Hi
Here is V3, now re-based on top of patch "scsi: ufs: sysfs:reworking of the
rpm_lvl and spm_lvl entries".
Michał Potomski has previously sent a patch for Auto-Hibernate, but this
patch is slightly different, based on the latest ufs-sysfs changes, it also
takes care to restore auto-hibernate during resume, and otherwise avoids
updating the register if the device is runtime suspended. Also a default
value of 150ms is set.
Changes in V3:
Return -EOPNOTSUPP from auto_hibern8_show() if Auto-Hibernate
is not supported.
Changes in V2:
Re-based on top of (yet to be applied) patch "scsi: ufs: sysfs:
reworking of the rpm_lvl and spm_lvl entries"
Adrian Hunter (1):
scsi: ufs: Add support for Auto-Hibernate Idle Timer
Documentation/ABI/testing/sysfs-driver-ufs | 15 ++++++
drivers/scsi/ufs/ufs-sysfs.c | 77 ++++++++++++++++++++++++++++++
drivers/scsi/ufs/ufshcd.c | 26 ++++++++++
drivers/scsi/ufs/ufshcd.h | 3 ++
drivers/scsi/ufs/ufshci.h | 7 +++
5 files changed, 128 insertions(+)
Regards
Adrian
UFS host controllers may support an autonomous power management feature
called the Auto-Hibernate Idle Timer. The timer is set to the number of
microseconds of idle time before the UFS host controller will autonomously
put the link into Hibernate state. That will save power at the expense of
increased latency. Any access to the host controller interface registers
will automatically put the link out of Hibernate state. So once configured,
the feature is transparent to the driver.
Expose the Auto-Hibernate Idle Timer value via SysFS to allow users to
choose between power efficiency or lower latency. Set a default value of
150 ms.
Signed-off-by: Adrian Hunter <[email protected]>
---
Documentation/ABI/testing/sysfs-driver-ufs | 14 ++++++
drivers/scsi/ufs/ufs-sysfs.c | 76 ++++++++++++++++++++++++++++++
drivers/scsi/ufs/ufshcd.c | 26 ++++++++++
drivers/scsi/ufs/ufshcd.h | 3 ++
drivers/scsi/ufs/ufshci.h | 7 +++
5 files changed, 126 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-driver-ufs b/Documentation/ABI/testing/sysfs-driver-ufs
index 83735f79e572..016724ec26d5 100644
--- a/Documentation/ABI/testing/sysfs-driver-ufs
+++ b/Documentation/ABI/testing/sysfs-driver-ufs
@@ -1,3 +1,17 @@
+What: /sys/bus/*/drivers/ufshcd/*/auto_hibern8
+Date: March 2018
+Contact: [email protected]
+Description:
+ This file contains the auto-hibernate idle timer setting of a
+ UFS host controller. A value of '0' means auto-hibernate is not
+ enabled. Otherwise the value is the number of microseconds of
+ idle time before the UFS host controller will autonomously put
+ the link into hibernate state. That will save power at the
+ expense of increased latency. Note that the hardware supports
+ 10-bit values with a power-of-ten multiplier which allows a
+ maximum value of 102300000. Refer to the UFS Host Controller
+ Interface specification for more details.
+
What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/device_type
Date: February 2018
Contact: Stanislav Nijnikov <[email protected]>
diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c
index 4ff9e0b7eba1..8d9332bb7d0c 100644
--- a/drivers/scsi/ufs/ufs-sysfs.c
+++ b/drivers/scsi/ufs/ufs-sysfs.c
@@ -3,6 +3,7 @@
#include <linux/err.h>
#include <linux/string.h>
+#include <linux/bitfield.h>
#include <asm/unaligned.h>
#include "ufs.h"
@@ -117,12 +118,86 @@ static ssize_t spm_target_link_state_show(struct device *dev,
ufs_pm_lvl_states[hba->spm_lvl].link_state));
}
+static void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit)
+{
+ unsigned long flags;
+
+ if (!(hba->capabilities & MASK_AUTO_HIBERN8_SUPPORT))
+ return;
+
+ spin_lock_irqsave(hba->host->host_lock, flags);
+ if (hba->ahit == ahit)
+ goto out_unlock;
+ hba->ahit = ahit;
+ if (!pm_runtime_suspended(hba->dev))
+ ufshcd_writel(hba, hba->ahit, REG_AUTO_HIBERNATE_IDLE_TIMER);
+out_unlock:
+ spin_unlock_irqrestore(hba->host->host_lock, flags);
+}
+
+/* Convert Auto-Hibernate Idle Timer register value to microseconds */
+static int ufshcd_ahit_to_us(u32 ahit)
+{
+ int timer = FIELD_GET(UFSHCI_AHIBERN8_TIMER_MASK, ahit);
+ int scale = FIELD_GET(UFSHCI_AHIBERN8_SCALE_MASK, ahit);
+
+ for (; scale > 0; --scale)
+ timer *= UFSHCI_AHIBERN8_SCALE_FACTOR;
+
+ return timer;
+}
+
+/* Convert microseconds to Auto-Hibernate Idle Timer register value */
+static u32 ufshcd_us_to_ahit(unsigned int timer)
+{
+ unsigned int scale;
+
+ for (scale = 0; timer > UFSHCI_AHIBERN8_TIMER_MASK; ++scale)
+ timer /= UFSHCI_AHIBERN8_SCALE_FACTOR;
+
+ return FIELD_PREP(UFSHCI_AHIBERN8_TIMER_MASK, timer) |
+ FIELD_PREP(UFSHCI_AHIBERN8_SCALE_MASK, scale);
+}
+
+static ssize_t auto_hibern8_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ if (!(hba->capabilities & MASK_AUTO_HIBERN8_SUPPORT))
+ return -EOPNOTSUPP;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", ufshcd_ahit_to_us(hba->ahit));
+}
+
+static ssize_t auto_hibern8_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+ unsigned int timer;
+
+ if (!(hba->capabilities & MASK_AUTO_HIBERN8_SUPPORT))
+ return -EOPNOTSUPP;
+
+ if (kstrtouint(buf, 0, &timer))
+ return -EINVAL;
+
+ if (timer > UFSHCI_AHIBERN8_MAX)
+ return -EINVAL;
+
+ ufshcd_auto_hibern8_update(hba, ufshcd_us_to_ahit(timer));
+
+ return count;
+}
+
static DEVICE_ATTR_RW(rpm_lvl);
static DEVICE_ATTR_RO(rpm_target_dev_state);
static DEVICE_ATTR_RO(rpm_target_link_state);
static DEVICE_ATTR_RW(spm_lvl);
static DEVICE_ATTR_RO(spm_target_dev_state);
static DEVICE_ATTR_RO(spm_target_link_state);
+static DEVICE_ATTR_RW(auto_hibern8);
static struct attribute *ufs_sysfs_ufshcd_attrs[] = {
&dev_attr_rpm_lvl.attr,
@@ -131,6 +206,7 @@ static ssize_t spm_target_link_state_show(struct device *dev,
&dev_attr_spm_lvl.attr,
&dev_attr_spm_target_dev_state.attr,
&dev_attr_spm_target_link_state.attr,
+ &dev_attr_auto_hibern8.attr,
NULL
};
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 3abcd31646eb..facee2b97926 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -41,6 +41,7 @@
#include <linux/devfreq.h>
#include <linux/nls.h>
#include <linux/of.h>
+#include <linux/bitfield.h>
#include "ufshcd.h"
#include "ufs_quirks.h"
#include "unipro.h"
@@ -3708,6 +3709,18 @@ static int ufshcd_uic_hibern8_exit(struct ufs_hba *hba)
return ret;
}
+static void ufshcd_auto_hibern8_enable(struct ufs_hba *hba)
+{
+ unsigned long flags;
+
+ if (!(hba->capabilities & MASK_AUTO_HIBERN8_SUPPORT) || !hba->ahit)
+ return;
+
+ spin_lock_irqsave(hba->host->host_lock, flags);
+ ufshcd_writel(hba, hba->ahit, REG_AUTO_HIBERNATE_IDLE_TIMER);
+ spin_unlock_irqrestore(hba->host->host_lock, flags);
+}
+
/**
* ufshcd_init_pwr_info - setting the POR (power on reset)
* values in hba power info
@@ -6307,6 +6320,9 @@ static int ufshcd_probe_hba(struct ufs_hba *hba)
/* UniPro link is active now */
ufshcd_set_link_active(hba);
+ /* Enable Auto-Hibernate if configured */
+ ufshcd_auto_hibern8_enable(hba);
+
ret = ufshcd_verify_dev_init(hba);
if (ret)
goto out;
@@ -7391,6 +7407,10 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
/* Schedule clock gating in case of no access to UFS device yet */
ufshcd_release(hba);
+
+ /* Enable Auto-Hibernate if configured */
+ ufshcd_auto_hibern8_enable(hba);
+
goto out;
set_old_link_state:
@@ -7834,6 +7854,12 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
UFS_SLEEP_PWR_MODE,
UIC_LINK_HIBERN8_STATE);
+ /* Set the default auto-hiberate idle timer value to 150 ms */
+ if (hba->capabilities & MASK_AUTO_HIBERN8_SUPPORT) {
+ hba->ahit = FIELD_PREP(UFSHCI_AHIBERN8_TIMER_MASK, 150) |
+ FIELD_PREP(UFSHCI_AHIBERN8_SCALE_MASK, 3);
+ }
+
/* Hold auto suspend until async scan completes */
pm_runtime_get_sync(dev);
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index deb3c5d382e9..8110dcd04d22 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -531,6 +531,9 @@ struct ufs_hba {
struct device_attribute spm_lvl_attr;
int pm_op_in_progress;
+ /* Auto-Hibernate Idle Timer register value */
+ u32 ahit;
+
struct ufshcd_lrb *lrb;
unsigned long lrb_in_use;
diff --git a/drivers/scsi/ufs/ufshci.h b/drivers/scsi/ufs/ufshci.h
index 1a1b5d9fe514..bb5d9c7f3353 100644
--- a/drivers/scsi/ufs/ufshci.h
+++ b/drivers/scsi/ufs/ufshci.h
@@ -86,6 +86,7 @@ enum {
enum {
MASK_TRANSFER_REQUESTS_SLOTS = 0x0000001F,
MASK_TASK_MANAGEMENT_REQUEST_SLOTS = 0x00070000,
+ MASK_AUTO_HIBERN8_SUPPORT = 0x00800000,
MASK_64_ADDRESSING_SUPPORT = 0x01000000,
MASK_OUT_OF_ORDER_DATA_DELIVERY_SUPPORT = 0x02000000,
MASK_UIC_DME_TEST_MODE_SUPPORT = 0x04000000,
@@ -119,6 +120,12 @@ enum {
#define MANUFACTURE_ID_MASK UFS_MASK(0xFFFF, 0)
#define PRODUCT_ID_MASK UFS_MASK(0xFFFF, 16)
+/* AHIT - Auto-Hibernate Idle Timer */
+#define UFSHCI_AHIBERN8_TIMER_MASK GENMASK(9, 0)
+#define UFSHCI_AHIBERN8_SCALE_MASK GENMASK(12, 10)
+#define UFSHCI_AHIBERN8_SCALE_FACTOR 10
+#define UFSHCI_AHIBERN8_MAX (1023 * 100000)
+
/*
* IS - Interrupt Status - 20h
*/
--
1.9.1
> -----Original Message-----
> From: Adrian Hunter [mailto:[email protected]]
> Sent: Tuesday, March 20, 2018 3:08 PM
> To: Vinayak Holikatti <[email protected]>; Martin K. Petersen
> <[email protected]>; James E.J. Bottomley
> <[email protected]>
> Cc: Stanislav Nijnikov <[email protected]>; Jaegeuk Kim
> <[email protected]>; Bart Van Assche <[email protected]>; linux-
> [email protected]; [email protected]; Szymon Mielczarek
> <[email protected]>; Alim Akhtar
> <[email protected]>; Alex Lemberg <[email protected]>;
> Vivek Gautam <[email protected]>
> Subject: [PATCH V3 1/1] scsi: ufs: Add support for Auto-Hibernate Idle Timer
>
> UFS host controllers may support an autonomous power management
> feature called the Auto-Hibernate Idle Timer. The timer is set to the number
> of microseconds of idle time before the UFS host controller will
> autonomously put the link into Hibernate state. That will save power at the
> expense of increased latency. Any access to the host controller interface
> registers will automatically put the link out of Hibernate state. So once
> configured, the feature is transparent to the driver.
>
> Expose the Auto-Hibernate Idle Timer value via SysFS to allow users to
> choose between power efficiency or lower latency. Set a default value of
> 150 ms.
>
> Signed-off-by: Adrian Hunter <[email protected]>
Acked-by: Stanislav Nijnikov <[email protected]>
> ---
> Documentation/ABI/testing/sysfs-driver-ufs | 14 ++++++
> drivers/scsi/ufs/ufs-sysfs.c | 76
> ++++++++++++++++++++++++++++++
> drivers/scsi/ufs/ufshcd.c | 26 ++++++++++
> drivers/scsi/ufs/ufshcd.h | 3 ++
> drivers/scsi/ufs/ufshci.h | 7 +++
> 5 files changed, 126 insertions(+)
>
> diff --git a/Documentation/ABI/testing/sysfs-driver-ufs
> b/Documentation/ABI/testing/sysfs-driver-ufs
> index 83735f79e572..016724ec26d5 100644
> --- a/Documentation/ABI/testing/sysfs-driver-ufs
> +++ b/Documentation/ABI/testing/sysfs-driver-ufs
> @@ -1,3 +1,17 @@
> +What: /sys/bus/*/drivers/ufshcd/*/auto_hibern8
> +Date: March 2018
> +Contact: [email protected]
> +Description:
> + This file contains the auto-hibernate idle timer setting of a
> + UFS host controller. A value of '0' means auto-hibernate is
> not
> + enabled. Otherwise the value is the number of microseconds
> of
> + idle time before the UFS host controller will autonomously
> put
> + the link into hibernate state. That will save power at the
> + expense of increased latency. Note that the hardware
> supports
> + 10-bit values with a power-of-ten multiplier which allows a
> + maximum value of 102300000. Refer to the UFS Host
> Controller
> + Interface specification for more details.
> +
> What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/device_type
> Date: February 2018
> Contact: Stanislav Nijnikov <[email protected]>
> diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c index
> 4ff9e0b7eba1..8d9332bb7d0c 100644
> --- a/drivers/scsi/ufs/ufs-sysfs.c
> +++ b/drivers/scsi/ufs/ufs-sysfs.c
> @@ -3,6 +3,7 @@
>
> #include <linux/err.h>
> #include <linux/string.h>
> +#include <linux/bitfield.h>
> #include <asm/unaligned.h>
>
> #include "ufs.h"
> @@ -117,12 +118,86 @@ static ssize_t spm_target_link_state_show(struct
> device *dev,
> ufs_pm_lvl_states[hba-
> >spm_lvl].link_state));
> }
>
> +static void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit) {
> + unsigned long flags;
> +
> + if (!(hba->capabilities & MASK_AUTO_HIBERN8_SUPPORT))
> + return;
> +
> + spin_lock_irqsave(hba->host->host_lock, flags);
> + if (hba->ahit == ahit)
> + goto out_unlock;
> + hba->ahit = ahit;
> + if (!pm_runtime_suspended(hba->dev))
> + ufshcd_writel(hba, hba->ahit,
> REG_AUTO_HIBERNATE_IDLE_TIMER);
> +out_unlock:
> + spin_unlock_irqrestore(hba->host->host_lock, flags); }
> +
> +/* Convert Auto-Hibernate Idle Timer register value to microseconds */
> +static int ufshcd_ahit_to_us(u32 ahit) {
> + int timer = FIELD_GET(UFSHCI_AHIBERN8_TIMER_MASK, ahit);
> + int scale = FIELD_GET(UFSHCI_AHIBERN8_SCALE_MASK, ahit);
> +
> + for (; scale > 0; --scale)
> + timer *= UFSHCI_AHIBERN8_SCALE_FACTOR;
> +
> + return timer;
> +}
> +
> +/* Convert microseconds to Auto-Hibernate Idle Timer register value */
> +static u32 ufshcd_us_to_ahit(unsigned int timer) {
> + unsigned int scale;
> +
> + for (scale = 0; timer > UFSHCI_AHIBERN8_TIMER_MASK; ++scale)
> + timer /= UFSHCI_AHIBERN8_SCALE_FACTOR;
> +
> + return FIELD_PREP(UFSHCI_AHIBERN8_TIMER_MASK, timer) |
> + FIELD_PREP(UFSHCI_AHIBERN8_SCALE_MASK, scale); }
> +
> +static ssize_t auto_hibern8_show(struct device *dev,
> + struct device_attribute *attr, char *buf) {
> + struct ufs_hba *hba = dev_get_drvdata(dev);
> +
> + if (!(hba->capabilities & MASK_AUTO_HIBERN8_SUPPORT))
> + return -EOPNOTSUPP;
> +
> + return snprintf(buf, PAGE_SIZE, "%d\n", ufshcd_ahit_to_us(hba-
> >ahit));
> +}
> +
> +static ssize_t auto_hibern8_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + struct ufs_hba *hba = dev_get_drvdata(dev);
> + unsigned int timer;
> +
> + if (!(hba->capabilities & MASK_AUTO_HIBERN8_SUPPORT))
> + return -EOPNOTSUPP;
> +
> + if (kstrtouint(buf, 0, &timer))
> + return -EINVAL;
> +
> + if (timer > UFSHCI_AHIBERN8_MAX)
> + return -EINVAL;
> +
> + ufshcd_auto_hibern8_update(hba, ufshcd_us_to_ahit(timer));
> +
> + return count;
> +}
> +
> static DEVICE_ATTR_RW(rpm_lvl);
> static DEVICE_ATTR_RO(rpm_target_dev_state);
> static DEVICE_ATTR_RO(rpm_target_link_state);
> static DEVICE_ATTR_RW(spm_lvl);
> static DEVICE_ATTR_RO(spm_target_dev_state);
> static DEVICE_ATTR_RO(spm_target_link_state);
> +static DEVICE_ATTR_RW(auto_hibern8);
>
> static struct attribute *ufs_sysfs_ufshcd_attrs[] = {
> &dev_attr_rpm_lvl.attr,
> @@ -131,6 +206,7 @@ static ssize_t spm_target_link_state_show(struct
> device *dev,
> &dev_attr_spm_lvl.attr,
> &dev_attr_spm_target_dev_state.attr,
> &dev_attr_spm_target_link_state.attr,
> + &dev_attr_auto_hibern8.attr,
> NULL
> };
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index
> 3abcd31646eb..facee2b97926 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -41,6 +41,7 @@
> #include <linux/devfreq.h>
> #include <linux/nls.h>
> #include <linux/of.h>
> +#include <linux/bitfield.h>
> #include "ufshcd.h"
> #include "ufs_quirks.h"
> #include "unipro.h"
> @@ -3708,6 +3709,18 @@ static int ufshcd_uic_hibern8_exit(struct ufs_hba
> *hba)
> return ret;
> }
>
> +static void ufshcd_auto_hibern8_enable(struct ufs_hba *hba) {
> + unsigned long flags;
> +
> + if (!(hba->capabilities & MASK_AUTO_HIBERN8_SUPPORT) || !hba-
> >ahit)
> + return;
> +
> + spin_lock_irqsave(hba->host->host_lock, flags);
> + ufshcd_writel(hba, hba->ahit, REG_AUTO_HIBERNATE_IDLE_TIMER);
> + spin_unlock_irqrestore(hba->host->host_lock, flags); }
> +
> /**
> * ufshcd_init_pwr_info - setting the POR (power on reset)
> * values in hba power info
> @@ -6307,6 +6320,9 @@ static int ufshcd_probe_hba(struct ufs_hba *hba)
> /* UniPro link is active now */
> ufshcd_set_link_active(hba);
>
> + /* Enable Auto-Hibernate if configured */
> + ufshcd_auto_hibern8_enable(hba);
> +
> ret = ufshcd_verify_dev_init(hba);
> if (ret)
> goto out;
> @@ -7391,6 +7407,10 @@ static int ufshcd_resume(struct ufs_hba *hba,
> enum ufs_pm_op pm_op)
>
> /* Schedule clock gating in case of no access to UFS device yet */
> ufshcd_release(hba);
> +
> + /* Enable Auto-Hibernate if configured */
> + ufshcd_auto_hibern8_enable(hba);
> +
> goto out;
>
> set_old_link_state:
> @@ -7834,6 +7854,12 @@ int ufshcd_init(struct ufs_hba *hba, void
> __iomem *mmio_base, unsigned int irq)
> UFS_SLEEP_PWR_MODE,
> UIC_LINK_HIBERN8_STATE);
>
> + /* Set the default auto-hiberate idle timer value to 150 ms */
> + if (hba->capabilities & MASK_AUTO_HIBERN8_SUPPORT) {
> + hba->ahit = FIELD_PREP(UFSHCI_AHIBERN8_TIMER_MASK,
> 150) |
> + FIELD_PREP(UFSHCI_AHIBERN8_SCALE_MASK, 3);
> + }
> +
> /* Hold auto suspend until async scan completes */
> pm_runtime_get_sync(dev);
>
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index
> deb3c5d382e9..8110dcd04d22 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -531,6 +531,9 @@ struct ufs_hba {
> struct device_attribute spm_lvl_attr;
> int pm_op_in_progress;
>
> + /* Auto-Hibernate Idle Timer register value */
> + u32 ahit;
> +
> struct ufshcd_lrb *lrb;
> unsigned long lrb_in_use;
>
> diff --git a/drivers/scsi/ufs/ufshci.h b/drivers/scsi/ufs/ufshci.h index
> 1a1b5d9fe514..bb5d9c7f3353 100644
> --- a/drivers/scsi/ufs/ufshci.h
> +++ b/drivers/scsi/ufs/ufshci.h
> @@ -86,6 +86,7 @@ enum {
> enum {
> MASK_TRANSFER_REQUESTS_SLOTS = 0x0000001F,
> MASK_TASK_MANAGEMENT_REQUEST_SLOTS = 0x00070000,
> + MASK_AUTO_HIBERN8_SUPPORT = 0x00800000,
> MASK_64_ADDRESSING_SUPPORT = 0x01000000,
> MASK_OUT_OF_ORDER_DATA_DELIVERY_SUPPORT = 0x02000000,
> MASK_UIC_DME_TEST_MODE_SUPPORT = 0x04000000,
> @@ -119,6 +120,12 @@ enum {
> #define MANUFACTURE_ID_MASK UFS_MASK(0xFFFF, 0)
> #define PRODUCT_ID_MASK UFS_MASK(0xFFFF, 16)
>
> +/* AHIT - Auto-Hibernate Idle Timer */
> +#define UFSHCI_AHIBERN8_TIMER_MASK GENMASK(9, 0)
> +#define UFSHCI_AHIBERN8_SCALE_MASK GENMASK(12, 10)
> +#define UFSHCI_AHIBERN8_SCALE_FACTOR 10
> +#define UFSHCI_AHIBERN8_MAX (1023 * 100000)
> +
> /*
> * IS - Interrupt Status - 20h
> */
> --
> 1.9.1
Adrian,
> Here is V3, now re-based on top of patch "scsi: ufs: sysfs:reworking of the
> rpm_lvl and spm_lvl entries".
>
> Michał Potomski has previously sent a patch for Auto-Hibernate, but this
> patch is slightly different, based on the latest ufs-sysfs changes, it also
> takes care to restore auto-hibernate during resume, and otherwise avoids
> updating the register if the device is runtime suspended. Also a default
> value of 150ms is set.
Applied to 4.17/scsi-queue. Thank you!
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Martin K. Petersen Oracle Linux Engineering