usb: dwc2: host: Add scheduler tracing

In preparation for future changes to the scheduler let's add some
tracing that makes it easy for us to see what's happening.  By default
this tracing will be off.

By changing "core.h" you can easily trace to ftrace, the console, or
nowhere.

Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
index 538cf38af0e4..18f9e4045643 100644
--- a/drivers/usb/dwc2/core.h
+++ b/drivers/usb/dwc2/core.h
@@ -44,6 +44,26 @@
 #include <linux/usb/phy.h>
 #include "hw.h"
 
+/*
+ * Suggested defines for tracers:
+ * - no_printk:    Disable tracing
+ * - pr_info:      Print this info to the console
+ * - trace_printk: Print this info to trace buffer (good for verbose logging)
+ */
+
+#define DWC2_TRACE_SCHEDULER		no_printk
+#define DWC2_TRACE_SCHEDULER_VB		no_printk
+
+/* Detailed scheduler tracing, but won't overwhelm console */
+#define dwc2_sch_dbg(hsotg, fmt, ...)					\
+	DWC2_TRACE_SCHEDULER(pr_fmt("%s: SCH: " fmt),			\
+			     dev_name(hsotg->dev), ##__VA_ARGS__)
+
+/* Verbose scheduler tracing */
+#define dwc2_sch_vdbg(hsotg, fmt, ...)					\
+	DWC2_TRACE_SCHEDULER_VB(pr_fmt("%s: SCH: " fmt),		\
+				dev_name(hsotg->dev), ##__VA_ARGS__)
+
 static inline u32 dwc2_readl(const void __iomem *addr)
 {
 	u32 value = __raw_readl(addr);