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Subject[PATCH 2/6] scsi: ufs: clear UAC for FFU
Date
From: Jaegeuk Kim <jaegeuk@google.com>

In order to conduct FFU or RPMB operations, UFS needs to clear UAC. This patch
clears it explicitly, so that we could get no failure given early execution.

Cc: Alim Akhtar <alim.akhtar@samsung.com>
Cc: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
---
drivers/scsi/ufs/ufshcd.c | 41 +++++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index d929c3d1e58cc..5deba03a61f75 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -7385,6 +7385,45 @@ static int ufshcd_add_lus(struct ufs_hba *hba)
return ret;
}

+static int
+ufshcd_send_request_sense(struct ufs_hba *hba, struct scsi_device *sdp);
+
+static int ufshcd_clear_uac(struct ufs_hba *hba)
+{
+ struct scsi_device *sdp;
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(hba->host->host_lock, flags);
+ sdp = hba->sdev_ufs_device;
+ if (sdp) {
+ ret = scsi_device_get(sdp);
+ if (!ret && !scsi_device_online(sdp)) {
+ ret = -ENODEV;
+ scsi_device_put(sdp);
+ }
+ } else {
+ ret = -ENODEV;
+ }
+ spin_unlock_irqrestore(hba->host->host_lock, flags);
+ if (ret)
+ goto out_err;
+
+ if (hba->wlun_dev_clr_ua) {
+ ret = ufshcd_send_request_sense(hba, sdp);
+ if (ret)
+ goto out;
+ /* Unit attention condition is cleared now */
+ hba->wlun_dev_clr_ua = false;
+ }
+out:
+ scsi_device_put(sdp);
+out_err:
+ if (ret)
+ dev_err(hba->dev, "%s: Failed UAC clear ret = %d\n", __func__, ret);
+ return ret;
+}
+
/**
* ufshcd_probe_hba - probe hba to detect device and initialize
* @hba: per-adapter instance
@@ -7500,6 +7539,8 @@ static void ufshcd_async_scan(void *data, async_cookie_t cookie)
pm_runtime_put_sync(hba->dev);
ufshcd_exit_clk_scaling(hba);
ufshcd_hba_exit(hba);
+ } else {
+ ufshcd_clear_uac(hba);
}
}

--
2.28.0.618.gf4bc123cb7-goog
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