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Commit b2e8be93 authored by Subhash Jadavani's avatar Subhash Jadavani
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scsi: ufs: skip devoting device ref_clk during clock gating 



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: default avatarSubhash Jadavani <subhashj@codeaurora.org>
parent 403e3c04

drivers/scsi/ufs/ufs-qcom.c

+7 −0
Original line number Diff line number Diff line
@@ -1719,6 +1719,13 @@ static int ufs_qcom_init(struct ufs_hba *hba) 
	host->hba = hba;

	ufshcd_bind_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) {

		/*

drivers/scsi/ufs/ufshcd.c

+1 −1
Original line number Diff line number Diff line
@@ -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 */

drivers/scsi/ufs/ufshcd.h

+3 −0
Original line number Diff line number Diff line
@@ -840,6 +840,9 @@ 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 */