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scsi: ufs-qcom: Fix ufs RST_n spec violation 

According to the spec (JESD220E chapter 7.2), while powering off/on the ufs
device, RST_n signal should be between VSS(Ground) and VCCQ/VCCQ2.

Link: https://lore.kernel.org/r/1610103385-45755-3-git-send-email-ziqichen@codeaurora.org
Acked-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Ziqi Chen <ziqichen@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Ziqi Chen 2021-01-08 18:56:25 +08:00 committed by Martin K. Petersen
parent 528db9e563
commit b61d041413
1 changed files with 16 additions and 2 deletions
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18
drivers/scsi/ufs/ufs-qcom.c
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@ -568,6 +568,17 @@ out:
return err;
}
static void ufs_qcom_device_reset_ctrl(struct ufs_hba *hba, bool asserted)
{
struct ufs_qcom_host *host = ufshcd_get_variant(hba);
/* reset gpio is optional */
if (!host->device_reset)
return;
gpiod_set_value_cansleep(host->device_reset, asserted);
}
static int ufs_qcom_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
{
struct ufs_qcom_host *host = ufshcd_get_variant(hba);
@ -582,6 +593,9 @@ static int ufs_qcom_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
ufs_qcom_disable_lane_clks(host);
phy_power_off(phy);
/* reset the connected UFS device during power down */
ufs_qcom_device_reset_ctrl(hba, true);
} else if (!ufs_qcom_is_link_active(hba)) {
ufs_qcom_disable_lane_clks(host);
}
@ -1421,10 +1435,10 @@ static int ufs_qcom_device_reset(struct ufs_hba *hba)
* The UFS device shall detect reset pulses of 1us, sleep for 10us to
* be on the safe side.
*/
gpiod_set_value_cansleep(host->device_reset, 1);
ufs_qcom_device_reset_ctrl(hba, true);
usleep_range(10, 15);
gpiod_set_value_cansleep(host->device_reset, 0);
ufs_qcom_device_reset_ctrl(hba, false);
usleep_range(10, 15);
return 0;