evie/android_kernel_oneplus_msm8998
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

scsi: ufs-qcom: update delay between assert/deassert in full reset

Browse source 
The hardware requirement for delay between assert/deassert
is at least 3-4 sleep clock (32.7KHz) cycles, which comes to
~125us (4/32768). To be on the safe side add 200us delay.

Change-Id: Ib9d27fe7bbf6107b1249b3719f63efdbff4b3795
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
This commit is contained in:
Venkat Gopalakrishnan 2016-11-01 17:01:20 -07:00 • committed by Subhash Jadavani
parent 51ab99448d
commit 6a714c1bf8
1 changed files with 6 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
drivers/scsi/ufs/ufs-qcom.c
View file

@ -791,8 +791,12 @@ static int ufs_qcom_full_reset(struct ufs_hba *hba)
goto out;
}
/* Very small delay, per the documented requirement */
usleep_range(1, 2);
/*
* The hardware requirement for delay between assert/deassert
* is at least 3-4 sleep clock (32.7KHz) cycles, which comes to
* ~125us (4/32768). To be on the safe side add 200us delay.
*/
usleep_range(200, 210);
ret = reset_control_deassert(hba->core_reset);
if (ret)