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scsi: ufs: skip devoting device ref_clk during clock gating

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Voting/devoting device ref_clk source could be time consuming hence add
support to allow ufs variant to decide if it wants to control ref_clk
during aggressive clock gating or not. This clock should still be gated
off during runtime/system suspend.

Change-Id: Ibec8cc8b3689ff4e2418039e74dbf311e589157e
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
This commit is contained in:
Subhash Jadavani 2015-07-13 18:44:06 -07:00 • committed by David Keitel
parent ec66dacb42
commit 029a8b38f6
3 changed files with 11 additions and 1 deletions
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7
drivers/scsi/ufs/ufs-qcom.c
View file

@ -1720,6 +1720,13 @@ static int ufs_qcom_init(struct ufs_hba *hba)
host->hba = hba;
ufshcd_set_variant(hba, host);
/*
* voting/devoting device ref_clk source is time consuming hence
* skip devoting it during aggressive clock gating. This clock
* will still be gated off during runtime suspend.
*/
hba->no_ref_clk_gating = true;
err = ufs_qcom_ice_get_dev(host);
if (err == -EPROBE_DEFER) {
/*

2
drivers/scsi/ufs/ufshcd.c
View file

@ -1270,7 +1270,7 @@ static void ufshcd_gate_work(struct work_struct *work)
ufshcd_suspend_clkscaling(hba);
if (!ufshcd_is_link_active(hba))
if (!ufshcd_is_link_active(hba) && !hba->no_ref_clk_gating)
ufshcd_setup_clocks(hba, false);
else
/* If link is active, device ref_clk can't be switched off */

3
drivers/scsi/ufs/ufshcd.h
View file

@ -841,6 +841,9 @@ struct ufs_hba {
bool is_urgent_bkops_lvl_checked;
struct rw_semaphore clk_scaling_lock;
/* If set, don't gate device ref_clk during clock gating */
bool no_ref_clk_gating;
};
/* Returns true if clocks can be gated. Otherwise false */