diff options
| author |   Subhash Jadavani <subhashj@codeaurora.org> | 2014-09-25 15:32:35 +0300 |
|---|---|---|
| committer |   Christoph Hellwig <hch@lst.de> | 2014-10-01 13:11:26 +0200 |
| commit | 374a246e4ebda1fc55d537877bf2412e511ecc7b (patch) | |
| tree | 548b471cadaaa8580276d2725bbafb55fae80b6e /drivers/scsi/ufs/ufshcd.c | |
| parent | ufs: Add support for clock scaling using devfreq framework (diff) | |
| download | linux-dev-374a246e4ebda1fc55d537877bf2412e511ecc7b.tar.xz linux-dev-374a246e4ebda1fc55d537877bf2412e511ecc7b.zip | |
ufs: tune bkops while power managment events
Add capability to control the auto bkops during suspend.
If host explicitly enables the auto bkops (background operation) on device
then only device would perform the bkops on its own. If auto bkops is not
enabled explicitly and if the device reaches to state where it must do
background operation, device would raise the urgent bkops exception event
to host and then host will enable the auto bkops on device. This patch
adds the option to choose whether auto bkops should be enabled during
runtime suspend or not. Since we don't want to keep the device active to
perform the non critical bkops, host will enable urgent bkops only.
Keep auto-bkops enabled after resume if urgent bkops needed.
If device bkops status shows that its in critical need of executing
background operations, host should allow the device to continue doing
background operations.
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Dolev Raviv <draviv@codeaurora.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/scsi/ufs/ufshcd.c')
| -rw-r--r-- | drivers/scsi/ufs/ufshcd.c | 26 |
1 files changed, 18 insertions, 8 deletions
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index df525e3b2c19..3a2de56fe080 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -4884,13 +4884,19 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) } if (ufshcd_is_runtime_pm(pm_op)) { - /* - * The device is idle with no requests in the queue, - * allow background operations if needed. - */ - ret = ufshcd_bkops_ctrl(hba, BKOPS_STATUS_NON_CRITICAL); - if (ret) - goto enable_gating; + if (ufshcd_can_autobkops_during_suspend(hba)) { + /* + * The device is idle with no requests in the queue, + * allow background operations if bkops status shows + * that performance might be impacted. + */ + ret = ufshcd_urgent_bkops(hba); + if (ret) + goto enable_gating; + } else { + /* make sure that auto bkops is disabled */ + ufshcd_disable_auto_bkops(hba); + } } if ((req_dev_pwr_mode != hba->curr_dev_pwr_mode) && @@ -5038,7 +5044,11 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) goto set_old_link_state; } - ufshcd_disable_auto_bkops(hba); + /* + * 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; if (ufshcd_is_clkscaling_enabled(hba)) |