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path: root/drivers/usb/host/whci/pzl.c
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Diffstat (limited to 'drivers/usb/host/whci/pzl.c')
-rw-r--r--drivers/usb/host/whci/pzl.c21
1 files changed, 18 insertions, 3 deletions
diff --git a/drivers/usb/host/whci/pzl.c b/drivers/usb/host/whci/pzl.c
index 8d62df0c330..34d3a0aeab2 100644
--- a/drivers/usb/host/whci/pzl.c
+++ b/drivers/usb/host/whci/pzl.c
@@ -195,11 +195,26 @@ void pzl_stop(struct whc *whc)
1000, "stop PZL");
}
+/**
+ * pzl_update - request a PZL update and wait for the hardware to be synced
+ * @whc: the WHCI HC
+ * @wusbcmd: WUSBCMD value to start the update.
+ *
+ * If the WUSB HC is inactive (i.e., the PZL is stopped) then the
+ * update must be skipped as the hardware may not respond to update
+ * requests.
+ */
void pzl_update(struct whc *whc, uint32_t wusbcmd)
{
- whc_write_wusbcmd(whc, wusbcmd, wusbcmd);
- wait_event(whc->periodic_list_wq,
- (le_readl(whc->base + WUSBCMD) & WUSBCMD_PERIODIC_UPDATED) == 0);
+ struct wusbhc *wusbhc = &whc->wusbhc;
+
+ mutex_lock(&wusbhc->mutex);
+ if (wusbhc->active) {
+ whc_write_wusbcmd(whc, wusbcmd, wusbcmd);
+ wait_event(whc->periodic_list_wq,
+ (le_readl(whc->base + WUSBCMD) & WUSBCMD_PERIODIC_UPDATED) == 0);
+ }
+ mutex_unlock(&wusbhc->mutex);
}
static void update_pzl_hw_view(struct whc *whc)