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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.c49
1 files changed, 18 insertions, 31 deletions
diff --git a/drivers/usb/host/whci/pzl.c b/drivers/usb/host/whci/pzl.c
index 8d62df0c330..2ae5abf69a6 100644
--- a/drivers/usb/host/whci/pzl.c
+++ b/drivers/usb/host/whci/pzl.c
@@ -19,35 +19,11 @@
#include <linux/dma-mapping.h>
#include <linux/uwb/umc.h>
#include <linux/usb.h>
-#define D_LOCAL 0
-#include <linux/uwb/debug.h>
#include "../../wusbcore/wusbhc.h"
#include "whcd.h"
-#if D_LOCAL >= 4
-static void dump_pzl(struct whc *whc, const char *tag)
-{
- struct device *dev = &whc->umc->dev;
- struct whc_qset *qset;
- int period = 0;
-
- d_printf(4, dev, "PZL %s\n", tag);
-
- for (period = 0; period < 5; period++) {
- d_printf(4, dev, "Period %d\n", period);
- list_for_each_entry(qset, &whc->periodic_list[period], list_node) {
- dump_qset(qset, dev);
- }
- }
-}
-#else
-static inline void dump_pzl(struct whc *whc, const char *tag)
-{
-}
-#endif
-
static void update_pzl_pointers(struct whc *whc, int period, u64 addr)
{
switch (period) {
@@ -195,11 +171,26 @@ 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)
@@ -235,8 +226,6 @@ void scan_periodic_work(struct work_struct *work)
spin_lock_irq(&whc->lock);
- dump_pzl(whc, "before processing");
-
for (period = 4; period >= 0; period--) {
list_for_each_entry_safe(qset, t, &whc->periodic_list[period], list_node) {
if (!qset->in_hw_list)
@@ -248,8 +237,6 @@ void scan_periodic_work(struct work_struct *work)
if (update & (WHC_UPDATE_ADDED | WHC_UPDATE_REMOVED))
update_pzl_hw_view(whc);
- dump_pzl(whc, "after processing");
-
spin_unlock_irq(&whc->lock);
if (update) {