hba) ||
+ !hba->clk_gating.is_initialized)
return;
+
device_remove_file(hba->dev, &hba->clk_gating.delay_attr);
device_remove_file(hba->dev, &hba->clk_gating.enable_attr);
cancel_work_sync(&hba->clk_gating.ungate_work);
@@ -7764,7 +7771,6 @@ static void ufshcd_async_scan(void *data, async_cookie_t cookie)
*/
if (ret) {
pm_runtime_put_sync(hba->dev);
- ufshcd_exit_clk_scaling(hba);
ufshcd_hba_exit(hba);
}
}
@@ -8201,12 +8207,12 @@ static int ufshcd_hba_init(struct ufs_hba *hba)
static void ufshcd_hba_exit(struct ufs_hba *hba)
{
if (hba->is_powered) {
+ ufshcd_exit_clk_scaling(hba);
+ ufshcd_exit_clk_gating(hba);
+ if (hba->eh_wq)
+ destroy_workqueue(hba->eh_wq);
ufshcd_variant_hba_exit(hba);
ufshcd_setup_vreg(hba, false);
- ufshcd_suspend_clkscaling(hba);
- if (ufshcd_is_clkscaling_supported(hba))
- if (hba->devfreq)
- ufshcd_suspend_clkscaling(hba);
ufshcd_setup_clocks(hba, false);
ufshcd_setup_hba_vreg(hba, false);
hba->is_powered = false;
@@ -8955,13 +8961,9 @@ void ufshcd_remove(struct ufs_hba *hba)
blk_mq_free_tag_set(&hba->tmf_tag_set);
blk_cleanup_queue(hba->cmd_queue);
scsi_remove_host(hba->host);
- destroy_workqueue(hba->eh_wq);
/* disable interrupts */
ufshcd_disable_intr(hba, hba->intr_mask);
ufshcd_hba_stop(hba);
-
- ufshcd_exit_clk_scaling(hba);
- ufshcd_exit_clk_gating(hba);
ufshcd_hba_exit(hba);
}
EXPORT_SYMBOL_GPL(ufshcd_remove);
@@ -9160,7 +9162,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
err = devm_request_irq(dev, irq, ufshcd_intr, IRQF_SHARED, UFSHCD, hba);
if (err) {
dev_err(hba->dev, "request irq failed\n");
- goto exit_gating;
+ goto out_disable;
} else {
hba->is_irq_enabled = true;
}
@@ -9168,7 +9170,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
err = scsi_add_host(host, hba->dev);
if (err) {
dev_err(hba->dev, "scsi_add_host failed\n");
- goto exit_gating;
+ goto out_disable;
}
hba->cmd_queue = blk_mq_init_queue(&hba->host->tag_set);
@@ -9251,10 +9253,6 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
blk_cleanup_queue(hba->cmd_queue);
out_remove_scsi_host:
scsi_remove_host(hba->host);
-exit_gating:
- ufshcd_exit_clk_scaling(hba);
- ufshcd_exit_clk_gating(hba);
- destroy_workqueue(hba->eh_wq);
out_disable:
hba->is_irq_enabled = false;
ufshcd_hba_exit(hba);
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 9fcecba..3c57847 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -347,6 +347,7 @@ enum clk_gating_state {
* @delay_attr: sysfs attribute to control delay_attr
* @enable_attr: sysfs attribute to enable/disable clock gating
* @is_enabled: Indicates the current status of clock gating
+ * @is_initialized: Indicates whether clock gating is initialized or not
* @active_reqs: number of requests that are pending and should be waited for
* completion before gating clocks.
*/
@@ -359,6 +360,7 @@ struct ufs_clk_gating {
struct device_attribute delay_attr;
struct device_attribute enable_attr;
bool is_enabled;
+ bool is_initialized;
int active_reqs;
struct workqueue_struct *clk_gating_workq;
};
@@ -384,6 +386,7 @@ struct ufs_saved_pwr_info {
* @resume_work: worker to resume devfreq
* @is_enabled: tracks if scaling is currently enabled or not
* @is_allowed: tracks if scaling is currently allowed or not
+ * @is_initialized: Indicates whether clock scaling is initialized or not
* @is_busy_started: tracks if busy period has started or not
* @is_suspended: tracks if devfreq is suspended or not
*/
@@ -399,6 +402,7 @@ struct ufs_clk_scaling {
struct work_struct resume_work;
bool is_enabled;
bool is_allowed;
+ bool is_initialized;
bool is_busy_started;
bool is_suspended;
};
--
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