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scsi: ufs: add capability to keep auto bkops always enabled

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UFS device requires to perform bkops (back ground operations) periodically
but host can control (via auto-bkops parameter of device) when device can
perform bkops based on its performance requirements. In general, host
would like to enable the device's auto-bkops only when it's not doing any
regular data transfer but sometimes device may not behave properly if host
keeps the auto-bkops disabled. This change adds the capability to let the
device auto-bkops always enabled except suspend.

Change-Id: I92c4531f88cb75a563568270584926eb73b53c98
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
This commit is contained in:
Subhash Jadavani 2014-10-15 19:11:03 -07:00 • committed by David Keitel
parent 500f7e1f33
commit 9f06dddf5b
2 changed files with 35 additions and 11 deletions
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15
drivers/scsi/ufs/ufshcd.c
View file

@ -4352,18 +4352,25 @@ out:
}
/**
* ufshcd_force_reset_auto_bkops - force enable of auto bkops
* ufshcd_force_reset_auto_bkops - force reset auto bkops state
* @hba: per adapter instance
*
* After a device reset the device may toggle the BKOPS_EN flag
* to default value. The s/w tracking variables should be updated
* as well. Do this by forcing enable of auto bkops.
* as well. This function would change the auto-bkops state based on
* UFSHCD_CAP_KEEP_AUTO_BKOPS_ENABLED_EXCEPT_SUSPEND.
*/
static void ufshcd_force_reset_auto_bkops(struct ufs_hba *hba)
{
if (ufshcd_keep_autobkops_enabled_except_suspend(hba)) {
hba->auto_bkops_enabled = false;
hba->ee_ctrl_mask |= MASK_EE_URGENT_BKOPS;
ufshcd_enable_auto_bkops(hba);
} else {
hba->auto_bkops_enabled = true;
hba->ee_ctrl_mask &= ~MASK_EE_URGENT_BKOPS;
ufshcd_disable_auto_bkops(hba);
}
}
static inline int ufshcd_get_bkops_status(struct ufs_hba *hba, u32 *status)
@ -6602,11 +6609,15 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
goto set_old_link_state;
}
if (ufshcd_keep_autobkops_enabled_except_suspend(hba))
ufshcd_enable_auto_bkops(hba);
else
/*
* If BKOPs operations are urgently needed at this moment then
* keep auto-bkops enabled or else disable it.
*/
ufshcd_urgent_bkops(hba);
hba->clk_gating.is_suspended = false;
hba->hibern8_on_idle.is_suspended = false;

13
include/linux/scsi/ufs/ufshcd.h
View file

@ -647,6 +647,14 @@ struct ufs_hba {
#define UFSHCD_CAP_INTR_AGGR (1 << 4)
/* Allow standalone Hibern8 enter on idle */
#define UFSHCD_CAP_HIBERN8_ENTER_ON_IDLE (1 << 5)
/*
* This capability allows the device auto-bkops to be always enabled
* except during suspend (both runtime and suspend).
* Enabling this capability means that device will always be allowed
* to do background operation when it's active but it might degrade
* the performance of ongoing read/write operations.
*/
#define UFSHCD_CAP_KEEP_AUTO_BKOPS_ENABLED_EXCEPT_SUSPEND (1 << 5)
struct devfreq *devfreq;
struct ufs_clk_scaling clk_scaling;
@ -674,6 +682,11 @@ static inline bool ufshcd_is_hibern8_on_idle_allowed(struct ufs_hba *hba)
{
return hba->caps & UFSHCD_CAP_HIBERN8_ENTER_ON_IDLE;
}
static inline bool ufshcd_keep_autobkops_enabled_except_suspend(
struct ufs_hba *hba)
{
return hba->caps & UFSHCD_CAP_KEEP_AUTO_BKOPS_ENABLED_EXCEPT_SUSPEND;
}
static inline bool ufshcd_is_intr_aggr_allowed(struct ufs_hba *hba)
{