[PATCH v1 1/1] spi: Enable tracing of the SPI setup CS selection

[Andy Shevchenko]

It is helpful to see what state of CS signal was during one
or another SPI operation. All the same for SPI setup.

Enable tracing of the SPI setup and CS selection.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
 drivers/spi/spi.c          |  4 +++
 include/trace/events/spi.h | 57 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 57120dea3273..ff719c1d93f5 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -804,6 +804,8 @@ static void spi_set_cs(struct spi_device *spi, bool enable, bool force)
 	    (spi->controller->last_cs_mode_high == (spi->mode & SPI_CS_HIGH)))
 		return;
 
+	trace_spi_set_cs(spi, activate);
+
 	spi->controller->last_cs_enable = enable;
 	spi->controller->last_cs_mode_high = spi->mode & SPI_CS_HIGH;
 
@@ -3457,6 +3459,8 @@ int spi_setup(struct spi_device *spi)
 		spi_set_thread_rt(spi->controller);
 	}
 
+	trace_spi_setup(spi, status);
+
 	dev_dbg(&spi->dev, "setup mode %lu, %s%s%s%s%u bits/w, %u Hz max --> %d\n",
 			spi->mode & SPI_MODE_X_MASK,
 			(spi->mode & SPI_CS_HIGH) ? "cs_high, " : "",
diff --git a/include/trace/events/spi.h b/include/trace/events/spi.h
index 0dd9171d2ad8..c0d9844befd7 100644
--- a/include/trace/events/spi.h
+++ b/include/trace/events/spi.h
@@ -42,6 +42,63 @@ DEFINE_EVENT(spi_controller, spi_controller_busy,
 
 );
 
+TRACE_EVENT(spi_setup,
+	TP_PROTO(struct spi_device *spi, int status),
+	TP_ARGS(spi, status),
+
+	TP_STRUCT__entry(
+		__field(int, bus_num)
+		__field(int, chip_select)
+		__field(unsigned long, mode)
+		__field(unsigned int, bits_per_word)
+		__field(unsigned int, max_speed_hz)
+		__field(int, status)
+	),
+
+	TP_fast_assign(
+		__entry->bus_num = spi->controller->bus_num;
+		__entry->chip_select = spi->chip_select;
+		__entry->mode = spi->mode;
+		__entry->bits_per_word = spi->bits_per_word;
+		__entry->max_speed_hz = spi->max_speed_hz;
+		__entry->status = status;
+	),
+
+	TP_printk("spi%d.%d setup mode %lu, %s%s%s%s%u bits/w, %u Hz max --> %d",
+		  __entry->bus_num, __entry->chip_select,
+		  (__entry->mode & SPI_MODE_X_MASK),
+		  (__entry->mode & SPI_CS_HIGH) ? "cs_high, " : "",
+		  (__entry->mode & SPI_LSB_FIRST) ? "lsb, " : "",
+		  (__entry->mode & SPI_3WIRE) ? "3wire, " : "",
+		  (__entry->mode & SPI_LOOP) ? "loopback, " : "",
+		  __entry->bits_per_word, __entry->max_speed_hz,
+		  __entry->status)
+);
+
+TRACE_EVENT(spi_set_cs,
+	TP_PROTO(struct spi_device *spi, bool enable),
+	TP_ARGS(spi, enable),
+
+	TP_STRUCT__entry(
+		__field(int, bus_num)
+		__field(int, chip_select)
+		__field(unsigned long, mode)
+		__field(bool, enable)
+	),
+
+	TP_fast_assign(
+		__entry->bus_num = spi->controller->bus_num;
+		__entry->chip_select = spi->chip_select;
+		__entry->mode = spi->mode;
+		__entry->enable = enable;
+	),
+
+	TP_printk("spi%d.%d %s%s",
+		  __entry->bus_num, __entry->chip_select,
+		  __entry->enable ? "activate" : "deactivate",
+		  (__entry->mode & SPI_CS_HIGH) ? ", cs_high" : "")
+);
+
 DECLARE_EVENT_CLASS(spi_message,
 
 	TP_PROTO(struct spi_message *msg),
-- 
2.30.2