Hi Can,

On Wed, 2020-02-19 at 10:35 +0800, Can Guo wrote:

Since we all need this delay here, how about put the delay in the
entrence of ufshcd_setup_clocks(), before vops_setup_clocks()?
If so, we can remove all the delays we added in our vops since the
delay anyways delays everything inside ufshcd_setup_clocks().

Always putting the delay in the entrance of ufshcd_setup_clocks() may
add unwanted delay for vendors, just like your current implementation,
or some other vendors who do not want to disable the reference clock.

I think current patch is more reasonable because the delay is applied to
clock only named as "ref_clk" specifically.

If you needs to keep "ref_clk" in DT, would you consider to remove the
delay in your ufs_qcom_dev_ref_clk_ctrl() and let the delay happens via
common ufshcd_setup_clocks() only? However you may still need delay if
call path comes from ufs_qcom_pwr_change_notify().

What do you think?

Meanwhile, if you want to modify the delay
(hba->dev_info.clk_gating_wait_us) for some reasons, say for specific
UFS devices, you still can do it in vops_apply_dev_quirks().

What do you say?

Thanks,
Can Guo.

Thanks,
Stanley Chu

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